// SPDX-License-Identifier: GPL-2.0
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/*
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* Rockchip MIPI CSI2 DPHY driver
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*
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* Copyright (C) 2021 Rockchip Electronics Co., Ltd.
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*/
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#include <linux/clk.h>
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#include <linux/delay.h>
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#include <linux/io.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_graph.h>
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#include <linux/of_platform.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/regmap.h>
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#include <linux/mfd/syscon.h>
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#include <media/media-entity.h>
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#include <media/v4l2-ctrls.h>
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#include <media/v4l2-fwnode.h>
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#include <media/v4l2-subdev.h>
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#include <media/v4l2-device.h>
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#include "phy-rockchip-csi2-dphy-common.h"
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struct sensor_async_subdev {
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struct v4l2_async_subdev asd;
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struct v4l2_mbus_config mbus;
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int lanes;
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};
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static DEFINE_MUTEX(csi2dphy_dev_mutex);
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static LIST_HEAD(csi2dphy_device_list);
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static inline struct csi2_dphy *to_csi2_dphy(struct v4l2_subdev *subdev)
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{
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return container_of(subdev, struct csi2_dphy, sd);
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}
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static struct v4l2_subdev *get_remote_sensor(struct v4l2_subdev *sd)
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{
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struct media_pad *local, *remote;
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struct media_entity *sensor_me;
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local = &sd->entity.pads[CSI2_DPHY_RX_PAD_SINK];
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remote = media_entity_remote_pad(local);
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if (!remote) {
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v4l2_warn(sd, "No link between dphy and sensor\n");
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return NULL;
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}
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sensor_me = media_entity_remote_pad(local)->entity;
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return media_entity_to_v4l2_subdev(sensor_me);
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}
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static struct csi2_sensor *sd_to_sensor(struct csi2_dphy *dphy,
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struct v4l2_subdev *sd)
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{
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int i;
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for (i = 0; i < dphy->num_sensors; ++i)
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if (dphy->sensors[i].sd == sd)
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return &dphy->sensors[i];
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return NULL;
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}
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static int csi2_dphy_get_sensor_data_rate(struct v4l2_subdev *sd)
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{
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struct csi2_dphy *dphy = to_csi2_dphy(sd);
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struct v4l2_subdev *sensor_sd = get_remote_sensor(sd);
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struct v4l2_ctrl *link_freq;
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struct v4l2_querymenu qm = { .id = V4L2_CID_LINK_FREQ, };
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int ret;
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link_freq = v4l2_ctrl_find(sensor_sd->ctrl_handler, V4L2_CID_LINK_FREQ);
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if (!link_freq) {
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v4l2_warn(sd, "No pixel rate control in subdev\n");
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return -EPIPE;
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}
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qm.index = v4l2_ctrl_g_ctrl(link_freq);
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ret = v4l2_querymenu(sensor_sd->ctrl_handler, &qm);
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if (ret < 0) {
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v4l2_err(sd, "Failed to get menu item\n");
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return ret;
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}
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if (!qm.value) {
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v4l2_err(sd, "Invalid link_freq\n");
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return -EINVAL;
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}
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dphy->data_rate_mbps = qm.value * 2;
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do_div(dphy->data_rate_mbps, 1000 * 1000);
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v4l2_info(sd, "dphy%d, data_rate_mbps %lld\n",
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dphy->phy_index, dphy->data_rate_mbps);
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return 0;
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}
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static int csi2_dphy_update_sensor_mbus(struct v4l2_subdev *sd)
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{
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struct csi2_dphy *dphy = to_csi2_dphy(sd);
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struct v4l2_subdev *sensor_sd = get_remote_sensor(sd);
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struct csi2_sensor *sensor = sd_to_sensor(dphy, sensor_sd);
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struct v4l2_mbus_config mbus;
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int ret;
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ret = v4l2_subdev_call(sensor_sd, video, g_mbus_config, &mbus);
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if (ret)
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return ret;
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sensor->mbus = mbus;
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switch (mbus.flags & V4L2_MBUS_CSI2_LANES) {
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case V4L2_MBUS_CSI2_1_LANE:
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sensor->lanes = 1;
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break;
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case V4L2_MBUS_CSI2_2_LANE:
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sensor->lanes = 2;
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break;
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case V4L2_MBUS_CSI2_3_LANE:
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sensor->lanes = 3;
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break;
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case V4L2_MBUS_CSI2_4_LANE:
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sensor->lanes = 4;
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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static int csi2_dphy_s_stream_start(struct v4l2_subdev *sd)
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{
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struct csi2_dphy *dphy = to_csi2_dphy(sd);
