drm/amd/display: Load DMCU IRAM

DMCU IRAM must be loaded by the driver before DMCU
can function.

Move the IRAM code out of the shadows and into a new file
modules/power/power_helpers.c

The IRAM table contains the backlight curve and ABM parameters

Add this new file to the Makefiles

Call dmcu_load_iram in late init of DM

Move struct dmcu_version from dc.h to dmcu.h to allow
dmcu to be included on its own
Signed-off-by: David Francis <David.Francis@amd.com>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/Makefile

@@ -32,11 +32,12 @@ subdir-ccflags-y += -I$(FULL_AMD_DISPLAY_PATH)/modules/inc
 subdir-ccflags-y += -I$(FULL_AMD_DISPLAY_PATH)/modules/freesync
 subdir-ccflags-y += -I$(FULL_AMD_DISPLAY_PATH)/modules/color
 subdir-ccflags-y += -I$(FULL_AMD_DISPLAY_PATH)/modules/info_packet
+subdir-ccflags-y += -I$(FULL_AMD_DISPLAY_PATH)/modules/power
 
 #TODO: remove when Timing Sync feature is complete
 subdir-ccflags-y += -DBUILD_FEATURE_TIMING_SYNC=0
 
-DAL_LIBS = amdgpu_dm dc	modules/freesync modules/color modules/info_packet
+DAL_LIBS = amdgpu_dm dc	modules/freesync modules/color modules/info_packet modules/power
 
 AMD_DAL = $(addsuffix /Makefile, $(addprefix $(FULL_AMD_DISPLAY_PATH)/,$(DAL_LIBS)))
 

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c

@@ -71,6 +71,7 @@
 #endif
 
 #include "modules/inc/mod_freesync.h"
+#include "modules/power/power_helpers.h"
 
 #define FIRMWARE_RAVEN_DMCU		"amdgpu/raven_dmcu.bin"
 MODULE_FIRMWARE(FIRMWARE_RAVEN_DMCU);
@@ -642,6 +643,26 @@ static int dm_late_init(void *handle)
 {
 	struct amdgpu_device *adev = (struct amdgpu_device *)handle;
 
+	struct dmcu_iram_parameters params;
+	unsigned int linear_lut[16];
+	int i;
+	struct dmcu *dmcu = adev->dm.dc->res_pool->dmcu;
+	bool ret;
+
+	for (i = 0; i < 16; i++)
+		linear_lut[i] = 0xFFFF * i / 15;
+
+	params.set = 0;
+	params.backlight_ramping_start = 0xCCCC;
+	params.backlight_ramping_reduction = 0xCCCCCCCC;
+	params.backlight_lut_array_size = 16;
+	params.backlight_lut_array = linear_lut;
+
+	ret = dmcu_load_iram(dmcu, params);
+
+	if (!ret)
+		return -EINVAL;
+
 	return detect_mst_link_for_all_connectors(adev->ddev);
 }
 

drivers/gpu/drm/amd/display/dc/dc.h

@@ -36,6 +36,7 @@
 
 #include "inc/hw_sequencer.h"
 #include "inc/compressor.h"
+#include "inc/hw/dmcu.h"
 #include "dml/display_mode_lib.h"
 
 #define DC_VER "3.2.06"
@@ -47,13 +48,6 @@
 /*******************************************************************************
  * Display Core Interfaces
  ******************************************************************************/
-struct dmcu_version {
-	unsigned int date;
-	unsigned int month;
-	unsigned int year;
-	unsigned int interface_version;
-};
-
 struct dc_versions {
 	const char *dc_ver;
 	struct dmcu_version dmcu_version;

drivers/gpu/drm/amd/display/dc/inc/hw/dmcu.h

@@ -32,6 +32,13 @@ enum dmcu_state {
 	DMCU_RUNNING = 1
 };
 
