drivers/gpu/drm/omapdrm/omap_fb.c

   1 /*
   2  * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/
   3  * Author: Rob Clark <rob@ti.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 as published by
   7  * the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #include <linux/seq_file.h>
  19
  20 #include <drm/drm_crtc.h>
  21 #include <drm/drm_modeset_helper.h>
  22 #include <drm/drm_gem_framebuffer_helper.h>
  23
  24 #include "omap_dmm_tiler.h"
  25 #include "omap_drv.h"
  26
  27 /*
  28  * framebuffer funcs
  29  */
  30
  31 static const u32 formats[] = {
  32         /* 16bpp [A]RGB: */
  33         DRM_FORMAT_RGB565, /* RGB16-565 */
  34         DRM_FORMAT_RGBX4444, /* RGB12x-4444 */
  35         DRM_FORMAT_XRGB4444, /* xRGB12-4444 */
  36         DRM_FORMAT_RGBA4444, /* RGBA12-4444 */
  37         DRM_FORMAT_ARGB4444, /* ARGB16-4444 */
  38         DRM_FORMAT_XRGB1555, /* xRGB15-1555 */
  39         DRM_FORMAT_ARGB1555, /* ARGB16-1555 */
  40         /* 24bpp RGB: */
  41         DRM_FORMAT_RGB888,   /* RGB24-888 */
  42         /* 32bpp [A]RGB: */
  43         DRM_FORMAT_RGBX8888, /* RGBx24-8888 */
  44         DRM_FORMAT_XRGB8888, /* xRGB24-8888 */
  45         DRM_FORMAT_RGBA8888, /* RGBA32-8888 */
  46         DRM_FORMAT_ARGB8888, /* ARGB32-8888 */
  47         /* YUV: */
  48         DRM_FORMAT_NV12,
  49         DRM_FORMAT_YUYV,
  50         DRM_FORMAT_UYVY,
  51 };
  52
  53 /* per-plane info for the fb: */
  54 struct plane {
  55         dma_addr_t dma_addr;
  56 };
  57
  58 #define to_omap_framebuffer(x) container_of(x, struct omap_framebuffer, base)
  59
  60 struct omap_framebuffer {
  61         struct drm_framebuffer base;
  62         int pin_count;
  63         const struct drm_format_info *format;
  64         struct plane planes[2];
  65         /* lock for pinning (pin_count and planes.dma_addr) */
  66         struct mutex lock;
  67 };
  68
  69 static const struct drm_framebuffer_funcs omap_framebuffer_funcs = {
  70         .create_handle = drm_gem_fb_create_handle,
  71         .destroy = drm_gem_fb_destroy,
  72 };
  73
  74 static u32 get_linear_addr(struct drm_framebuffer *fb,
  75                 const struct drm_format_info *format, int n, int x, int y)
  76 {
  77         struct omap_framebuffer *omap_fb = to_omap_framebuffer(fb);
  78         struct plane *plane = &omap_fb->planes[n];
  79         u32 offset;
  80
  81         offset = fb->offsets[n]
  82                + (x * format->cpp[n] / (n == 0 ? 1 : format->hsub))
  83                + (y * fb->pitches[n] / (n == 0 ? 1 : format->vsub));
  84
  85         return plane->dma_addr + offset;
  86 }
  87
  88 bool omap_framebuffer_supports_rotation(struct drm_framebuffer *fb)
  89 {
  90         return omap_gem_flags(fb->obj[0]) & OMAP_BO_TILED;
  91 }
  92
  93 /* Note: DRM rotates counter-clockwise, TILER & DSS rotates clockwise */
  94 static u32 drm_rotation_to_tiler(unsigned int drm_rot)
  95 {
  96         u32 orient;
  97
  98         switch (drm_rot & DRM_MODE_ROTATE_MASK) {
  99         default:
 100         case DRM_MODE_ROTATE_0:
 101                 orient = 0;
 102                 break;
 103         case DRM_MODE_ROTATE_90:
 104                 orient = MASK_XY_FLIP | MASK_X_INVERT;
 105                 break;
 106         case DRM_MODE_ROTATE_180:
 107                 orient = MASK_X_INVERT | MASK_Y_INVERT;
 108                 break;
 109         case DRM_MODE_ROTATE_270:
 110                 orient = MASK_XY_FLIP | MASK_Y_INVERT;
 111                 break;
 112         }
 113
 114         if (drm_rot & DRM_MODE_REFLECT_X)
 115                 orient ^= MASK_X_INVERT;
 116
 117         if (drm_rot & DRM_MODE_REFLECT_Y)
 118                 orient ^= MASK_Y_INVERT;
 119
 120         return orient;
 121 }
 122
 123 /* update ovl info for scanout, handles cases of multi-planar fb's, etc.
