drivers/staging/omapdrm/omap_fb.c

   1 /*
   2  * drivers/staging/omapdrm/omap_fb.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_crtc.h"
  23 #include "drm_crtc_helper.h"
  24
  25 /*
  26  * framebuffer funcs
  27  */
  28
  29 /* per-format info: */
  30 struct format {
  31         enum omap_color_mode dss_format;
  32         uint32_t pixel_format;
  33         struct {
  34                 int stride_bpp;           /* this times width is stride */
  35                 int sub_y;                /* sub-sample in y dimension */
  36         } planes[4];
  37         bool yuv;
  38 };
  39
  40 static const struct format formats[] = {
  41         /* 16bpp [A]RGB: */
  42         { OMAP_DSS_COLOR_RGB16,       DRM_FORMAT_RGB565,   {{2, 1}}, false }, /* RGB16-565 */
  43         { OMAP_DSS_COLOR_RGB12U,      DRM_FORMAT_RGBX4444, {{2, 1}}, false }, /* RGB12x-4444 */
  44         { OMAP_DSS_COLOR_RGBX16,      DRM_FORMAT_XRGB4444, {{2, 1}}, false }, /* xRGB12-4444 */
  45         { OMAP_DSS_COLOR_RGBA16,      DRM_FORMAT_RGBA4444, {{2, 1}}, false }, /* RGBA12-4444 */
  46         { OMAP_DSS_COLOR_ARGB16,      DRM_FORMAT_ARGB4444, {{2, 1}}, false }, /* ARGB16-4444 */
  47         { OMAP_DSS_COLOR_XRGB16_1555, DRM_FORMAT_XRGB1555, {{2, 1}}, false }, /* xRGB15-1555 */
  48         { OMAP_DSS_COLOR_ARGB16_1555, DRM_FORMAT_ARGB1555, {{2, 1}}, false }, /* ARGB16-1555 */
  49         /* 24bpp RGB: */
  50         { OMAP_DSS_COLOR_RGB24P,      DRM_FORMAT_RGB888,   {{3, 1}}, false }, /* RGB24-888 */
  51         /* 32bpp [A]RGB: */
  52         { OMAP_DSS_COLOR_RGBX32,      DRM_FORMAT_RGBX8888, {{4, 1}}, false }, /* RGBx24-8888 */
  53         { OMAP_DSS_COLOR_RGB24U,      DRM_FORMAT_XRGB8888, {{4, 1}}, false }, /* xRGB24-8888 */
  54         { OMAP_DSS_COLOR_RGBA32,      DRM_FORMAT_RGBA8888, {{4, 1}}, false }, /* RGBA32-8888 */
  55         { OMAP_DSS_COLOR_ARGB32,      DRM_FORMAT_ARGB8888, {{4, 1}}, false }, /* ARGB32-8888 */
  56         /* YUV: */
  57         { OMAP_DSS_COLOR_NV12,        DRM_FORMAT_NV12,     {{1, 1}, {1, 2}}, true },
  58         { OMAP_DSS_COLOR_YUV2,        DRM_FORMAT_YUYV,     {{2, 1}}, true },
  59         { OMAP_DSS_COLOR_UYVY,        DRM_FORMAT_UYVY,     {{2, 1}}, true },
  60 };
  61
  62 /* convert from overlay's pixel formats bitmask to an array of fourcc's */
  63 uint32_t omap_framebuffer_get_formats(uint32_t *pixel_formats,
  64                 uint32_t max_formats, enum omap_color_mode supported_modes)
  65 {
  66         uint32_t nformats = 0;
  67         int i = 0;
  68
  69         for (i = 0; i < ARRAY_SIZE(formats) && nformats < max_formats; i++)
  70                 if (formats[i].dss_format & supported_modes)
  71                         pixel_formats[nformats++] = formats[i].pixel_format;
  72
  73         return nformats;
  74 }
  75
  76 /* per-plane info for the fb: */
  77 struct plane {
  78         struct drm_gem_object *bo;
  79         uint32_t pitch;
  80         uint32_t offset;
  81         dma_addr_t paddr;
  82 };
  83
  84 #define to_omap_framebuffer(x) container_of(x, struct omap_framebuffer, base)
  85
  86 struct omap_framebuffer {
  87         struct drm_framebuffer base;
  88         const struct format *format;
  89         struct plane planes[4];
  90 };
  91
  92 static int omap_framebuffer_create_handle(struct drm_framebuffer *fb,
  93                 struct drm_file *file_priv,
  94                 unsigned int *handle)
