drivers/gpu/drm/omapdrm/omap_fb.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/
   4  * Author: Rob Clark <rob@ti.com>
   5  */
   6
   7 #include <linux/seq_file.h>
   8
   9 #include <drm/drm_crtc.h>
  10 #include <drm/drm_modeset_helper.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;
  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         struct plane *plane = &omap_fb->planes[0];
 139         u32 x, y, orient = 0;
 140
 141         info->fourcc = fb->format->format;
 142
 143         info->pos_x      = state->crtc_x;
 144         info->pos_y      = state->crtc_y;
 145         info->out_width  = state->crtc_w;
 146         info->out_height = state->crtc_h;
 147         info->width      = state->src_w >> 16;
 148         info->height     = state->src_h >> 16;
 149
 150         /* DSS driver wants the w & h in rotated orientation */
 151         if (drm_rotation_90_or_270(state->rotation))
 152                 swap(info->width, info->height);
 153
 154         x = state->src_x >> 16;
 155         y = state->src_y >> 16;
 156
 157         if (omap_gem_flags(fb->obj[0]) & OMAP_BO_TILED) {
 158                 u32 w = state->src_w >> 16;
 159                 u32 h = state->src_h >> 16;
 160
 161                 orient = drm_rotation_to_tiler(state->rotation);
 162
 163                 /*
 164                  * omap_gem_rotated_paddr() wants the x & y in tiler units.
 165                  * Usually tiler unit size is the same as the pixel size, except
 166                  * for YUV422 formats, for which the tiler unit size is 32 bits
 167                  * and pixel size is 16 bits.
 168                  */
 169                 if (fb->format->format == DRM_FORMAT_UYVY ||
 170                                 fb->format->format == DRM_FORMAT_YUYV) {
 171                         x /= 2;
 172                         w /= 2;
 173                 }
 174
 175                 /* adjust x,y offset for invert: */
 176                 if (orient & MASK_Y_INVERT)
 177                         y += h - 1;
 178                 if (orient & MASK_X_INVERT)
 179                         x += w - 1;
 180
 181                 /* Note: x and y are in TILER units, not pixels */
 182                 omap_gem_rotated_dma_addr(fb->obj[0], orient, x, y,
 183                                           &info->paddr);
 184                 info->rotation_type = OMAP_DSS_ROT_TILER;
 185                 info->rotation = state->rotation ?: DRM_MODE_ROTATE_0;
 186                 /* Note: stride in TILER units, not pixels */
 187                 info->screen_width  = omap_gem_tiled_stride(fb->obj[0], orient);
 188         } else {
 189                 switch (state->rotation & DRM_MODE_ROTATE_MASK) {
 190                 case 0:
 191                 case DRM_MODE_ROTATE_0:
 192                         /* OK */
 193                         break;
 194
 195                 default:
 196                         dev_warn(fb->dev->dev,
 197                                 "rotation '%d' ignored for non-tiled fb\n",
 198                                 state->rotation);
 199                         break;
 200                 }
 201
 202                 info->paddr         = get_linear_addr(fb, format, 0, x, y);
 203                 info->rotation_type = OMAP_DSS_ROT_NONE;
 204                 info->rotation      = DRM_MODE_ROTATE_0;
 205                 info->screen_width  = fb->pitches[0];
 206         }
 207
 208         /* convert to pixels: */
 209         info->screen_width /= format->cpp[0];
 210
 211         if (fb->format->format == DRM_FORMAT_NV12) {
 212                 plane = &omap_fb->planes[1];
 213
 214                 if (info->rotation_type == OMAP_DSS_ROT_TILER) {
 215                         WARN_ON(!(omap_gem_flags(fb->obj[1]) & OMAP_BO_TILED));
