drm/amd/display: programming last delta in output transfer function LUT to a correct value (c11e57f0) · Commits · 戴 / test

[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@amd.com> Reviewed-by:

Tony Cheng <Tony.Cheng@amd.com> Acked-by:

Jun Lei <Jun.Lei@amd.com> Acked-by:

Rodrigo Siqueira <Rodrigo.Siqueira@amd.com> Acked-by:

Harry Wentland <harry.wentland@amd.com> Signed-off-by:

Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dcn10/dcn10_cm_common.c

+13 −0

Original line number	Diff line number	Diff line
		@@ -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;
		}

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