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struct csi2_dphy_hw *hw = dphy->dphy_hw;
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int ret = 0;
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if (dphy->is_streaming)
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return 0;
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ret = csi2_dphy_get_sensor_data_rate(sd);
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if (ret < 0)
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return ret;
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csi2_dphy_update_sensor_mbus(sd);
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if (hw->stream_on)
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hw->stream_on(dphy, sd);
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dphy->is_streaming = true;
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return 0;
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}
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static int csi2_dphy_s_stream_stop(struct v4l2_subdev *sd)
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{
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struct csi2_dphy *dphy = to_csi2_dphy(sd);
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struct csi2_dphy_hw *hw = dphy->dphy_hw;
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if (!dphy->is_streaming)
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return 0;
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if (hw->stream_off)
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hw->stream_off(dphy, sd);
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dphy->is_streaming = false;
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dev_info(dphy->dev, "%s stream stop, dphy%d\n",
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__func__, dphy->phy_index);
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return 0;
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}
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static int csi2_dphy_s_stream(struct v4l2_subdev *sd, int on)
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{
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struct csi2_dphy *dphy = to_csi2_dphy(sd);
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int ret = 0;
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mutex_lock(&dphy->mutex);
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if (on)
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ret = csi2_dphy_s_stream_start(sd);
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else
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ret = csi2_dphy_s_stream_stop(sd);
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mutex_unlock(&dphy->mutex);
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dev_info(dphy->dev, "%s stream on:%d, dphy%d\n",
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__func__, on, dphy->phy_index);
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return ret;
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}
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static int csi2_dphy_g_frame_interval(struct v4l2_subdev *sd,
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struct v4l2_subdev_frame_interval *fi)
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{
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struct v4l2_subdev *sensor = get_remote_sensor(sd);
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if (sensor)
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return v4l2_subdev_call(sensor, video, g_frame_interval, fi);
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return -EINVAL;
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}
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static int csi2_dphy_g_mbus_config(struct v4l2_subdev *sd,
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struct v4l2_mbus_config *config)
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{
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struct csi2_dphy *dphy = to_csi2_dphy(sd);
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struct v4l2_subdev *sensor_sd = get_remote_sensor(sd);
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struct csi2_sensor *sensor;
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if (!sensor_sd)
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return -ENODEV;
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sensor = sd_to_sensor(dphy, sensor_sd);
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csi2_dphy_update_sensor_mbus(sd);
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*config = sensor->mbus;
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return 0;
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}
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static int csi2_dphy_s_power(struct v4l2_subdev *sd, int on)
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{
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struct csi2_dphy *dphy = to_csi2_dphy(sd);
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if (on)
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return pm_runtime_get_sync(dphy->dev);
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else
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return pm_runtime_put(dphy->dev);
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}
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static __maybe_unused int csi2_dphy_runtime_suspend(struct device *dev)
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{
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struct media_entity *me = dev_get_drvdata(dev);
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struct v4l2_subdev *sd = media_entity_to_v4l2_subdev(me);
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struct csi2_dphy *dphy = to_csi2_dphy(sd);
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struct csi2_dphy_hw *hw = dphy->dphy_hw;
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if (hw)
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clk_bulk_disable_unprepare(hw->num_clks, hw->clks);
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return 0;
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}
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static __maybe_unused int csi2_dphy_runtime_resume(struct device *dev)
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{
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struct media_entity *me = dev_get_drvdata(dev);
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struct v4l2_subdev *sd = media_entity_to_v4l2_subdev(me);
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struct csi2_dphy *dphy = to_csi2_dphy(sd);
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struct csi2_dphy_hw *hw = dphy->dphy_hw;
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int ret;
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if (hw) {
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ret = clk_bulk_prepare_enable(hw->num_clks, hw->clks);
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if (ret) {
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dev_err(hw->dev, "failed to enable clks\n");
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return ret;
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}
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}
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return 0;
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}
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/* dphy accepts all fmt/size from sensor */
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static int csi2_dphy_get_set_fmt(struct v4l2_subdev *sd,
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struct v4l2_subdev_pad_config *cfg,
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struct v4l2_subdev_format *fmt)
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{
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struct csi2_dphy *dphy = to_csi2_dphy(sd);
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struct v4l2_subdev *sensor_sd = get_remote_sensor(sd);
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struct csi2_sensor *sensor = sd_to_sensor(dphy, sensor_sd);
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int ret;
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/*
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* Do not allow format changes and just relay whatever
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* set currently in the sensor.
