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drm_fourcc: Document linear modifier

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Not setting the fb modifiers flag is something different from setting
the fb modifiers to 0 (which means explicitly linear). We kinda failed
to document that properly. Spotted by Kristian.

Cc: hoegsberg@google.com
Reviewed-by: Kristian H. Kristensen <hoegsberg@google.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1478694996-4200-1-git-send-email-daniel.vetter@ffwll.ch
This commit is contained in:
Daniel Vetter 2016-11-09 13:36:36 +01:00
parent 697cc9c8a2
commit b9fb2a21ac
1 changed files with 10 additions and 0 deletions
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10
include/uapi/drm/drm_fourcc.h
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@ -172,6 +172,16 @@ extern "C" {
* authoritative source for all of these.
*/
/*
* Linear Layout
*
* Just plain linear layout. Note that this is different from no specifying any
* modifier (e.g. not setting DRM_MODE_FB_MODIFIERS in the DRM_ADDFB2 ioctl),
* which tells the driver to also take driver-internal information into account
* and so might actually result in a tiled framebuffer.
*/
#define DRM_FORMAT_MOD_LINEAR fourcc_mod_code(NONE, 0)
/* Intel framebuffer modifiers */
/*