drm/amd/display: Remove byte swapping for dmcub abm config table

[Why]
Since x86 and dmcub are both little endian, byte swapping isn't
necessary. Dmcu requires byte swapping as it is big endian.

[How]
Add flag to function definitions to determine if byte swapping is
necessary.
Signed-off-by: Wyatt Wood <wyatt.wood@amd.com>
Reviewed-by: Anthony Koo <Anthony.Koo@amd.com>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -240,7 +240,7 @@ static void fill_backlight_transform_table(struct dmcu_iram_parameters params,
 }
 
 static void fill_backlight_transform_table_v_2_2(struct dmcu_iram_parameters params,
-		struct iram_table_v_2_2 *table)
+		struct iram_table_v_2_2 *table, bool big_endian)
 {
 	unsigned int i;
 	unsigned int num_entries = NUM_BL_CURVE_SEGS;
@@ -264,10 +264,10 @@ static void fill_backlight_transform_table_v_2_2(struct dmcu_iram_parameters par
 		lut_index = (params.backlight_lut_array_size - 1) * i / (num_entries - 1);
 		ASSERT(lut_index < params.backlight_lut_array_size);
 
-		table->backlight_thresholds[i] =
-			cpu_to_be16(DIV_ROUNDUP((i * 65536), num_entries));
-		table->backlight_offsets[i] =
-			cpu_to_be16(params.backlight_lut_array[lut_index]);
+		table->backlight_thresholds[i] = (big_endian) ?
+			cpu_to_be16(DIV_ROUNDUP((i * 65536), num_entries)) : DIV_ROUNDUP((i * 65536), num_entries);
+		table->backlight_offsets[i] = (big_endian) ?
+			cpu_to_be16(params.backlight_lut_array[lut_index]) : params.backlight_lut_array[lut_index];
 	}
 }
 
@@ -587,18 +587,16 @@ void fill_iram_v_2_2(struct iram_table_v_2_2 *ram_table, struct dmcu_iram_parame
 	ram_table->crgb_slope[7]  = cpu_to_be16(0x1910);
 
 	fill_backlight_transform_table_v_2_2(
-			params, ram_table);
+			params, ram_table, true);
 }
 
-void fill_iram_v_2_3(struct iram_table_v_2_2 *ram_table, struct dmcu_iram_parameters params)
+void fill_iram_v_2_3(struct iram_table_v_2_2 *ram_table, struct dmcu_iram_parameters params, bool big_endian)
 {
 	unsigned int i, j;
 	unsigned int set = params.set;
 
 	ram_table->flags = 0x0;
-
-	ram_table->min_abm_backlight =
-			cpu_to_be16(params.min_abm_backlight);
+	ram_table->min_abm_backlight = (big_endian) ? cpu_to_be16(params.min_abm_backlight) : params.min_abm_backlight;
 
 	for (i = 0; i < NUM_AGGR_LEVEL; i++) {
 		ram_table->hybrid_factor[i] = abm_settings[set][i].brightness_gain;
@@ -622,33 +620,33 @@ void fill_iram_v_2_3(struct iram_table_v_2_2 *ram_table, struct dmcu_iram_parame
 	ram_table->iir_curve[4] = 0x65;
 
