[PATCH] drm: remove DRM_FORMAT_NV12MT

[Daniel Vetter]

On Wed, Feb 04, 2015 at 11:30:23AM +0900, Joonyoung Shim wrote:
> +Cc Inki,
> 
> Hi,
> 
> On 02/04/2015 12:48 AM, Daniel Vetter wrote:
> > 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.
> 
> So it was tried to support NV12MT in format_check. I really welcome the
> new way.

Yeah, the new way should also make sharing buffers between devices easier
since we'll have a fairly rigid standard about things. On irc we've
discussed that we probably need a VENDOR_MPEG modifier range so that we
can have cross-chip-vendor standardized modifiers for the various
macroblock tiling layouts seen in video streams (64x32, 16x16).

> Acked-by: Joonyoung Shim <jy0922.shim at samsung.com>

Thanks, I've picked the patch up into my drm-misc branch.
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch