drm/amd/display: add option to use custom backlight caps

[Why & How]
Provide option for vendors to specify a custom brightness-to-backlight
conversion profile.
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Reviewed-by: Anthony Koo <Anthony.Koo@amd.com>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Josip Pavic <Josip.Pavic@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/modules/power/power_helpers.c

@@ -116,6 +116,27 @@ static const struct abm_parameters * const abm_settings[] = {
 	abm_settings_config2,
 };
 
+const struct dm_bl_data_point custom_backlight_curve0[] = {
+		{2, 14}, {4, 16}, {6, 18}, {8, 21}, {10, 23}, {12, 26}, {14, 29}, {16, 32}, {18, 35},
+		{20, 38}, {22, 41}, {24, 44}, {26, 48}, {28, 52}, {30, 55}, {32, 59}, {34, 62},
+		{36, 67}, {38, 71}, {40, 75}, {42, 80}, {44, 84}, {46, 88}, {48, 93}, {50, 98},
+		{52, 103}, {54, 108}, {56, 113}, {58, 118}, {60, 123}, {62, 129}, {64, 135}, {66, 140},
+		{68, 146}, {70, 152}, {72, 158}, {74, 164}, {76, 171}, {78, 177}, {80, 183}, {82, 190},
+		{84, 197}, {86, 204}, {88, 211}, {90, 218}, {92, 225}, {94, 232}, {96, 240}, {98, 247}};
+
+struct custom_backlight_profile {
+	uint8_t  ac_level_percentage;
+	uint8_t  dc_level_percentage;
+	uint8_t  min_input_signal;
+	uint8_t  max_input_signal;
+	uint8_t  num_data_points;
+	const struct dm_bl_data_point *data_points;
+};
+
+static const struct custom_backlight_profile custom_backlight_profiles[] = {
+		{100, 32, 12, 255, ARRAY_SIZE(custom_backlight_curve0), custom_backlight_curve0},
+};
+
 #define NUM_AMBI_LEVEL    5
 #define NUM_AGGR_LEVEL    4
 #define NUM_POWER_FN_SEGS 8
@@ -944,3 +965,25 @@ bool psr_su_set_dsc_slice_height(struct dc *dc, struct dc_link *link,
 
 	return true;
 }
+
+bool fill_custom_backlight_caps(unsigned int config_no, struct dm_acpi_atif_backlight_caps *caps)
+{
+	unsigned int data_points_size;
+
+	if (config_no >= ARRAY_SIZE(custom_backlight_profiles))
+		return false;
+
+	data_points_size = custom_backlight_profiles[config_no].num_data_points
+			* sizeof(custom_backlight_profiles[config_no].data_points[0]);
+
+	caps->size = sizeof(struct dm_acpi_atif_backlight_caps) - sizeof(caps->data_points) + data_points_size;
+	caps->flags = 0;
+	caps->error_code = 0;
+	caps->ac_level_percentage = custom_backlight_profiles[config_no].ac_level_percentage;
+	caps->dc_level_percentage = custom_backlight_profiles[config_no].dc_level_percentage;
+	caps->min_input_signal = custom_backlight_profiles[config_no].min_input_signal;
+	caps->max_input_signal = custom_backlight_profiles[config_no].max_input_signal;
+	caps->num_data_points = custom_backlight_profiles[config_no].num_data_points;
+	memcpy(caps->data_points, custom_backlight_profiles[config_no].data_points, data_points_size);
+	return true;
+}

drivers/gpu/drm/amd/display/modules/power/power_helpers.h

@@ -62,4 +62,7 @@ bool mod_power_only_edp(const struct dc_state *context,
 bool psr_su_set_dsc_slice_height(struct dc *dc, struct dc_link *link,
 			      struct dc_stream_state *stream,
 			      struct psr_config *config);
+
+bool fill_custom_backlight_caps(unsigned int config_no,
+		struct dm_acpi_atif_backlight_caps *caps);
 #endif /* MODULES_POWER_POWER_HELPERS_H_ */