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author | Arthur Grillo <arthurgrillo@riseup.net> | 2024-03-16 19:25:20 +0300 |
---|---|---|
committer | Sasha Levin <sashal@kernel.org> | 2024-03-27 01:17:35 +0300 |
commit | be300fb44a5c1efb27be55a52fb6b1656af68234 (patch) | |
tree | 5f3700b715b15241ee5f08c71499b8df7fa48051 | |
parent | 68fb3d6e17506daa3bb69aa9f4fbfbace8b628a3 (diff) | |
download | linux-be300fb44a5c1efb27be55a52fb6b1656af68234.tar.xz |
drm: Fix drm_fixp2int_round() making it add 0.5
[ Upstream commit 807f96abdf14c80f534c78f2d854c2590963345c ]
As well noted by Pekka[1], the rounding of drm_fixp2int_round is wrong.
To round a number, you need to add 0.5 to the number and floor that,
drm_fixp2int_round() is adding 0.0000076. Make it add 0.5.
[1]: https://lore.kernel.org/all/20240301135327.22efe0dd.pekka.paalanen@collabora.com/
Fixes: 8b25320887d7 ("drm: Add fixed-point helper to get rounded integer values")
Suggested-by: Pekka Paalanen <pekka.paalanen@collabora.com>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Reviewed-by: Melissa Wen <mwen@igalia.com>
Signed-off-by: Arthur Grillo <arthurgrillo@riseup.net>
Signed-off-by: Melissa Wen <melissa.srw@gmail.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240316-drm_fixed-v2-1-c1bc2665b5ed@riseup.net
Signed-off-by: Sasha Levin <sashal@kernel.org>
-rw-r--r-- | include/drm/drm_fixed.h | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/include/drm/drm_fixed.h b/include/drm/drm_fixed.h index 0c9f917a4d4b..81572d32db0c 100644 --- a/include/drm/drm_fixed.h +++ b/include/drm/drm_fixed.h @@ -71,7 +71,6 @@ static inline u32 dfixed_div(fixed20_12 A, fixed20_12 B) } #define DRM_FIXED_POINT 32 -#define DRM_FIXED_POINT_HALF 16 #define DRM_FIXED_ONE (1ULL << DRM_FIXED_POINT) #define DRM_FIXED_DECIMAL_MASK (DRM_FIXED_ONE - 1) #define DRM_FIXED_DIGITS_MASK (~DRM_FIXED_DECIMAL_MASK) @@ -90,7 +89,7 @@ static inline int drm_fixp2int(s64 a) static inline int drm_fixp2int_round(s64 a) { - return drm_fixp2int(a + (1 << (DRM_FIXED_POINT_HALF - 1))); + return drm_fixp2int(a + DRM_FIXED_ONE / 2); } static inline int drm_fixp2int_ceil(s64 a) |