drivers/staging/omapdrm/omap_plane.c

   1 /*
   2  * drivers/staging/omapdrm/omap_plane.c
   3  *
   4  * Copyright (C) 2011 Texas Instruments
   5  * Author: Rob Clark <rob.clark@linaro.org>
   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 /* some hackery because omapdss has an 'enum omap_plane' (which would be
  23  * better named omap_plane_id).. and compiler seems unhappy about having
  24  * both a 'struct omap_plane' and 'enum omap_plane'
  25  */
  26 #define omap_plane _omap_plane
  27
  28 /*
  29  * plane funcs
  30  */
  31
  32 #define to_omap_plane(x) container_of(x, struct omap_plane, base)
  33
  34 struct omap_plane {
  35         struct drm_plane base;
  36         struct omap_overlay *ovl;
  37         struct omap_overlay_info info;
  38
  39         /* Source values, converted to integers because we don't support
  40          * fractional positions:
  41          */
  42         unsigned int src_x, src_y;
  43
  44         /* last fb that we pinned: */
  45         struct drm_framebuffer *pinned_fb;
  46
  47         uint32_t nformats;
  48         uint32_t formats[32];
  49 };
  50
  51 /* push changes down to dss2 */
  52 static int commit(struct drm_plane *plane)
  53 {
  54         struct drm_device *dev = plane->dev;
  55         struct omap_plane *omap_plane = to_omap_plane(plane);
  56         struct omap_overlay *ovl = omap_plane->ovl;
  57         struct omap_overlay_info *info = &omap_plane->info;
  58         int ret;
  59
  60         DBG("%s", ovl->name);
  61         DBG("%dx%d -> %dx%d (%d)", info->width, info->height, info->out_width,
  62                         info->out_height, info->screen_width);
  63         DBG("%d,%d %08x %08x", info->pos_x, info->pos_y,
  64                         info->paddr, info->p_uv_addr);
  65
  66         /* NOTE: do we want to do this at all here, or just wait
  67          * for dpms(ON) since other CRTC's may not have their mode
  68          * set yet, so fb dimensions may still change..
  69          */
  70         ret = ovl->set_overlay_info(ovl, info);
  71         if (ret) {
  72                 dev_err(dev->dev, "could not set overlay info\n");
  73                 return ret;
  74         }
  75
  76         /* our encoder doesn't necessarily get a commit() after this, in
  77          * particular in the dpms() and mode_set_base() cases, so force the
  78          * manager to update:
  79          *
  80          * could this be in the encoder somehow?
  81          */
  82         if (ovl->manager) {
  83                 ret = ovl->manager->apply(ovl->manager);
  84                 if (ret) {
  85                         dev_err(dev->dev, "could not apply settings\n");
  86                         return ret;
  87                 }
  88         }
  89
  90         if (ovl->is_enabled(ovl)) {
  91                 omap_framebuffer_flush(plane->fb, info->pos_x, info->pos_y,
  92                                 info->out_width, info->out_height);
  93         }
  94
  95         return 0;
  96 }
  97
  98 /* when CRTC that we are attached to has potentially changed, this checks
  99  * if we are attached to proper manager, and if necessary updates.
