// SPDX-License-Identifier: GPL-2.0
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/*
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* Driver for STM32 Digital Camera Memory Interface
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*
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* Copyright (C) STMicroelectronics SA 2017
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* Authors: Yannick Fertre <yannick.fertre@st.com>
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* Hugues Fruchet <hugues.fruchet@st.com>
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* for STMicroelectronics.
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*
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* This driver is based on atmel_isi.c
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*
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*/
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#include <linux/clk.h>
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#include <linux/completion.h>
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#include <linux/delay.h>
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#include <linux/dmaengine.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/of_graph.h>
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#include <linux/pinctrl/consumer.h>
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#include <linux/platform_device.h>
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#include <linux/pm_runtime.h>
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#include <linux/reset.h>
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#include <linux/videodev2.h>
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#include <media/v4l2-ctrls.h>
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#include <media/v4l2-dev.h>
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#include <media/v4l2-device.h>
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#include <media/v4l2-event.h>
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#include <media/v4l2-fwnode.h>
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#include <media/v4l2-image-sizes.h>
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#include <media/v4l2-ioctl.h>
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#include <media/v4l2-rect.h>
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#include <media/videobuf2-dma-contig.h>
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#define DRV_NAME "stm32-dcmi"
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/* Registers offset for DCMI */
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#define DCMI_CR 0x00 /* Control Register */
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#define DCMI_SR 0x04 /* Status Register */
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#define DCMI_RIS 0x08 /* Raw Interrupt Status register */
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#define DCMI_IER 0x0C /* Interrupt Enable Register */
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#define DCMI_MIS 0x10 /* Masked Interrupt Status register */
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#define DCMI_ICR 0x14 /* Interrupt Clear Register */
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#define DCMI_ESCR 0x18 /* Embedded Synchronization Code Register */
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#define DCMI_ESUR 0x1C /* Embedded Synchronization Unmask Register */
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#define DCMI_CWSTRT 0x20 /* Crop Window STaRT */
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#define DCMI_CWSIZE 0x24 /* Crop Window SIZE */
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#define DCMI_DR 0x28 /* Data Register */
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#define DCMI_IDR 0x2C /* IDentifier Register */
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/* Bits definition for control register (DCMI_CR) */
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#define CR_CAPTURE BIT(0)
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#define CR_CM BIT(1)
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#define CR_CROP BIT(2)
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#define CR_JPEG BIT(3)
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#define CR_ESS BIT(4)
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#define CR_PCKPOL BIT(5)
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#define CR_HSPOL BIT(6)
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#define CR_VSPOL BIT(7)
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#define CR_FCRC_0 BIT(8)
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#define CR_FCRC_1 BIT(9)
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#define CR_EDM_0 BIT(10)
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#define CR_EDM_1 BIT(11)
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#define CR_ENABLE BIT(14)
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/* Bits definition for status register (DCMI_SR) */
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#define SR_HSYNC BIT(0)
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#define SR_VSYNC BIT(1)
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#define SR_FNE BIT(2)
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/*
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* Bits definition for interrupt registers
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* (DCMI_RIS, DCMI_IER, DCMI_MIS, DCMI_ICR)
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*/
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#define IT_FRAME BIT(0)
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#define IT_OVR BIT(1)
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#define IT_ERR BIT(2)
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#define IT_VSYNC BIT(3)
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#define IT_LINE BIT(4)
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enum state {
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STOPPED = 0,
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WAIT_FOR_BUFFER,
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RUNNING,
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};
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#define MIN_WIDTH 16U
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#define MAX_WIDTH 2592U
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#define MIN_HEIGHT 16U
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#define MAX_HEIGHT 2592U
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#define TIMEOUT_MS 1000
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#define OVERRUN_ERROR_THRESHOLD 3
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struct dcmi_graph_entity {
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struct v4l2_async_subdev asd;
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struct device_node *remote_node;
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struct v4l2_subdev *source;
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};
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struct dcmi_format {
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u32 fourcc;
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u32 mbus_code;
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u8 bpp;
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};
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struct dcmi_framesize {
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u32 width;
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u32 height;
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};
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struct dcmi_buf {
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struct vb2_v4l2_buffer vb;
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bool prepared;
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dma_addr_t paddr;
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size_t size;
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struct list_head list;
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};
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struct stm32_dcmi {
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/* Protects the access of variables shared within the interrupt */
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spinlock_t irqlock;
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struct device *dev;
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void __iomem *regs;
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struct resource *res;
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struct reset_control *rstc;
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int sequence;
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struct list_head buffers;
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struct dcmi_buf *active;
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int irq;
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struct v4l2_device v4l2_dev;
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struct video_device *vdev;
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struct v4l2_async_notifier notifier;
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struct dcmi_graph_entity entity;
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struct v4l2_format fmt;
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struct v4l2_rect crop;
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bool do_crop;
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const struct dcmi_format **sd_formats;
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unsigned int num_of_sd_formats;
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const struct dcmi_format *sd_format;
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struct dcmi_framesize *sd_framesizes;
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unsigned int num_of_sd_framesizes;
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struct dcmi_framesize sd_framesize;
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struct v4l2_rect sd_bounds;
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/* Protect this data structure */
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struct mutex lock;
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struct vb2_queue queue;
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struct v4l2_fwnode_bus_parallel bus;
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struct completion complete;
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struct clk *mclk;
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enum state state;
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struct dma_chan *dma_chan;
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dma_cookie_t dma_cookie;
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u32 misr;
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int errors_count;
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int overrun_count;
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int buffers_count;
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/* Ensure DMA operations atomicity */
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struct mutex dma_lock;
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struct media_device mdev;
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struct media_pad vid_cap_pad;
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struct media_pipeline pipeline;
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};
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static inline struct stm32_dcmi *notifier_to_dcmi(struct v4l2_async_notifier *n)
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{
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return container_of(n, struct stm32_dcmi, notifier);
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}
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static inline u32 reg_read(void __iomem *base, u32 reg)
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{
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return readl_relaxed(base + reg);
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}
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static inline void reg_write(void __iomem *base, u32 reg, u32 val)
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{
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writel_relaxed(val, base + reg);
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}
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static inline void reg_set(void __iomem *base, u32 reg, u32 mask)
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{
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reg_write(base, reg, reg_read(base, reg) | mask);
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}
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static inline void reg_clear(void __iomem *base, u32 reg, u32 mask)
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{
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reg_write(base, reg, reg_read(base, reg) & ~mask);
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}
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static int dcmi_start_capture(struct stm32_dcmi *dcmi, struct dcmi_buf *buf);
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static void dcmi_buffer_done(struct stm32_dcmi *dcmi,
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struct dcmi_buf *buf,
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size_t bytesused,
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int err)
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{
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struct vb2_v4l2_buffer *vbuf;