  95 {
  96         struct omap_framebuffer *omap_fb = to_omap_framebuffer(fb);
  97         return drm_gem_handle_create(file_priv,
  98                         omap_fb->planes[0].bo, handle);
  99 }
 100
 101 static void omap_framebuffer_destroy(struct drm_framebuffer *fb)
 102 {
 103         struct omap_framebuffer *omap_fb = to_omap_framebuffer(fb);
 104         int i, n = drm_format_num_planes(fb->pixel_format);
 105
 106         DBG("destroy: FB ID: %d (%p)", fb->base.id, fb);
 107
 108         drm_framebuffer_cleanup(fb);
 109
 110         for (i = 0; i < n; i++) {
 111                 struct plane *plane = &omap_fb->planes[i];
 112                 if (plane->bo)
 113                         drm_gem_object_unreference_unlocked(plane->bo);
 114         }
 115
 116         kfree(omap_fb);
 117 }
 118
 119 static int omap_framebuffer_dirty(struct drm_framebuffer *fb,
 120                 struct drm_file *file_priv, unsigned flags, unsigned color,
 121                 struct drm_clip_rect *clips, unsigned num_clips)
 122 {
 123         int i;
 124
 125         for (i = 0; i < num_clips; i++) {
 126                 omap_framebuffer_flush(fb, clips[i].x1, clips[i].y1,
 127                                         clips[i].x2 - clips[i].x1,
 128                                         clips[i].y2 - clips[i].y1);
 129         }
 130
 131         return 0;
 132 }
 133
 134 static const struct drm_framebuffer_funcs omap_framebuffer_funcs = {
 135         .create_handle = omap_framebuffer_create_handle,
 136         .destroy = omap_framebuffer_destroy,
 137         .dirty = omap_framebuffer_dirty,
 138 };
 139
 140 /* update ovl info for scanout, handles cases of multi-planar fb's, etc.
 141  */
 142 void omap_framebuffer_update_scanout(struct drm_framebuffer *fb, int x, int y,
 143                 struct omap_overlay_info *info)
 144 {
 145         struct omap_framebuffer *omap_fb = to_omap_framebuffer(fb);
 146         const struct format *format = omap_fb->format;
 147         struct plane *plane = &omap_fb->planes[0];
 148         unsigned int offset;
 149
 150         offset = plane->offset +
 151                         (x * format->planes[0].stride_bpp) +
 152                         (y * plane->pitch / format->planes[0].sub_y);
 153
 154         info->color_mode   = format->dss_format;
 155         info->paddr        = plane->paddr + offset;
 156         info->screen_width = plane->pitch / format->planes[0].stride_bpp;
 157
 158         if (format->dss_format == OMAP_DSS_COLOR_NV12) {
 159                 plane = &omap_fb->planes[1];
 160                 offset = plane->offset +
 161                                 (x * format->planes[1].stride_bpp) +
 162                                 (y * plane->pitch / format->planes[1].sub_y);
 163                 info->p_uv_addr = plane->paddr + offset;
 164         } else {
 165                 info->p_uv_addr = 0;
 166         }
 167 }
 168
 169 /* Call for unpin 'a' (if not NULL), and pin 'b' (if not NULL).  Although
 170  * buffers to unpin are just just pushed to the unpin fifo so that the
 171  * caller can defer unpin until vblank.
 172  *
 173  * Note if this fails (ie. something went very wrong!), all buffers are
 174  * unpinned, and the caller disables the overlay.  We could have tried
 175  * to revert back to the previous set of pinned buffers but if things are
 176  * hosed there is no guarantee that would succeed.
