Quelle  exynos_drm_crtc.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0-or-later
/* exynos_drm_crtc.c
 *
 * Copyright (c) 2011 Samsung Electronics Co., Ltd.
 * Authors:
 * Inki Dae <inki.dae@samsung.com>
 * Joonyoung Shim <jy0922.shim@samsung.com>
 * Seung-Woo Kim <sw0312.kim@samsung.com>
 */

#include <drm/drm_atomic.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_encoder.h>
#include <drm/drm_probe_helper.h>
#include <drm/drm_vblank.h>

#include "exynos_drm_crtc.h"
#include "exynos_drm_drv.h"
#include "exynos_drm_plane.h"

static void exynos_drm_crtc_atomic_enable(struct drm_crtc *crtc,
       struct drm_atomic_state *state)
{
 struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);

 if (exynos_crtc->ops->atomic_enable)
  exynos_crtc->ops->atomic_enable(exynos_crtc);

 drm_crtc_vblank_on(crtc);
}

static void exynos_drm_crtc_atomic_disable(struct drm_crtc *crtc,
        struct drm_atomic_state *state)
{
 struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);

 drm_crtc_vblank_off(crtc);

 if (exynos_crtc->ops->atomic_disable)
  exynos_crtc->ops->atomic_disable(exynos_crtc);

 spin_lock_irq(&crtc->dev->event_lock);
 if (crtc->state->event && !crtc->state->active) {
  drm_crtc_send_vblank_event(crtc, crtc->state->event);
  crtc->state->event = NULL;
 }
 spin_unlock_irq(&crtc->dev->event_lock);
}

static int exynos_crtc_atomic_check(struct drm_crtc *crtc,
         struct drm_atomic_state *state)
{
 struct drm_crtc_state *crtc_state = drm_atomic_get_new_crtc_state(state,
           crtc);
 struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);

 if (!crtc_state->enable)
  return 0;

 if (exynos_crtc->ops->atomic_check)
  return exynos_crtc->ops->atomic_check(exynos_crtc, crtc_state);

 return 0;
}

static void exynos_crtc_atomic_begin(struct drm_crtc *crtc,
         struct drm_atomic_state *state)
{
 struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);

 if (exynos_crtc->ops->atomic_begin)
  exynos_crtc->ops->atomic_begin(exynos_crtc);
}

static void exynos_crtc_atomic_flush(struct drm_crtc *crtc,
         struct drm_atomic_state *state)
{
 struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);

 if (exynos_crtc->ops->atomic_flush)
  exynos_crtc->ops->atomic_flush(exynos_crtc);
}

static enum drm_mode_status exynos_crtc_mode_valid(struct drm_crtc *crtc,
 const struct drm_display_mode *mode)
{
 struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);

 if (exynos_crtc->ops->mode_valid)
  return exynos_crtc->ops->mode_valid(exynos_crtc, mode);

 return MODE_OK;
}

static bool exynos_crtc_mode_fixup(struct drm_crtc *crtc,
  const struct drm_display_mode *mode,
  struct drm_display_mode *adjusted_mode)
{
 struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);

 if (exynos_crtc->ops->mode_fixup)
  return exynos_crtc->ops->mode_fixup(exynos_crtc, mode,
    adjusted_mode);

 return true;
}


static const struct drm_crtc_helper_funcs exynos_crtc_helper_funcs = {
 .mode_valid = exynos_crtc_mode_valid,
 .mode_fixup = exynos_crtc_mode_fixup,
 .atomic_check = exynos_crtc_atomic_check,
 .atomic_begin = exynos_crtc_atomic_begin,
 .atomic_flush = exynos_crtc_atomic_flush,
 .atomic_enable = exynos_drm_crtc_atomic_enable,
 .atomic_disable = exynos_drm_crtc_atomic_disable,
};

void exynos_crtc_handle_event(struct exynos_drm_crtc *exynos_crtc)
{
 struct drm_crtc *crtc = &exynos_crtc->base;
 struct drm_pending_vblank_event *event = crtc->state->event;
 unsigned long flags;

 if (!event)
  return;
 crtc->state->event = NULL;

 WARN_ON(drm_crtc_vblank_get(crtc) != 0);

 spin_lock_irqsave(&crtc->dev->event_lock, flags);
 drm_crtc_arm_vblank_event(crtc, event);
 spin_unlock_irqrestore(&crtc->dev->event_lock, flags);
}

static void exynos_drm_crtc_destroy(struct drm_crtc *crtc)
{
 struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);

 drm_crtc_cleanup(crtc);
 kfree(exynos_crtc);
}

static int exynos_drm_crtc_enable_vblank(struct drm_crtc *crtc)
{
 struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);

 if (exynos_crtc->ops->enable_vblank)
  return exynos_crtc->ops->enable_vblank(exynos_crtc);

 return 0;
}

static void exynos_drm_crtc_disable_vblank(struct drm_crtc *crtc)
{
 struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);

 if (exynos_crtc->ops->disable_vblank)
  exynos_crtc->ops->disable_vblank(exynos_crtc);
}

static const struct drm_crtc_funcs exynos_crtc_funcs = {
 .set_config = drm_atomic_helper_set_config,
 .page_flip = drm_atomic_helper_page_flip,
 .destroy = exynos_drm_crtc_destroy,
 .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 = exynos_drm_crtc_enable_vblank,
 .disable_vblank = exynos_drm_crtc_disable_vblank,
};

struct exynos_drm_crtc *exynos_drm_crtc_create(struct drm_device *drm_dev,
     struct drm_plane *plane,
     enum exynos_drm_output_type type,
     const struct exynos_drm_crtc_ops *ops,
     void *ctx)
{
 struct exynos_drm_crtc *exynos_crtc;
 struct drm_crtc *crtc;
 int ret;

 exynos_crtc = kzalloc(sizeof(*exynos_crtc), GFP_KERNEL);
 if (!exynos_crtc)
  return ERR_PTR(-ENOMEM);

 exynos_crtc->type = type;
 exynos_crtc->ops = ops;
 exynos_crtc->ctx = ctx;

 crtc = &exynos_crtc->base;

 ret = drm_crtc_init_with_planes(drm_dev, crtc, plane, NULL,
     &exynos_crtc_funcs, NULL);
 if (ret < 0)
  goto err_crtc;

 drm_crtc_helper_add(crtc, &exynos_crtc_helper_funcs);

 return exynos_crtc;

err_crtc:
 plane->funcs->destroy(plane);
 kfree(exynos_crtc);
 return ERR_PTR(ret);
}

struct exynos_drm_crtc *exynos_drm_crtc_get_by_type(struct drm_device *drm_dev,
           enum exynos_drm_output_type out_type)
{
 struct drm_crtc *crtc;

 drm_for_each_crtc(crtc, drm_dev)
  if (to_exynos_crtc(crtc)->type == out_type)
   return to_exynos_crtc(crtc);

 return ERR_PTR(-ENODEV);
}

int exynos_drm_set_possible_crtcs(struct drm_encoder *encoder,
  enum exynos_drm_output_type out_type)
{
 struct exynos_drm_crtc *crtc = exynos_drm_crtc_get_by_type(encoder->dev,
      out_type);

 if (IS_ERR(crtc))
  return PTR_ERR(crtc);

 encoder->possible_crtcs = drm_crtc_mask(&crtc->base);

 return 0;
}

void exynos_drm_crtc_te_handler(struct drm_crtc *crtc)
{
 struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);

 if (exynos_crtc->ops->te_handler)
  exynos_crtc->ops->te_handler(exynos_crtc);
}