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if (!buf)
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return;
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list_del_init(&buf->list);
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vbuf = &buf->vb;
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vbuf->sequence = dcmi->sequence++;
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vbuf->field = V4L2_FIELD_NONE;
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vbuf->vb2_buf.timestamp = ktime_get_ns();
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vb2_set_plane_payload(&vbuf->vb2_buf, 0, bytesused);
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vb2_buffer_done(&vbuf->vb2_buf,
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err ? VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE);
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dev_dbg(dcmi->dev, "buffer[%d] done seq=%d, bytesused=%zu\n",
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vbuf->vb2_buf.index, vbuf->sequence, bytesused);
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dcmi->buffers_count++;
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dcmi->active = NULL;
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}
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static int dcmi_restart_capture(struct stm32_dcmi *dcmi)
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{
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struct dcmi_buf *buf;
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spin_lock_irq(&dcmi->irqlock);
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if (dcmi->state != RUNNING) {
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spin_unlock_irq(&dcmi->irqlock);
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return -EINVAL;
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}
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/* Restart a new DMA transfer with next buffer */
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if (list_empty(&dcmi->buffers)) {
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dev_dbg(dcmi->dev, "Capture restart is deferred to next buffer queueing\n");
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dcmi->state = WAIT_FOR_BUFFER;
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spin_unlock_irq(&dcmi->irqlock);
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return 0;
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}
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buf = list_entry(dcmi->buffers.next, struct dcmi_buf, list);
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dcmi->active = buf;
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spin_unlock_irq(&dcmi->irqlock);
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return dcmi_start_capture(dcmi, buf);
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}
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static void dcmi_dma_callback(void *param)
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{
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struct stm32_dcmi *dcmi = (struct stm32_dcmi *)param;
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struct dma_tx_state state;
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enum dma_status status;
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struct dcmi_buf *buf = dcmi->active;
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spin_lock_irq(&dcmi->irqlock);
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/* Check DMA status */
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status = dmaengine_tx_status(dcmi->dma_chan, dcmi->dma_cookie, &state);
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switch (status) {
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case DMA_IN_PROGRESS:
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dev_dbg(dcmi->dev, "%s: Received DMA_IN_PROGRESS\n", __func__);
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break;
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case DMA_PAUSED:
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dev_err(dcmi->dev, "%s: Received DMA_PAUSED\n", __func__);
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break;
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case DMA_ERROR:
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dev_err(dcmi->dev, "%s: Received DMA_ERROR\n", __func__);
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/* Return buffer to V4L2 in error state */
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dcmi_buffer_done(dcmi, buf, 0, -EIO);
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break;
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case DMA_COMPLETE:
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dev_dbg(dcmi->dev, "%s: Received DMA_COMPLETE\n", __func__);
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/* Return buffer to V4L2 */
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dcmi_buffer_done(dcmi, buf, buf->size, 0);
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spin_unlock_irq(&dcmi->irqlock);
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/* Restart capture */
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if (dcmi_restart_capture(dcmi))
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dev_err(dcmi->dev, "%s: Cannot restart capture on DMA complete\n",
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__func__);
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return;
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default:
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dev_err(dcmi->dev, "%s: Received unknown status\n", __func__);
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break;
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}
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spin_unlock_irq(&dcmi->irqlock);
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}
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static int dcmi_start_dma(struct stm32_dcmi *dcmi,
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struct dcmi_buf *buf)
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{
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struct dma_async_tx_descriptor *desc = NULL;
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struct dma_slave_config config;
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int ret;
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memset(&config, 0, sizeof(config));
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config.src_addr = (dma_addr_t)dcmi->res->start + DCMI_DR;
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config.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
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config.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
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config.dst_maxburst = 4;
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/* Configure DMA channel */
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ret = dmaengine_slave_config(dcmi->dma_chan, &config);
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if (ret < 0) {
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dev_err(dcmi->dev, "%s: DMA channel config failed (%d)\n",
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__func__, ret);
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return ret;
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}
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/*
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* Avoid call of dmaengine_terminate_all() between
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* dmaengine_prep_slave_single() and dmaengine_submit()
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* by locking the whole DMA submission sequence
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*/
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mutex_lock(&dcmi->dma_lock);
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/* Prepare a DMA transaction */
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desc = dmaengine_prep_slave_single(dcmi->dma_chan, buf->paddr,
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buf->size,
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DMA_DEV_TO_MEM,
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DMA_PREP_INTERRUPT);
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if (!desc) {
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dev_err(dcmi->dev, "%s: DMA dmaengine_prep_slave_single failed for buffer phy=%pad size=%zu\n",
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__func__, &buf->paddr, buf->size);
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mutex_unlock(&dcmi->dma_lock);
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return -EINVAL;
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}
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/* Set completion callback routine for notification */
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desc->callback = dcmi_dma_callback;
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desc->callback_param = dcmi;
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/* Push current DMA transaction in the pending queue */
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dcmi->dma_cookie = dmaengine_submit(desc);
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if (dma_submit_error(dcmi->dma_cookie)) {
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dev_err(dcmi->dev, "%s: DMA submission failed\n", __func__);
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mutex_unlock(&dcmi->dma_lock);
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return -ENXIO;
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}
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mutex_unlock(&dcmi->dma_lock);
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dma_async_issue_pending(dcmi->dma_chan);
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return 0;
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}
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static int dcmi_start_capture(struct stm32_dcmi *dcmi, struct dcmi_buf *buf)
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{
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int ret;
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if (!buf)
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return -EINVAL;
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ret = dcmi_start_dma(dcmi, buf);
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if (ret) {
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dcmi->errors_count++;
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return ret;
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}
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/* Enable capture */
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reg_set(dcmi->regs, DCMI_CR, CR_CAPTURE);
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return 0;
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}
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static void dcmi_set_crop(struct stm32_dcmi *dcmi)
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{
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u32 size, start;
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/* Crop resolution */
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size = ((dcmi->crop.height - 1) << 16) |
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((dcmi->crop.width << 1) - 1);
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reg_write(dcmi->regs, DCMI_CWSIZE, size);
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/* Crop start point */
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start = ((dcmi->crop.top) << 16) |
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((dcmi->crop.left << 1));
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reg_write(dcmi->regs, DCMI_CWSTRT, start);
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dev_dbg(dcmi->dev, "Cropping to %ux%u@%u:%u\n",
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dcmi->crop.width, dcmi->crop.height,
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dcmi->crop.left, dcmi->crop.top);
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/* Enable crop */
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reg_set(dcmi->regs, DCMI_CR, CR_CROP);
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}
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static void dcmi_process_jpeg(struct stm32_dcmi *dcmi)
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{
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struct dma_tx_state state;
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enum dma_status status;
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struct dcmi_buf *buf = dcmi->active;
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if (!buf)
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return;
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/*
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* Because of variable JPEG buffer size sent by sensor,
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* DMA transfer never completes due to transfer size never reached.
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* In order to ensure that all the JPEG data are transferred
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* in active buffer memory, DMA is drained.
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* Then DMA tx status gives the amount of data transferred
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* to memory, which is then returned to V4L2 through the active
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* buffer payload.
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*/
