drm/amd/display: Allow inverted gamma

[why]
There's a use case for inverted gamma
and it's been confirmed that negative slopes are ok.

[how]
Remove code for blocking non-monotonically increasing gamma

Signed-off-by: Aidan Yang <Aidan.Yang@amd.com>
Reviewed-by: Krunoslav Kovac <Krunoslav.Kovac@amd.com>
Acked-by: Leo Li <sunpeng.li@amd.com>
Acked-by: Reza Amini <Reza.Amini@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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 01c7e30..bbd6e01 100644 (file)
--- a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_cm_common.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_cm_common.c
@@ -393,6 +393,10 @@ bool cm_helper_translate_curve_to_hw_format(
        rgb_resulted[hw_points - 1].green = output_tf->tf_pts.green[start_index];
        rgb_resulted[hw_points - 1].blue = output_tf->tf_pts.blue[start_index];
 
+       rgb_resulted[hw_points].red = rgb_resulted[hw_points - 1].red;
+       rgb_resulted[hw_points].green = rgb_resulted[hw_points - 1].green;
+       rgb_resulted[hw_points].blue = rgb_resulted[hw_points - 1].blue;
+
        // All 3 color channels have same x
        corner_points[0].red.x = dc_fixpt_pow(dc_fixpt_from_int(2),
                                             dc_fixpt_from_int(region_start));
@@ -464,13 +468,6 @@ bool cm_helper_translate_curve_to_hw_format(
 
        i = 1;
        while (i != hw_points + 1) {
-               if (dc_fixpt_lt(rgb_plus_1->red, rgb->red))
-                       rgb_plus_1->red = rgb->red;
-               if (dc_fixpt_lt(rgb_plus_1->green, rgb->green))
-                       rgb_plus_1->green = rgb->green;
-               if (dc_fixpt_lt(rgb_plus_1->blue, rgb->blue))
-                       rgb_plus_1->blue = rgb->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);
@@ -562,6 +559,10 @@ bool cm_helper_translate_curve_to_degamma_hw_format(
        rgb_resulted[hw_points - 1].green = output_tf->tf_pts.green[start_index];
        rgb_resulted[hw_points - 1].blue = output_tf->tf_pts.blue[start_index];
 
+       rgb_resulted[hw_points].red = rgb_resulted[hw_points - 1].red;
+       rgb_resulted[hw_points].green = rgb_resulted[hw_points - 1].green;
+       rgb_resulted[hw_points].blue = rgb_resulted[hw_points - 1].blue;
+
        corner_points[0].red.x = dc_fixpt_pow(dc_fixpt_from_int(2),
                                             dc_fixpt_from_int(region_start));
        corner_points[0].green.x = corner_points[0].red.x;
@@ -624,13 +625,6 @@ bool cm_helper_translate_curve_to_degamma_hw_format(
 
        i = 1;
        while (i != hw_points + 1) {
-               if (dc_fixpt_lt(rgb_plus_1->red, rgb->red))
-                       rgb_plus_1->red = rgb->red;
-               if (dc_fixpt_lt(rgb_plus_1->green, rgb->green))
-                       rgb_plus_1->green = rgb->green;
-               if (dc_fixpt_lt(rgb_plus_1->blue, rgb->blue))
-                       rgb_plus_1->blue = rgb->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);