linux-kernel - Re: [Intel-gfx] [PATCH v2] drm: add fourcc codes for 16bit R and GR

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Message-ID: <20170104101918.GE2136@imgtec.com>
Date:   Wed, 4 Jan 2017 10:19:18 +0000
From:   Eric Engestrom <eric.engestrom@...tec.com>
To:     Rainer Hochecker <fernetmenta@...i.tv>
CC:     Daniel Vetter <daniel@...ll.ch>,
        Jani Nikula <jani.nikula@...ux.intel.com>, <ben@...dawsk.net>,
        <intel-gfx@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>,
        <dri-devel@...ts.freedesktop.org>, <fernetmenta@...ine.de>
Subject: Re: [Intel-gfx] [PATCH v2] drm: add fourcc codes for 16bit R and GR

On Wednesday, 2017-01-04 11:06:09 +0200, Jani Nikula wrote:
> On Wed, 04 Jan 2017, Daniel Vetter <daniel@...ll.ch> wrote:
> > On Tue, Jan 03, 2017 at 08:02:07PM +0100, Rainer Hochecker wrote:
> >> From: Rainer Hochecker <fernetmenta@...ine.de>
> >> 
> >> Now sent with git send-email:
> >> 
> >> Signed-off-by: Rainer Hochecker <fernetmenta@...ine.de>
> >> ---
> >>  include/uapi/drm/drm_fourcc.h | 7 +++++++
> >>  1 file changed, 7 insertions(+)
> >> 
> >> diff --git a/include/uapi/drm/drm_fourcc.h b/include/uapi/drm/drm_fourcc.h
> >> index a5890bf..f1ef9cb 100644
> >> --- a/include/uapi/drm/drm_fourcc.h
> >> +++ b/include/uapi/drm/drm_fourcc.h
> >> @@ -41,10 +41,17 @@ extern "C" {
> >>  /* 8 bpp Red */
> >>  #define DRM_FORMAT_R8		fourcc_code('R', '8', ' ', ' ') /* [7:0] R */
> >>  
> >> +/* 16 bpp Red */
> >> +#define DRM_FORMAT_R16		fourcc_code('R', '1', '6', ' ') /* [15:0] R */
> >> +
> >>  /* 16 bpp RG */
> >>  #define DRM_FORMAT_RG88		fourcc_code('R', 'G', '8', '8') /* [15:0] R:G 8:8 little endian */
> >>  #define DRM_FORMAT_GR88		fourcc_code('G', 'R', '8', '8') /* [15:0] G:R 8:8 little endian */
> >>  
> >> +/* 32 bpp GR */
> >> +#define DRM_FORMAT_RG32		fourcc_code('R', 'G', '3', '2') /* [31:0] G:R 16:16 little endian */

Also, s/G:R/R:G/ in the comment above :)

> >> +#define DRM_FORMAT_GR32		fourcc_code('G', 'R', '3', '2') /* [31:0] G:R 16:16 little endian */
> >
> > Now the define's name is inconsistent, since that would suggest a 5 bpp
> > format with 3 bits for R and 2 bits for G. I think what we want here for
> > consistency is _RG16_16 and _GR16_16, along the lines of what Ville
> > suggested.
> >
> > Sorry that this is such a bikeshed heaven ;-)
> 
> If there's going to be another version, please fix the commit message
> while at it. "Now sent with git send-email" is useless for posterity.
> 
> BR,
> Jani.
> 
> 
> > -Daniel
> >
> >> +
> >>  /* 8 bpp RGB */
> >>  #define DRM_FORMAT_RGB332	fourcc_code('R', 'G', 'B', '8') /* [7:0] R:G:B 3:3:2 */
> >>  #define DRM_FORMAT_BGR233	fourcc_code('B', 'G', 'R', '8') /* [7:0] B:G:R 2:3:3 */
> >> -- 
> >> 2.9.3
> >> 
> 
> -- 
> Jani Nikula, Intel Open Source Technology Center