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*/
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if (!sensor_sd)
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return -ENODEV;
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ret = v4l2_subdev_call(sensor_sd, pad, get_fmt, NULL, fmt);
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if (!ret && fmt->pad == 0)
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sensor->format = fmt->format;
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return ret;
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}
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static int csi2_dphy_get_selection(struct v4l2_subdev *sd,
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struct v4l2_subdev_pad_config *cfg,
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struct v4l2_subdev_selection *sel)
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{
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struct v4l2_subdev *sensor = get_remote_sensor(sd);
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return v4l2_subdev_call(sensor, pad, get_selection, NULL, sel);
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}
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static const struct v4l2_subdev_core_ops csi2_dphy_core_ops = {
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.s_power = csi2_dphy_s_power,
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};
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static const struct v4l2_subdev_video_ops csi2_dphy_video_ops = {
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.g_frame_interval = csi2_dphy_g_frame_interval,
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.g_mbus_config = csi2_dphy_g_mbus_config,
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.s_stream = csi2_dphy_s_stream,
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};
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static const struct v4l2_subdev_pad_ops csi2_dphy_subdev_pad_ops = {
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.set_fmt = csi2_dphy_get_set_fmt,
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.get_fmt = csi2_dphy_get_set_fmt,
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.get_selection = csi2_dphy_get_selection,
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};
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static const struct v4l2_subdev_ops csi2_dphy_subdev_ops = {
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.core = &csi2_dphy_core_ops,
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.video = &csi2_dphy_video_ops,
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.pad = &csi2_dphy_subdev_pad_ops,
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};
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/* The .bound() notifier callback when a match is found */
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static int
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rockchip_csi2_dphy_notifier_bound(struct v4l2_async_notifier *notifier,
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struct v4l2_subdev *sd,
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struct v4l2_async_subdev *asd)
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{
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struct csi2_dphy *dphy = container_of(notifier,
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struct csi2_dphy,
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notifier);
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struct sensor_async_subdev *s_asd = container_of(asd,
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struct sensor_async_subdev, asd);
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struct csi2_sensor *sensor;
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unsigned int pad, ret;
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if (dphy->num_sensors == ARRAY_SIZE(dphy->sensors))
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return -EBUSY;
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sensor = &dphy->sensors[dphy->num_sensors++];
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sensor->lanes = s_asd->lanes;
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sensor->mbus = s_asd->mbus;
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sensor->sd = sd;
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dev_info(dphy->dev, "dphy%d matches %s:bus type %d\n",
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dphy->phy_index, sd->name, s_asd->mbus.type);
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for (pad = 0; pad < sensor->sd->entity.num_pads; pad++)
