drivers/staging/omapdrm/omap_crtc.c

   1 /*
   2  * drivers/staging/omapdrm/omap_crtc.c
   3  *
   4  * Copyright (C) 2011 Texas Instruments
   5  * Author: Rob Clark <rob@ti.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms of the GNU General Public License version 2 as published by
   9  * the Free Software Foundation.
  10  *
  11  * This program is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  14  * more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along with
  17  * this program.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include "omap_drv.h"
  21
  22 #include "drm_mode.h"
  23 #include "drm_crtc.h"
  24 #include "drm_crtc_helper.h"
  25
  26 #define to_omap_crtc(x) container_of(x, struct omap_crtc, base)
  27
  28 struct omap_crtc {
  29         struct drm_crtc base;
  30         struct omap_overlay *ovl;
  31         struct omap_overlay_info info;
  32         int id;
  33
  34         /* if there is a pending flip, this will be non-null: */
  35         struct drm_pending_vblank_event *event;
  36 };
  37
  38 /* push changes down to dss2 */
  39 static int commit(struct drm_crtc *crtc)
  40 {
  41         struct drm_device *dev = crtc->dev;
  42         struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
  43         struct omap_overlay *ovl = omap_crtc->ovl;
  44         struct omap_overlay_info *info = &omap_crtc->info;
  45         int ret;
  46
  47         DBG("%s", omap_crtc->ovl->name);
  48         DBG("%dx%d -> %dx%d (%d)", info->width, info->height, info->out_width,
  49                         info->out_height, info->screen_width);
  50         DBG("%d,%d %08x", info->pos_x, info->pos_y, info->paddr);
  51
  52         /* NOTE: do we want to do this at all here, or just wait
  53          * for dpms(ON) since other CRTC's may not have their mode
  54          * set yet, so fb dimensions may still change..
  55          */
  56         ret = ovl->set_overlay_info(ovl, info);
  57         if (ret) {
  58                 dev_err(dev->dev, "could not set overlay info\n");
  59                 return ret;
  60         }
  61
  62         /* our encoder doesn't necessarily get a commit() after this, in
  63          * particular in the dpms() and mode_set_base() cases, so force the
  64          * manager to update:
  65          *
  66          * could this be in the encoder somehow?
  67          */
  68         if (ovl->manager) {
  69                 ret = ovl->manager->apply(ovl->manager);
  70                 if (ret) {
  71                         dev_err(dev->dev, "could not apply settings\n");
  72                         return ret;
  73                 }
  74         }
  75
  76         if (info->enabled) {
  77                 omap_framebuffer_flush(crtc->fb, crtc->x, crtc->y,
  78                                 crtc->fb->width, crtc->fb->height);
  79         }
  80
  81         return 0;
  82 }
  83
  84 /* update parameters that are dependent on the framebuffer dimensions and
  85  * position within the fb that this crtc scans out from. This is called
  86  * when framebuffer dimensions or x,y base may have changed, either due
  87  * to our mode, or a change in another crtc that is scanning out of the
  88  * same fb.
