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drm: Add fixed-point helper to get rounded integer values
author
Maíra Canal
<mcanal@igalia.com>
Fri, 12 May 2023 10:40:44 +0000
(07:40 -0300)
committer
Greg Kroah-Hartman
<gregkh@linuxfoundation.org>
Wed, 19 Jul 2023 14:21:18 +0000
(16:21 +0200)
[ Upstream commit
8b25320887d7feac98875546ea0f521628b745bb
]
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:
ab87f558dcfb
("drm/vkms: Fix RGB565 pixel conversion")
Signed-off-by: Sasha Levin <sashal@kernel.org>
include/drm/drm_fixed.h
patch
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diff --git
a/include/drm/drm_fixed.h
b/include/drm/drm_fixed.h
index
553210c
..
03cb890
100644
(file)
--- a/
include/drm/drm_fixed.h
+++ b/
include/drm/drm_fixed.h
@@
-70,6
+70,7
@@
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)
@@
-86,6
+87,11
@@
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)