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/* Drain DMA */
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dmaengine_synchronize(dcmi->dma_chan);
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/* Get DMA residue to get JPEG size */
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status = dmaengine_tx_status(dcmi->dma_chan, dcmi->dma_cookie, &state);
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if (status != DMA_ERROR && state.residue < buf->size) {
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/* Return JPEG buffer to V4L2 with received JPEG buffer size */
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dcmi_buffer_done(dcmi, buf, buf->size - state.residue, 0);
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} else {
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dcmi->errors_count++;
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dev_err(dcmi->dev, "%s: Cannot get JPEG size from DMA\n",
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__func__);
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/* Return JPEG buffer to V4L2 in ERROR state */
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dcmi_buffer_done(dcmi, buf, 0, -EIO);
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}
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/* Abort DMA operation */
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dmaengine_terminate_all(dcmi->dma_chan);
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/* Restart capture */
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if (dcmi_restart_capture(dcmi))
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dev_err(dcmi->dev, "%s: Cannot restart capture on JPEG received\n",
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__func__);
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}
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static irqreturn_t dcmi_irq_thread(int irq, void *arg)
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{
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struct stm32_dcmi *dcmi = arg;
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spin_lock_irq(&dcmi->irqlock);
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if (dcmi->misr & IT_OVR) {
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dcmi->overrun_count++;
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if (dcmi->overrun_count > OVERRUN_ERROR_THRESHOLD)
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dcmi->errors_count++;
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}
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if (dcmi->misr & IT_ERR)
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dcmi->errors_count++;
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if (dcmi->sd_format->fourcc == V4L2_PIX_FMT_JPEG &&
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dcmi->misr & IT_FRAME) {
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/* JPEG received */
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spin_unlock_irq(&dcmi->irqlock);
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dcmi_process_jpeg(dcmi);
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return IRQ_HANDLED;
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}
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spin_unlock_irq(&dcmi->irqlock);
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return IRQ_HANDLED;
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}
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static irqreturn_t dcmi_irq_callback(int irq, void *arg)
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{
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struct stm32_dcmi *dcmi = arg;
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unsigned long flags;
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spin_lock_irqsave(&dcmi->irqlock, flags);
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dcmi->misr = reg_read(dcmi->regs, DCMI_MIS);
|
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/* Clear interrupt */
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reg_set(dcmi->regs, DCMI_ICR, IT_FRAME | IT_OVR | IT_ERR);
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spin_unlock_irqrestore(&dcmi->irqlock, flags);
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return IRQ_WAKE_THREAD;
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}
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static int dcmi_queue_setup(struct vb2_queue *vq,
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unsigned int *nbuffers,
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unsigned int *nplanes,
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unsigned int sizes[],
|
struct device *alloc_devs[])
|
{
|
struct stm32_dcmi *dcmi = vb2_get_drv_priv(vq);
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unsigned int size;
|
|
size = dcmi->fmt.fmt.pix.sizeimage;
|
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/* Make sure the image size is large enough */
|
if (*nplanes)
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return sizes[0] < size ? -EINVAL : 0;
|
|
*nplanes = 1;
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sizes[0] = size;
|
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dev_dbg(dcmi->dev, "Setup queue, count=%d, size=%d\n",
|
*nbuffers, size);
|
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return 0;
|
}
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static int dcmi_buf_init(struct vb2_buffer *vb)
|
{
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struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
|
struct dcmi_buf *buf = container_of(vbuf, struct dcmi_buf, vb);
|
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INIT_LIST_HEAD(&buf->list);
|
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return 0;
|
}
|
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static int dcmi_buf_prepare(struct vb2_buffer *vb)
|
{
|
struct stm32_dcmi *dcmi = vb2_get_drv_priv(vb->vb2_queue);
|
struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
|
struct dcmi_buf *buf = container_of(vbuf, struct dcmi_buf, vb);
|
unsigned long size;
|
|
size = dcmi->fmt.fmt.pix.sizeimage;
|
|
if (vb2_plane_size(vb, 0) < size) {
|
dev_err(dcmi->dev, "%s data will not fit into plane (%lu < %lu)\n",
|
__func__, vb2_plane_size(vb, 0), size);
|
return -EINVAL;
|
}
|
|
vb2_set_plane_payload(vb, 0, size);
|
|
if (!buf->prepared) {
|
/* Get memory addresses */
|
buf->paddr =
|
vb2_dma_contig_plane_dma_addr(&buf->vb.vb2_buf, 0);
|
buf->size = vb2_plane_size(&buf->vb.vb2_buf, 0);
|
buf->prepared = true;
|
|
vb2_set_plane_payload(&buf->vb.vb2_buf, 0, buf->size);
|
|
dev_dbg(dcmi->dev, "buffer[%d] phy=%pad size=%zu\n",
|
vb->index, &buf->paddr, buf->size);
|
}
|
|
return 0;
|
}
|
|
static void dcmi_buf_queue(struct vb2_buffer *vb)
|
{
|
struct stm32_dcmi *dcmi = vb2_get_drv_priv(vb->vb2_queue);
|
struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
|
struct dcmi_buf *buf = container_of(vbuf, struct dcmi_buf, vb);
|
|
spin_lock_irq(&dcmi->irqlock);
|
|
/* Enqueue to video buffers list */
|
list_add_tail(&buf->list, &dcmi->buffers);
|
|
if (dcmi->state == WAIT_FOR_BUFFER) {
|
dcmi->state = RUNNING;
|
dcmi->active = buf;
|
|
dev_dbg(dcmi->dev, "Starting capture on buffer[%d] queued\n",
|
buf->vb.vb2_buf.index);
|
|
spin_unlock_irq(&dcmi->irqlock);
|
if (dcmi_start_capture(dcmi, buf))
|
dev_err(dcmi->dev, "%s: Cannot restart capture on overflow or error\n",
|
__func__);
|
return;
|
}
|
|
spin_unlock_irq(&dcmi->irqlock);
|
}
|
|
static struct media_entity *dcmi_find_source(struct stm32_dcmi *dcmi)
|
{
|
struct media_entity *entity = &dcmi->vdev->entity;
|
struct media_pad *pad;
|
|
/* Walk searching for entity having no sink */
|
while (1) {
|
pad = &entity->pads[0];
|
if (!(pad->flags & MEDIA_PAD_FL_SINK))
|
break;
|
|
pad = media_entity_remote_pad(pad);
|
if (!pad || !is_media_entity_v4l2_subdev(pad->entity))
|
break;
|
|
entity = pad->entity;
|
}
|
|
return entity;
|
}
|
|
static int dcmi_pipeline_s_fmt(struct stm32_dcmi *dcmi,
|
struct v4l2_subdev_pad_config *pad_cfg,
|
struct v4l2_subdev_format *format)
|
{
|
struct media_entity *entity = &dcmi->entity.source->entity;
|
struct v4l2_subdev *subdev;
|
struct media_pad *sink_pad = NULL;
|
struct media_pad *src_pad = NULL;
|
struct media_pad *pad = NULL;
|
struct v4l2_subdev_format fmt = *format;
|
bool found = false;
|
int ret;
|
|
/*
|
* Starting from sensor subdevice, walk within
|
* pipeline and set format on each subdevice
|
*/
|
while (1) {
|
unsigned int i;
|
|
/* Search if current entity has a source pad */
|
for (i = 0; i < entity->num_pads; i++) {
|
pad = &entity->pads[i];
|
if (pad->flags & MEDIA_PAD_FL_SOURCE) {
|
src_pad = pad;
|
found = true;
|
break;
|
}
|
}
|
if (!found)
|
break;
|
|
subdev = media_entity_to_v4l2_subdev(entity);
|
|
/* Propagate format on sink pad if any, otherwise source pad */
|
if (sink_pad)
|
pad = sink_pad;
|
|
dev_dbg(dcmi->dev, "\"%s\":%d pad format set to 0x%x %ux%u\n",
|
subdev->name, pad->index, format->format.code,
|
format->format.width, format->format.height);
|
|
fmt.pad = pad->index;
|
ret = v4l2_subdev_call(subdev, pad, set_fmt, pad_cfg, &fmt);
|
if (ret < 0) {
|
dev_err(dcmi->dev, "%s: Failed to set format 0x%x %ux%u on \"%s\":%d pad (%d)\n",
|
__func__, format->format.code,
|
format->format.width, format->format.height,
|
subdev->name, pad->index, ret);
|
return ret;
|
}
|
|
if (fmt.format.code != format->format.code ||
|
fmt.format.width != format->format.width ||
|
fmt.format.height != format->format.height) {
|
dev_dbg(dcmi->dev, "\"%s\":%d pad format has been changed to 0x%x %ux%u\n",
|
subdev->name, pad->index, fmt.format.code,
|
fmt.format.width, fmt.format.height);
|
}
|
|
/* Walk to next entity */
|
sink_pad = media_entity_remote_pad(src_pad);
|
if (!sink_pad || !is_media_entity_v4l2_subdev(sink_pad->entity))
|
break;
|
|
entity = sink_pad->entity;
|
}
|
*format = fmt;
|
|
return 0;
|
}
|
|
static int dcmi_pipeline_s_stream(struct stm32_dcmi *dcmi, int state)
|
{
|
struct media_entity *entity = &dcmi->vdev->entity;
|
struct v4l2_subdev *subdev;
|
struct media_pad *pad;
|
int ret;
|
|
/* Start/stop all entities within pipeline */
|
while (1) {
|
pad = &entity->pads[0];
|
if (!(pad->flags & MEDIA_PAD_FL_SINK))
|
break;
|
|
pad = media_entity_remote_pad(pad);
|
if (!pad || !is_media_entity_v4l2_subdev(pad->entity))
|
break;
|
|
entity = pad->entity;
|
subdev = media_entity_to_v4l2_subdev(entity);
|
|
ret = v4l2_subdev_call(subdev, video, s_stream, state);
|
if (ret < 0 && ret != -ENOIOCTLCMD) {
|
dev_err(dcmi->dev, "%s: \"%s\" failed to %s streaming (%d)\n",
|
__func__, subdev->name,
|
state ? "start" : "stop", ret);
|
return ret;
|
}
|
|
dev_dbg(dcmi->dev, "\"%s\" is %s\n",
|
subdev->name, state ? "started" : "stopped");
|
}
|
|
return 0;
|
}
|
|
static int dcmi_pipeline_start(struct stm32_dcmi *dcmi)
|
{
|
return dcmi_pipeline_s_stream(dcmi, 1);
|
}
|
|
static void dcmi_pipeline_stop(struct stm32_dcmi *dcmi)
|
{
|
dcmi_pipeline_s_stream(dcmi, 0);
|
}
|
|
static int dcmi_start_streaming(struct vb2_queue *vq, unsigned int count)
|
{
|
struct stm32_dcmi *dcmi = vb2_get_drv_priv(vq);
|
struct dcmi_buf *buf, *node;
|
u32 val = 0;
|
int ret;
|
|
ret = pm_runtime_get_sync(dcmi->dev);
|
if (ret < 0) {
|
dev_err(dcmi->dev, "%s: Failed to start streaming, cannot get sync (%d)\n",
|
__func__, ret);
|
goto err_pm_put;
|
}
|
|
ret = media_pipeline_start(&dcmi->vdev->entity, &dcmi->pipeline);
|
if (ret < 0) {
|
dev_err(dcmi->dev, "%s: Failed to start streaming, media pipeline start error (%d)\n",
|
__func__, ret);
|
goto err_pm_put;
|
}
|
|
ret = dcmi_pipeline_start(dcmi);
|
if (ret)
|
goto err_media_pipeline_stop;
|
|
spin_lock_irq(&dcmi->irqlock);
|
|
/* Set bus width */
|
switch (dcmi->bus.bus_width) {
|
case 14:
|
val |= CR_EDM_0 | CR_EDM_1;
|
break;
|
case 12:
|
val |= CR_EDM_1;
|
break;
|
case 10:
|
val |= CR_EDM_0;
|
break;
|
default:
|
/* Set bus width to 8 bits by default */
|
break;
|
}
|
|
/* Set vertical synchronization polarity */
|
if (dcmi->bus.flags & V4L2_MBUS_VSYNC_ACTIVE_HIGH)
|
val |= CR_VSPOL;
|
|
/* Set horizontal synchronization polarity */
|
if (dcmi->bus.flags & V4L2_MBUS_HSYNC_ACTIVE_HIGH)
|
val |= CR_HSPOL;
|
|
/* Set pixel clock polarity */
|
if (dcmi->bus.flags & V4L2_MBUS_PCLK_SAMPLE_RISING)
|
val |= CR_PCKPOL;
|
|
reg_write(dcmi->regs, DCMI_CR, val);
|
|
/* Set crop */
|
if (dcmi->do_crop)
|
dcmi_set_crop(dcmi);
|
|
/* Enable jpeg capture */
|
if (dcmi->sd_format->fourcc == V4L2_PIX_FMT_JPEG)
|
reg_set(dcmi->regs, DCMI_CR, CR_CM);/* Snapshot mode */
|
|
/* Enable dcmi */
|
reg_set(dcmi->regs, DCMI_CR, CR_ENABLE);
|
|
dcmi->sequence = 0;
|
dcmi->errors_count = 0;
|
dcmi->overrun_count = 0;
|
dcmi->buffers_count = 0;
|
|
/*
|
* Start transfer if at least one buffer has been queued,
|
* otherwise transfer is deferred at buffer queueing
|
*/
|
if (list_empty(&dcmi->buffers)) {
|
dev_dbg(dcmi->dev, "Start streaming is deferred to next buffer queueing\n");
|
dcmi->state = WAIT_FOR_BUFFER;
|
spin_unlock_irq(&dcmi->irqlock);
|
return 0;
|
}
|
|
buf = list_entry(dcmi->buffers.next, struct dcmi_buf, list);
|
dcmi->active = buf;
|
|
dcmi->state = RUNNING;
|
|
dev_dbg(dcmi->dev, "Start streaming, starting capture\n");
|
|
spin_unlock_irq(&dcmi->irqlock);
|
ret = dcmi_start_capture(dcmi, buf);
|
if (ret) {
|
dev_err(dcmi->dev, "%s: Start streaming failed, cannot start capture\n",
|
__func__);
|
goto err_pipeline_stop;
|
}
|
|
/* Enable interruptions */
|
if (dcmi->sd_format->fourcc == V4L2_PIX_FMT_JPEG)
|
reg_set(dcmi->regs, DCMI_IER, IT_FRAME | IT_OVR | IT_ERR);
|
else
|
reg_set(dcmi->regs, DCMI_IER, IT_OVR | IT_ERR);
|
|
return 0;
|
|
err_pipeline_stop:
|
dcmi_pipeline_stop(dcmi);
|
|
err_media_pipeline_stop:
|
media_pipeline_stop(&dcmi->vdev->entity);
|
|
err_pm_put:
|
pm_runtime_put(dcmi->dev);
|
spin_lock_irq(&dcmi->irqlock);
|
/*
|
* Return all buffers to vb2 in QUEUED state.