 100  */
 101 static void update_manager(struct drm_plane *plane)
 102 {
 103         struct omap_drm_private *priv = plane->dev->dev_private;
 104         struct omap_plane *omap_plane = to_omap_plane(plane);
 105         struct omap_overlay *ovl = omap_plane->ovl;
 106         struct omap_overlay_manager *mgr = NULL;
 107         int i;
 108
 109         if (plane->crtc) {
 110                 for (i = 0; i < priv->num_encoders; i++) {
 111                         struct drm_encoder *encoder = priv->encoders[i];
 112                         if (encoder->crtc == plane->crtc) {
 113                                 mgr = omap_encoder_get_manager(encoder);
 114                                 break;
 115                         }
 116                 }
 117         }
 118
 119         if (ovl->manager != mgr) {
 120                 bool enabled = ovl->is_enabled(ovl);
 121
 122                 /* don't switch things around with enabled overlays: */
 123                 if (enabled)
 124                         omap_plane_dpms(plane, DRM_MODE_DPMS_OFF);
 125
 126                 if (ovl->manager) {
 127                         DBG("disconnecting %s from %s", ovl->name,
 128                                         ovl->manager->name);
 129                         ovl->unset_manager(ovl);
 130                 }
 131
 132                 if (mgr) {
 133                         DBG("connecting %s to %s", ovl->name, mgr->name);
 134                         ovl->set_manager(ovl, mgr);
 135                 }
 136
 137                 if (enabled && mgr)
 138                         omap_plane_dpms(plane, DRM_MODE_DPMS_ON);
 139         }
 140 }
 141
 142 /* update which fb (if any) is pinned for scanout */
 143 static int update_pin(struct drm_plane *plane, struct drm_framebuffer *fb)
 144 {
 145         struct omap_plane *omap_plane = to_omap_plane(plane);
 146         int ret = 0;
 147
 148         if (omap_plane->pinned_fb != fb) {
 149                 if (omap_plane->pinned_fb)
 150                         omap_framebuffer_unpin(omap_plane->pinned_fb);
 151                 omap_plane->pinned_fb = fb;
 152                 if (fb)
 153                         ret = omap_framebuffer_pin(fb);
 154         }
 155
 156         return ret;
 157 }
 158
 159 /* update parameters that are dependent on the framebuffer dimensions and
 160  * position within the fb that this plane scans out from. This is called
 161  * when framebuffer or x,y base may have changed.
 162  */
 163 static void update_scanout(struct drm_plane *plane)
 164 {
 165         struct omap_plane *omap_plane = to_omap_plane(plane);
 166         struct omap_overlay_info *info = &omap_plane->info;
 167         int ret;
 168
 169         ret = update_pin(plane, plane->fb);
 170         if (ret) {
 171                 dev_err(plane->dev->dev,
 172                         "could not pin fb: %d\n", ret);
 173                 omap_plane_dpms(plane, DRM_MODE_DPMS_OFF);
 174                 return;
 175         }
 176
 177         omap_framebuffer_update_scanout(plane->fb,
 178                         omap_plane->src_x, omap_plane->src_y, info);
 179
 180         DBG("%s: %d,%d: %08x %08x (%d)", omap_plane->ovl->name,
 181                         omap_plane->src_x, omap_plane->src_y,
 182                         (u32)info->paddr, (u32)info->p_uv_addr,
 183                         info->screen_width);
 184 }
 185
 186 int omap_plane_mode_set(struct drm_plane *plane,
 187                 struct drm_crtc *crtc, struct drm_framebuffer *fb,
 188                 int crtc_x, int crtc_y,
 189                 unsigned int crtc_w, unsigned int crtc_h,
 190                 uint32_t src_x, uint32_t src_y,
 191                 uint32_t src_w, uint32_t src_h)
 192 {
 193         struct omap_plane *omap_plane = to_omap_plane(plane);
 194
 195         /* src values are in Q16 fixed point, convert to integer: */
 196         src_x = src_x >> 16;
 197         src_y = src_y >> 16;
 198         src_w = src_w >> 16;
 199         src_h = src_h >> 16;
 200
 201         omap_plane->info.pos_x = crtc_x;
 202         omap_plane->info.pos_y = crtc_y;
 203         omap_plane->info.out_width = crtc_w;
 204         omap_plane->info.out_height = crtc_h;
 205         omap_plane->info.width = src_w;
 206         omap_plane->info.height = src_h;
 207         omap_plane->src_x = src_x;
 208         omap_plane->src_y = src_y;
 209
 210         /* note: this is done after this fxn returns.. but if we need
 211          * to do a commit/update_scanout, etc before this returns we
 212          * need the current value.
