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Diffstat (limited to 'drivers/gpu/drm/drm_writeback.c')
| -rw-r--r-- | drivers/gpu/drm/drm_writeback.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_writeback.c b/drivers/gpu/drm/drm_writeback.c index 4da5d6094721..b4a002e6d043 100644 --- a/drivers/gpu/drm/drm_writeback.c +++ b/drivers/gpu/drm/drm_writeback.c @@ -58,6 +58,12 @@ * framebuffer to be written by the writeback connector. This property is * similar to the FB_ID property on planes, but will always read as zero * and is not preserved across commits. + * If the width and height of the framebuffer do not match those of the + * attached CRTC, the driver must either fail or scale (not crop) the + * content to exactly fit the framebuffer. + * If the driver is unable to exactly fill the framebuffer for any reason, + * such as hardware scaler constraints or an odd width for a sub-sampled + * format, the writeback must fail instead of partially filling the buffer. * Userspace must set this property to an output buffer every time it * wishes the buffer to get filled. * |