drm/amd/display: Fix ABM memory alignment issue

[Why]
Due to packing of abm_config_table, memory addresses aren't aligned to
32 bit boundary dmcub prefers.  Therefore when using pointers to this
structure, it's possible that dmcub will automatically align the data
read from that address, yielding incorrect values.

[How]
Instead of packing 1 byte boundary, explicitly pack values to 4 byte
boundary. Since there is a dependency on the existing iram table
structure on driver side, we must copy to a second structure, which is
aligned correctly, before passing to fw.
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

@@ -27,6 +27,7 @@
 #include "dc/inc/hw/abm.h"
 #include "dc.h"
 #include "core_types.h"
+#include "dmub_cmd_dal.h"
 
 #define DIV_ROUNDUP(a, b) (((a)+((b)/2))/(b))
 #define bswap16_based_on_endian(big_endian, value) \
@@ -658,17 +659,55 @@ void fill_iram_v_2_3(struct iram_table_v_2_2 *ram_table, struct dmcu_iram_parame
 bool dmub_init_abm_config(struct abm *abm,
 	struct dmcu_iram_parameters params)
 {
-	unsigned char ram_table[IRAM_SIZE];
+	struct iram_table_v_2_2 ram_table;
+	struct abm_config_table config;
 	bool result = false;
+	uint32_t i, j = 0;
 
 	if (abm == NULL)
 		return false;
 
 	memset(&ram_table, 0, sizeof(ram_table));
+	memset(&config, 0, sizeof(config));
+
+	fill_iram_v_2_3(&ram_table, params, false);
+
+	// We must copy to structure that is aligned to 32-bit
+	for (i = 0; i < NUM_POWER_FN_SEGS; i++) {
+		config.crgb_thresh[i] = ram_table.crgb_thresh[i];
+		config.crgb_offset[i] = ram_table.crgb_offset[i];
+		config.crgb_slope[i] = ram_table.crgb_slope[i];
+	}
+
+	for (i = 0; i < NUM_BL_CURVE_SEGS; i++) {
+		config.backlight_thresholds[i] = ram_table.backlight_thresholds[i];
+		config.backlight_offsets[i] = ram_table.backlight_offsets[i];
+	}
+
+	for (i = 0; i < NUM_AMBI_LEVEL; i++)
+		config.iir_curve[i] = ram_table.iir_curve[i];
+
+	for (i = 0; i < NUM_AMBI_LEVEL; i++) {
+		for (j = 0; j < NUM_AGGR_LEVEL; j++) {
+			config.min_reduction[i][j] = ram_table.min_reduction[i][j];
+			config.max_reduction[i][j] = ram_table.max_reduction[i][j];
+			config.bright_pos_gain[i][j] = ram_table.bright_pos_gain[i][j];
+			config.dark_pos_gain[i][j] = ram_table.dark_pos_gain[i][j];
+		}
+	}
+
+	for (i = 0; i < NUM_AGGR_LEVEL; i++) {
+		config.hybrid_factor[i] = ram_table.hybrid_factor[i];
+		config.contrast_factor[i] = ram_table.contrast_factor[i];
+		config.deviation_gain[i] = ram_table.deviation_gain[i];
+		config.min_knee[i] = ram_table.min_knee[i];
+		config.max_knee[i] = ram_table.max_knee[i];
+	}
+
+	config.min_abm_backlight = ram_table.min_abm_backlight;
 
-	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);
+		abm, (char *)(&config), sizeof(struct abm_config_table));
 
 	return result;
 }