drivers/gpu/drm/armada/armada_fb.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2012 Russell King
   4  */
   5
   6 #include <drm/drm_modeset_helper.h>
   7 #include <drm/drm_fb_helper.h>
   8 #include <drm/drm_fourcc.h>
   9 #include <drm/drm_gem_framebuffer_helper.h>
  10
  11 #include "armada_drm.h"
  12 #include "armada_fb.h"
  13 #include "armada_gem.h"
  14 #include "armada_hw.h"
  15
  16 static const struct drm_framebuffer_funcs armada_fb_funcs = {
  17         .destroy        = drm_gem_fb_destroy,
  18         .create_handle  = drm_gem_fb_create_handle,
  19 };
  20
  21 struct armada_framebuffer *armada_framebuffer_create(struct drm_device *dev,
  22         const struct drm_mode_fb_cmd2 *mode, struct armada_gem_object *obj)
  23 {
  24         struct armada_framebuffer *dfb;
  25         uint8_t format, config;
  26         int ret;
  27
  28         switch (mode->pixel_format) {
  29 #define FMT(drm, fmt, mod)              \
  30         case DRM_FORMAT_##drm:          \
  31                 format = CFG_##fmt;     \
  32                 config = mod;           \
  33                 break
  34         FMT(RGB565,     565,            CFG_SWAPRB);
  35         FMT(BGR565,     565,            0);
  36         FMT(ARGB1555,   1555,           CFG_SWAPRB);
  37         FMT(ABGR1555,   1555,           0);
  38         FMT(RGB888,     888PACK,        CFG_SWAPRB);
  39         FMT(BGR888,     888PACK,        0);
  40         FMT(XRGB8888,   X888,           CFG_SWAPRB);
  41         FMT(XBGR8888,   X888,           0);
  42         FMT(ARGB8888,   8888,           CFG_SWAPRB);
  43         FMT(ABGR8888,   8888,           0);
  44         FMT(YUYV,       422PACK,        CFG_YUV2RGB | CFG_SWAPYU | CFG_SWAPUV);
  45         FMT(UYVY,       422PACK,        CFG_YUV2RGB);
  46         FMT(VYUY,       422PACK,        CFG_YUV2RGB | CFG_SWAPUV);
  47         FMT(YVYU,       422PACK,        CFG_YUV2RGB | CFG_SWAPYU);
  48         FMT(YUV422,     422,            CFG_YUV2RGB);
  49         FMT(YVU422,     422,            CFG_YUV2RGB | CFG_SWAPUV);
  50         FMT(YUV420,     420,            CFG_YUV2RGB);
  51         FMT(YVU420,     420,            CFG_YUV2RGB | CFG_SWAPUV);
  52         FMT(C8,         PSEUDO8,        0);
  53 #undef FMT
  54         default:
  55                 return ERR_PTR(-EINVAL);
  56         }
  57
  58         dfb = kzalloc(sizeof(*dfb), GFP_KERNEL);
  59         if (!dfb) {
  60                 DRM_ERROR("failed to allocate Armada fb object\n");
  61                 return ERR_PTR(-ENOMEM);
  62         }
  63
  64         dfb->fmt = format;
  65         dfb->mod = config;
  66         dfb->fb.obj[0] = &obj->obj;
  67
  68         drm_helper_mode_fill_fb_struct(dev, &dfb->fb, mode);
  69
  70         ret = drm_framebuffer_init(dev, &dfb->fb, &armada_fb_funcs);
  71         if (ret) {
  72                 kfree(dfb);
  73                 return ERR_PTR(ret);
  74         }
  75
  76         /*
  77          * Take a reference on our object as we're successful - the
  78          * caller already holds a reference, which keeps us safe for
  79          * the above call, but the caller will drop their reference
  80          * to it.  Hence we need to take our own reference.
  81          */
  82         drm_gem_object_get(&obj->obj);
  83
  84         return dfb;
  85 }
  86
  87 struct drm_framebuffer *armada_fb_create(struct drm_device *dev,
  88         struct drm_file *dfile, const struct drm_mode_fb_cmd2 *mode)
  89 {
  90         const struct drm_format_info *info = drm_get_format_info(dev, mode);
  91         struct armada_gem_object *obj;
  92         struct armada_framebuffer *dfb;
  93         int ret;
  94
  95         DRM_DEBUG_DRIVER("w%u h%u pf%08x f%u p%u,%u,%u\n",
  96                 mode->width, mode->height, mode->pixel_format,
  97                 mode->flags, mode->pitches[0], mode->pitches[1],
  98                 mode->pitches[2]);
  99
 100         /* We can only handle a single plane at the moment */
 101         if (info->num_planes > 1 &&
 102             (mode->handles[0] != mode->handles[1] ||
 103              mode->handles[0] != mode->handles[2])) {
 104                 ret = -EINVAL;
 105                 goto err;
 106         }
 107
 108         obj = armada_gem_object_lookup(dfile, mode->handles[0]);
 109         if (!obj) {
 110                 ret = -ENOENT;
 111                 goto err;
 112         }
 113
 114         if (obj->obj.import_attach && !obj->sgt) {
 115                 ret = armada_gem_map_import(obj);
 116                 if (ret)
 117                         goto err_unref;
 118         }
 119
 120         /* Framebuffer objects must have a valid device address for scanout */
 121         if (!obj->mapped) {
 122                 ret = -EINVAL;
 123                 goto err_unref;
 124         }
 125
 126         dfb = armada_framebuffer_create(dev, mode, obj);
 127         if (IS_ERR(dfb)) {
 128                 ret = PTR_ERR(dfb);
 129                 goto err;
 130         }
 131
 132         drm_gem_object_put(&obj->obj);
 133
 134         return &dfb->fb;
 135
 136  err_unref:
 137         drm_gem_object_put(&obj->obj);
 138  err:
 139         DRM_ERROR("failed to initialize framebuffer: %d\n", ret);
 140         return ERR_PTR(ret);
 141 }