 124  */
 125 void omap_framebuffer_update_scanout(struct drm_framebuffer *fb,
 126                 struct drm_plane_state *state, struct omap_overlay_info *info)
 127 {
 128         struct omap_framebuffer *omap_fb = to_omap_framebuffer(fb);
 129         const struct drm_format_info *format = omap_fb->format;
 130         struct plane *plane = &omap_fb->planes[0];
 131         u32 x, y, orient = 0;
 132
 133         info->fourcc = fb->format->format;
 134
 135         info->pos_x      = state->crtc_x;
 136         info->pos_y      = state->crtc_y;
 137         info->out_width  = state->crtc_w;
 138         info->out_height = state->crtc_h;
 139         info->width      = state->src_w >> 16;
 140         info->height     = state->src_h >> 16;
 141
 142         /* DSS driver wants the w & h in rotated orientation */
 143         if (drm_rotation_90_or_270(state->rotation))
 144                 swap(info->width, info->height);
 145
 146         x = state->src_x >> 16;
 147         y = state->src_y >> 16;
 148
 149         if (omap_gem_flags(fb->obj[0]) & OMAP_BO_TILED) {
 150                 u32 w = state->src_w >> 16;
 151                 u32 h = state->src_h >> 16;
 152
 153                 orient = drm_rotation_to_tiler(state->rotation);
 154
 155                 /*
 156                  * omap_gem_rotated_paddr() wants the x & y in tiler units.
 157                  * Usually tiler unit size is the same as the pixel size, except
 158                  * for YUV422 formats, for which the tiler unit size is 32 bits
 159                  * and pixel size is 16 bits.
 160                  */
 161                 if (fb->format->format == DRM_FORMAT_UYVY ||
 162                                 fb->format->format == DRM_FORMAT_YUYV) {
 163                         x /= 2;
 164                         w /= 2;
 165                 }
 166
 167                 /* adjust x,y offset for invert: */
 168                 if (orient & MASK_Y_INVERT)
 169                         y += h - 1;
 170                 if (orient & MASK_X_INVERT)
 171                         x += w - 1;
 172
 173                 /* Note: x and y are in TILER units, not pixels */
 174                 omap_gem_rotated_dma_addr(fb->obj[0], orient, x, y,
 175                                           &info->paddr);
 176                 info->rotation_type = OMAP_DSS_ROT_TILER;
 177                 info->rotation = state->rotation ?: DRM_MODE_ROTATE_0;
 178                 /* Note: stride in TILER units, not pixels */
 179                 info->screen_width  = omap_gem_tiled_stride(fb->obj[0], orient);
 180         } else {
 181                 switch (state->rotation & DRM_MODE_ROTATE_MASK) {
 182                 case 0:
 183                 case DRM_MODE_ROTATE_0:
 184                         /* OK */
 185                         break;
 186
 187                 default:
 188                         dev_warn(fb->dev->dev,
 189                                 "rotation '%d' ignored for non-tiled fb\n",
 190                                 state->rotation);
 191                         break;
 192                 }
 193
 194                 info->paddr         = get_linear_addr(fb, format, 0, x, y);
 195                 info->rotation_type = OMAP_DSS_ROT_NONE;
 196                 info->rotation      = DRM_MODE_ROTATE_0;
 197                 info->screen_width  = fb->pitches[0];
 198         }
 199
 200         /* convert to pixels: */
 201         info->screen_width /= format->cpp[0];
 202
 203         if (fb->format->format == DRM_FORMAT_NV12) {
 204                 plane = &omap_fb->planes[1];
 205
 206                 if (info->rotation_type == OMAP_DSS_ROT_TILER) {
 207                         WARN_ON(!(omap_gem_flags(fb->obj[1]) & OMAP_BO_TILED));