 177  */
 178 int omap_framebuffer_replace(struct drm_framebuffer *a,
 179                 struct drm_framebuffer *b, void *arg,
 180                 void (*unpin)(void *arg, struct drm_gem_object *bo))
 181 {
 182         int ret = 0, i, na, nb;
 183         struct omap_framebuffer *ofba = to_omap_framebuffer(a);
 184         struct omap_framebuffer *ofbb = to_omap_framebuffer(b);
 185
 186         na = a ? drm_format_num_planes(a->pixel_format) : 0;
 187         nb = b ? drm_format_num_planes(b->pixel_format) : 0;
 188
 189         for (i = 0; i < max(na, nb); i++) {
 190                 struct plane *pa, *pb;
 191
 192                 pa = (i < na) ? &ofba->planes[i] : NULL;
 193                 pb = (i < nb) ? &ofbb->planes[i] : NULL;
 194
 195                 if (pa) {
 196                         unpin(arg, pa->bo);
 197                         pa->paddr = 0;
 198                 }
 199
 200                 if (pb && !ret)
 201                         ret = omap_gem_get_paddr(pb->bo, &pb->paddr, true);
 202         }
 203
 204         if (ret) {
 205                 /* something went wrong.. unpin what has been pinned */
 206                 for (i = 0; i < nb; i++) {
 207                         struct plane *pb = &ofba->planes[i];
 208                         if (pb->paddr) {
 209                                 unpin(arg, pb->bo);
 210                                 pb->paddr = 0;
 211                         }
 212                 }
 213         }
 214
 215         return ret;
 216 }
 217
 218 struct drm_gem_object *omap_framebuffer_bo(struct drm_framebuffer *fb, int p)
 219 {
 220         struct omap_framebuffer *omap_fb = to_omap_framebuffer(fb);
 221         if (p >= drm_format_num_planes(fb->pixel_format))
 222                 return NULL;
 223         return omap_fb->planes[p].bo;
 224 }
 225
 226 /* iterate thru all the connectors, returning ones that are attached
 227  * to the same fb..
 228  */
 229 struct drm_connector *omap_framebuffer_get_next_connector(
 230                 struct drm_framebuffer *fb, struct drm_connector *from)
 231 {
 232         struct drm_device *dev = fb->dev;
 233         struct list_head *connector_list = &dev->mode_config.connector_list;
 234         struct drm_connector *connector = from;
 235
 236         if (!from) {
 237                 return list_first_entry(connector_list, typeof(*from), head);
 238         }
 239
 240         list_for_each_entry_from(connector, connector_list, head) {
 241                 if (connector != from) {
 242                         struct drm_encoder *encoder = connector->encoder;
 243                         struct drm_crtc *crtc = encoder ? encoder->crtc : NULL;
 244                         if (crtc && crtc->fb == fb) {
 245                                 return connector;
 246                         }
 247                 }
 248         }
 249
 250         return NULL;
 251 }
 252
 253 /* flush an area of the framebuffer (in case of manual update display that
 254  * is not automatically flushed)
 255  */
 256 void omap_framebuffer_flush(struct drm_framebuffer *fb,
 257                 int x, int y, int w, int h)
 258 {
 259         struct drm_connector *connector = NULL;
 260
 261         VERB("flush: %d,%d %dx%d, fb=%p", x, y, w, h, fb);
 262
 263         while ((connector = omap_framebuffer_get_next_connector(fb, connector))) {
 264                 /* only consider connectors that are part of a chain */
 265                 if (connector->encoder && connector->encoder->crtc) {
 266                         /* TODO: maybe this should propagate thru the crtc who
 267                          * could do the coordinate translation..
