drivers/gpu/drm/omapdrm/omap_fb.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2011 Texas Instruments Incorporated - https://www.ti.com/
   4  * Author: Rob Clark <rob@ti.com>
   5  */
   6
   7 #include <linux/dma-mapping.h>
   8
   9 #include <drm/drm_modeset_helper.h>
  10 #include <drm/drm_fourcc.h>
  11 #include <drm/drm_gem_framebuffer_helper.h>
  12
  13 #include "omap_dmm_tiler.h"
  14 #include "omap_drv.h"
  15
  16 /*
  17  * framebuffer funcs
  18  */
  19
  20 static const u32 formats[] = {
  21         /* 16bpp [A]RGB: */
  22         DRM_FORMAT_RGB565, /* RGB16-565 */
  23         DRM_FORMAT_RGBX4444, /* RGB12x-4444 */
  24         DRM_FORMAT_XRGB4444, /* xRGB12-4444 */
  25         DRM_FORMAT_RGBA4444, /* RGBA12-4444 */
  26         DRM_FORMAT_ARGB4444, /* ARGB16-4444 */
  27         DRM_FORMAT_XRGB1555, /* xRGB15-1555 */
  28         DRM_FORMAT_ARGB1555, /* ARGB16-1555 */
  29         /* 24bpp RGB: */
  30         DRM_FORMAT_RGB888,   /* RGB24-888 */
  31         /* 32bpp [A]RGB: */
  32         DRM_FORMAT_RGBX8888, /* RGBx24-8888 */
  33         DRM_FORMAT_XRGB8888, /* xRGB24-8888 */
  34         DRM_FORMAT_RGBA8888, /* RGBA32-8888 */
  35         DRM_FORMAT_ARGB8888, /* ARGB32-8888 */
  36         /* YUV: */
  37         DRM_FORMAT_NV12,
  38         DRM_FORMAT_YUYV,
  39         DRM_FORMAT_UYVY,
  40 };
  41
  42 /* per-plane info for the fb: */
  43 struct plane {
  44         dma_addr_t dma_addr;
  45 };
  46
  47 #define to_omap_framebuffer(x) container_of(x, struct omap_framebuffer, base)
  48
  49 struct omap_framebuffer {
  50         struct drm_framebuffer base;
  51         int pin_count;
  52         const struct drm_format_info *format;
  53         struct plane planes[2];
  54         /* lock for pinning (pin_count and planes.dma_addr) */
  55         struct mutex lock;
  56 };
  57
  58 static int omap_framebuffer_dirty(struct drm_framebuffer *fb,
  59                                   struct drm_file *file_priv,
  60                                   unsigned flags, unsigned color,
  61                                   struct drm_clip_rect *clips,
  62                                   unsigned num_clips)
  63 {
  64         struct drm_crtc *crtc;
  65
  66         drm_modeset_lock_all(fb->dev);
  67
  68         drm_for_each_crtc(crtc, fb->dev)
  69                 omap_crtc_flush(crtc);
  70
  71         drm_modeset_unlock_all(fb->dev);
  72
  73         return 0;
  74 }
  75
  76 static const struct drm_framebuffer_funcs omap_framebuffer_funcs = {
  77         .create_handle = drm_gem_fb_create_handle,
  78         .dirty = omap_framebuffer_dirty,
  79         .destroy = drm_gem_fb_destroy,
  80 };
  81
  82 static u32 get_linear_addr(struct drm_framebuffer *fb,
  83                 const struct drm_format_info *format, int n, int x, int y)
  84 {
  85         struct omap_framebuffer *omap_fb = to_omap_framebuffer(fb);
  86         struct plane *plane = &omap_fb->planes[n];
  87         u32 offset;
  88
  89         offset = fb->offsets[n]
  90                + (x * format->cpp[n] / (n == 0 ? 1 : format->hsub))
  91                + (y * fb->pitches[n] / (n == 0 ? 1 : format->vsub));
  92
  93         return plane->dma_addr + offset;
  94 }
  95
  96 bool omap_framebuffer_supports_rotation(struct drm_framebuffer *fb)
  97 {
  98         return omap_gem_flags(fb->obj[0]) & OMAP_BO_TILED_MASK;
  99 }
 100
 101 /* Note: DRM rotates counter-clockwise, TILER & DSS rotates clockwise */
 102 static u32 drm_rotation_to_tiler(unsigned int drm_rot)
 103 {
 104         u32 orient;
 105
 106         switch (drm_rot & DRM_MODE_ROTATE_MASK) {
 107         default:
 108         case DRM_MODE_ROTATE_0:
 109                 orient = 0;
 110                 break;
 111         case DRM_MODE_ROTATE_90:
 112                 orient = MASK_XY_FLIP | MASK_X_INVERT;
 113                 break;
 114         case DRM_MODE_ROTATE_180:
 115                 orient = MASK_X_INVERT | MASK_Y_INVERT;
 116                 break;
 117         case DRM_MODE_ROTATE_270:
 118                 orient = MASK_XY_FLIP | MASK_Y_INVERT;
 119                 break;
 120         }
 121
 122         if (drm_rot & DRM_MODE_REFLECT_X)
 123                 orient ^= MASK_X_INVERT;
 124
 125         if (drm_rot & DRM_MODE_REFLECT_Y)
 126                 orient ^= MASK_Y_INVERT;
 127
 128         return orient;
 129 }
 130
 131 /* update ovl info for scanout, handles cases of multi-planar fb's, etc.