+struct dmcu_version {
+	unsigned int date;
+	unsigned int month;
+	unsigned int year;
+	unsigned int interface_version;
+};
+
 struct dmcu {
 	struct dc_context *ctx;
 	const struct dmcu_funcs *funcs;

drivers/gpu/drm/amd/display/modules/power/Makefile

+#
+# Copyright 2017 Advanced Micro Devices, Inc.
+#
+# Permission is hereby granted, free of charge, to any person obtaining a
+# copy of this software and associated documentation files (the "Software"),
+# to deal in the Software without restriction, including without limitation
+# the rights to use, copy, modify, merge, publish, distribute, sublicense,
+# and/or sell copies of the Software, and to permit persons to whom the
+# Software is furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+# THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+# OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+# ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+# OTHER DEALINGS IN THE SOFTWARE.
+#
+#
+# Makefile for the 'power' sub-module of DAL.
+#
+
+MOD_POWER = power_helpers.o
+
+AMD_DAL_MOD_POWER = $(addprefix $(AMDDALPATH)/modules/power/,$(MOD_POWER))
+#$(info ************  DAL POWER MODULE MAKEFILE ************)
+
+AMD_DISPLAY_FILES += $(AMD_DAL_MOD_POWER)
\ No newline at end of file

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

+/* Copyright 2018 Advanced Micro Devices, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Authors: AMD
+ *
+ */
+
+#include "power_helpers.h"
+#include "dc/inc/hw/dmcu.h"
+
+#define DIV_ROUNDUP(a, b) (((a)+((b)/2))/(b))
+
+/* Possible Min Reduction config from least aggressive to most aggressive
+ *  0    1     2     3     4     5     6     7     8     9     10    11   12
+ * 100  98.0 94.1  94.1  85.1  80.3  75.3  69.4  60.0  57.6  50.2  49.8  40.0 %
+ */
+static const unsigned char min_reduction_table[13] = {
+0xff, 0xfa, 0xf0, 0xf0, 0xd9, 0xcd, 0xc0, 0xb1, 0x99, 0x93, 0x80, 0x82, 0x66};
+
+/* Possible Max Reduction configs from least aggressive to most aggressive
+ *  0    1     2     3     4     5     6     7     8     9     10    11   12
+ * 96.1 89.8 85.1  80.3  69.4  64.7  64.7  50.2  39.6  30.2  30.2  30.2  19.6 %
+ */
+static const unsigned char max_reduction_table[13] = {
+0xf5, 0xe5, 0xd9, 0xcd, 0xb1, 0xa5, 0xa5, 0x80, 0x65, 0x4d, 0x4d, 0x4d, 0x32};
+
+/* Predefined ABM configuration sets. We may have different configuration sets
+ * in order to satisfy different power/quality requirements.
+ */
+static const unsigned char abm_config[abm_defines_max_config][abm_defines_max_level] = {
+/*  ABM Level 1,    ABM Level 2,    ABM Level 3,    ABM Level 4 */
+{       2,              5,              7,              8       },	/* Default - Medium aggressiveness */
+{       2,              5,              8,              11      },	/* Alt #1  - Increased aggressiveness */
+{       0,              2,              4,              8       },	/* Alt #2  - Minimal aggressiveness */
+{       3,              6,              10,             12      },	/* Alt #3  - Super aggressiveness */
+};
+
+#define NUM_AMBI_LEVEL    5
+#define NUM_AGGR_LEVEL    4
+#define NUM_POWER_FN_SEGS 8
+#define NUM_BL_CURVE_SEGS 16
+
+/* NOTE: iRAM is 256B in size */
+struct iram_table_v_2 {
+	/* flags                      */
+	uint16_t flags;							/* 0x00 U16  */
+
+	/* parameters for ABM2.0 algorithm */
+	uint8_t min_reduction[NUM_AMBI_LEVEL][NUM_AGGR_LEVEL];		/* 0x02 U0.8 */
+	uint8_t max_reduction[NUM_AMBI_LEVEL][NUM_AGGR_LEVEL];		/* 0x16 U0.8 */
+	uint8_t bright_pos_gain[NUM_AMBI_LEVEL][NUM_AGGR_LEVEL];	/* 0x2a U2.6 */
+	uint8_t bright_neg_gain[NUM_AMBI_LEVEL][NUM_AGGR_LEVEL];	/* 0x3e U2.6 */
+	uint8_t dark_pos_gain[NUM_AMBI_LEVEL][NUM_AGGR_LEVEL];		/* 0x52 U2.6 */
