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| author | Tomi Valkeinen <tomi.valkeinen@ti.com> | 2014-09-25 19:24:28 +0000 |
|---|---|---|
| committer | Tomi Valkeinen <tomi.valkeinen@ti.com> | 2015-03-24 13:50:55 +0200 |
| commit | 2dab0bab6b749590086d44a04f9debc4fe894fd6 (patch) | |
| tree | df9a64ab389c77891e575d835862659edb6e1256 /drivers/gpu/drm/omapdrm | |
| parent | 925e4940489a792b4aaf601c22c1943fbd9fd558 (diff) | |
| download | linux-2dab0bab6b749590086d44a04f9debc4fe894fd6.tar.bz2 | |
drm/omap: handle incompatible buffer stride and pixel size
omapdrm doesn't check if the pitch of the framebuffer and the color
format's bits-per-pixel are compatible. omapdss requires that the stride
of a buffer is an integer number of pixels
For example, when using modetest with a display that has x resolution of
1280, and using packed 24 RGB mode (3 bytes per pixel), modetest
allocates a buffer with a byte stride of 4 * 1280 = 5120. But 5120 / 3 =
1706.666... pixels, which causes wrong 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.
Note: this is not a HW requirement at least for non-rotation use cases,
but a SW driver requirement. In the future we should study if also
rotation use cases are fine with any stride size, and if so, change the
driver to allow these strides.
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Diffstat (limited to 'drivers/gpu/drm/omapdrm')
| -rw-r--r-- | drivers/gpu/drm/omapdrm/omap_fb.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/gpu/drm/omapdrm/omap_fb.c b/drivers/gpu/drm/omapdrm/omap_fb.c index 3c6488e89788..b2c1a29cc12b 100644 --- a/drivers/gpu/drm/omapdrm/omap_fb.c +++ b/drivers/gpu/drm/omapdrm/omap_fb.c @@ -423,6 +423,14 @@ struct drm_framebuffer *omap_framebuffer_init(struct drm_device *dev, goto fail; } + if (pitch % format->planes[i].stride_bpp != 0) { + dev_err(dev->dev, + "buffer pitch (%d bytes) is not a multiple of pixel size (%d bytes)\n", + pitch, 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])) { |