kernel/drivers/gpu/drm/sti/sti_drm_crtc.c

   1 /*
   2  * Copyright (C) STMicroelectronics SA 2014
   3  * Authors: Benjamin Gaignard <benjamin.gaignard@st.com>
   4  *          Fabien Dessenne <fabien.dessenne@st.com>
   5  *          for STMicroelectronics.
   6  * License terms:  GNU General Public License (GPL), version 2
   7  */
   8
   9 #include <linux/clk.h>
  10
  11 #include <drm/drmP.h>
  12 #include <drm/drm_atomic.h>
  13 #include <drm/drm_atomic_helper.h>
  14 #include <drm/drm_crtc_helper.h>
  15 #include <drm/drm_plane_helper.h>
  16
  17 #include "sti_compositor.h"
  18 #include "sti_drm_drv.h"
  19 #include "sti_drm_crtc.h"
  20 #include "sti_vtg.h"
  21
  22 static void sti_drm_crtc_dpms(struct drm_crtc *crtc, int mode)
  23 {
  24         DRM_DEBUG_KMS("\n");
  25 }
  26
  27 static void sti_drm_crtc_prepare(struct drm_crtc *crtc)
  28 {
  29         struct sti_mixer *mixer = to_sti_mixer(crtc);
  30         struct device *dev = mixer->dev;
  31         struct sti_compositor *compo = dev_get_drvdata(dev);
  32
  33         mixer->enabled = true;
  34
  35         /* Prepare and enable the compo IP clock */
  36         if (mixer->id == STI_MIXER_MAIN) {
  37                 if (clk_prepare_enable(compo->clk_compo_main))
  38                         DRM_INFO("Failed to prepare/enable compo_main clk\n");
  39         } else {
  40                 if (clk_prepare_enable(compo->clk_compo_aux))
  41                         DRM_INFO("Failed to prepare/enable compo_aux clk\n");
  42         }
  43
  44         sti_mixer_clear_all_layers(mixer);
  45 }
  46
  47 static void sti_drm_crtc_commit(struct drm_crtc *crtc)
  48 {
  49         struct sti_mixer *mixer = to_sti_mixer(crtc);
  50         struct device *dev = mixer->dev;
  51         struct sti_compositor *compo = dev_get_drvdata(dev);
  52         struct sti_layer *layer;
  53
  54         if ((!mixer || !compo)) {
  55                 DRM_ERROR("Can not find mixer or compositor)\n");
  56                 return;
  57         }
  58
  59         /* get GDP which is reserved to the CRTC FB */
  60         layer = to_sti_layer(crtc->primary);
  61         if (layer)
  62                 sti_layer_commit(layer);
  63         else
  64                 DRM_ERROR("Can not find CRTC dedicated plane (GDP0)\n");
  65
  66         /* Enable layer on mixer */
  67         if (sti_mixer_set_layer_status(mixer, layer, true))
  68                 DRM_ERROR("Can not enable layer at mixer\n");
  69
  70         drm_crtc_vblank_on(crtc);
  71 }
  72
  73 static bool sti_drm_crtc_mode_fixup(struct drm_crtc *crtc,
  74                                     const struct drm_display_mode *mode,
  75                                     struct drm_display_mode *adjusted_mode)
  76 {
  77         /* accept the provided drm_display_mode, do not fix it up */
  78         return true;
  79 }
  80
  81 static int
  82 sti_drm_crtc_mode_set(struct drm_crtc *crtc, struct drm_display_mode *mode)
  83 {
  84         struct sti_mixer *mixer = to_sti_mixer(crtc);
  85         struct device *dev = mixer->dev;
  86         struct sti_compositor *compo = dev_get_drvdata(dev);
  87         struct clk *clk;
  88         int rate = mode->clock * 1000;
  89         int res;
  90
  91         DRM_DEBUG_KMS("CRTC:%d (%s) mode:%d (%s)\n",
  92                       crtc->base.id, sti_mixer_to_str(mixer),
  93                       mode->base.id, mode->name);
  94
  95         DRM_DEBUG_KMS("%d %d %d %d %d %d %d %d %d %d 0x%x 0x%x\n",
  96                       mode->vrefresh, mode->clock,
  97                       mode->hdisplay,
  98                       mode->hsync_start, mode->hsync_end,
  99                       mode->htotal,
 100                       mode->vdisplay,
 101                       mode->vsync_start, mode->vsync_end,
 102                       mode->vtotal, mode->type, mode->flags);
 103
 104         /* Set rate and prepare/enable pixel clock */
 105         if (mixer->id == STI_MIXER_MAIN)
 106                 clk = compo->clk_pix_main;
 107         else
 108                 clk = compo->clk_pix_aux;
 109
 110         res = clk_set_rate(clk, rate);
 111         if (res < 0) {
 112                 DRM_ERROR("Cannot set rate (%dHz) for pix clk\n", rate);
 113                 return -EINVAL;
 114         }
 115         if (clk_prepare_enable(clk)) {
 116                 DRM_ERROR("Failed to prepare/enable pix clk\n");
 117                 return -EINVAL;
 118         }
 119
 120         sti_vtg_set_config(mixer->id == STI_MIXER_MAIN ?
