From: Chaitanya Kumar Borah <chaitanya.kumar.bo...@intel.com>
Add helper to extract lut values in 32-bit precision needed by
hardware.
Signed-off-by: Alex Hung <alex.h...@amd.com>
Signed-off-by: Uma Shankar <uma.shan...@intel.com>
Signed-off-by: Chaitanya Kumar Borah <chaitanya.kumar.bo...@intel.com>
---
v11:
- Include help function drm_color_lut32_extract (Uma Shankar)
include/drm/drm_color_mgmt.h | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff --git a/include/drm/drm_color_mgmt.h b/include/drm/drm_color_mgmt.h
index c422f352a150..90210bd2f5bd 100644
--- a/include/drm/drm_color_mgmt.h
+++ b/include/drm/drm_color_mgmt.h
@@ -50,6 +50,22 @@ static inline u32 drm_color_lut_extract(u32 user_input, int
bit_precision)
(1 << 16) - 1);
}
+/**
+ * drm_color_lut32_extract - clamp and round LUT entries
+ * @user_input: input value
+ * @bit_precision: number of bits the hw LUT supports
+ *
+ * Extract U0.bit_precision from a U0.32 LUT value.
+ *
+ */
+static inline u32 drm_color_lut32_extract(u32 user_input, int bit_precision)
+{
+ u64 max = (bit_precision >= 64) ? ~0ULL : (1ULL << bit_precision) - 1;
+
+ return DIV_ROUND_CLOSEST_ULL((u64)user_input * max,
+ (1ULL << 32) - 1);
+}
+
u64 drm_color_ctm_s31_32_to_qm_n(u64 user_input, u32 m, u32 n);
void drm_crtc_enable_color_mgmt(struct drm_crtc *crtc,
--
2.43.0