  89  */
  90 static void update_scanout(struct drm_crtc *crtc)
  91 {
  92         struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
  93         dma_addr_t paddr;
  94         unsigned int screen_width;
  95
  96         omap_framebuffer_get_buffer(crtc->fb, crtc->x, crtc->y,
  97                         NULL, &paddr, &screen_width);
  98
  99         DBG("%s: %d,%d: %08x (%d)", omap_crtc->ovl->name,
 100                         crtc->x, crtc->y, (u32)paddr, screen_width);
 101
 102         omap_crtc->info.paddr = paddr;
 103         omap_crtc->info.screen_width = screen_width;
 104 }
 105
 106 static void omap_crtc_gamma_set(struct drm_crtc *crtc,
 107                 u16 *red, u16 *green, u16 *blue, uint32_t start, uint32_t size)
 108 {
 109         struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
 110         DBG("%s", omap_crtc->ovl->name);
 111 }
 112
 113 static void omap_crtc_destroy(struct drm_crtc *crtc)
 114 {
 115         struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
 116         DBG("%s", omap_crtc->ovl->name);
 117         drm_crtc_cleanup(crtc);
 118         kfree(omap_crtc);
 119 }
 120
 121 static void omap_crtc_dpms(struct drm_crtc *crtc, int mode)
 122 {
 123         struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
 124
 125         DBG("%s: %d", omap_crtc->ovl->name, mode);
 126
 127         if (mode == DRM_MODE_DPMS_ON) {
 128                 update_scanout(crtc);
 129                 omap_crtc->info.enabled = true;
 130         } else {
 131                 omap_crtc->info.enabled = false;
 132         }
 133
 134         WARN_ON(commit(crtc));
 135 }
 136
 137 static bool omap_crtc_mode_fixup(struct drm_crtc *crtc,
 138                                   struct drm_display_mode *mode,
 139                                   struct drm_display_mode *adjusted_mode)
 140 {
 141         struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
 142         DBG("%s", omap_crtc->ovl->name);
 143         return true;
 144 }
 145
 146 static int omap_crtc_mode_set(struct drm_crtc *crtc,
 147                                struct drm_display_mode *mode,
 148                                struct drm_display_mode *adjusted_mode,
 149                                int x, int y,
 150                                struct drm_framebuffer *old_fb)
 151 {
 152         struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
 153
 154         DBG("%s: %d,%d: %dx%d", omap_crtc->ovl->name, x, y,
 155                         mode->hdisplay, mode->vdisplay);
 156
 157         /* just use adjusted mode */
 158         mode = adjusted_mode;
 159
 160         omap_crtc->info.width = mode->hdisplay;
 161         omap_crtc->info.height = mode->vdisplay;
 162         omap_crtc->info.out_width = mode->hdisplay;
 163         omap_crtc->info.out_height = mode->vdisplay;
 164         omap_crtc->info.color_mode = OMAP_DSS_COLOR_RGB24U;
 165         omap_crtc->info.rotation_type = OMAP_DSS_ROT_DMA;
 166         omap_crtc->info.rotation = OMAP_DSS_ROT_0;
 167         omap_crtc->info.global_alpha = 0xff;
 168         omap_crtc->info.mirror = 0;
 169         omap_crtc->info.mirror = 0;
 170         omap_crtc->info.pos_x = 0;
 171         omap_crtc->info.pos_y = 0;
 172 #if 0 /* re-enable when these are available in DSS2 driver */
 173         omap_crtc->info.zorder = 3;        /* GUI in the front, video behind */
 174         omap_crtc->info.min_x_decim = 1;
 175         omap_crtc->info.max_x_decim = 1;
 176         omap_crtc->info.min_y_decim = 1;
 177         omap_crtc->info.max_y_decim = 1;
 178 #endif
 179
 180         update_scanout(crtc);
 181
 182         return 0;
 183 }
 184
 185 static void omap_crtc_prepare(struct drm_crtc *crtc)
 186 {
 187         struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
 188         struct omap_overlay *ovl = omap_crtc->ovl;
 189
 190         DBG("%s", omap_crtc->ovl->name);
 191
 192         ovl->get_overlay_info(ovl, &omap_crtc->info);
 193
 194         omap_crtc_dpms(crtc, DRM_MODE_DPMS_OFF);
 195 }
 196
 197 static void omap_crtc_commit(struct drm_crtc *crtc)
 198 {
 199         struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
 200         DBG("%s", omap_crtc->ovl->name);
 201         omap_crtc_dpms(crtc, DRM_MODE_DPMS_ON);
 202 }
 203
 204 static int omap_crtc_mode_set_base(struct drm_crtc *crtc, int x, int y,