 121                         compo->vtg_main : compo->vtg_aux, &crtc->mode);
 122
 123         res = sti_mixer_active_video_area(mixer, &crtc->mode);
 124         if (res) {
 125                 DRM_ERROR("Can not set active video area\n");
 126                 return -EINVAL;
 127         }
 128
 129         return res;
 130 }
 131
 132 static void sti_drm_crtc_disable(struct drm_crtc *crtc)
 133 {
 134         struct sti_mixer *mixer = to_sti_mixer(crtc);
 135         struct device *dev = mixer->dev;
 136         struct sti_compositor *compo = dev_get_drvdata(dev);
 137
 138         if (!mixer->enabled)
 139                 return;
 140
 141         DRM_DEBUG_KMS("CRTC:%d (%s)\n", crtc->base.id, sti_mixer_to_str(mixer));
 142
 143         /* Disable Background */
 144         sti_mixer_set_background_status(mixer, false);
 145
 146         drm_crtc_vblank_off(crtc);
 147
 148         /* Disable pixel clock and compo IP clocks */
 149         if (mixer->id == STI_MIXER_MAIN) {
 150                 clk_disable_unprepare(compo->clk_pix_main);
 151                 clk_disable_unprepare(compo->clk_compo_main);
 152         } else {
 153                 clk_disable_unprepare(compo->clk_pix_aux);
 154                 clk_disable_unprepare(compo->clk_compo_aux);
 155         }
 156
 157         mixer->enabled = false;
 158 }
 159
 160 static void
 161 sti_drm_crtc_mode_set_nofb(struct drm_crtc *crtc)
 162 {
 163         sti_drm_crtc_prepare(crtc);
 164         sti_drm_crtc_mode_set(crtc, &crtc->state->adjusted_mode);
 165 }
 166
 167 static void sti_drm_atomic_begin(struct drm_crtc *crtc)
 168 {
 169         struct sti_mixer *mixer = to_sti_mixer(crtc);
 170
 171         if (crtc->state->event) {
 172                 crtc->state->event->pipe = drm_crtc_index(crtc);
 173
 174                 WARN_ON(drm_crtc_vblank_get(crtc) != 0);
 175
 176                 mixer->pending_event = crtc->state->event;
 177                 crtc->state->event = NULL;
 178         }
 179 }
 180
 181 static void sti_drm_atomic_flush(struct drm_crtc *crtc)
 182 {
 183 }
 184
 185 static struct drm_crtc_helper_funcs sti_crtc_helper_funcs = {
 186         .dpms = sti_drm_crtc_dpms,
 187         .prepare = sti_drm_crtc_prepare,
 188         .commit = sti_drm_crtc_commit,
 189         .mode_fixup = sti_drm_crtc_mode_fixup,
 190         .mode_set = drm_helper_crtc_mode_set,
 191         .mode_set_nofb = sti_drm_crtc_mode_set_nofb,
 192         .mode_set_base = drm_helper_crtc_mode_set_base,
 193         .disable = sti_drm_crtc_disable,
 194         .atomic_begin = sti_drm_atomic_begin,
 195         .atomic_flush = sti_drm_atomic_flush,
 196 };
 197
 198 static void sti_drm_crtc_destroy(struct drm_crtc *crtc)
 199 {
 200         DRM_DEBUG_KMS("\n");
 201         drm_crtc_cleanup(crtc);
 202 }
 203
 204 static int sti_drm_crtc_set_property(struct drm_crtc *crtc,
 205                                      struct drm_property *property,
 206                                      uint64_t val)
 207 {
 208         DRM_DEBUG_KMS("\n");
 209         return 0;
 210 }
 211
 212 int sti_drm_crtc_vblank_cb(struct notifier_block *nb,
 213                            unsigned long event, void *data)
 214 {
 215         struct drm_device *drm_dev;
 216         struct sti_compositor *compo =
 217                 container_of(nb, struct sti_compositor, vtg_vblank_nb);
 218         int *crtc = data;
 219         unsigned long flags;
 220         struct sti_drm_private *priv;
 221
 222         drm_dev = compo->mixer[*crtc]->drm_crtc.dev;
 223         priv = drm_dev->dev_private;
 224
 225         if ((event != VTG_TOP_FIELD_EVENT) &&
 226             (event != VTG_BOTTOM_FIELD_EVENT)) {