 208                         omap_gem_rotated_dma_addr(fb->obj[1], orient, x/2, y/2,
 209                                                   &info->p_uv_addr);
 210                 } else {
 211                         info->p_uv_addr = get_linear_addr(fb, format, 1, x, y);
 212                 }
 213         } else {
 214                 info->p_uv_addr = 0;
 215         }
 216 }
 217
 218 /* pin, prepare for scanout: */
 219 int omap_framebuffer_pin(struct drm_framebuffer *fb)
 220 {
 221         struct omap_framebuffer *omap_fb = to_omap_framebuffer(fb);
 222         int ret, i, n = fb->format->num_planes;
 223
 224         mutex_lock(&omap_fb->lock);
 225
 226         if (omap_fb->pin_count > 0) {
 227                 omap_fb->pin_count++;
 228                 mutex_unlock(&omap_fb->lock);
 229                 return 0;
 230         }
 231
 232         for (i = 0; i < n; i++) {
 233                 struct plane *plane = &omap_fb->planes[i];
 234                 ret = omap_gem_pin(fb->obj[i], &plane->dma_addr);
 235                 if (ret)
 236                         goto fail;
 237                 omap_gem_dma_sync_buffer(fb->obj[i], DMA_TO_DEVICE);
 238         }
 239
 240         omap_fb->pin_count++;
 241
 242         mutex_unlock(&omap_fb->lock);
 243
 244         return 0;
 245
 246 fail:
 247         for (i--; i >= 0; i--) {
 248                 struct plane *plane = &omap_fb->planes[i];
 249                 omap_gem_unpin(fb->obj[i]);
 250                 plane->dma_addr = 0;
 251         }
 252
 253         mutex_unlock(&omap_fb->lock);
 254
 255         return ret;
 256 }
 257
 258 /* unpin, no longer being scanned out: */
 259 void omap_framebuffer_unpin(struct drm_framebuffer *fb)
 260 {
 261         struct omap_framebuffer *omap_fb = to_omap_framebuffer(fb);
 262         int i, n = fb->format->num_planes;
 263
 264         mutex_lock(&omap_fb->lock);
 265
 266         omap_fb->pin_count--;
 267
 268         if (omap_fb->pin_count > 0) {
 269                 mutex_unlock(&omap_fb->lock);
 270                 return;
 271         }
 272
 273         for (i = 0; i < n; i++) {
 274                 struct plane *plane = &omap_fb->planes[i];
 275                 omap_gem_unpin(fb->obj[i]);
 276                 plane->dma_addr = 0;
 277         }
 278
 279         mutex_unlock(&omap_fb->lock);
 280 }
 281
 282 #ifdef CONFIG_DEBUG_FS
 283 void omap_framebuffer_describe(struct drm_framebuffer *fb, struct seq_file *m)
 284 {
 285         int i, n = fb->format->num_planes;
 286
 287         seq_printf(m, "fb: %dx%d@%4.4s\n", fb->width, fb->height,
 288                         (char *)&fb->format->format);
 289
 290         for (i = 0; i < n; i++) {
 291                 seq_printf(m, "   %d: offset=%d pitch=%d, obj: ",
 292                                 i, fb->offsets[n], fb->pitches[i]);
 293                 omap_gem_describe(fb->obj[i], m);
 294         }
 295 }
 296 #endif
 297
 298 struct drm_framebuffer *omap_framebuffer_create(struct drm_device *dev,
 299                 struct drm_file *file, const struct drm_mode_fb_cmd2 *mode_cmd)
 300 {
 301         unsigned int num_planes = drm_format_num_planes(mode_cmd->pixel_format);
 302         struct drm_gem_object *bos[4];
 303         struct drm_framebuffer *fb;
 304         int i;
 305
 306         for (i = 0; i < num_planes; i++) {
 307                 bos[i] = drm_gem_object_lookup(file, mode_cmd->handles[i]);
 308                 if (!bos[i]) {
 309                         fb = ERR_PTR(-ENOENT);
 310                         goto error;
 311                 }
 312         }
 313
 314         fb = omap_framebuffer_init(dev, mode_cmd, bos);
 315         if (IS_ERR(fb))
 316                 goto error;
