korg/linux
0
0
Fork 0
mirror of https://mirrors.bfsu.edu.cn/git/linux.git synced 2024-12-12 13:34:10 +08:00
Code Issues Packages Projects Releases Wiki Activity

drm/fourcc: fix Amlogic format modifier masks

Browse Source 
The comment says the layout and options use 8 bits, and the shift
uses 8 bits. However the mask is 0xf, ie. 0b00001111 (4 bits).

This could be surprising when introducing new layouts or options
that take more than 4 bits, as this would silently drop the high
bits.

Make the masks consistent with the comment and the shift.

Found when writing a drm_info patch [1].

[1]: https://github.com/ascent12/drm_info/pull/67

Signed-off-by: Simon Ser <contact@emersion.fr>
Fixes: d6528ec883 ("drm/fourcc: Add modifier definitions for describing Amlogic Video Framebuffer Compression")
Cc: Neil Armstrong <narmstrong@baylibre.com>
Cc: Sam Ravnborg <sam@ravnborg.org>
Cc: Kevin Hilman <khilman@baylibre.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Acked-by: Neil Armstrong <narmstrong@baylibre.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210110125103.15447-1-contact@emersion.fr
This commit is contained in:
Simon Ser 2021-01-10 13:51:03 +01:00
parent dc25e3776e
commit cc3283f8f4
No known key found for this signature in database
GPG Key ID: 0FDE7BE0E88F5E48
1 changed files with 2 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
include/uapi/drm/drm_fourcc.h
View File

@ -1036,9 +1036,9 @@ drm_fourcc_canonicalize_nvidia_format_mod(__u64 modifier)
* Not all combinations are valid, and different SoCs may support different
* combinations of layout and options.
*/
#define __fourcc_mod_amlogic_layout_mask 0xf
#define __fourcc_mod_amlogic_layout_mask 0xff
#define __fourcc_mod_amlogic_options_shift 8
#define __fourcc_mod_amlogic_options_mask 0xf
#define __fourcc_mod_amlogic_options_mask 0xff
#define DRM_FORMAT_MOD_AMLOGIC_FBC(__layout, __options) \
fourcc_mod_code(AMLOGIC, \