drm/amd/display: Add bit swap helper based on endianness

Christian Koenig pointed out a code duplication related to bit swap in
case of big-endian manipulation. This commit adds a helper for handling
this verification and reduces the requirement of replicate some part of
the code.
Signed-off-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Reviewed-by: Wyatt Wood <Wyatt.Wood@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

@@ -29,6 +29,8 @@
 #include "core_types.h"
 
 #define DIV_ROUNDUP(a, b) (((a)+((b)/2))/(b))
+#define bswap16_based_on_endian(big_endian, value) \
+	(big_endian) ? cpu_to_be16(value) : cpu_to_le16(value)
 
 /* Possible Min Reduction config from least aggressive to most aggressive
  *  0    1     2     3     4     5     6     7     8     9     10    11   12
@@ -624,30 +626,30 @@ 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] = (big_endian) ? cpu_to_be16(0x127c) : cpu_to_le16(0x127c);
-	ram_table->crgb_thresh[1] = (big_endian) ? cpu_to_be16(0x151b) : cpu_to_le16(0x151b);
-	ram_table->crgb_thresh[2] = (big_endian) ? cpu_to_be16(0x17d5) : cpu_to_le16(0x17d5);
-	ram_table->crgb_thresh[3] = (big_endian) ? cpu_to_be16(0x1a56) : cpu_to_le16(0x1a56);
-	ram_table->crgb_thresh[4] = (big_endian) ? cpu_to_be16(0x1c83) : cpu_to_le16(0x1c83);
-	ram_table->crgb_thresh[5] = (big_endian) ? cpu_to_be16(0x1e72) : cpu_to_le16(0x1e72);
-	ram_table->crgb_thresh[6] = (big_endian) ? cpu_to_be16(0x20f0) : cpu_to_le16(0x20f0);
-	ram_table->crgb_thresh[7] = (big_endian) ? cpu_to_be16(0x232b) : cpu_to_le16(0x232b);
-	ram_table->crgb_offset[0] = (big_endian) ? cpu_to_be16(0x2999) : cpu_to_le16(0x2999);
-	ram_table->crgb_offset[1] = (big_endian) ? cpu_to_be16(0x3999) : cpu_to_le16(0x3999);
-	ram_table->crgb_offset[2] = (big_endian) ? cpu_to_be16(0x4666) : cpu_to_le16(0x4666);
-	ram_table->crgb_offset[3] = (big_endian) ? cpu_to_be16(0x5999) : cpu_to_le16(0x5999);
-	ram_table->crgb_offset[4] = (big_endian) ? cpu_to_be16(0x6333) : cpu_to_le16(0x6333);
-	ram_table->crgb_offset[5] = (big_endian) ? cpu_to_be16(0x7800) : cpu_to_le16(0x7800);
-	ram_table->crgb_offset[6] = (big_endian) ? cpu_to_be16(0x8c00) : cpu_to_le16(0x8c00);
-	ram_table->crgb_offset[7] = (big_endian) ? cpu_to_be16(0xa000) : cpu_to_le16(0xa000);
-	ram_table->crgb_slope[0]  = (big_endian) ? cpu_to_be16(0x3609) : cpu_to_le16(0x3609);
-	ram_table->crgb_slope[1]  = (big_endian) ? cpu_to_be16(0x2dfa) : cpu_to_le16(0x2dfa);
-	ram_table->crgb_slope[2]  = (big_endian) ? cpu_to_be16(0x27ea) : cpu_to_le16(0x27ea);
-	ram_table->crgb_slope[3]  = (big_endian) ? cpu_to_be16(0x235d) : cpu_to_le16(0x235d);
-	ram_table->crgb_slope[4]  = (big_endian) ? cpu_to_be16(0x2042) : cpu_to_le16(0x2042);
-	ram_table->crgb_slope[5]  = (big_endian) ? cpu_to_be16(0x1dc3) : cpu_to_le16(0x1dc3);
-	ram_table->crgb_slope[6]  = (big_endian) ? cpu_to_be16(0x1b1a) : cpu_to_le16(0x1b1a);
-	ram_table->crgb_slope[7]  = (big_endian) ? cpu_to_be16(0x1910) : cpu_to_le16(0x1910);
+	ram_table->crgb_thresh[0] = bswap16_based_on_endian(big_endian, 0x127c);
+	ram_table->crgb_thresh[1] = bswap16_based_on_endian(big_endian, 0x151b);
+	ram_table->crgb_thresh[2] = bswap16_based_on_endian(big_endian, 0x17d5);
+	ram_table->crgb_thresh[3] = bswap16_based_on_endian(big_endian, 0x1a56);
+	ram_table->crgb_thresh[4] = bswap16_based_on_endian(big_endian, 0x1c83);
+	ram_table->crgb_thresh[5] = bswap16_based_on_endian(big_endian, 0x1e72);
+	ram_table->crgb_thresh[6] = bswap16_based_on_endian(big_endian, 0x20f0);
+	ram_table->crgb_thresh[7] = bswap16_based_on_endian(big_endian, 0x232b);
+	ram_table->crgb_offset[0] = bswap16_based_on_endian(big_endian, 0x2999);
+	ram_table->crgb_offset[1] = bswap16_based_on_endian(big_endian, 0x3999);
+	ram_table->crgb_offset[2] = bswap16_based_on_endian(big_endian, 0x4666);
+	ram_table->crgb_offset[3] = bswap16_based_on_endian(big_endian, 0x5999);
+	ram_table->crgb_offset[4] = bswap16_based_on_endian(big_endian, 0x6333);
+	ram_table->crgb_offset[5] = bswap16_based_on_endian(big_endian, 0x7800);
+	ram_table->crgb_offset[6] = bswap16_based_on_endian(big_endian, 0x8c00);
+	ram_table->crgb_offset[7] = bswap16_based_on_endian(big_endian, 0xa000);
+	ram_table->crgb_slope[0]  = bswap16_based_on_endian(big_endian, 0x3609);
+	ram_table->crgb_slope[1]  = bswap16_based_on_endian(big_endian, 0x2dfa);
+	ram_table->crgb_slope[2]  = bswap16_based_on_endian(big_endian, 0x27ea);
+	ram_table->crgb_slope[3]  = bswap16_based_on_endian(big_endian, 0x235d);
+	ram_table->crgb_slope[4]  = bswap16_based_on_endian(big_endian, 0x2042);
+	ram_table->crgb_slope[5]  = bswap16_based_on_endian(big_endian, 0x1dc3);
+	ram_table->crgb_slope[6]  = bswap16_based_on_endian(big_endian, 0x1b1a);
+	ram_table->crgb_slope[7]  = bswap16_based_on_endian(big_endian, 0x1910);
 
 	fill_backlight_transform_table_v_2_2(
 			params, ram_table, big_endian);