drivers/gpu/drm/armada/armada_fb.c

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