 268                          */
 269                         struct drm_crtc *crtc = connector->encoder->crtc;
 270                         int cx = max(0, x - crtc->x);
 271                         int cy = max(0, y - crtc->y);
 272                         int cw = w + (x - crtc->x) - cx;
 273                         int ch = h + (y - crtc->y) - cy;
 274
 275                         omap_connector_flush(connector, cx, cy, cw, ch);
 276                 }
 277         }
 278 }
 279
 280 #ifdef CONFIG_DEBUG_FS
 281 void omap_framebuffer_describe(struct drm_framebuffer *fb, struct seq_file *m)
 282 {
 283         struct omap_framebuffer *omap_fb = to_omap_framebuffer(fb);
 284         int i, n = drm_format_num_planes(fb->pixel_format);
 285
 286         seq_printf(m, "fb: %dx%d@%4.4s\n", fb->width, fb->height,
 287                         (char *)&fb->pixel_format);
 288
 289         for (i = 0; i < n; i++) {
 290                 struct plane *plane = &omap_fb->planes[i];
 291                 seq_printf(m, "   %d: offset=%d pitch=%d, obj: ",
 292                                 i, plane->offset, plane->pitch);
 293                 omap_gem_describe(plane->bo, m);
 294         }
 295 }
 296 #endif
 297
 298 struct drm_framebuffer *omap_framebuffer_create(struct drm_device *dev,
 299                 struct drm_file *file, struct drm_mode_fb_cmd2 *mode_cmd)
 300 {
 301         struct drm_gem_object *bos[4];
 302         struct drm_framebuffer *fb;
 303         int ret;
 304
 305         ret = objects_lookup(dev, file, mode_cmd->pixel_format,
 306                         bos, mode_cmd->handles);
 307         if (ret)
 308                 return ERR_PTR(ret);
 309
 310         fb = omap_framebuffer_init(dev, mode_cmd, bos);
 311         if (IS_ERR(fb)) {
 312                 int i, n = drm_format_num_planes(mode_cmd->pixel_format);
 313                 for (i = 0; i < n; i++)
 314                         drm_gem_object_unreference_unlocked(bos[i]);
 315                 return fb;
 316         }
 317         return fb;
 318 }
 319
 320 struct drm_framebuffer *omap_framebuffer_init(struct drm_device *dev,
 321                 struct drm_mode_fb_cmd2 *mode_cmd, struct drm_gem_object **bos)
 322 {
 323         struct omap_framebuffer *omap_fb;
 324         struct drm_framebuffer *fb = NULL;
 325         const struct format *format = NULL;
 326         int ret, i, n = drm_format_num_planes(mode_cmd->pixel_format);
 327
 328         DBG("create framebuffer: dev=%p, mode_cmd=%p (%dx%d@%4.4s)",
 329                         dev, mode_cmd, mode_cmd->width, mode_cmd->height,
 330                         (char *)&mode_cmd->pixel_format);
 331
 332         for (i = 0; i < ARRAY_SIZE(formats); i++) {
 333                 if (formats[i].pixel_format == mode_cmd->pixel_format) {
 334                         format = &formats[i];
 335                         break;
 336                 }
 337         }
 338
 339         if (!format) {
 340                 dev_err(dev->dev, "unsupported pixel format: %4.4s\n",
 341                                 (char *)&mode_cmd->pixel_format);
 342                 ret = -EINVAL;
 343                 goto fail;
 344         }
 345
 346         omap_fb = kzalloc(sizeof(*omap_fb), GFP_KERNEL);
 347         if (!omap_fb) {
 348                 dev_err(dev->dev, "could not allocate fb\n");
 349                 ret = -ENOMEM;
 350                 goto fail;
 351         }
 352
 353         fb = &omap_fb->base;
 354         ret = drm_framebuffer_init(dev, fb, &omap_framebuffer_funcs);
 355         if (ret) {
 356                 dev_err(dev->dev, "framebuffer init failed: %d\n", ret);
 357                 goto fail;
 358         }
 359
 360         DBG("create: FB ID: %d (%p)", fb->base.id, fb);
 361
 362         omap_fb->format = format;
 363
 364         for (i = 0; i < n; i++) {
 365                 struct plane *plane = &omap_fb->planes[i];
 366                 int size, pitch = mode_cmd->pitches[i];
 367
 368                 if (pitch < (mode_cmd->width * format->planes[i].stride_bpp)) {
 369                         dev_err(dev->dev, "provided buffer pitch is too small! %d < %d\n",
 370                                         pitch, mode_cmd->width * format->planes[i].stride_bpp);
 371                         ret = -EINVAL;
 372                         goto fail;
 373                 }
 374
 375                 size = pitch * mode_cmd->height / format->planes[i].sub_y;
 376
 377                 if (size > (bos[i]->size - mode_cmd->offsets[i])) {
 378                         dev_err(dev->dev, "provided buffer object is too small! %d < %d\n",
 379                                         bos[i]->size - mode_cmd->offsets[i], size);
 380                         ret = -EINVAL;
 381                         goto fail;
 382                 }
 383
 384                 plane->bo     = bos[i];
 385                 plane->offset = mode_cmd->offsets[i];
 386                 plane->pitch  = pitch;
 387                 plane->paddr  = 0;
 388         }
 389
 390         drm_helper_mode_fill_fb_struct(fb, mode_cmd);
 391
 392         return fb;
 393
 394 fail:
 395         if (fb) {
 396                 omap_framebuffer_destroy(fb);
 397         }
 398         return ERR_PTR(ret);
 399 }