On Sat, Jan 2, 2021 at 3:02 PM Bas Nieuwenhuizen
<bas@xxxxxxxxxxxxxxxxxxx> 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 <bas@xxxxxxxxxxxxxxxxxxx>
> Fixes: 816853f9dc40 ("drm/amd/display: Set new format info for converted metadata.")
> ---
> drivers/gpu/drm/drm_plane.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/drm_plane.c b/drivers/gpu/drm/drm_plane.c
> index e6231947f987..f5085990cfac 100644
> --- a/drivers/gpu/drm/drm_plane.c
> +++ b/drivers/gpu/drm/drm_plane.c
> @@ -1163,7 +1163,7 @@ int drm_mode_page_flip_ioctl(struct drm_device *dev,
> if (ret)
> goto out;
>
> - if (old_fb->format != fb->format) {
> + if (old_fb->format->format != fb->format->format) {
This was btw. the original way before Ville made it more strict about
4 years ago, to catch issues related to tiling, and more complex
layouts, like the dcc tiling/retiling introduced by your modifier
patches. That's why I hope my alternative patch is a good solution for
atomic drivers while keeping the strictness for potential legacy
drivers.
-mario
> 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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