add ip1811 driver

hc

2023-11-22 9ca5fbcb63a8dcaee0527f96afb91dc4b4bd8fa9

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// SPDX-License-Identifier: GPL-2.0+
 
#include "vkms_drv.h"
#include <drm/drm_atomic_helper.h>
#include <drm/drm_crtc_helper.h>
 
static enum hrtimer_restart vkms_vblank_simulate(struct hrtimer *timer)
{
    struct vkms_output *output = container_of(timer, struct vkms_output,
                          vblank_hrtimer);
    struct drm_crtc *crtc = &output->crtc;
    int ret_overrun;
    bool ret;
 
    ret = drm_crtc_handle_vblank(crtc);
    if (!ret)
        DRM_ERROR("vkms failure on handling vblank");
 
    ret_overrun = hrtimer_forward_now(&output->vblank_hrtimer,
                      output->period_ns);
 
    return HRTIMER_RESTART;
}
 
static int vkms_enable_vblank(struct drm_crtc *crtc)
{
    struct drm_device *dev = crtc->dev;
    unsigned int pipe = drm_crtc_index(crtc);
    struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
    struct vkms_output *out = drm_crtc_to_vkms_output(crtc);
 
    drm_calc_timestamping_constants(crtc, &crtc->mode);
 
    hrtimer_init(&out->vblank_hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
    out->vblank_hrtimer.function = &vkms_vblank_simulate;
    out->period_ns = ktime_set(0, vblank->framedur_ns);
    hrtimer_start(&out->vblank_hrtimer, out->period_ns, HRTIMER_MODE_REL);
 
    return 0;
}
 
static void vkms_disable_vblank(struct drm_crtc *crtc)
{
    struct vkms_output *out = drm_crtc_to_vkms_output(crtc);
 
    hrtimer_cancel(&out->vblank_hrtimer);
}
 
bool vkms_get_vblank_timestamp(struct drm_device *dev, unsigned int pipe,
                   int *max_error, ktime_t *vblank_time,
                   bool in_vblank_irq)
{
    struct vkms_device *vkmsdev = drm_device_to_vkms_device(dev);
    struct vkms_output *output = &vkmsdev->output;
 
    *vblank_time = output->vblank_hrtimer.node.expires;
 
    if (!in_vblank_irq)
        *vblank_time -= output->period_ns;
 
    return true;
}
 
static const struct drm_crtc_funcs vkms_crtc_funcs = {
    .set_config             = drm_atomic_helper_set_config,
    .destroy                = drm_crtc_cleanup,
    .page_flip              = drm_atomic_helper_page_flip,
    .reset                  = drm_atomic_helper_crtc_reset,
    .atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
    .atomic_destroy_state   = drm_atomic_helper_crtc_destroy_state,
    .enable_vblank        = vkms_enable_vblank,
    .disable_vblank        = vkms_disable_vblank,
};
 
static void vkms_crtc_atomic_enable(struct drm_crtc *crtc,
                    struct drm_crtc_state *old_state)
{
    drm_crtc_vblank_on(crtc);
}
 
static void vkms_crtc_atomic_disable(struct drm_crtc *crtc,
                     struct drm_crtc_state *old_state)
{
    drm_crtc_vblank_off(crtc);
}
 
static void vkms_crtc_atomic_flush(struct drm_crtc *crtc,
                   struct drm_crtc_state *old_crtc_state)
{
    unsigned long flags;
 
    if (crtc->state->event) {
        spin_lock_irqsave(&crtc->dev->event_lock, flags);
 
        if (drm_crtc_vblank_get(crtc) != 0)
            drm_crtc_send_vblank_event(crtc, crtc->state->event);
        else
            drm_crtc_arm_vblank_event(crtc, crtc->state->event);
 
        spin_unlock_irqrestore(&crtc->dev->event_lock, flags);
 
        crtc->state->event = NULL;
    }
}
 
static const struct drm_crtc_helper_funcs vkms_crtc_helper_funcs = {
    .atomic_flush    = vkms_crtc_atomic_flush,
    .atomic_enable    = vkms_crtc_atomic_enable,
    .atomic_disable    = vkms_crtc_atomic_disable,
};
 
int vkms_crtc_init(struct drm_device *dev, struct drm_crtc *crtc,
           struct drm_plane *primary, struct drm_plane *cursor)
{
    int ret;
 
    ret = drm_crtc_init_with_planes(dev, crtc, primary, cursor,
                    &vkms_crtc_funcs, NULL);
    if (ret) {
        DRM_ERROR("Failed to init CRTC\n");
        return ret;
    }
 
    drm_crtc_helper_add(crtc, &vkms_crtc_helper_funcs);
 
    return ret;
}