Re: [PATCH 1/7] drm: Fix drm_fixp2int_round() making it add 0.5

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On 2024-03-06 15:03, 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/

Suggested-by: Pekka Paalanen <pekka.paalanen@xxxxxxxxxxxxx>
Signed-off-by: Arthur Grillo <arthurgrillo@xxxxxxxxxx>

Reviewed-by: Harry Wentland <harry.wentland@xxxxxxx>

I had a different jab at this [1], but your patch is cleaner.

https://patchwork.freedesktop.org/patch/579978/?series=123446&rev=4

Harry

---
  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)));
+	return drm_fixp2int(a + DRM_FIXED_ONE / 2);
  }
static inline int drm_fixp2int_ceil(s64 a)




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