 227                 DRM_ERROR("unknown event: %lu\n", event);
 228                 return -EINVAL;
 229         }
 230
 231         drm_handle_vblank(drm_dev, *crtc);
 232
 233         spin_lock_irqsave(&drm_dev->event_lock, flags);
 234         if (compo->mixer[*crtc]->pending_event) {
 235                 drm_send_vblank_event(drm_dev, -1,
 236                                 compo->mixer[*crtc]->pending_event);
 237                 drm_vblank_put(drm_dev, *crtc);
 238                 compo->mixer[*crtc]->pending_event = NULL;
 239         }
 240         spin_unlock_irqrestore(&drm_dev->event_lock, flags);
 241
 242         return 0;
 243 }
 244
 245 int sti_drm_crtc_enable_vblank(struct drm_device *dev, int crtc)
 246 {
 247         struct sti_drm_private *dev_priv = dev->dev_private;
 248         struct sti_compositor *compo = dev_priv->compo;
 249         struct notifier_block *vtg_vblank_nb = &compo->vtg_vblank_nb;
 250
 251         if (sti_vtg_register_client(crtc == STI_MIXER_MAIN ?
 252                         compo->vtg_main : compo->vtg_aux,
 253                         vtg_vblank_nb, crtc)) {
 254                 DRM_ERROR("Cannot register VTG notifier\n");
 255                 return -EINVAL;
 256         }
 257
 258         return 0;
 259 }
 260 EXPORT_SYMBOL(sti_drm_crtc_enable_vblank);
 261
 262 void sti_drm_crtc_disable_vblank(struct drm_device *dev, int crtc)
 263 {
 264         struct sti_drm_private *priv = dev->dev_private;
 265         struct sti_compositor *compo = priv->compo;
 266         struct notifier_block *vtg_vblank_nb = &compo->vtg_vblank_nb;
 267
 268         DRM_DEBUG_DRIVER("\n");
 269
 270         if (sti_vtg_unregister_client(crtc == STI_MIXER_MAIN ?
 271                         compo->vtg_main : compo->vtg_aux, vtg_vblank_nb))
 272                 DRM_DEBUG_DRIVER("Warning: cannot unregister VTG notifier\n");
 273
 274         /* free the resources of the pending requests */
 275         if (compo->mixer[crtc]->pending_event) {
 276                 drm_vblank_put(dev, crtc);
 277                 compo->mixer[crtc]->pending_event = NULL;
 278         }
 279 }
 280 EXPORT_SYMBOL(sti_drm_crtc_disable_vblank);
 281
 282 static struct drm_crtc_funcs sti_crtc_funcs = {
 283         .set_config = drm_atomic_helper_set_config,
 284         .page_flip = drm_atomic_helper_page_flip,
 285         .destroy = sti_drm_crtc_destroy,
 286         .set_property = sti_drm_crtc_set_property,
 287         .reset = drm_atomic_helper_crtc_reset,
 288         .atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
 289         .atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
 290 };
 291
 292 bool sti_drm_crtc_is_main(struct drm_crtc *crtc)
 293 {
 294         struct sti_mixer *mixer = to_sti_mixer(crtc);
 295
 296         if (mixer->id == STI_MIXER_MAIN)
 297                 return true;
 298
 299         return false;
 300 }
 301 EXPORT_SYMBOL(sti_drm_crtc_is_main);
 302
 303 int sti_drm_crtc_init(struct drm_device *drm_dev, struct sti_mixer *mixer,
 304                 struct drm_plane *primary, struct drm_plane *cursor)
 305 {
 306         struct drm_crtc *crtc = &mixer->drm_crtc;
 307         int res;
 308
 309         res = drm_crtc_init_with_planes(drm_dev, crtc, primary, cursor,
 310                         &sti_crtc_funcs);
 311         if (res) {
 312                 DRM_ERROR("Can not initialze CRTC\n");
 313                 return -EINVAL;
 314         }
 315
 316         drm_crtc_helper_add(crtc, &sti_crtc_helper_funcs);
 317
 318         DRM_DEBUG_DRIVER("drm CRTC:%d mapped to %s\n",
 319                          crtc->base.id, sti_mixer_to_str(mixer));
 320
 321         return 0;
 322 }