 216                         omap_gem_rotated_dma_addr(fb->obj[1], orient, x/2, y/2,
 217                                                   &info->p_uv_addr);
 218                 } else {
 219                         info->p_uv_addr = get_linear_addr(fb, format, 1, x, y);
 220                 }
 221         } else {
 222                 info->p_uv_addr = 0;
 223         }
 224 }
 225
 226 /* pin, prepare for scanout: */
 227 int omap_framebuffer_pin(struct drm_framebuffer *fb)
 228 {
 229         struct omap_framebuffer *omap_fb = to_omap_framebuffer(fb);
 230         int ret, i, n = fb->format->num_planes;
 231
 232         mutex_lock(&omap_fb->lock);
 233
 234         if (omap_fb->pin_count > 0) {
 235                 omap_fb->pin_count++;
 236                 mutex_unlock(&omap_fb->lock);
 237                 return 0;
 238         }
 239
 240         for (i = 0; i < n; i++) {
 241                 struct plane *plane = &omap_fb->planes[i];
 242                 ret = omap_gem_pin(fb->obj[i], &plane->dma_addr);
 243                 if (ret)
 244                         goto fail;
 245                 omap_gem_dma_sync_buffer(fb->obj[i], DMA_TO_DEVICE);
 246         }
 247
 248         omap_fb->pin_count++;
 249
 250         mutex_unlock(&omap_fb->lock);
 251
 252         return 0;
 253
 254 fail:
 255         for (i--; i >= 0; i--) {
 256                 struct plane *plane = &omap_fb->planes[i];
 257                 omap_gem_unpin(fb->obj[i]);
 258                 plane->dma_addr = 0;
 259         }
 260
 261         mutex_unlock(&omap_fb->lock);
 262
 263         return ret;
 264 }
 265
 266 /* unpin, no longer being scanned out: */
 267 void omap_framebuffer_unpin(struct drm_framebuffer *fb)
 268 {
 269         struct omap_framebuffer *omap_fb = to_omap_framebuffer(fb);
 270         int i, n = fb->format->num_planes;
 271
 272         mutex_lock(&omap_fb->lock);
 273
 274         omap_fb->pin_count--;
 275
 276         if (omap_fb->pin_count > 0) {
 277                 mutex_unlock(&omap_fb->lock);
 278                 return;
 279         }
 280
 281         for (i = 0; i < n; i++) {
 282                 struct plane *plane = &omap_fb->planes[i];
 283                 omap_gem_unpin(fb->obj[i]);
 284                 plane->dma_addr = 0;
 285         }
 286
 287         mutex_unlock(&omap_fb->lock);
 288 }
 289
 290 #ifdef CONFIG_DEBUG_FS
 291 void omap_framebuffer_describe(struct drm_framebuffer *fb, struct seq_file *m)
 292 {
 293         int i, n = fb->format->num_planes;
 294
 295         seq_printf(m, "fb: %dx%d@%4.4s\n", fb->width, fb->height,
 296                         (char *)&fb->format->format);
 297
 298         for (i = 0; i < n; i++) {
 299                 seq_printf(m, "   %d: offset=%d pitch=%d, obj: ",
 300                                 i, fb->offsets[n], fb->pitches[i]);
 301                 omap_gem_describe(fb->obj[i], m);
 302         }
 303 }
 304 #endif
 305
 306 struct drm_framebuffer *omap_framebuffer_create(struct drm_device *dev,
 307                 struct drm_file *file, const struct drm_mode_fb_cmd2 *mode_cmd)
 308 {
 309         const struct drm_format_info *info = drm_get_format_info(dev,
 310                                                                  mode_cmd);
 311         unsigned int num_planes = info->num_planes;
 312         struct drm_gem_object *bos[4];
 313         struct drm_framebuffer *fb;
 314         int i;
 315
 316         for (i = 0; i < num_planes; i++) {
 317                 bos[i] = drm_gem_object_lookup(file, mode_cmd->handles[i]);
 318                 if (!bos[i]) {
 319                         fb = ERR_PTR(-ENOENT);
 320                         goto error;
 321                 }
 322         }
 323
 324         fb = omap_framebuffer_init(dev, mode_cmd, bos);