 132  */
 133 void omap_framebuffer_update_scanout(struct drm_framebuffer *fb,
 134                 struct drm_plane_state *state, struct omap_overlay_info *info)
 135 {
 136         struct omap_framebuffer *omap_fb = to_omap_framebuffer(fb);
 137         const struct drm_format_info *format = omap_fb->format;
 138         u32 x, y, orient = 0;
 139
 140         info->fourcc = fb->format->format;
 141
 142         info->pos_x      = state->crtc_x;
 143         info->pos_y      = state->crtc_y;
 144         info->out_width  = state->crtc_w;
 145         info->out_height = state->crtc_h;
 146         info->width      = state->src_w >> 16;
 147         info->height     = state->src_h >> 16;
 148
 149         /* DSS driver wants the w & h in rotated orientation */
 150         if (drm_rotation_90_or_270(state->rotation))
 151                 swap(info->width, info->height);
 152
 153         x = state->src_x >> 16;
 154         y = state->src_y >> 16;
 155
 156         if (omap_gem_flags(fb->obj[0]) & OMAP_BO_TILED_MASK) {
 157                 u32 w = state->src_w >> 16;
 158                 u32 h = state->src_h >> 16;
 159
 160                 orient = drm_rotation_to_tiler(state->rotation);
 161
 162                 /*
 163                  * omap_gem_rotated_paddr() wants the x & y in tiler units.
 164                  * Usually tiler unit size is the same as the pixel size, except
 165                  * for YUV422 formats, for which the tiler unit size is 32 bits
 166                  * and pixel size is 16 bits.
 167                  */
 168                 if (fb->format->format == DRM_FORMAT_UYVY ||
 169                                 fb->format->format == DRM_FORMAT_YUYV) {
 170                         x /= 2;
 171                         w /= 2;
 172                 }
 173
 174                 /* adjust x,y offset for invert: */
 175                 if (orient & MASK_Y_INVERT)
 176                         y += h - 1;
 177                 if (orient & MASK_X_INVERT)
 178                         x += w - 1;
 179
 180                 /* Note: x and y are in TILER units, not pixels */
 181                 omap_gem_rotated_dma_addr(fb->obj[0], orient, x, y,
 182                                           &info->paddr);
 183                 info->rotation_type = OMAP_DSS_ROT_TILER;
 184                 info->rotation = state->rotation ?: DRM_MODE_ROTATE_0;
 185                 /* Note: stride in TILER units, not pixels */
 186                 info->screen_width  = omap_gem_tiled_stride(fb->obj[0], orient);
 187         } else {
 188                 switch (state->rotation & DRM_MODE_ROTATE_MASK) {
 189                 case 0:
 190                 case DRM_MODE_ROTATE_0:
 191                         /* OK */
 192                         break;
 193
 194                 default:
 195                         dev_warn(fb->dev->dev,
 196                                 "rotation '%d' ignored for non-tiled fb\n",
 197                                 state->rotation);
 198                         break;
 199                 }
 200
 201                 info->paddr         = get_linear_addr(fb, format, 0, x, y);
 202                 info->rotation_type = OMAP_DSS_ROT_NONE;
 203                 info->rotation      = DRM_MODE_ROTATE_0;
 204                 info->screen_width  = fb->pitches[0];
 205         }
 206
 207         /* convert to pixels: */
 208         info->screen_width /= format->cpp[0];
 209
 210         if (fb->format->format == DRM_FORMAT_NV12) {
 211                 if (info->rotation_type == OMAP_DSS_ROT_TILER) {
 212                         WARN_ON(!(omap_gem_flags(fb->obj[1]) & OMAP_BO_TILED_MASK));
 213                         omap_gem_rotated_dma_addr(fb->obj[1], orient, x/2, y/2,
