2015-02-03 Daniel Vetter <daniel.vetter at ffwll.ch>:
> So this has been merged originally in
>
> commit 83052d4d5cd518332440bb4ee63d68bb5f744e0f
> Author: Seung-Woo Kim <sw0312.kim at samsung.com>
> Date: Thu Dec 15 15:40:55 2011 +0900
>
> drm: Add multi buffer plane pixel formats
>
> which hasn't seen a lot of review really. The problem is that it's not
> a real pixel format, but just a different way to lay out NV12 pixels
> in macroblocks, i.e. a tiling format.
>
> The new way of doing this is with the soon-to-be-merge fb modifiers.
>
> This was brough up in some long irc discussion around the entire
> topic, as an example of where things have gone wrong. Luckily we can
> correct the mistake:
> - The kms side support for NV12MT is all dead code because
> format_check in drm_crtc.c never accepted NV12MT.
> - The gem side for the gsc support doesn't look better: The code
> forgets to set the pixel format and makes a big mess with the tiling
> mode bits, inadvertedly setting them all.
>
> Conclusion: This never really worked (at least not in upstream) and
> hence we can savely correct our mistake here.
>
> Cc: Seung-Woo Kim <sw0312.kim at samsung.com>
> Cc: Inki Dae <inki.dae at samsung.com>
> Cc: Kyungmin Park <kyungmin.park at samsung.com>
> Cc: Rob Clark <robclark at freedesktop.org>
> Cc: Daniel Stone <daniel at fooishbar.org>
> Cc: Damien Lespiau <damien.lespiau at intel.com>
> Signed-off-by: Daniel Vetter <daniel.vetter at intel.com>
> ---
> drivers/gpu/drm/exynos/exynos_drm_fimc.c | 14 ++------------
> drivers/gpu/drm/exynos/exynos_drm_gsc.c | 6 ------
> drivers/gpu/drm/exynos/exynos_drm_plane.c | 1 -
> drivers/gpu/drm/exynos/exynos_mixer.c | 2 --
> include/uapi/drm/drm_fourcc.h | 3 ---
> 5 files changed, 2 insertions(+), 24 deletions(-)
That seems good to me.
Reviewed-by: Gustavo Padovan <gustavo.padovan at collabora.co.uk>
Gustavo
