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drm/vc4: Make sure that planes aren't scaled.

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We would scan out the memory around them if an upscale was attempted,
and would just scan out incorrectly for downscaling.

Signed-off-by: Eric Anholt <eric@anholt.net>
This commit is contained in:
Eric Anholt 2015-10-23 10:36:27 +01:00
parent 36f4f69a09
commit bf893acc16
1 changed files with 10 additions and 0 deletions
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10
drivers/gpu/drm/vc4/vc4_plane.c
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@ -157,6 +157,16 @@ static int vc4_plane_mode_set(struct drm_plane *plane,
int crtc_w = state->crtc_w;
int crtc_h = state->crtc_h;
if (state->crtc_w << 16 != state->src_w ||
state->crtc_h << 16 != state->src_h) {
/* We don't support scaling yet, which involves
* allocating the LBM memory for scaling temporary
* storage, and putting filter kernels in the HVS
* context.
*/
return -EINVAL;
}
if (crtc_x < 0) {
offset += drm_format_plane_cpp(fb->pixel_format, 0) * -crtc_x;
crtc_w += crtc_x;