On Sat, Jan 9, 2021 at 9:11 PM Bas Nieuwenhuizen
<b...@basnieuwenhuizen.nl> wrote:
>
> With modifiers one can actually have different format_info structs
> for the same format, which now matters for AMDGPU since we convert
> implicit modifiers to explicit modifiers with multiple planes.
>
> I checked other drivers and it doesn't look like they end up triggering
> this case so I think this is safe to relax.
>
> Signed-off-by: Bas Nieuwenhuizen <b...@basnieuwenhuizen.nl>
> Reviewed-by: Daniel Vetter <daniel.vet...@ffwll.ch>
> Reviewed-by: Zhan Liu <zhan....@amd.com>
> Acked-by: Christian König <christian.koe...@amd.com>
> Acked-by: Alex Deucher <alexander.deuc...@amd.com>
> Fixes: 816853f9dc40 ("drm/amd/display: Set new format info for converted
> metadata.")
Do you have commit rights to drm-misc or do you need someone to commit
this for you?
Thanks!
Alex
> ---
> drivers/gpu/drm/drm_plane.c | 9 ++++++++-
> 1 file changed, 8 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/drm_plane.c b/drivers/gpu/drm/drm_plane.c
> index e6231947f987..a0cb746bcb0a 100644
> --- a/drivers/gpu/drm/drm_plane.c
> +++ b/drivers/gpu/drm/drm_plane.c
> @@ -1163,7 +1163,14 @@ int drm_mode_page_flip_ioctl(struct drm_device *dev,
> if (ret)
> goto out;
>
> - if (old_fb->format != fb->format) {
> + /*
> + * Only check the FOURCC format code, excluding modifiers. This is
> + * enough for all legacy drivers. Atomic drivers have their own
> + * checks in their ->atomic_check implementation, which will
> + * return -EINVAL if any hw or driver constraint is violated due
> + * to modifier changes.
> + */
> + if (old_fb->format->format != fb->format->format) {
> DRM_DEBUG_KMS("Page flip is not allowed to change frame
> buffer format.\n");
> ret = -EINVAL;
> goto out;
> --
> 2.29.2
>
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> amd-...@lists.freedesktop.org
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