[PATCH 14/34] drm/amd/display: Use hardware max low point when sampling OTF

[Harry Wentland <harry.wentland-5C7GfCeVMHo@public.gmane.org>]

From: "Leo (Sunpeng) Li" <sunpeng.li@amd.com>

The MAX_LOW_POINT macro should reflect the maximum low point within
hardware. Otherwise, sampling for the hardware points from the output
transfer function (OTF) will be incorrect.

Also, fix usage of MAX_LOW_POINT accordingly.

Change-Id: I6affb8e987ac786c2c9ac8fba4bee5384dc54d07
Signed-off-by: Leo (Sunpeng) Li <sunpeng.li@amd.com>
Reviewed-by: Krunoslav Kovac <Krunoslav.Kovac@amd.com>
Acked-by: Harry Wentland <harry.wentland@amd.com>
---
 drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c b/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c
index 9e97cd74b0ec..bc698644d42a 100644
--- a/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c
+++ b/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c
@@ -409,7 +409,7 @@ static bool convert_to_custom_float(struct pwl_result_data *rgb_resulted,
 	return true;
 }
 
-#define MAX_LOW_POINT      11
+#define MAX_LOW_POINT      25
 #define NUMBER_REGIONS     16
 #define NUMBER_SW_SEGMENTS 16
 
@@ -443,8 +443,8 @@ dce110_translate_regamma_to_hw_format(const struct dc_transfer_func *output_tf,
 		/* 16 segments
 		 * segments are from 2^-11 to 2^5
 		 */
-		region_start = -MAX_LOW_POINT;
-		region_end = NUMBER_REGIONS - MAX_LOW_POINT;
+		region_start = -11;
+		region_end = region_start + NUMBER_REGIONS;
 
 		for (i = 0; i < NUMBER_REGIONS; i++)
 			seg_distr[i] = 4;
-- 
2.14.1

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