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if (sensor->sd->entity.pads[pad].flags & MEDIA_PAD_FL_SOURCE)
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break;
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if (pad == sensor->sd->entity.num_pads) {
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dev_err(dphy->dev,
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"failed to find src pad for %s\n",
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sensor->sd->name);
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return -ENXIO;
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}
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ret = media_create_pad_link(
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&sensor->sd->entity, pad,
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&dphy->sd.entity, CSI2_DPHY_RX_PAD_SINK,
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dphy->num_sensors != 1 ? 0 : MEDIA_LNK_FL_ENABLED);
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if (ret) {
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dev_err(dphy->dev,
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"failed to create link for %s\n",
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sensor->sd->name);
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return ret;
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}
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return 0;
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}
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/* The .unbind callback */
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static void
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rockchip_csi2_dphy_notifier_unbind(struct v4l2_async_notifier *notifier,
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struct v4l2_subdev *sd,
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struct v4l2_async_subdev *asd)
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{
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struct csi2_dphy *dphy = container_of(notifier,
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struct csi2_dphy,
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notifier);
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struct csi2_sensor *sensor = sd_to_sensor(dphy, sd);
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sensor->sd = NULL;
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}
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static const struct
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v4l2_async_notifier_operations rockchip_csi2_dphy_async_ops = {
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.bound = rockchip_csi2_dphy_notifier_bound,
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.unbind = rockchip_csi2_dphy_notifier_unbind,
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};
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static int rockchip_csi2_dphy_fwnode_parse(struct device *dev,
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struct v4l2_fwnode_endpoint *vep,
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struct v4l2_async_subdev *asd)
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{
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struct sensor_async_subdev *s_asd =
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container_of(asd, struct sensor_async_subdev, asd);
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struct v4l2_mbus_config *config = &s_asd->mbus;
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if (vep->base.port != 0) {
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dev_err(dev, "The PHY has only port 0\n");
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return -EINVAL;
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}
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if (vep->bus_type == V4L2_MBUS_CSI2) {
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config->type = V4L2_MBUS_CSI2;
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config->flags = vep->bus.mipi_csi2.flags;
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s_asd->lanes = vep->bus.mipi_csi2.num_data_lanes;
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} else {
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dev_err(dev, "Only CSI2 type is currently supported\n");
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return -EINVAL;
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}
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switch (s_asd->lanes) {