 317
 318         return fb;
 319
 320 error:
 321         while (--i >= 0)
 322                 drm_gem_object_put_unlocked(bos[i]);
 323
 324         return fb;
 325 }
 326
 327 struct drm_framebuffer *omap_framebuffer_init(struct drm_device *dev,
 328                 const struct drm_mode_fb_cmd2 *mode_cmd, struct drm_gem_object **bos)
 329 {
 330         const struct drm_format_info *format = NULL;
 331         struct omap_framebuffer *omap_fb = NULL;
 332         struct drm_framebuffer *fb = NULL;
 333         unsigned int pitch = mode_cmd->pitches[0];
 334         int ret, i;
 335
 336         DBG("create framebuffer: dev=%p, mode_cmd=%p (%dx%d@%4.4s)",
 337                         dev, mode_cmd, mode_cmd->width, mode_cmd->height,
 338                         (char *)&mode_cmd->pixel_format);
 339
 340         format = drm_format_info(mode_cmd->pixel_format);
 341
 342         for (i = 0; i < ARRAY_SIZE(formats); i++) {
 343                 if (formats[i] == mode_cmd->pixel_format)
 344                         break;
 345         }
 346
 347         if (!format || i == ARRAY_SIZE(formats)) {
 348                 dev_dbg(dev->dev, "unsupported pixel format: %4.4s\n",
 349                         (char *)&mode_cmd->pixel_format);
 350                 ret = -EINVAL;
 351                 goto fail;
 352         }
 353
 354         omap_fb = kzalloc(sizeof(*omap_fb), GFP_KERNEL);
 355         if (!omap_fb) {
 356                 ret = -ENOMEM;
 357                 goto fail;
 358         }
 359
 360         fb = &omap_fb->base;
 361         omap_fb->format = format;
 362         mutex_init(&omap_fb->lock);
 363
 364         /*
 365          * The code below assumes that no format use more than two planes, and
 366          * that the two planes of multiplane formats need the same number of
 367          * bytes per pixel.
 368          */
 369         if (format->num_planes == 2 && pitch != mode_cmd->pitches[1]) {
 370                 dev_dbg(dev->dev, "pitches differ between planes 0 and 1\n");
 371                 ret = -EINVAL;
 372                 goto fail;
 373         }
 374
 375         if (pitch % format->cpp[0]) {
 376                 dev_dbg(dev->dev,
 377                         "buffer pitch (%u bytes) is not a multiple of pixel size (%u bytes)\n",
 378                         pitch, format->cpp[0]);
 379                 ret = -EINVAL;
 380                 goto fail;
 381         }
 382
 383         for (i = 0; i < format->num_planes; i++) {
 384                 struct plane *plane = &omap_fb->planes[i];
 385                 unsigned int vsub = i == 0 ? 1 : format->vsub;
 386                 unsigned int size;
 387
 388                 size = pitch * mode_cmd->height / vsub;
 389
 390                 if (size > omap_gem_mmap_size(bos[i]) - mode_cmd->offsets[i]) {
 391                         dev_dbg(dev->dev,
 392                                 "provided buffer object is too small! %zu < %d\n",
 393                                 bos[i]->size - mode_cmd->offsets[i], size);
 394                         ret = -EINVAL;
 395                         goto fail;
 396                 }
 397
 398                 fb->obj[i]    = bos[i];
 399                 plane->dma_addr  = 0;
 400         }
 401
 402         drm_helper_mode_fill_fb_struct(dev, fb, mode_cmd);
 403
 404         ret = drm_framebuffer_init(dev, fb, &omap_framebuffer_funcs);
 405         if (ret) {
 406                 dev_err(dev->dev, "framebuffer init failed: %d\n", ret);
 407                 goto fail;
 408         }
 409
 410         DBG("create: FB ID: %d (%p)", fb->base.id, fb);
 411
 412         return fb;
 413
 414 fail:
 415         kfree(omap_fb);
 416
 417         return ERR_PTR(ret);
 418 }