drivers/gpu/drm/tilcdc/tilcdc_plane.c

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