 214                                                   &info->p_uv_addr);
 215                 } else {
 216                         info->p_uv_addr = get_linear_addr(fb, format, 1, x, y);
 217                 }
 218         } else {
 219                 info->p_uv_addr = 0;
 220         }
 221 }
 222
 223 /* pin, prepare for scanout: */
 224 int omap_framebuffer_pin(struct drm_framebuffer *fb)
 225 {
 226         struct omap_framebuffer *omap_fb = to_omap_framebuffer(fb);
 227         int ret, i, n = fb->format->num_planes;
 228
 229         mutex_lock(&omap_fb->lock);
 230
 231         if (omap_fb->pin_count > 0) {
 232                 omap_fb->pin_count++;
 233                 mutex_unlock(&omap_fb->lock);
 234                 return 0;
 235         }
 236
 237         for (i = 0; i < n; i++) {
 238                 struct plane *plane = &omap_fb->planes[i];
 239                 ret = omap_gem_pin(fb->obj[i], &plane->dma_addr);
 240                 if (ret)
 241                         goto fail;
 242                 omap_gem_dma_sync_buffer(fb->obj[i], DMA_TO_DEVICE);
 243         }
 244
 245         omap_fb->pin_count++;
 246
 247         mutex_unlock(&omap_fb->lock);
 248
 249         return 0;
 250
 251 fail:
 252         for (i--; i >= 0; i--) {
 253                 struct plane *plane = &omap_fb->planes[i];
 254                 omap_gem_unpin(fb->obj[i]);
 255                 plane->dma_addr = 0;
 256         }
 257
 258         mutex_unlock(&omap_fb->lock);
 259
 260         return ret;
 261 }
 262
 263 /* unpin, no longer being scanned out: */
 264 void omap_framebuffer_unpin(struct drm_framebuffer *fb)
 265 {
 266         struct omap_framebuffer *omap_fb = to_omap_framebuffer(fb);
 267         int i, n = fb->format->num_planes;
 268
 269         mutex_lock(&omap_fb->lock);
 270
 271         omap_fb->pin_count--;
 272
 273         if (omap_fb->pin_count > 0) {
 274                 mutex_unlock(&omap_fb->lock);
 275                 return;
 276         }
 277
 278         for (i = 0; i < n; i++) {
 279                 struct plane *plane = &omap_fb->planes[i];
 280                 omap_gem_unpin(fb->obj[i]);
 281                 plane->dma_addr = 0;
 282         }
 283
 284         mutex_unlock(&omap_fb->lock);
 285 }
 286
 287 #ifdef CONFIG_DEBUG_FS
 288 void omap_framebuffer_describe(struct drm_framebuffer *fb, struct seq_file *m)
 289 {
 290         int i, n = fb->format->num_planes;
 291
 292         seq_printf(m, "fb: %dx%d@%4.4s\n", fb->width, fb->height,
 293                         (char *)&fb->format->format);
 294
 295         for (i = 0; i < n; i++) {
 296                 seq_printf(m, "   %d: offset=%d pitch=%d, obj: ",
 297                                 i, fb->offsets[n], fb->pitches[i]);
 298                 omap_gem_describe(fb->obj[i], m);
 299         }
 300 }
 301 #endif
 302
 303 struct drm_framebuffer *omap_framebuffer_create(struct drm_device *dev,
 304                 struct drm_file *file, const struct drm_mode_fb_cmd2 *mode_cmd)
 305 {
 306         const struct drm_format_info *info = drm_get_format_info(dev,
 307                                                                  mode_cmd);
 308         unsigned int num_planes = info->num_planes;
 309         struct drm_gem_object *bos[4];
 310         struct drm_framebuffer *fb;
 311         int i;
 312
 313         for (i = 0; i < num_planes; i++) {
 314                 bos[i] = drm_gem_object_lookup(file, mode_cmd->handles[i]);
 315                 if (!bos[i]) {
 316                         fb = ERR_PTR(-ENOENT);
 317                         goto error;
 318                 }
 319         }
 320
 321         fb = omap_framebuffer_init(dev, mode_cmd, bos);
 322         if (IS_ERR(fb))