|
* This will give ownership back to userspace
|
*/
|
list_for_each_entry_safe(buf, node, &dcmi->buffers, list) {
|
list_del_init(&buf->list);
|
vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_QUEUED);
|
}
|
dcmi->active = NULL;
|
spin_unlock_irq(&dcmi->irqlock);
|
|
return ret;
|
}
|
|
static void dcmi_stop_streaming(struct vb2_queue *vq)
|
{
|
struct stm32_dcmi *dcmi = vb2_get_drv_priv(vq);
|
struct dcmi_buf *buf, *node;
|
|
dcmi_pipeline_stop(dcmi);
|
|
media_pipeline_stop(&dcmi->vdev->entity);
|
|
spin_lock_irq(&dcmi->irqlock);
|
|
/* Disable interruptions */
|
reg_clear(dcmi->regs, DCMI_IER, IT_FRAME | IT_OVR | IT_ERR);
|
|
/* Disable DCMI */
|
reg_clear(dcmi->regs, DCMI_CR, CR_ENABLE);
|
|
/* Return all queued buffers to vb2 in ERROR state */
|
list_for_each_entry_safe(buf, node, &dcmi->buffers, list) {
|
list_del_init(&buf->list);
|
vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
|
}
|
|
dcmi->active = NULL;
|
dcmi->state = STOPPED;
|
|
spin_unlock_irq(&dcmi->irqlock);
|
|
/* Stop all pending DMA operations */
|
mutex_lock(&dcmi->dma_lock);
|
dmaengine_terminate_all(dcmi->dma_chan);
|
mutex_unlock(&dcmi->dma_lock);
|
|
pm_runtime_put(dcmi->dev);
|
|
if (dcmi->errors_count)
|
dev_warn(dcmi->dev, "Some errors found while streaming: errors=%d (overrun=%d), buffers=%d\n",
|
dcmi->errors_count, dcmi->overrun_count,
|
dcmi->buffers_count);
|
dev_dbg(dcmi->dev, "Stop streaming, errors=%d (overrun=%d), buffers=%d\n",
|
dcmi->errors_count, dcmi->overrun_count,
|
dcmi->buffers_count);
|
}
|
|
static const struct vb2_ops dcmi_video_qops = {
|
.queue_setup = dcmi_queue_setup,
|
.buf_init = dcmi_buf_init,
|
.buf_prepare = dcmi_buf_prepare,
|
.buf_queue = dcmi_buf_queue,
|
.start_streaming = dcmi_start_streaming,
|
.stop_streaming = dcmi_stop_streaming,
|
.wait_prepare = vb2_ops_wait_prepare,
|
.wait_finish = vb2_ops_wait_finish,
|
};
|
|
static int dcmi_g_fmt_vid_cap(struct file *file, void *priv,
|
struct v4l2_format *fmt)
|
{
|
struct stm32_dcmi *dcmi = video_drvdata(file);
|
|
*fmt = dcmi->fmt;
|
|
return 0;
|
}
|
|
static const struct dcmi_format *find_format_by_fourcc(struct stm32_dcmi *dcmi,
|
unsigned int fourcc)
|
{
|
unsigned int num_formats = dcmi->num_of_sd_formats;
|
const struct dcmi_format *fmt;
|
unsigned int i;
|
|
for (i = 0; i < num_formats; i++) {
|
fmt = dcmi->sd_formats[i];
|
if (fmt->fourcc == fourcc)
|
return fmt;
|
}
|
|
return NULL;
|
}
|
|
static void __find_outer_frame_size(struct stm32_dcmi *dcmi,
|
struct v4l2_pix_format *pix,
|
struct dcmi_framesize *framesize)
|
{
|
struct dcmi_framesize *match = NULL;
|
unsigned int i;
|
unsigned int min_err = UINT_MAX;
|
|
for (i = 0; i < dcmi->num_of_sd_framesizes; i++) {
|
struct dcmi_framesize *fsize = &dcmi->sd_framesizes[i];
|
int w_err = (fsize->width - pix->width);
|
int h_err = (fsize->height - pix->height);
|
int err = w_err + h_err;
|
|
if (w_err >= 0 && h_err >= 0 && err < min_err) {
|
min_err = err;
|
match = fsize;
|
}
|
}
|
if (!match)
|
match = &dcmi->sd_framesizes[0];
|
|
*framesize = *match;
|
}
|
|
static int dcmi_try_fmt(struct stm32_dcmi *dcmi, struct v4l2_format *f,
|
const struct dcmi_format **sd_format,
|
struct dcmi_framesize *sd_framesize)
|
{
|
const struct dcmi_format *sd_fmt;
|
struct dcmi_framesize sd_fsize;
|
struct v4l2_pix_format *pix = &f->fmt.pix;
|
struct v4l2_subdev_pad_config pad_cfg;
|
struct v4l2_subdev_format format = {
|
.which = V4L2_SUBDEV_FORMAT_TRY,
|
};
|
bool do_crop;
|
int ret;
|
|
sd_fmt = find_format_by_fourcc(dcmi, pix->pixelformat);
|
if (!sd_fmt) {
|
if (!dcmi->num_of_sd_formats)
|
return -ENODATA;
|
|
sd_fmt = dcmi->sd_formats[dcmi->num_of_sd_formats - 1];
|
pix->pixelformat = sd_fmt->fourcc;
|
}
|
|
/* Limit to hardware capabilities */
|
pix->width = clamp(pix->width, MIN_WIDTH, MAX_WIDTH);
|
pix->height = clamp(pix->height, MIN_HEIGHT, MAX_HEIGHT);
|
|
/* No crop if JPEG is requested */
|
do_crop = dcmi->do_crop && (pix->pixelformat != V4L2_PIX_FMT_JPEG);
|
|
if (do_crop && dcmi->num_of_sd_framesizes) {
|
struct dcmi_framesize outer_sd_fsize;
|
/*
|
* If crop is requested and sensor have discrete frame sizes,
|
* select the frame size that is just larger than request
|
*/
|
__find_outer_frame_size(dcmi, pix, &outer_sd_fsize);
|
pix->width = outer_sd_fsize.width;
|
pix->height = outer_sd_fsize.height;
|
}
|
|
v4l2_fill_mbus_format(&format.format, pix, sd_fmt->mbus_code);
|
ret = v4l2_subdev_call(dcmi->entity.source, pad, set_fmt,
|
&pad_cfg, &format);
|
if (ret < 0)
|
return ret;
|
|
/* Update pix regarding to what sensor can do */
|
v4l2_fill_pix_format(pix, &format.format);
|
|
/* Save resolution that sensor can actually do */
|
sd_fsize.width = pix->width;
|
sd_fsize.height = pix->height;
|
|
if (do_crop) {
|
struct v4l2_rect c = dcmi->crop;
|
struct v4l2_rect max_rect;
|
|
/*
|
* Adjust crop by making the intersection between
|
* format resolution request and crop request
|
*/
|
max_rect.top = 0;
|
max_rect.left = 0;
|
max_rect.width = pix->width;
|
max_rect.height = pix->height;
|
v4l2_rect_map_inside(&c, &max_rect);
|
c.top = clamp_t(s32, c.top, 0, pix->height - c.height);
|
c.left = clamp_t(s32, c.left, 0, pix->width - c.width);
|
dcmi->crop = c;
|
|
/* Adjust format resolution request to crop */
|
pix->width = dcmi->crop.width;
|
pix->height = dcmi->crop.height;
|
}
|
|
pix->field = V4L2_FIELD_NONE;
|
pix->bytesperline = pix->width * sd_fmt->bpp;
|
pix->sizeimage = pix->bytesperline * pix->height;
|
|
if (sd_format)
|
*sd_format = sd_fmt;
|
if (sd_framesize)
|
*sd_framesize = sd_fsize;
|
|
return 0;
|
}
|
|
static int dcmi_set_fmt(struct stm32_dcmi *dcmi, struct v4l2_format *f)
|
{
|
struct v4l2_subdev_format format = {
|
.which = V4L2_SUBDEV_FORMAT_ACTIVE,
|
};
|
const struct dcmi_format *sd_format;
|
struct dcmi_framesize sd_framesize;
|
struct v4l2_mbus_framefmt *mf = &format.format;
|
struct v4l2_pix_format *pix = &f->fmt.pix;
|
int ret;
|
|
/*
|
* Try format, fmt.width/height could have been changed
|
* to match sensor capability or crop request
|
* sd_format & sd_framesize will contain what subdev
|
* can do for this request.
