On 16/03/2024 08:59, Arthur Grillo wrote:
On 12/03/24 15:27, Melissa Wen wrote:
On 03/06, Arthur Grillo wrote:
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@xxxxxxxxxxxxx/
Hi Arthur,
thanks for addressing this issue.
Please, add a fix tag to the commit that you are fixing, so we can
easily backport. Might be this commit:
https://cgit.freedesktop.org/drm/drm-misc/commit/drivers/gpu/drm/vkms?id=ab87f558dcfb2562c3497e89600dec798a446665
Wouldn't be this commit instead?
https://cgit.freedesktop.org/drm/drm-misc/commit/?id=8b25320887d7feac98875546ea0f521628b745bb
Yes, you're right!
Melissa
Best Regards,
~Arthur Grillo
Suggested-by: Pekka Paalanen <pekka.paalanen@xxxxxxxxxxxxx>
Signed-off-by: Arthur Grillo <arthurgrillo@xxxxxxxxxx>
---
include/drm/drm_fixed.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/include/drm/drm_fixed.h b/include/drm/drm_fixed.h
index 0c9f917a4d4b..de3a79909ac9 100644
--- a/include/drm/drm_fixed.h
+++ b/include/drm/drm_fixed.h
@@ -90,7 +90,7 @@ 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)));
Also, this is the only usage of DRM_FIXED_POINT_HALF. Can you also
remove it as it won't be used anymore?
+ return drm_fixp2int(a + DRM_FIXED_ONE / 2);
Would this division be equivalent to just shifting 1ULL by 31 instead of
32 as done in DRM_FIXED_ONE?
Melissa
}
static inline int drm_fixp2int_ceil(s64 a)
--
2.43.0
