[PATCH v2 1/2] drm: Add fixed-point helper to get rounded integer values

[Maíra Canal]

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

Signed-off-by: Maíra Canal <mcanal at igalia.com>
---

v1 -> v2: https://lore.kernel.org/dri-devel/20230425153353.238844-1-mcanal@igalia.com/T/

* New patch
* Create the function drm_fixp2int_round() (Melissa Wen).

---
 include/drm/drm_fixed.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/include/drm/drm_fixed.h b/include/drm/drm_fixed.h
index 255645c1f9a8..d695d0411e2d 100644
--- a/include/drm/drm_fixed.h
+++ b/include/drm/drm_fixed.h
@@ -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 ((s64)a + (1 << (DRM_FIXED_POINT_HALF - 1))) >> DRM_FIXED_POINT;
+}
+
 static inline int drm_fixp2int_ceil(s64 a)
 {
 	if (a > 0)
-- 
2.40.1