 213          */
 214         plane->fb = fb;
 215         plane->crtc = crtc;
 216
 217         update_scanout(plane);
 218         update_manager(plane);
 219
 220         return 0;
 221 }
 222
 223 static int omap_plane_update(struct drm_plane *plane,
 224                 struct drm_crtc *crtc, struct drm_framebuffer *fb,
 225                 int crtc_x, int crtc_y,
 226                 unsigned int crtc_w, unsigned int crtc_h,
 227                 uint32_t src_x, uint32_t src_y,
 228                 uint32_t src_w, uint32_t src_h)
 229 {
 230         omap_plane_mode_set(plane, crtc, fb, crtc_x, crtc_y, crtc_w, crtc_h,
 231                         src_x, src_y, src_w, src_h);
 232         return omap_plane_dpms(plane, DRM_MODE_DPMS_ON);
 233 }
 234
 235 static int omap_plane_disable(struct drm_plane *plane)
 236 {
 237         return omap_plane_dpms(plane, DRM_MODE_DPMS_OFF);
 238 }
 239
 240 static void omap_plane_destroy(struct drm_plane *plane)
 241 {
 242         struct omap_plane *omap_plane = to_omap_plane(plane);
 243         DBG("%s", omap_plane->ovl->name);
 244         omap_plane_disable(plane);
 245         drm_plane_cleanup(plane);
 246         kfree(omap_plane);
 247 }
 248
 249 int omap_plane_dpms(struct drm_plane *plane, int mode)
 250 {
 251         struct omap_plane *omap_plane = to_omap_plane(plane);
 252         struct omap_overlay *ovl = omap_plane->ovl;
 253         int r;
 254
 255         DBG("%s: %d", omap_plane->ovl->name, mode);
 256
 257         if (mode == DRM_MODE_DPMS_ON) {
 258                 update_scanout(plane);
 259                 r = commit(plane);
 260                 if (!r)
 261                         r = ovl->enable(ovl);
 262         } else {
 263                 r = ovl->disable(ovl);
 264                 update_pin(plane, NULL);
 265         }
 266
 267         return r;
 268 }
 269
 270 static const struct drm_plane_funcs omap_plane_funcs = {
 271                 .update_plane = omap_plane_update,
 272                 .disable_plane = omap_plane_disable,
 273                 .destroy = omap_plane_destroy,
 274 };
 275
 276 /* initialize plane */
 277 struct drm_plane *omap_plane_init(struct drm_device *dev,
 278                 struct omap_overlay *ovl, unsigned int possible_crtcs,
 279                 bool priv)
 280 {
 281         struct drm_plane *plane = NULL;
 282         struct omap_plane *omap_plane;
 283
 284         DBG("%s: possible_crtcs=%08x, priv=%d", ovl->name,
 285                         possible_crtcs, priv);
 286
 287         omap_plane = kzalloc(sizeof(*omap_plane), GFP_KERNEL);
 288         if (!omap_plane) {
 289                 dev_err(dev->dev, "could not allocate plane\n");
 290                 goto fail;
 291         }
 292
 293         omap_plane->nformats = omap_framebuffer_get_formats(
 294                         omap_plane->formats, ARRAY_SIZE(omap_plane->formats),
 295                         ovl->supported_modes);
 296         omap_plane->ovl = ovl;
 297         plane = &omap_plane->base;
 298
 299         drm_plane_init(dev, plane, possible_crtcs, &omap_plane_funcs,
 300                         omap_plane->formats, omap_plane->nformats, priv);
 301
 302         /* get our starting configuration, set defaults for parameters
 303          * we don't currently use, etc:
 304          */
 305         ovl->get_overlay_info(ovl, &omap_plane->info);
 306         omap_plane->info.rotation_type = OMAP_DSS_ROT_DMA;
 307         omap_plane->info.rotation = OMAP_DSS_ROT_0;
 308         omap_plane->info.global_alpha = 0xff;
 309         omap_plane->info.mirror = 0;
 310         omap_plane->info.mirror = 0;
 311
 312         /* Set defaults depending on whether we are a CRTC or overlay
 313          * layer.
 314          * TODO add ioctl to give userspace an API to change this.. this
 315          * will come in a subsequent patch.
 316          */
 317         if (priv)
 318                 omap_plane->info.zorder = 0;
 319         else
 320                 omap_plane->info.zorder = 1;
 321
 322         update_manager(plane);
 323
 324         return plane;
 325
 326 fail:
 327         if (plane) {
 328                 omap_plane_destroy(plane);
 329         }
 330         return NULL;
 331 }