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case 1:
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config->flags |= V4L2_MBUS_CSI2_1_LANE;
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break;
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case 2:
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config->flags |= V4L2_MBUS_CSI2_2_LANE;
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break;
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case 3:
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config->flags |= V4L2_MBUS_CSI2_3_LANE;
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break;
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case 4:
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config->flags |= V4L2_MBUS_CSI2_4_LANE;
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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static int rockchip_csi2dphy_media_init(struct csi2_dphy *dphy)
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{
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int ret;
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dphy->pads[CSI2_DPHY_RX_PAD_SOURCE].flags =
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MEDIA_PAD_FL_SOURCE | MEDIA_PAD_FL_MUST_CONNECT;
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dphy->pads[CSI2_DPHY_RX_PAD_SINK].flags =
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MEDIA_PAD_FL_SINK | MEDIA_PAD_FL_MUST_CONNECT;
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dphy->sd.entity.function = MEDIA_ENT_F_VID_IF_BRIDGE;
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ret = media_entity_pads_init(&dphy->sd.entity,
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CSI2_DPHY_RX_PADS_NUM, dphy->pads);
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if (ret < 0)
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return ret;
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ret = v4l2_async_notifier_parse_fwnode_endpoints_by_port(
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dphy->dev, &dphy->notifier,
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sizeof(struct sensor_async_subdev), 0,
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rockchip_csi2_dphy_fwnode_parse);
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if (ret < 0)
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return ret;
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if (!dphy->notifier.num_subdevs)
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return -ENODEV; /* no endpoint */
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dphy->sd.subdev_notifier = &dphy->notifier;
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dphy->notifier.ops = &rockchip_csi2_dphy_async_ops;
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ret = v4l2_async_subdev_notifier_register(&dphy->sd, &dphy->notifier);
|
if (ret) {
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dev_err(dphy->dev,
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"failed to register async notifier : %d\n", ret);
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v4l2_async_notifier_cleanup(&dphy->notifier);
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return ret;
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}
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return v4l2_async_register_subdev(&dphy->sd);
|
}
|
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static int rockchip_csi2_dphy_attach_hw(struct csi2_dphy *dphy)
|
{
|
struct platform_device *plat_dev;
|
struct device *dev = dphy->dev;
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struct csi2_dphy_hw *dphy_hw;
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struct device_node *np;
|
enum csi2_dphy_lane_mode target_mode;
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int i;
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|
if (dphy->phy_index == 0)
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target_mode = LANE_MODE_FULL;
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else
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target_mode = LANE_MODE_SPLIT;
|
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np = of_parse_phandle(dev->of_node, "rockchip,hw", 0);
|
if (!np || !of_device_is_available(np)) {
|
dev_err(dphy->dev,
|
"failed to get dphy%d hw node\n", dphy->phy_index);
|
return -ENODEV;
|
}
|
|
plat_dev = of_find_device_by_node(np);
|
of_node_put(np);
|
if (!plat_dev) {
|
dev_err(dphy->dev,
|
"failed to get dphy%d hw from node\n",
|
dphy->phy_index);
|
return -ENODEV;
|
}
|
|
dphy_hw = platform_get_drvdata(plat_dev);
|
if (!dphy_hw) {
|