|
*/
|
ret = dcmi_try_fmt(dcmi, f, &sd_format, &sd_framesize);
|
if (ret)
|
return ret;
|
|
/* Disable crop if JPEG is requested */
|
if (pix->pixelformat == V4L2_PIX_FMT_JPEG)
|
dcmi->do_crop = false;
|
|
/* pix to mbus format */
|
v4l2_fill_mbus_format(mf, pix,
|
sd_format->mbus_code);
|
mf->width = sd_framesize.width;
|
mf->height = sd_framesize.height;
|
|
ret = dcmi_pipeline_s_fmt(dcmi, NULL, &format);
|
if (ret < 0)
|
return ret;
|
|
dev_dbg(dcmi->dev, "Sensor format set to 0x%x %ux%u\n",
|
mf->code, mf->width, mf->height);
|
dev_dbg(dcmi->dev, "Buffer format set to %4.4s %ux%u\n",
|
(char *)&pix->pixelformat,
|
pix->width, pix->height);
|
|
dcmi->fmt = *f;
|
dcmi->sd_format = sd_format;
|
dcmi->sd_framesize = sd_framesize;
|
|
return 0;
|
}
|
|
static int dcmi_s_fmt_vid_cap(struct file *file, void *priv,
|
struct v4l2_format *f)
|
{
|
struct stm32_dcmi *dcmi = video_drvdata(file);
|
|
if (vb2_is_streaming(&dcmi->queue))
|
return -EBUSY;
|
|
return dcmi_set_fmt(dcmi, f);
|
}
|
|
static int dcmi_try_fmt_vid_cap(struct file *file, void *priv,
|
struct v4l2_format *f)
|
{
|
struct stm32_dcmi *dcmi = video_drvdata(file);
|
|
return dcmi_try_fmt(dcmi, f, NULL, NULL);
|
}
|
|
static int dcmi_enum_fmt_vid_cap(struct file *file, void *priv,
|
struct v4l2_fmtdesc *f)
|
{
|
struct stm32_dcmi *dcmi = video_drvdata(file);
|
|
if (f->index >= dcmi->num_of_sd_formats)
|
return -EINVAL;
|
|
f->pixelformat = dcmi->sd_formats[f->index]->fourcc;
|
return 0;
|
}
|
|
static int dcmi_get_sensor_format(struct stm32_dcmi *dcmi,
|
struct v4l2_pix_format *pix)
|
{
|
struct v4l2_subdev_format fmt = {
|
.which = V4L2_SUBDEV_FORMAT_ACTIVE,
|
};
|
int ret;
|
|
ret = v4l2_subdev_call(dcmi->entity.source, pad, get_fmt, NULL, &fmt);
|
if (ret)
|
return ret;
|
|
v4l2_fill_pix_format(pix, &fmt.format);
|
|
return 0;
|
}
|
|
static int dcmi_set_sensor_format(struct stm32_dcmi *dcmi,
|
struct v4l2_pix_format *pix)
|
{
|
const struct dcmi_format *sd_fmt;
|
struct v4l2_subdev_format format = {
|
.which = V4L2_SUBDEV_FORMAT_TRY,
|
};
|
struct v4l2_subdev_pad_config pad_cfg;
|
int ret;
|
|
sd_fmt = find_format_by_fourcc(dcmi, pix->pixelformat);
|
if (!sd_fmt) {
|
if (!dcmi->num_of_sd_formats)
|
return -ENODATA;
|
|
sd_fmt = dcmi->sd_formats[dcmi->num_of_sd_formats - 1];
|
pix->pixelformat = sd_fmt->fourcc;
|
}
|
|
v4l2_fill_mbus_format(&format.format, pix, sd_fmt->mbus_code);
|
ret = v4l2_subdev_call(dcmi->entity.source, pad, set_fmt,
|
&pad_cfg, &format);
|
if (ret < 0)
|
return ret;
|
|
return 0;
|
}
|
|
static int dcmi_get_sensor_bounds(struct stm32_dcmi *dcmi,
|
struct v4l2_rect *r)
|
{
|
struct v4l2_subdev_selection bounds = {
|
.which = V4L2_SUBDEV_FORMAT_ACTIVE,
|
.target = V4L2_SEL_TGT_CROP_BOUNDS,
|
};
|
unsigned int max_width, max_height, max_pixsize;
|
struct v4l2_pix_format pix;
|
unsigned int i;
|
int ret;
|
|
/*
|
* Get sensor bounds first
|
*/
|
ret = v4l2_subdev_call(dcmi->entity.source, pad, get_selection,
|
NULL, &bounds);
|
if (!ret)
|
*r = bounds.r;
|
if (ret != -ENOIOCTLCMD)
|
return ret;
|
|
/*
|
* If selection is not implemented,
|
* fallback by enumerating sensor frame sizes
|
* and take the largest one
|
*/
|
max_width = 0;
|
max_height = 0;
|
max_pixsize = 0;
|
for (i = 0; i < dcmi->num_of_sd_framesizes; i++) {
|
struct dcmi_framesize *fsize = &dcmi->sd_framesizes[i];
|
unsigned int pixsize = fsize->width * fsize->height;
|
|
if (pixsize > max_pixsize) {
|
max_pixsize = pixsize;
|
max_width = fsize->width;
|
max_height = fsize->height;
|
}
|
}
|
if (max_pixsize > 0) {
|
r->top = 0;
|
r->left = 0;
|
r->width = max_width;
|
r->height = max_height;
|
return 0;
|
}
|
|
/*
|
* If frame sizes enumeration is not implemented,
|
* fallback by getting current sensor frame size
|
*/
|
ret = dcmi_get_sensor_format(dcmi, &pix);
|
if (ret)
|
return ret;
|
|
r->top = 0;
|
r->left = 0;
|
r->width = pix.width;
|
r->height = pix.height;
|
|
return 0;
|
}
|
|
static int dcmi_g_selection(struct file *file, void *fh,
|
struct v4l2_selection *s)
|
{
|
struct stm32_dcmi *dcmi = video_drvdata(file);
|
|
if (s->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
|
return -EINVAL;
|
|
switch (s->target) {
|
case V4L2_SEL_TGT_CROP_DEFAULT:
|
case V4L2_SEL_TGT_CROP_BOUNDS:
|
s->r = dcmi->sd_bounds;
|
return 0;
|
case V4L2_SEL_TGT_CROP:
|
if (dcmi->do_crop) {
|
s->r = dcmi->crop;
|
} else {
|
s->r.top = 0;
|
s->r.left = 0;
|
s->r.width = dcmi->fmt.fmt.pix.width;
|
s->r.height = dcmi->fmt.fmt.pix.height;
|
}
|
break;
|
default:
|
return -EINVAL;
|
}
|
|
return 0;
|
}
|
|
static int dcmi_s_selection(struct file *file, void *priv,
|
struct v4l2_selection *s)
|
{
|
struct stm32_dcmi *dcmi = video_drvdata(file);
|
struct v4l2_rect r = s->r;
|
struct v4l2_rect max_rect;
|
struct v4l2_pix_format pix;
|
|
if (s->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
|
s->target != V4L2_SEL_TGT_CROP)
|
return -EINVAL;
|
|
/* Reset sensor resolution to max resolution */
|
pix.pixelformat = dcmi->fmt.fmt.pix.pixelformat;
|
pix.width = dcmi->sd_bounds.width;
|
pix.height = dcmi->sd_bounds.height;
|
dcmi_set_sensor_format(dcmi, &pix);
|
|
/*
|
* Make the intersection between
|
* sensor resolution
|
* and crop request
|
*/
|
max_rect.top = 0;
|
max_rect.left = 0;
|
max_rect.width = pix.width;
|
max_rect.height = pix.height;
|
v4l2_rect_map_inside(&r, &max_rect);
|
r.top = clamp_t(s32, r.top, 0, pix.height - r.height);
|
r.left = clamp_t(s32, r.left, 0, pix.width - r.width);
|
|
if (!(r.top == dcmi->sd_bounds.top &&
|
r.left == dcmi->sd_bounds.left &&
|
r.width == dcmi->sd_bounds.width &&
|
r.height == dcmi->sd_bounds.height)) {
|
/* Crop if request is different than sensor resolution */
|
dcmi->do_crop = true;
|
dcmi->crop = r;
|
dev_dbg(dcmi->dev, "s_selection: crop %ux%u@(%u,%u) from %ux%u\n",
|
r.width, r.height, r.left, r.top,
|
pix.width, pix.height);
|
} else {
|
/* Disable crop */
|
dcmi->do_crop = false;
|
dev_dbg(dcmi->dev, "s_selection: crop is disabled\n");
|
}
|
|
s->r = r;
|
return 0;
|
}
|
|
static int dcmi_querycap(struct file *file, void *priv,