 325         if (IS_ERR(fb))
 326                 goto error;
 327
 328         return fb;
 329
 330 error:
 331         while (--i >= 0)
 332                 drm_gem_object_put_unlocked(bos[i]);
 333
 334         return fb;
 335 }
 336
 337 struct drm_framebuffer *omap_framebuffer_init(struct drm_device *dev,
 338                 const struct drm_mode_fb_cmd2 *mode_cmd, struct drm_gem_object **bos)
 339 {
 340         const struct drm_format_info *format = NULL;
 341         struct omap_framebuffer *omap_fb = NULL;
 342         struct drm_framebuffer *fb = NULL;
 343         unsigned int pitch = mode_cmd->pitches[0];
 344         int ret, i;
 345
 346         DBG("create framebuffer: dev=%p, mode_cmd=%p (%dx%d@%4.4s)",
 347                         dev, mode_cmd, mode_cmd->width, mode_cmd->height,
 348                         (char *)&mode_cmd->pixel_format);
 349
 350         format = drm_get_format_info(dev, mode_cmd);
 351
 352         for (i = 0; i < ARRAY_SIZE(formats); i++) {
 353                 if (formats[i] == mode_cmd->pixel_format)
 354                         break;
 355         }
 356
 357         if (!format || i == ARRAY_SIZE(formats)) {
 358                 dev_dbg(dev->dev, "unsupported pixel format: %4.4s\n",
 359                         (char *)&mode_cmd->pixel_format);
 360                 ret = -EINVAL;
 361                 goto fail;
 362         }
 363
 364         omap_fb = kzalloc(sizeof(*omap_fb), GFP_KERNEL);
 365         if (!omap_fb) {
 366                 ret = -ENOMEM;
 367                 goto fail;
 368         }
 369
 370         fb = &omap_fb->base;
 371         omap_fb->format = format;
 372         mutex_init(&omap_fb->lock);
 373
 374         /*
 375          * The code below assumes that no format use more than two planes, and
 376          * that the two planes of multiplane formats need the same number of
 377          * bytes per pixel.
 378          */
 379         if (format->num_planes == 2 && pitch != mode_cmd->pitches[1]) {
 380                 dev_dbg(dev->dev, "pitches differ between planes 0 and 1\n");
 381                 ret = -EINVAL;
 382                 goto fail;
 383         }
 384
 385         if (pitch % format->cpp[0]) {
 386                 dev_dbg(dev->dev,
 387                         "buffer pitch (%u bytes) is not a multiple of pixel size (%u bytes)\n",
 388                         pitch, format->cpp[0]);
 389                 ret = -EINVAL;
 390                 goto fail;
 391         }
 392
 393         for (i = 0; i < format->num_planes; i++) {
 394                 struct plane *plane = &omap_fb->planes[i];
 395                 unsigned int vsub = i == 0 ? 1 : format->vsub;
 396                 unsigned int size;
 397
 398                 size = pitch * mode_cmd->height / vsub;
 399
 400                 if (size > omap_gem_mmap_size(bos[i]) - mode_cmd->offsets[i]) {
 401                         dev_dbg(dev->dev,
 402                                 "provided buffer object is too small! %zu < %d\n",
 403                                 bos[i]->size - mode_cmd->offsets[i], size);
 404                         ret = -EINVAL;
 405                         goto fail;
 406                 }
 407
 408                 fb->obj[i]    = bos[i];
 409                 plane->dma_addr  = 0;
 410         }
 411
 412         drm_helper_mode_fill_fb_struct(dev, fb, mode_cmd);
 413
 414         ret = drm_framebuffer_init(dev, fb, &omap_framebuffer_funcs);
 415         if (ret) {
 416                 dev_err(dev->dev, "framebuffer init failed: %d\n", ret);
 417                 goto fail;
 418         }
 419
 420         DBG("create: FB ID: %d (%p)", fb->base.id, fb);
 421
 422         return fb;
 423
 424 fail:
 425         kfree(omap_fb);
 426
 427         return ERR_PTR(ret);
 428 }