LXR linux/drivers/gpu/drm/tilcdc/tilcdc

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * Copyright (C) 2015 Texas Instruments
   4 * Author: Jyri Sarha <jsarha@ti.com>
   5 */
   6
   7#include <drm/drm_atomic.h>
   8#include <drm/drm_plane_helper.h>
   9#include <drm/drm_atomic_helper.h>
  10#include <drm/drm_fourcc.h>
  11
  12#include "tilcdc_drv.h"
  13
  14static const struct drm_plane_funcs tilcdc_plane_funcs = {
  15        .update_plane   = drm_atomic_helper_update_plane,
  16        .disable_plane  = drm_atomic_helper_disable_plane,
  17        .destroy        = drm_plane_cleanup,
  18        .reset          = drm_atomic_helper_plane_reset,
  19        .atomic_duplicate_state = drm_atomic_helper_plane_duplicate_state,
  20        .atomic_destroy_state = drm_atomic_helper_plane_destroy_state,
  21};
  22
  23static int tilcdc_plane_atomic_check(struct drm_plane *plane,
  24                                     struct drm_atomic_state *state)
  25{
  26        struct drm_plane_state *new_state = drm_atomic_get_new_plane_state(state,
  27                                                                           plane);
  28        struct drm_crtc_state *crtc_state;
  29        struct drm_plane_state *old_state = drm_atomic_get_old_plane_state(state,
  30                                                                           plane);
  31        unsigned int pitch;
  32
  33        if (!new_state->crtc)
  34                return 0;
  35
  36        if (WARN_ON(!new_state->fb))
  37                return -EINVAL;
  38
  39        if (new_state->crtc_x || new_state->crtc_y) {
  40                dev_err(plane->dev->dev, "%s: crtc position must be zero.",
  41                        __func__);
  42                return -EINVAL;
  43        }
  44
  45        crtc_state = drm_atomic_get_existing_crtc_state(state,
  46                                                        new_state->crtc);
  47        /* we should have a crtc state if the plane is attached to a crtc */
  48        if (WARN_ON(!crtc_state))
  49                return 0;
  50
  51        if (crtc_state->mode.hdisplay != new_state->crtc_w ||
  52            crtc_state->mode.vdisplay != new_state->crtc_h) {
  53                dev_err(plane->dev->dev,
  54                        "%s: Size must match mode (%dx%d == %dx%d)", __func__,
  55                        crtc_state->mode.hdisplay, crtc_state->mode.vdisplay,
  56                        new_state->crtc_w, new_state->crtc_h);
  57                return -EINVAL;
  58        }
  59
  60        pitch = crtc_state->mode.hdisplay *
  61                new_state->fb->format->cpp[0];
  62        if (new_state->fb->pitches[0] != pitch) {
  63                dev_err(plane->dev->dev,
  64                        "Invalid pitch: fb and crtc widths must be the same");
  65                return -EINVAL;
  66        }
  67
  68        if (old_state->fb && new_state->fb->format != old_state->fb->format) {
  69                dev_dbg(plane->dev->dev,
  70                        "%s(): pixel format change requires mode_change\n",
  71                        __func__);
  72                crtc_state->mode_changed = true;
  73        }
  74
  75        return 0;
  76}
  77
  78static void tilcdc_plane_atomic_update(struct drm_plane *plane,
  79                                       struct drm_atomic_state *state)
  80{
  81        struct drm_plane_state *new_state = drm_atomic_get_new_plane_state(state,
  82                                                                           plane);
  83
  84        if (!new_state->crtc)
  85                return;
  86
  87        if (WARN_ON(!new_state->fb || !new_state->crtc->state))
  88                return;
  89
  90        if (tilcdc_crtc_update_fb(new_state->crtc,
  91                                  new_state->fb,
  92                                  new_state->crtc->state->event) == 0) {
  93                new_state->crtc->state->event = NULL;
  94        }
  95}
  96
  97static const struct drm_plane_helper_funcs plane_helper_funcs = {
  98        .atomic_check = tilcdc_plane_atomic_check,
  99        .atomic_update = tilcdc_plane_atomic_update,
 100};
 101
 102int tilcdc_plane_init(struct drm_device *dev,
 103                      struct drm_plane *plane)
 104{
 105        struct tilcdc_drm_private *priv = dev->dev_private;
 106        int ret;
 107
 108        ret = drm_plane_init(dev, plane, 1,
 109                             &tilcdc_plane_funcs,
 110                             priv->pixelformats,
 111                             priv->num_pixelformats,
 112                             true);
 113        if (ret) {
 114                dev_err(dev->dev, "Failed to initialize plane: %d\n", ret);
 115                return ret;
 116        }
 117
 118        drm_plane_helper_add(plane, &plane_helper_funcs);
 119
 120        return 0;
 121}
 122