|
struct v4l2_capability *cap)
|
{
|
strscpy(cap->driver, DRV_NAME, sizeof(cap->driver));
|
strscpy(cap->card, "STM32 Camera Memory Interface",
|
sizeof(cap->card));
|
strscpy(cap->bus_info, "platform:dcmi", sizeof(cap->bus_info));
|
return 0;
|
}
|
|
static int dcmi_enum_input(struct file *file, void *priv,
|
struct v4l2_input *i)
|
{
|
if (i->index != 0)
|
return -EINVAL;
|
|
i->type = V4L2_INPUT_TYPE_CAMERA;
|
strscpy(i->name, "Camera", sizeof(i->name));
|
return 0;
|
}
|
|
static int dcmi_g_input(struct file *file, void *priv, unsigned int *i)
|
{
|
*i = 0;
|
return 0;
|
}
|
|
static int dcmi_s_input(struct file *file, void *priv, unsigned int i)
|
{
|
if (i > 0)
|
return -EINVAL;
|
return 0;
|
}
|
|
static int dcmi_enum_framesizes(struct file *file, void *fh,
|
struct v4l2_frmsizeenum *fsize)
|
{
|
struct stm32_dcmi *dcmi = video_drvdata(file);
|
const struct dcmi_format *sd_fmt;
|
struct v4l2_subdev_frame_size_enum fse = {
|
.index = fsize->index,
|
.which = V4L2_SUBDEV_FORMAT_ACTIVE,
|
};
|
int ret;
|
|
sd_fmt = find_format_by_fourcc(dcmi, fsize->pixel_format);
|
if (!sd_fmt)
|
return -EINVAL;
|
|
fse.code = sd_fmt->mbus_code;
|
|
ret = v4l2_subdev_call(dcmi->entity.source, pad, enum_frame_size,
|
NULL, &fse);
|
if (ret)
|
return ret;
|
|
fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
|
fsize->discrete.width = fse.max_width;
|
fsize->discrete.height = fse.max_height;
|
|
return 0;
|
}
|
|
static int dcmi_g_parm(struct file *file, void *priv,
|
struct v4l2_streamparm *p)
|
{
|
struct stm32_dcmi *dcmi = video_drvdata(file);
|
|
return v4l2_g_parm_cap(video_devdata(file), dcmi->entity.source, p);
|
}
|
|
static int dcmi_s_parm(struct file *file, void *priv,
|
struct v4l2_streamparm *p)
|
{
|
struct stm32_dcmi *dcmi = video_drvdata(file);
|
|
return v4l2_s_parm_cap(video_devdata(file), dcmi->entity.source, p);
|
}
|
|
static int dcmi_enum_frameintervals(struct file *file, void *fh,
|
struct v4l2_frmivalenum *fival)
|
{
|
struct stm32_dcmi *dcmi = video_drvdata(file);
|
const struct dcmi_format *sd_fmt;
|
struct v4l2_subdev_frame_interval_enum fie = {
|
.index = fival->index,
|
.width = fival->width,
|
.height = fival->height,
|
.which = V4L2_SUBDEV_FORMAT_ACTIVE,
|
};
|
int ret;
|
|
sd_fmt = find_format_by_fourcc(dcmi, fival->pixel_format);
|
if (!sd_fmt)
|
return -EINVAL;
|
|
fie.code = sd_fmt->mbus_code;
|
|
ret = v4l2_subdev_call(dcmi->entity.source, pad,
|
enum_frame_interval, NULL, &fie);
|
if (ret)
|
return ret;
|
|
fival->type = V4L2_FRMIVAL_TYPE_DISCRETE;
|
fival->discrete = fie.interval;
|
|
return 0;
|
}
|
|
static const struct of_device_id stm32_dcmi_of_match[] = {
|
{ .compatible = "st,stm32-dcmi"},
|
{ /* end node */ },
|
};
|
MODULE_DEVICE_TABLE(of, stm32_dcmi_of_match);
|
|
static int dcmi_open(struct file *file)
|
{
|
struct stm32_dcmi *dcmi = video_drvdata(file);
|
struct v4l2_subdev *sd = dcmi->entity.source;
|
int ret;
|
|
if (mutex_lock_interruptible(&dcmi->lock))
|
return -ERESTARTSYS;
|
|
ret = v4l2_fh_open(file);
|
if (ret < 0)
|
goto unlock;
|
|
if (!v4l2_fh_is_singular_file(file))
|
goto fh_rel;
|
|
ret = v4l2_subdev_call(sd, core, s_power, 1);
|
if (ret < 0 && ret != -ENOIOCTLCMD)
|
goto fh_rel;
|
|
ret = dcmi_set_fmt(dcmi, &dcmi->fmt);
|
if (ret)
|
v4l2_subdev_call(sd, core, s_power, 0);
|
fh_rel:
|
if (ret)
|
v4l2_fh_release(file);
|
unlock:
|
mutex_unlock(&dcmi->lock);
|
return ret;
|
}
|
|
static int dcmi_release(struct file *file)
|
{
|
struct stm32_dcmi *dcmi = video_drvdata(file);
|
struct v4l2_subdev *sd = dcmi->entity.source;
|
bool fh_singular;
|
int ret;
|
|
mutex_lock(&dcmi->lock);
|
|
fh_singular = v4l2_fh_is_singular_file(file);
|
|
ret = _vb2_fop_release(file, NULL);
|
|
if (fh_singular)
|
v4l2_subdev_call(sd, core, s_power, 0);
|
|
mutex_unlock(&dcmi->lock);
|
|
return ret;
|
}
|
|
static const struct v4l2_ioctl_ops dcmi_ioctl_ops = {
|
.vidioc_querycap = dcmi_querycap,
|
|
.vidioc_try_fmt_vid_cap = dcmi_try_fmt_vid_cap,
|
.vidioc_g_fmt_vid_cap = dcmi_g_fmt_vid_cap,
|
.vidioc_s_fmt_vid_cap = dcmi_s_fmt_vid_cap,
|
.vidioc_enum_fmt_vid_cap = dcmi_enum_fmt_vid_cap,
|
.vidioc_g_selection = dcmi_g_selection,
|
.vidioc_s_selection = dcmi_s_selection,
|
|
.vidioc_enum_input = dcmi_enum_input,
|
.vidioc_g_input = dcmi_g_input,
|
.vidioc_s_input = dcmi_s_input,
|
|
.vidioc_g_parm = dcmi_g_parm,
|
.vidioc_s_parm = dcmi_s_parm,
|
|
.vidioc_enum_framesizes = dcmi_enum_framesizes,
|
.vidioc_enum_frameintervals = dcmi_enum_frameintervals,
|
|
.vidioc_reqbufs = vb2_ioctl_reqbufs,
|
.vidioc_create_bufs = vb2_ioctl_create_bufs,
|
.vidioc_querybuf = vb2_ioctl_querybuf,
|
.vidioc_qbuf = vb2_ioctl_qbuf,
|
.vidioc_dqbuf = vb2_ioctl_dqbuf,
|
.vidioc_expbuf = vb2_ioctl_expbuf,
|
.vidioc_prepare_buf = vb2_ioctl_prepare_buf,
|
.vidioc_streamon = vb2_ioctl_streamon,
|
.vidioc_streamoff = vb2_ioctl_streamoff,
|
|
.vidioc_log_status = v4l2_ctrl_log_status,
|
.vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
|
.vidioc_unsubscribe_event = v4l2_event_unsubscribe,
|
};
|
|
static const struct v4l2_file_operations dcmi_fops = {
|
.owner = THIS_MODULE,
|
.unlocked_ioctl = video_ioctl2,
|
.open = dcmi_open,
|
.release = dcmi_release,
|
.poll = vb2_fop_poll,
|
.mmap = vb2_fop_mmap,
|
#ifndef CONFIG_MMU
|
.get_unmapped_area = vb2_fop_get_unmapped_area,
|
#endif
|
.read = vb2_fop_read,
|
};
|
|
static int dcmi_set_default_fmt(struct stm32_dcmi *dcmi)
|
{
|
struct v4l2_format f = {
|
.type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
|
.fmt.pix = {
|
.width = CIF_WIDTH,
|
.height = CIF_HEIGHT,
|
.field = V4L2_FIELD_NONE,
|
.pixelformat = dcmi->sd_formats[0]->fourcc,
|
},
|
};
|
int ret;
|
|
ret = dcmi_try_fmt(dcmi, &f, NULL, NULL);
|
if (ret)
|
return ret;
|
dcmi->sd_format = dcmi->sd_formats[0];
|
dcmi->fmt = f;
|
return 0;
|
}
|
|
/*
|
* FIXME: For the time being we only support subdevices
|
* which expose RGB & YUV "parallel form" mbus code (_2X8).
|
* Nevertheless, this allows to support serial source subdevices
|
* and serial to parallel bridges which conform to this.