 323                 goto error;
 324
 325         return fb;
 326
 327 error:
 328         while (--i >= 0)
 329                 drm_gem_object_put(bos[i]);
 330
 331         return fb;
 332 }
 333
 334 struct drm_framebuffer *omap_framebuffer_init(struct drm_device *dev,
 335                 const struct drm_mode_fb_cmd2 *mode_cmd, struct drm_gem_object **bos)
 336 {
 337         const struct drm_format_info *format = NULL;
 338         struct omap_framebuffer *omap_fb = NULL;
 339         struct drm_framebuffer *fb = NULL;
 340         unsigned int pitch = mode_cmd->pitches[0];
 341         int ret, i;
 342
 343         DBG("create framebuffer: dev=%p, mode_cmd=%p (%dx%d@%4.4s)",
 344                         dev, mode_cmd, mode_cmd->width, mode_cmd->height,
 345                         (char *)&mode_cmd->pixel_format);
 346
 347         format = drm_get_format_info(dev, mode_cmd);
 348
 349         for (i = 0; i < ARRAY_SIZE(formats); i++) {
 350                 if (formats[i] == mode_cmd->pixel_format)
 351                         break;
 352         }
 353
 354         if (!format || i == ARRAY_SIZE(formats)) {
 355                 dev_dbg(dev->dev, "unsupported pixel format: %4.4s\n",
 356                         (char *)&mode_cmd->pixel_format);
 357                 ret = -EINVAL;
 358                 goto fail;
 359         }
 360
 361         omap_fb = kzalloc(sizeof(*omap_fb), GFP_KERNEL);
 362         if (!omap_fb) {
 363                 ret = -ENOMEM;
 364                 goto fail;
 365         }
 366
 367         fb = &omap_fb->base;
 368         omap_fb->format = format;
 369         mutex_init(&omap_fb->lock);
 370
 371         /*
 372          * The code below assumes that no format use more than two planes, and
 373          * that the two planes of multiplane formats need the same number of
 374          * bytes per pixel.
 375          */
 376         if (format->num_planes == 2 && pitch != mode_cmd->pitches[1]) {
 377                 dev_dbg(dev->dev, "pitches differ between planes 0 and 1\n");
 378                 ret = -EINVAL;
 379                 goto fail;
 380         }
 381
 382         if (pitch % format->cpp[0]) {
 383                 dev_dbg(dev->dev,
 384                         "buffer pitch (%u bytes) is not a multiple of pixel size (%u bytes)\n",
 385                         pitch, format->cpp[0]);
 386                 ret = -EINVAL;
 387                 goto fail;
 388         }
 389
 390         for (i = 0; i < format->num_planes; i++) {
 391                 struct plane *plane = &omap_fb->planes[i];
 392                 unsigned int vsub = i == 0 ? 1 : format->vsub;
 393                 unsigned int size;
 394
 395                 size = pitch * mode_cmd->height / vsub;
 396
 397                 if (size > omap_gem_mmap_size(bos[i]) - mode_cmd->offsets[i]) {
 398                         dev_dbg(dev->dev,
 399                                 "provided buffer object is too small! %zu < %d\n",
 400                                 bos[i]->size - mode_cmd->offsets[i], size);
 401                         ret = -EINVAL;
 402                         goto fail;
 403                 }
 404
 405                 fb->obj[i]    = bos[i];
 406                 plane->dma_addr  = 0;
 407         }
 408
 409         drm_helper_mode_fill_fb_struct(dev, fb, mode_cmd);
 410
 411         ret = drm_framebuffer_init(dev, fb, &omap_framebuffer_funcs);
 412         if (ret) {
 413                 dev_err(dev->dev, "framebuffer init failed: %d\n", ret);
 414                 goto fail;
 415         }
 416
 417         DBG("create: FB ID: %d (%p)", fb->base.id, fb);
 418
 419         return fb;
 420
 421 fail:
 422         kfree(omap_fb);
 423
 424         return ERR_PTR(ret);
 425 }