dev_err(dphy->dev,
|
"failed attach dphy%d hw\n",
|
dphy->phy_index);
|
return -EINVAL;
|
}
|
|
if (dphy_hw->lane_mode == LANE_MODE_UNDEF) {
|
dphy_hw->lane_mode = target_mode;
|
} else {
|
struct csi2_dphy *phy = dphy_hw->dphy_dev[0];
|
|
for (i = 0; i < dphy_hw->dphy_dev_num; i++) {
|
if (dphy_hw->dphy_dev[i]->lane_mode == dphy_hw->lane_mode) {
|
phy = dphy_hw->dphy_dev[i];
|
break;
|
}
|
}
|
|
if (target_mode != dphy_hw->lane_mode) {
|
dev_err(dphy->dev,
|
"Err:csi2 dphy hw has been set as %s mode by phy%d, target mode is:%s\n",
|
dphy_hw->lane_mode == LANE_MODE_FULL ? "full" : "split",
|
phy->phy_index,
|
target_mode == LANE_MODE_FULL ? "full" : "split");
|
return -ENODEV;
|
}
|
}
|
|
dphy_hw->dphy_dev[dphy_hw->dphy_dev_num] = dphy;
|
dphy_hw->dphy_dev_num++;
|
dphy->dphy_hw = dphy_hw;
|
|
return 0;
|
}
|
|
static int rockchip_csi2_dphy_detach_hw(struct csi2_dphy *dphy)
|
{
|
struct csi2_dphy_hw *dphy_hw = dphy->dphy_hw;
|
struct csi2_dphy *csi2_dphy = NULL;
|
int i;
|
|
for (i = 0; i < dphy_hw->dphy_dev_num; i++) {
|
csi2_dphy = dphy_hw->dphy_dev[i];
|
if (csi2_dphy &&
|
csi2_dphy->phy_index == dphy->phy_index) {
|
dphy_hw->dphy_dev[i] = NULL;
|
dphy_hw->dphy_dev_num--;
|
break;
|
}
|
}
|
|
return 0;
|
}
|
|
static const struct of_device_id rockchip_csi2_dphy_match_id[] = {
|
{
|
.compatible = "rockchip,rk3568-csi2-dphy",
|
},
|
{}
|
};
|
MODULE_DEVICE_TABLE(of, rockchip_csi2_dphy_match_id);
|
|
static int rockchip_csi2_dphy_probe(struct platform_device *pdev)
|
{
|
struct device *dev = &pdev->dev;
|
const struct of_device_id *of_id;
|
struct csi2_dphy *csi2dphy;
|
struct v4l2_subdev *sd;
|
int ret;
|
|
csi2dphy = devm_kzalloc(dev, sizeof(*csi2dphy), GFP_KERNEL);
|
if (!csi2dphy)
|
return -ENOMEM;
|
csi2dphy->dev = dev;
|
|
of_id = of_match_device(rockchip_csi2_dphy_match_id, dev);
|
if (!of_id)
|
return -EINVAL;
|
|
csi2dphy->phy_index = of_alias_get_id(dev->of_node, "csi2dphy");
|
if (csi2dphy->phy_index < 0 || csi2dphy->phy_index > 2)
|
csi2dphy->phy_index = 0;
|
|
ret = rockchip_csi2_dphy_attach_hw(csi2dphy);
|
if (ret) {
|
dev_err(dev,
|
"csi2 dphy hw can't be attached, register dphy%d failed!\n",
|
csi2dphy->phy_index);
|
return -ENODEV;
|
}
|
|
sd = &csi2dphy->sd;
|
mutex_init(&csi2dphy->mutex);
|
v4l2_subdev_init(sd, &csi2_dphy_subdev_ops);
|
sd->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
|
snprintf(sd->name, sizeof(sd->name),
|
"rockchip-csi2-dphy%d", csi2dphy->phy_index);
|
sd->dev = dev;
|
|
platform_set_drvdata(pdev, &sd->entity);
|
|
ret = rockchip_csi2dphy_media_init(csi2dphy);
|
if (ret < 0)
|
goto detach_hw;
|
|
pm_runtime_enable(&pdev->dev);
|
|
dev_info(dev, "csi2 dphy%d probe successfully!\n", csi2dphy->phy_index);
|
|
return 0;
|
|
detach_hw:
|
mutex_destroy(&csi2dphy->mutex);
|
rockchip_csi2_dphy_detach_hw(csi2dphy);
|
|
return 0;
|
}
|
|
static int rockchip_csi2_dphy_remove(struct platform_device *pdev)
|
{
|
struct media_entity *me = platform_get_drvdata(pdev);
|
struct v4l2_subdev *sd = media_entity_to_v4l2_subdev(me);
|
struct csi2_dphy *dphy = to_csi2_dphy(sd);
|
|
media_entity_cleanup(&sd->entity);
|
|
pm_runtime_disable(&pdev->dev);
|
mutex_destroy(&dphy->mutex);
|
return 0;
|
}
|
static int __maybe_unused __rockchip_csi2dphy_clr_unready_dev(void)
|
{
|
struct csi2_dphy *csi2dphy;
|
|
mutex_lock(&csi2dphy_dev_mutex);
|
list_for_each_entry(csi2dphy, &csi2dphy_device_list, list)
|
v4l2_async_notifier_clr_unready_dev(&csi2dphy->notifier);
|
mutex_unlock(&csi2dphy_dev_mutex);
|
|
return 0;
|
}
|
|
static int rockchip_csi2dphy_clr_unready_dev_param_set(const char *val,
|
const struct kernel_param *kp)
|
{
|
#ifdef MODULE
|
__rockchip_csi2dphy_clr_unready_dev();
|
#endif
|
|
return 0;
|
}
|
|
module_param_call(clr_unready_dev,
|
rockchip_csi2dphy_clr_unready_dev_param_set,
|
NULL, NULL, 0200);
|
MODULE_PARM_DESC(clr_unready_dev, "clear unready devices");
|
|
#ifndef MODULE
|
static int __init rockchip_csi2_dphy_clr_unready_dev(void)
|
{
|
__rockchip_csi2dphy_clr_unready_dev();
|
|
return 0;
|
}
|
late_initcall_sync(rockchip_csi2_dphy_clr_unready_dev);
|
#endif
|
|
static const struct dev_pm_ops rockchip_csi2_dphy_pm_ops = {
|
SET_RUNTIME_PM_OPS(csi2_dphy_runtime_suspend,
|
csi2_dphy_runtime_resume, NULL)
|
};
|
|
struct platform_driver rockchip_csi2_dphy_driver = {
|
.probe = rockchip_csi2_dphy_probe,
|
.remove = rockchip_csi2_dphy_remove,
|
.driver = {
|
.name = "rockchip-csi2-dphy",
|
.pm = &rockchip_csi2_dphy_pm_ops,
|
.of_match_table = rockchip_csi2_dphy_match_id,
|
},
|
};
|
EXPORT_SYMBOL(rockchip_csi2_dphy_driver);
|
|
MODULE_AUTHOR("Rockchip Camera/ISP team");
|
MODULE_DESCRIPTION("Rockchip MIPI CSI2 DPHY driver");
|
MODULE_LICENSE("GPL v2");
|