|
*/
|
static const struct dcmi_format dcmi_formats[] = {
|
{
|
.fourcc = V4L2_PIX_FMT_RGB565,
|
.mbus_code = MEDIA_BUS_FMT_RGB565_2X8_LE,
|
.bpp = 2,
|
}, {
|
.fourcc = V4L2_PIX_FMT_YUYV,
|
.mbus_code = MEDIA_BUS_FMT_YUYV8_2X8,
|
.bpp = 2,
|
}, {
|
.fourcc = V4L2_PIX_FMT_UYVY,
|
.mbus_code = MEDIA_BUS_FMT_UYVY8_2X8,
|
.bpp = 2,
|
}, {
|
.fourcc = V4L2_PIX_FMT_JPEG,
|
.mbus_code = MEDIA_BUS_FMT_JPEG_1X8,
|
.bpp = 1,
|
},
|
};
|
|
static int dcmi_formats_init(struct stm32_dcmi *dcmi)
|
{
|
const struct dcmi_format *sd_fmts[ARRAY_SIZE(dcmi_formats)];
|
unsigned int num_fmts = 0, i, j;
|
struct v4l2_subdev *subdev = dcmi->entity.source;
|
struct v4l2_subdev_mbus_code_enum mbus_code = {
|
.which = V4L2_SUBDEV_FORMAT_ACTIVE,
|
};
|
|
while (!v4l2_subdev_call(subdev, pad, enum_mbus_code,
|
NULL, &mbus_code)) {
|
for (i = 0; i < ARRAY_SIZE(dcmi_formats); i++) {
|
if (dcmi_formats[i].mbus_code != mbus_code.code)
|
continue;
|
|
/* Code supported, have we got this fourcc yet? */
|
for (j = 0; j < num_fmts; j++)
|
if (sd_fmts[j]->fourcc ==
|
dcmi_formats[i].fourcc) {
|
/* Already available */
|
dev_dbg(dcmi->dev, "Skipping fourcc/code: %4.4s/0x%x\n",
|
(char *)&sd_fmts[j]->fourcc,
|
mbus_code.code);
|
break;
|
}
|
if (j == num_fmts) {
|
/* New */
|
sd_fmts[num_fmts++] = dcmi_formats + i;
|
dev_dbg(dcmi->dev, "Supported fourcc/code: %4.4s/0x%x\n",
|
(char *)&sd_fmts[num_fmts - 1]->fourcc,
|
sd_fmts[num_fmts - 1]->mbus_code);
|
}
|
}
|
mbus_code.index++;
|
}
|
|
if (!num_fmts)
|
return -ENXIO;
|
|
dcmi->num_of_sd_formats = num_fmts;
|
dcmi->sd_formats = devm_kcalloc(dcmi->dev,
|
num_fmts, sizeof(struct dcmi_format *),
|
GFP_KERNEL);
|
if (!dcmi->sd_formats) {
|
dev_err(dcmi->dev, "Could not allocate memory\n");
|
return -ENOMEM;
|
}
|
|
memcpy(dcmi->sd_formats, sd_fmts,
|
num_fmts * sizeof(struct dcmi_format *));
|
dcmi->sd_format = dcmi->sd_formats[0];
|
|
return 0;
|
}
|
|
static int dcmi_framesizes_init(struct stm32_dcmi *dcmi)
|
{
|
unsigned int num_fsize = 0;
|
struct v4l2_subdev *subdev = dcmi->entity.source;
|
struct v4l2_subdev_frame_size_enum fse = {
|
.which = V4L2_SUBDEV_FORMAT_ACTIVE,
|
.code = dcmi->sd_format->mbus_code,
|
};
|
unsigned int ret;
|
unsigned int i;
|
|
/* Allocate discrete framesizes array */
|
while (!v4l2_subdev_call(subdev, pad, enum_frame_size,
|
NULL, &fse))
|
fse.index++;
|
|
num_fsize = fse.index;
|
if (!num_fsize)
|
return 0;
|
|
dcmi->num_of_sd_framesizes = num_fsize;
|
dcmi->sd_framesizes = devm_kcalloc(dcmi->dev, num_fsize,
|
sizeof(struct dcmi_framesize),
|
GFP_KERNEL);
|
if (!dcmi->sd_framesizes) {
|
dev_err(dcmi->dev, "Could not allocate memory\n");
|
return -ENOMEM;
|
}
|
|
/* Fill array with sensor supported framesizes */
|
dev_dbg(dcmi->dev, "Sensor supports %u frame sizes:\n", num_fsize);
|
for (i = 0; i < dcmi->num_of_sd_framesizes; i++) {
|
fse.index = i;
|
ret = v4l2_subdev_call(subdev, pad, enum_frame_size,
|
NULL, &fse);
|
if (ret)
|
return ret;
|
dcmi->sd_framesizes[fse.index].width = fse.max_width;
|
dcmi->sd_framesizes[fse.index].height = fse.max_height;
|
dev_dbg(dcmi->dev, "%ux%u\n", fse.max_width, fse.max_height);
|
}
|
|
return 0;
|
}
|
|
static int dcmi_graph_notify_complete(struct v4l2_async_notifier *notifier)
|
{
|
struct stm32_dcmi *dcmi = notifier_to_dcmi(notifier);
|
int ret;
|
|
/*
|
* Now that the graph is complete,
|
* we search for the source subdevice
|
* in order to expose it through V4L2 interface
|
*/
|
dcmi->entity.source =
|
media_entity_to_v4l2_subdev(dcmi_find_source(dcmi));
|
if (!dcmi->entity.source) {
|
dev_err(dcmi->dev, "Source subdevice not found\n");
|
return -ENODEV;
|
}
|
|
dcmi->vdev->ctrl_handler = dcmi->entity.source->ctrl_handler;
|
|
ret = dcmi_formats_init(dcmi);
|
if (ret) {
|
dev_err(dcmi->dev, "No supported mediabus format found\n");
|
return ret;
|
}
|
|
ret = dcmi_framesizes_init(dcmi);
|
if (ret) {
|
dev_err(dcmi->dev, "Could not initialize framesizes\n");
|
return ret;
|
}
|
|
ret = dcmi_get_sensor_bounds(dcmi, &dcmi->sd_bounds);
|
if (ret) {
|
dev_err(dcmi->dev, "Could not get sensor bounds\n");
|
return ret;
|
}
|
|
ret = dcmi_set_default_fmt(dcmi);
|
if (ret) {
|
dev_err(dcmi->dev, "Could not set default format\n");
|
return ret;
|
}
|
|
ret = devm_request_threaded_irq(dcmi->dev, dcmi->irq, dcmi_irq_callback,
|
dcmi_irq_thread, IRQF_ONESHOT,
|
dev_name(dcmi->dev), dcmi);
|
if (ret) {
|
dev_err(dcmi->dev, "Unable to request irq %d\n", dcmi->irq);
|
return ret;
|
}
|
|
return 0;
|
}
|
|
static void dcmi_graph_notify_unbind(struct v4l2_async_notifier *notifier,
|
struct v4l2_subdev *sd,
|
struct v4l2_async_subdev *asd)
|
{
|
struct stm32_dcmi *dcmi = notifier_to_dcmi(notifier);
|
|
dev_dbg(dcmi->dev, "Removing %s\n", video_device_node_name(dcmi->vdev));
|
|
/* Checks internally if vdev has been init or not */
|
video_unregister_device(dcmi->vdev);
|
}
|
|
static int dcmi_graph_notify_bound(struct v4l2_async_notifier *notifier,
|
struct v4l2_subdev *subdev,
|
struct v4l2_async_subdev *asd)
|
{
|
struct stm32_dcmi *dcmi = notifier_to_dcmi(notifier);
|
unsigned int ret;
|
int src_pad;
|
|
dev_dbg(dcmi->dev, "Subdev \"%s\" bound\n", subdev->name);
|
|
/*
|
* Link this sub-device to DCMI, it could be
|
* a parallel camera sensor or a bridge
|
*/
|
src_pad = media_entity_get_fwnode_pad(&subdev->entity,
|
subdev->fwnode,
|
MEDIA_PAD_FL_SOURCE);
|
|
ret = media_create_pad_link(&subdev->entity, src_pad,
|
&dcmi->vdev->entity, 0,
|
MEDIA_LNK_FL_IMMUTABLE |
|
MEDIA_LNK_FL_ENABLED);
|
if (ret)
|
dev_err(dcmi->dev, "Failed to create media pad link with subdev \"%s\"\n",
|
subdev->name);
|
else
|
dev_dbg(dcmi->dev, "DCMI is now linked to \"%s\"\n",
|
subdev->name);
|
|
return ret;
|
}
|
|
static const struct v4l2_async_notifier_operations dcmi_graph_notify_ops = {
|
.bound = dcmi_graph_notify_bound,
|
.unbind = dcmi_graph_notify_unbind,
|
.complete = dcmi_graph_notify_complete,
|
};
|
|
static int dcmi_graph_parse(struct stm32_dcmi *dcmi, struct device_node *node)
|
{
|
struct device_node *ep = NULL;
|
struct device_node *remote;
|
|
ep = of_graph_get_next_endpoint(node, ep);
|
if (!ep)
|
return -EINVAL;
|
|
remote = of_graph_get_remote_port_parent(ep);
|
of_node_put(ep);
|
if (!remote)
|
return -EINVAL;
|
|
/* Remote node to connect */
|
dcmi->entity.remote_node = remote;
|
dcmi->entity.asd.match_type = V4L2_ASYNC_MATCH_FWNODE;
|
dcmi->entity.asd.match.fwnode = of_fwnode_handle(remote);
|
return 0;
|
}
|
|
static int dcmi_graph_init(struct stm32_dcmi *dcmi)
|
{
|
int ret;
|
|
/* Parse the graph to extract a list of subdevice DT nodes. */
|
ret = dcmi_graph_parse(dcmi, dcmi->dev->of_node);
|
if (ret < 0) {
|
dev_err(dcmi->dev, "Failed to parse graph\n");
|
return ret;
|
}
|
|
v4l2_async_notifier_init(&dcmi->notifier);
|
|
ret = v4l2_async_notifier_add_subdev(&dcmi->notifier,
|
&dcmi->entity.asd);
|
if (ret) {
|
dev_err(dcmi->dev, "Failed to add subdev notifier\n");
|
of_node_put(dcmi->entity.remote_node);
|
return ret;
|
}
|
|
dcmi->notifier.ops = &dcmi_graph_notify_ops;
|
|
ret = v4l2_async_notifier_register(&dcmi->v4l2_dev, &dcmi->notifier);
|
if (ret < 0) {
|
dev_err(dcmi->dev, "Failed to register notifier\n");
|
v4l2_async_notifier_cleanup(&dcmi->notifier);
|
return ret;
|
}
|
|
return 0;
|
}
|
|
static int dcmi_probe(struct platform_device *pdev)
|
{
|
struct device_node *np = pdev->dev.of_node;
|
const struct of_device_id *match = NULL;
|
struct v4l2_fwnode_endpoint ep = { .bus_type = 0 };
|
