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drm: Add fixed-point helper to get rounded integer values 

[ Upstream commit 8b25320887 ]

Create a new fixed-point helper to allow us to return the rounded value
of our fixed point value.

[v2]:
    * Create the function drm_fixp2int_round() (Melissa Wen).
[v3]:
    * Use drm_fixp2int() instead of shifting manually (Arthur Grillo).

Signed-off-by: Maíra Canal <mcanal@igalia.com>
Reviewed-by: Arthur Grillo <arthurgrillo@riseup.net>
Signed-off-by: Maíra Canal <mairacanal@riseup.net>
Link: https://patchwork.freedesktop.org/patch/msgid/20230512104044.65034-1-mcanal@igalia.com
Stable-dep-of: ab87f558dc ("drm/vkms: Fix RGB565 pixel conversion")
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Maíra Canal 2023-05-12 07:40:44 -03:00 committed by Greg Kroah-Hartman
parent 484f8839a4
commit 20e04b0127
1 changed files with 6 additions and 0 deletions
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6
include/drm/drm_fixed.h
View File

@ -71,6 +71,7 @@ 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)
@ -87,6 +88,11 @@ static inline int drm_fixp2int(s64 a)
return ((s64)a) >> DRM_FIXED_POINT;
}
static inline int drm_fixp2int_round(s64 a)
{
return drm_fixp2int(a + (1 << (DRM_FIXED_POINT_HALF - 1)));
}
static inline int drm_fixp2int_ceil(s64 a)
{
if (a > 0)