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drm/ast: Check video-mode requirements against VRAM size

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Each video mode's primary plane requires a minimum amount of video
memory. For double buffering, this is at most half the available
VRAM. Check this constraint.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Acked-by: Gerd Hoffmann <kraxel@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191107083404.6852-3-tzimmermann@suse.de
This commit is contained in:
Thomas Zimmermann 2019-11-07 09:33:57 +01:00
parent 5a1505e7e6
commit 9253f830c9
1 changed files with 24 additions and 1 deletions
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25
drivers/gpu/drm/ast/ast_main.c
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@ -387,8 +387,31 @@ static int ast_get_dram_info(struct drm_device *dev)
return 0;
}
enum drm_mode_status ast_mode_config_mode_valid(struct drm_device *dev,
const struct drm_display_mode *mode)
{
static const unsigned long max_bpp = 4; /* DRM_FORMAT_XRGBA8888 */
struct ast_private *ast = dev->dev_private;
unsigned long fbsize, fbpages, max_fbpages;
/* To support double buffering, a framebuffer may not
* consume more than half of the available VRAM.
*/
max_fbpages = (ast->vram_size / 2) >> PAGE_SHIFT;
fbsize = mode->hdisplay * mode->vdisplay * max_bpp;
fbpages = DIV_ROUND_UP(fbsize, PAGE_SIZE);
if (fbpages > max_fbpages)
return MODE_MEM;
return MODE_OK;
}
static const struct drm_mode_config_funcs ast_mode_funcs = {
.fb_create = drm_gem_fb_create
.fb_create = drm_gem_fb_create,
.mode_valid = ast_mode_config_mode_valid,
};
static u32 ast_get_vram_info(struct drm_device *dev)