drm/amd/display: Convert memory from cpu to fw endianness correctly

[Why]
Current code does not guarantee the correct endianness of memory being
copied to fw, specifically in the case where cpu isn't little endian.

[How]
Windows and Diags are always little endian, so we define a macro that
does nothing. Linux already defines this macro and will do the correct
endianness conversion.
Signed-off-by: Wyatt Wood <wyatt.wood@amd.com>
Reviewed-by: Harry Wentland <Harry.Wentland@amd.com>
Acked-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

@@ -265,9 +265,11 @@ static void fill_backlight_transform_table_v_2_2(struct dmcu_iram_parameters par
 		ASSERT(lut_index < params.backlight_lut_array_size);
 
 		table->backlight_thresholds[i] = (big_endian) ?
-			cpu_to_be16(DIV_ROUNDUP((i * 65536), num_entries)) : DIV_ROUNDUP((i * 65536), num_entries);
+			cpu_to_be16(DIV_ROUNDUP((i * 65536), num_entries)) :
+			cpu_to_le16(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];
+			cpu_to_be16(params.backlight_lut_array[lut_index]) :
+			cpu_to_le16(params.backlight_lut_array[lut_index]);
 	}
 }
 
@@ -596,7 +598,9 @@ void fill_iram_v_2_3(struct iram_table_v_2_2 *ram_table, struct dmcu_iram_parame
 	unsigned int set = params.set;
 
 	ram_table->flags = 0x0;
-	ram_table->min_abm_backlight = (big_endian) ? cpu_to_be16(params.min_abm_backlight) : params.min_abm_backlight;
+	ram_table->min_abm_backlight = (big_endian) ?
+		cpu_to_be16(params.min_abm_backlight) :
+		cpu_to_le16(params.min_abm_backlight);
 
 	for (i = 0; i < NUM_AGGR_LEVEL; i++) {
 		ram_table->hybrid_factor[i] = abm_settings[set][i].brightness_gain;
@@ -620,30 +624,30 @@ 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) : 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;
+	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);
 
 	fill_backlight_transform_table_v_2_2(
 			params, ram_table, big_endian);