 205                     struct drm_framebuffer *old_fb)
 206 {
 207         struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
 208
 209         DBG("%s %d,%d: fb=%p", omap_crtc->ovl->name, x, y, old_fb);
 210
 211         update_scanout(crtc);
 212
 213         return commit(crtc);
 214 }
 215
 216 static void omap_crtc_load_lut(struct drm_crtc *crtc)
 217 {
 218         struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
 219         DBG("%s", omap_crtc->ovl->name);
 220 }
 221
 222 static void page_flip_cb(void *arg)
 223 {
 224         struct drm_crtc *crtc = arg;
 225         struct drm_device *dev = crtc->dev;
 226         struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
 227         struct drm_pending_vblank_event *event = omap_crtc->event;
 228         struct timeval now;
 229         unsigned long flags;
 230
 231         WARN_ON(!event);
 232
 233         omap_crtc->event = NULL;
 234
 235         update_scanout(crtc);
 236         WARN_ON(commit(crtc));
 237
 238         /* wakeup userspace */
 239         /* TODO: this should happen *after* flip in vsync IRQ handler */
 240         if (event) {
 241                 spin_lock_irqsave(&dev->event_lock, flags);
 242                 event->event.sequence = drm_vblank_count_and_time(
 243                                 dev, omap_crtc->id, &now);
 244                 event->event.tv_sec = now.tv_sec;
 245                 event->event.tv_usec = now.tv_usec;
 246                 list_add_tail(&event->base.link,
 247                                 &event->base.file_priv->event_list);
 248                 wake_up_interruptible(&event->base.file_priv->event_wait);
 249                 spin_unlock_irqrestore(&dev->event_lock, flags);
 250         }
 251 }
 252
 253 static int omap_crtc_page_flip_locked(struct drm_crtc *crtc,
 254                  struct drm_framebuffer *fb,
 255                  struct drm_pending_vblank_event *event)
 256 {
 257         struct drm_device *dev = crtc->dev;
 258         struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
 259
 260         DBG("%d -> %d", crtc->fb ? crtc->fb->base.id : -1, fb->base.id);
 261
 262         if (omap_crtc->event) {
 263                 dev_err(dev->dev, "already a pending flip\n");
 264                 return -EINVAL;
 265         }
 266
 267         crtc->fb = fb;
 268         omap_crtc->event = event;
 269
 270         omap_gem_op_async(omap_framebuffer_bo(fb), OMAP_GEM_READ,
 271                         page_flip_cb, crtc);
 272
 273         return 0;
 274 }
 275
 276 static const struct drm_crtc_funcs omap_crtc_funcs = {
 277         .gamma_set = omap_crtc_gamma_set,
 278         .set_config = drm_crtc_helper_set_config,
 279         .destroy = omap_crtc_destroy,
 280         .page_flip = omap_crtc_page_flip_locked,
 281 };
 282
 283 static const struct drm_crtc_helper_funcs omap_crtc_helper_funcs = {
 284         .dpms = omap_crtc_dpms,
 285         .mode_fixup = omap_crtc_mode_fixup,
 286         .mode_set = omap_crtc_mode_set,
 287         .prepare = omap_crtc_prepare,
 288         .commit = omap_crtc_commit,
 289         .mode_set_base = omap_crtc_mode_set_base,
 290         .load_lut = omap_crtc_load_lut,
 291 };
 292
 293 struct omap_overlay *omap_crtc_get_overlay(struct drm_crtc *crtc)
 294 {
 295         struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
 296         return omap_crtc->ovl;
 297 }
 298
 299 /* initialize crtc */
 300 struct drm_crtc *omap_crtc_init(struct drm_device *dev,
 301                 struct omap_overlay *ovl, int id)
 302 {
 303         struct drm_crtc *crtc = NULL;
 304         struct omap_crtc *omap_crtc = kzalloc(sizeof(*omap_crtc), GFP_KERNEL);
 305
 306         DBG("%s", ovl->name);
 307
 308         if (!omap_crtc) {
 309                 dev_err(dev->dev, "could not allocate CRTC\n");
 310                 goto fail;
 311         }
 312
 313         omap_crtc->ovl = ovl;
 314         omap_crtc->id = id;
 315         crtc = &omap_crtc->base;
 316         drm_crtc_init(dev, crtc, &omap_crtc_funcs);
 317         drm_crtc_helper_add(crtc, &omap_crtc_helper_funcs);
 318
 319         return crtc;
 320
 321 fail:
 322         if (crtc) {
 323                 drm_crtc_cleanup(crtc);
 324                 kfree(omap_crtc);
 325         }
 326         return NULL;
 327 }