 	//Gamma 2.2
-	ram_table->crgb_thresh[0] = cpu_to_be16(0x127c);
-	ram_table->crgb_thresh[1] = cpu_to_be16(0x151b);
-	ram_table->crgb_thresh[2] = cpu_to_be16(0x17d5);
-	ram_table->crgb_thresh[3] = cpu_to_be16(0x1a56);
-	ram_table->crgb_thresh[4] = cpu_to_be16(0x1c83);
-	ram_table->crgb_thresh[5] = cpu_to_be16(0x1e72);
-	ram_table->crgb_thresh[6] = cpu_to_be16(0x20f0);
-	ram_table->crgb_thresh[7] = cpu_to_be16(0x232b);
-	ram_table->crgb_offset[0] = cpu_to_be16(0x2999);
-	ram_table->crgb_offset[1] = cpu_to_be16(0x3999);
-	ram_table->crgb_offset[2] = cpu_to_be16(0x4666);
-	ram_table->crgb_offset[3] = cpu_to_be16(0x5999);
-	ram_table->crgb_offset[4] = cpu_to_be16(0x6333);
-	ram_table->crgb_offset[5] = cpu_to_be16(0x7800);
-	ram_table->crgb_offset[6] = cpu_to_be16(0x8c00);
-	ram_table->crgb_offset[7] = cpu_to_be16(0xa000);
-	ram_table->crgb_slope[0]  = cpu_to_be16(0x3609);
-	ram_table->crgb_slope[1]  = cpu_to_be16(0x2dfa);
-	ram_table->crgb_slope[2]  = cpu_to_be16(0x27ea);
-	ram_table->crgb_slope[3]  = cpu_to_be16(0x235d);
-	ram_table->crgb_slope[4]  = cpu_to_be16(0x2042);
-	ram_table->crgb_slope[5]  = cpu_to_be16(0x1dc3);
-	ram_table->crgb_slope[6]  = cpu_to_be16(0x1b1a);
-	ram_table->crgb_slope[7]  = cpu_to_be16(0x1910);
+	ram_table->crgb_thresh[0] = (big_endian) ? cpu_to_be16(0x127c) : 0x127c;
+	ram_table->crgb_thresh[1] = (big_endian) ? cpu_to_be16(0x151b) : 0x151b;
+	ram_table->crgb_thresh[2] = (big_endian) ? cpu_to_be16(0x17d5) : 0x17d5;
+	ram_table->crgb_thresh[3] = (big_endian) ? cpu_to_be16(0x1a56) : 0x1a56;
+	ram_table->crgb_thresh[4] = (big_endian) ? cpu_to_be16(0x1c83) : 0x1c83;
+	ram_table->crgb_thresh[5] = (big_endian) ? cpu_to_be16(0x1e72) : 0x1e72;
+	ram_table->crgb_thresh[6] = (big_endian) ? cpu_to_be16(0x20f0) : 0x20f0;
+	ram_table->crgb_thresh[7] = (big_endian) ? cpu_to_be16(0x232b) : 0x232b;
+	ram_table->crgb_offset[0] = (big_endian) ? cpu_to_be16(0x2999) : 0x2999;
+	ram_table->crgb_offset[1] = (big_endian) ? cpu_to_be16(0x3999) : 0x3999;
+	ram_table->crgb_offset[2] = (big_endian) ? cpu_to_be16(0x4666) : 0x4666;
+	ram_table->crgb_offset[3] = (big_endian) ? cpu_to_be16(0x5999) : 0x5999;
+	ram_table->crgb_offset[4] = (big_endian) ? cpu_to_be16(0x6333) : 0x6333;
+	ram_table->crgb_offset[5] = (big_endian) ? cpu_to_be16(0x7800) : 0x7800;
+	ram_table->crgb_offset[6] = (big_endian) ? cpu_to_be16(0x8c00) : 0x8c00;
+	ram_table->crgb_offset[7] = (big_endian) ? cpu_to_be16(0xa000) : 0xa000;
+	ram_table->crgb_slope[0]  = (big_endian) ? cpu_to_be16(0x3609) : 0x3609;
+	ram_table->crgb_slope[1]  = (big_endian) ? cpu_to_be16(0x2dfa) : 0x2dfa;
+	ram_table->crgb_slope[2]  = (big_endian) ? cpu_to_be16(0x27ea) : 0x27ea;
+	ram_table->crgb_slope[3]  = (big_endian) ? cpu_to_be16(0x235d) : 0x235d;
+	ram_table->crgb_slope[4]  = (big_endian) ? cpu_to_be16(0x2042) : 0x2042;
+	ram_table->crgb_slope[5]  = (big_endian) ? cpu_to_be16(0x1dc3) : 0x1dc3;
+	ram_table->crgb_slope[6]  = (big_endian) ? cpu_to_be16(0x1b1a) : 0x1b1a;
+	ram_table->crgb_slope[7]  = (big_endian) ? cpu_to_be16(0x1910) : 0x1910;
 
 	fill_backlight_transform_table_v_2_2(
-			params, ram_table);
+			params, ram_table, big_endian);
 }
 
 bool dmub_init_abm_config(struct abm *abm,
@@ -662,7 +660,7 @@ bool dmub_init_abm_config(struct abm *abm,
 
 	memset(&ram_table, 0, sizeof(ram_table));
 
-	fill_iram_v_2_3((struct iram_table_v_2_2 *)ram_table, params);
+	fill_iram_v_2_3((struct iram_table_v_2_2 *)ram_table, params, false);
 	result = abm->funcs->init_abm_config(
 		abm, (char *)(&ram_table), IRAM_RESERVE_AREA_START_V2_2);
 
@@ -684,11 +682,11 @@ bool dmcu_load_iram(struct dmcu *dmcu,
 	memset(&ram_table, 0, sizeof(ram_table));
 
 	if (dmcu->dmcu_version.abm_version == 0x24) {
-		fill_iram_v_2_3((struct iram_table_v_2_2 *)ram_table, params);
+		fill_iram_v_2_3((struct iram_table_v_2_2 *)ram_table, params, true);
 			result = dmcu->funcs->load_iram(
 					dmcu, 0, (char *)(&ram_table), IRAM_RESERVE_AREA_START_V2_2);
 	} else if (dmcu->dmcu_version.abm_version == 0x23) {
-		fill_iram_v_2_3((struct iram_table_v_2_2 *)ram_table, params);
+		fill_iram_v_2_3((struct iram_table_v_2_2 *)ram_table, params, true);
 
 		result = dmcu->funcs->load_iram(
 				dmcu, 0, (char *)(&ram_table), IRAM_RESERVE_AREA_START_V2_2);