struct stm32_dcmi *dcmi;
|
struct vb2_queue *q;
|
struct dma_chan *chan;
|
struct clk *mclk;
|
int irq;
|
int ret = 0;
|
|
match = of_match_device(of_match_ptr(stm32_dcmi_of_match), &pdev->dev);
|
if (!match) {
|
dev_err(&pdev->dev, "Could not find a match in devicetree\n");
|
return -ENODEV;
|
}
|
|
dcmi = devm_kzalloc(&pdev->dev, sizeof(struct stm32_dcmi), GFP_KERNEL);
|
if (!dcmi)
|
return -ENOMEM;
|
|
dcmi->rstc = devm_reset_control_get_exclusive(&pdev->dev, NULL);
|
if (IS_ERR(dcmi->rstc)) {
|
dev_err(&pdev->dev, "Could not get reset control\n");
|
return PTR_ERR(dcmi->rstc);
|
}
|
|
/* Get bus characteristics from devicetree */
|
np = of_graph_get_next_endpoint(np, NULL);
|
if (!np) {
|
dev_err(&pdev->dev, "Could not find the endpoint\n");
|
return -ENODEV;
|
}
|
|
ret = v4l2_fwnode_endpoint_parse(of_fwnode_handle(np), &ep);
|
of_node_put(np);
|
if (ret) {
|
dev_err(&pdev->dev, "Could not parse the endpoint\n");
|
return ret;
|
}
|
|
if (ep.bus_type == V4L2_MBUS_CSI2_DPHY) {
|
dev_err(&pdev->dev, "CSI bus not supported\n");
|
return -ENODEV;
|
}
|
dcmi->bus.flags = ep.bus.parallel.flags;
|
dcmi->bus.bus_width = ep.bus.parallel.bus_width;
|
dcmi->bus.data_shift = ep.bus.parallel.data_shift;
|
|
irq = platform_get_irq(pdev, 0);
|
if (irq <= 0)
|
return irq ? irq : -ENXIO;
|
|
dcmi->irq = irq;
|
|
dcmi->res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
if (!dcmi->res) {
|
dev_err(&pdev->dev, "Could not get resource\n");
|
return -ENODEV;
|
}
|
|
dcmi->regs = devm_ioremap_resource(&pdev->dev, dcmi->res);
|
if (IS_ERR(dcmi->regs)) {
|
dev_err(&pdev->dev, "Could not map registers\n");
|
return PTR_ERR(dcmi->regs);
|
}
|
|
mclk = devm_clk_get(&pdev->dev, "mclk");
|
if (IS_ERR(mclk)) {
|
if (PTR_ERR(mclk) != -EPROBE_DEFER)
|
dev_err(&pdev->dev, "Unable to get mclk\n");
|
return PTR_ERR(mclk);
|
}
|
|
chan = dma_request_chan(&pdev->dev, "tx");
|
if (IS_ERR(chan)) {
|
ret = PTR_ERR(chan);
|
if (ret != -EPROBE_DEFER)
|
dev_err(&pdev->dev,
|
"Failed to request DMA channel: %d\n", ret);
|
return ret;
|
}
|
|
spin_lock_init(&dcmi->irqlock);
|
mutex_init(&dcmi->lock);
|
mutex_init(&dcmi->dma_lock);
|
init_completion(&dcmi->complete);
|
INIT_LIST_HEAD(&dcmi->buffers);
|
|
dcmi->dev = &pdev->dev;
|
dcmi->mclk = mclk;
|
dcmi->state = STOPPED;
|
dcmi->dma_chan = chan;
|
|
q = &dcmi->queue;
|
|
dcmi->v4l2_dev.mdev = &dcmi->mdev;
|
|
/* Initialize media device */
|
strscpy(dcmi->mdev.model, DRV_NAME, sizeof(dcmi->mdev.model));
|
snprintf(dcmi->mdev.bus_info, sizeof(dcmi->mdev.bus_info),
|
"platform:%s", DRV_NAME);
|
dcmi->mdev.dev = &pdev->dev;
|
media_device_init(&dcmi->mdev);
|
|
/* Initialize the top-level structure */
|
ret = v4l2_device_register(&pdev->dev, &dcmi->v4l2_dev);
|
if (ret)
|
goto err_media_device_cleanup;
|
|
dcmi->vdev = video_device_alloc();
|
if (!dcmi->vdev) {
|
ret = -ENOMEM;
|
goto err_device_unregister;
|
}
|
|
/* Video node */
|
dcmi->vdev->fops = &dcmi_fops;
|
dcmi->vdev->v4l2_dev = &dcmi->v4l2_dev;
|
dcmi->vdev->queue = &dcmi->queue;
|
strscpy(dcmi->vdev->name, KBUILD_MODNAME, sizeof(dcmi->vdev->name));
|
dcmi->vdev->release = video_device_release;
|
dcmi->vdev->ioctl_ops = &dcmi_ioctl_ops;
|
dcmi->vdev->lock = &dcmi->lock;
|
dcmi->vdev->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING |
|
V4L2_CAP_READWRITE;
|
video_set_drvdata(dcmi->vdev, dcmi);
|
|
/* Media entity pads */
|
dcmi->vid_cap_pad.flags = MEDIA_PAD_FL_SINK;
|
ret = media_entity_pads_init(&dcmi->vdev->entity,
|
1, &dcmi->vid_cap_pad);
|
if (ret) {
|
dev_err(dcmi->dev, "Failed to init media entity pad\n");
|
goto err_device_release;
|
}
|
dcmi->vdev->entity.flags |= MEDIA_ENT_FL_DEFAULT;
|
|
ret = video_register_device(dcmi->vdev, VFL_TYPE_VIDEO, -1);
|
if (ret) {
|
dev_err(dcmi->dev, "Failed to register video device\n");
|
goto err_media_entity_cleanup;
|
}
|
|
dev_dbg(dcmi->dev, "Device registered as %s\n",
|
video_device_node_name(dcmi->vdev));
|
|
/* Buffer queue */
|
q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
|
q->io_modes = VB2_MMAP | VB2_READ | VB2_DMABUF;
|
q->lock = &dcmi->lock;
|
q->drv_priv = dcmi;
|
q->buf_struct_size = sizeof(struct dcmi_buf);
|
q->ops = &dcmi_video_qops;
|
q->mem_ops = &vb2_dma_contig_memops;
|
q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
|
q->min_buffers_needed = 2;
|
q->dev = &pdev->dev;
|
|
ret = vb2_queue_init(q);
|
if (ret < 0) {
|
dev_err(&pdev->dev, "Failed to initialize vb2 queue\n");
|
goto err_media_entity_cleanup;
|
}
|
|
ret = dcmi_graph_init(dcmi);
|
if (ret < 0)
|
goto err_media_entity_cleanup;
|
|
/* Reset device */
|
ret = reset_control_assert(dcmi->rstc);
|
if (ret) {
|
dev_err(&pdev->dev, "Failed to assert the reset line\n");
|
goto err_cleanup;
|
}
|
|
usleep_range(3000, 5000);
|
|
ret = reset_control_deassert(dcmi->rstc);
|
if (ret) {
|
dev_err(&pdev->dev, "Failed to deassert the reset line\n");
|
goto err_cleanup;
|
}
|
|
dev_info(&pdev->dev, "Probe done\n");
|
|
platform_set_drvdata(pdev, dcmi);
|
|
pm_runtime_enable(&pdev->dev);
|
|
return 0;
|
|
err_cleanup:
|
v4l2_async_notifier_cleanup(&dcmi->notifier);
|
err_media_entity_cleanup:
|
media_entity_cleanup(&dcmi->vdev->entity);
|
err_device_release:
|
video_device_release(dcmi->vdev);
|
err_device_unregister:
|
v4l2_device_unregister(&dcmi->v4l2_dev);
|
err_media_device_cleanup:
|
media_device_cleanup(&dcmi->mdev);
|
dma_release_channel(dcmi->dma_chan);
|
|
return ret;
|
}
|
|
static int dcmi_remove(struct platform_device *pdev)
|
{
|
struct stm32_dcmi *dcmi = platform_get_drvdata(pdev);
|
|
pm_runtime_disable(&pdev->dev);
|
|
v4l2_async_notifier_unregister(&dcmi->notifier);
|
v4l2_async_notifier_cleanup(&dcmi->notifier);
|
media_entity_cleanup(&dcmi->vdev->entity);
|
v4l2_device_unregister(&dcmi->v4l2_dev);
|
media_device_cleanup(&dcmi->mdev);
|
|
dma_release_channel(dcmi->dma_chan);
|
|
return 0;
|
}
|
|
static __maybe_unused int dcmi_runtime_suspend(struct device *dev)
|
{
|
struct stm32_dcmi *dcmi = dev_get_drvdata(dev);
|
|
clk_disable_unprepare(dcmi->mclk);
|
|
return 0;
|
}
|
|
static __maybe_unused int dcmi_runtime_resume(struct device *dev)
|
{
|
struct stm32_dcmi *dcmi = dev_get_drvdata(dev);
|
int ret;
|
|
ret = clk_prepare_enable(dcmi->mclk);
|
if (ret)
|
dev_err(dev, "%s: Failed to prepare_enable clock\n", __func__);
|
|
return ret;
|
}
|
|
static __maybe_unused int dcmi_suspend(struct device *dev)
|
{
|
/* disable clock */
|
pm_runtime_force_suspend(dev);
|
|
/* change pinctrl state */
|
pinctrl_pm_select_sleep_state(dev);
|
|
return 0;
|
}
|
|
static __maybe_unused int dcmi_resume(struct device *dev)
|
{
|
/* restore pinctl default state */
|
pinctrl_pm_select_default_state(dev);
|
|
/* clock enable */
|
pm_runtime_force_resume(dev);
|
|
return 0;
|
}
|
|
static const struct dev_pm_ops dcmi_pm_ops = {
|
SET_SYSTEM_SLEEP_PM_OPS(dcmi_suspend, dcmi_resume)
|
SET_RUNTIME_PM_OPS(dcmi_runtime_suspend,
|
dcmi_runtime_resume, NULL)
|
};
|
|
static struct platform_driver stm32_dcmi_driver = {
|
.probe = dcmi_probe,
|
.remove = dcmi_remove,
|
.driver = {
|
.name = DRV_NAME,
|
.of_match_table = of_match_ptr(stm32_dcmi_of_match),
|
.pm = &dcmi_pm_ops,
|
},
|
};
|
|
module_platform_driver(stm32_dcmi_driver);
|
|
MODULE_AUTHOR("Yannick Fertre <yannick.fertre@st.com>");
|
MODULE_AUTHOR("Hugues Fruchet <hugues.fruchet@st.com>");
|
MODULE_DESCRIPTION("STMicroelectronics STM32 Digital Camera Memory Interface driver");
|
MODULE_LICENSE("GPL");
|
MODULE_SUPPORTED_DEVICE("video");
|
