From: Vladimir Stempen <vladimir.stempen@xxxxxxx>
[Why]
Currently DAL programs negative slope for the last point of output
transfer function curve.
[How]
Applying a check for the last PWL point for RGB values not to be
smaller than previous. If smaller, initialize the last point values
to a sum of previous PWL value and previous PWL delta;
Signed-off-by: Vladimir Stempen <Vladimir.Stempen@xxxxxxx>
Reviewed-by: Tony Cheng <Tony.Cheng@xxxxxxx>
Acked-by: Jun Lei <Jun.Lei@xxxxxxx>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@xxxxxxx>
Acked-by: Harry Wentland <harry.wentland@xxxxxxx>
---
.../gpu/drm/amd/display/dc/dcn10/dcn10_cm_common.c | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_cm_common.c b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_cm_common.c
index bbd6e01b3eca..47a39eb9400b 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_cm_common.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_cm_common.c
@@ -316,6 +316,7 @@ bool cm_helper_translate_curve_to_hw_format(
struct pwl_result_data *rgb_resulted;
struct pwl_result_data *rgb;
struct pwl_result_data *rgb_plus_1;
+ struct pwl_result_data *rgb_minus_1;
int32_t region_start, region_end;
int32_t i;
@@ -465,9 +466,20 @@ bool cm_helper_translate_curve_to_hw_format(
rgb = rgb_resulted;
rgb_plus_1 = rgb_resulted + 1;
+ rgb_minus_1 = rgb;
i = 1;
while (i != hw_points + 1) {
+
+ if (i >= hw_points - 1) {
+ if (dc_fixpt_lt(rgb_plus_1->red, rgb->red))
+ rgb_plus_1->red = dc_fixpt_add(rgb->red, rgb_minus_1->delta_red);
+ if (dc_fixpt_lt(rgb_plus_1->green, rgb->green))
+ rgb_plus_1->green = dc_fixpt_add(rgb->green, rgb_minus_1->delta_green);
+ if (dc_fixpt_lt(rgb_plus_1->blue, rgb->blue))
+ rgb_plus_1->blue = dc_fixpt_add(rgb->blue, rgb_minus_1->delta_blue);
+ }
+
rgb->delta_red = dc_fixpt_sub(rgb_plus_1->red, rgb->red);
rgb->delta_green = dc_fixpt_sub(rgb_plus_1->green, rgb->green);
rgb->delta_blue = dc_fixpt_sub(rgb_plus_1->blue, rgb->blue);
@@ -482,6 +494,7 @@ bool cm_helper_translate_curve_to_hw_format(
}
++rgb_plus_1;
+ rgb_minus_1 = rgb;
++rgb;
++i;
}
--
2.25.0
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