omapdrm doesn't check if the width of the framebuffer and the color
format's bits-per-pixel match.
For example, using a display with a width of 1280, and a buffer
allocated with using 32 bits per pixel (i.e. 1280*4 = 5120 bytes), with
a 24 bits per pixel color format, leads to the following mismatch:
5120/3 = 1706.666... bytes. This causes bad colors and a tilt on the
screen.
Add a check into omapdrm to return an error if the user tries to use
such a combination.
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@xxxxxx>
---
drivers/gpu/drm/omapdrm/omap_fb.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/drivers/gpu/drm/omapdrm/omap_fb.c b/drivers/gpu/drm/omapdrm/omap_fb.c
index 2975096abdf5..bf98580223d0 100644
--- a/drivers/gpu/drm/omapdrm/omap_fb.c
+++ b/drivers/gpu/drm/omapdrm/omap_fb.c
@@ -463,6 +463,14 @@ struct drm_framebuffer *omap_framebuffer_init(struct drm_device *dev,
goto fail;
}
+ if (mode_cmd->width % format->planes[i].stride_bpp != 0) {
+ dev_err(dev->dev,
+ "buffer width (%d) is not a multiple of pixel width (%d)\n",
+ mode_cmd->width, format->planes[i].stride_bpp);
+ ret = -EINVAL;
+ goto fail;
+ }
+
size = pitch * mode_cmd->height / format->planes[i].sub_y;
if (size > (omap_gem_mmap_size(bos[i]) - mode_cmd->offsets[i])) {
--
1.9.1
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