+	uint8_t dark_neg_gain[NUM_AMBI_LEVEL][NUM_AGGR_LEVEL];		/* 0x66 U2.6 */
+	uint8_t iir_curve[NUM_AMBI_LEVEL];				/* 0x7a U0.8 */
+	uint8_t deviation_gain;						/* 0x7f U0.8 */
+
+	/* parameters for crgb conversion */
+	uint16_t crgb_thresh[NUM_POWER_FN_SEGS];			/* 0x80 U3.13 */
+	uint16_t crgb_offset[NUM_POWER_FN_SEGS];			/* 0x90 U1.15 */
+	uint16_t crgb_slope[NUM_POWER_FN_SEGS];				/* 0xa0 U4.12 */
+
+	/* parameters for custom curve */
+	/* thresholds for brightness --> backlight */
+	uint16_t backlight_thresholds[NUM_BL_CURVE_SEGS];		/* 0xb0 U16.0 */
+	/* offsets for brightness --> backlight */
+	uint16_t backlight_offsets[NUM_BL_CURVE_SEGS];			/* 0xd0 U16.0 */
+
+	/* For reading PSR State directly from IRAM */
+	uint8_t psr_state;						/* 0xf0       */
+	uint8_t dmcu_interface_version;					/* 0xf1       */
+	uint8_t dmcu_date_version_year_b0;				/* 0xf2       */
+	uint8_t dmcu_date_version_year_b1;				/* 0xf3       */
+	uint8_t dmcu_date_version_month;				/* 0xf4       */
+	uint8_t dmcu_date_version_day;					/* 0xf5       */
+	uint8_t dmcu_state;						/* 0xf6       */
+
+	uint16_t blRampReduction;					/* 0xf7       */
+	uint16_t blRampStart;						/* 0xf9       */
+	uint8_t dummy5;							/* 0xfb       */
+	uint8_t dummy6;							/* 0xfc       */
+	uint8_t dummy7;							/* 0xfd       */
+	uint8_t dummy8;							/* 0xfe       */
+	uint8_t dummy9;							/* 0xff       */
+};
+
+static uint16_t backlight_8_to_16(unsigned int backlight_8bit)
+{
+	return (uint16_t)(backlight_8bit * 0x101);
+}
+
+static void fill_backlight_transform_table(struct dmcu_iram_parameters params,
+		struct iram_table_v_2 *table)
+{
+	unsigned int i;
+	unsigned int num_entries = NUM_BL_CURVE_SEGS;
+	unsigned int query_input_8bit;
+	unsigned int query_output_8bit;
+	unsigned int lut_index;
+
+	table->backlight_thresholds[0] = 0;
+	table->backlight_offsets[0] = params.backlight_lut_array[0];
+	table->backlight_thresholds[num_entries-1] = 0xFFFF;
+	table->backlight_offsets[num_entries-1] =
+		params.backlight_lut_array[params.backlight_lut_array_size - 1];
+
+	/* Setup all brightness levels between 0% and 100% exclusive
+	 * Fills brightness-to-backlight transform table. Backlight custom curve
+	 * describes transform from brightness to backlight. It will be defined
+	 * as set of thresholds and set of offsets, together, implying
+	 * extrapolation of custom curve into 16 uniformly spanned linear
+	 * segments.  Each threshold/offset represented by 16 bit entry in
+	 * format U4.10.
+	 */
+	for (i = 1; i+1 < num_entries; i++) {
+		query_input_8bit = DIV_ROUNDUP((i * 256), num_entries);
+
+		lut_index = (params.backlight_lut_array_size - 1) * i / (num_entries - 1);
+		ASSERT(lut_index < params.backlight_lut_array_size);
+		query_output_8bit = params.backlight_lut_array[lut_index] >> 8;
+
+		table->backlight_thresholds[i] =
+				backlight_8_to_16(query_input_8bit);
+		table->backlight_offsets[i] =
+				backlight_8_to_16(query_output_8bit);
+	}
+}
+
+bool dmcu_load_iram(struct dmcu *dmcu,
+	struct dmcu_iram_parameters params)
+{
+	struct iram_table_v_2 ram_table;
+	unsigned int set = params.set;
+
+	if (dmcu == NULL)
+		return false;
+
+	if (!dmcu->funcs->is_dmcu_initialized(dmcu))
+		return true;
+
+	memset(&ram_table, 0, sizeof(ram_table));
+
+	ram_table.flags = 0x0;
+	ram_table.deviation_gain = 0xb3;
+
+	ram_table.blRampReduction =
+		cpu_to_be16(params.backlight_ramping_reduction);
+	ram_table.blRampStart =
+		cpu_to_be16(params.backlight_ramping_start);
+
+	ram_table.min_reduction[0][0] = min_reduction_table[abm_config[set][0]];
+	ram_table.min_reduction[1][0] = min_reduction_table[abm_config[set][0]];
+	ram_table.min_reduction[2][0] = min_reduction_table[abm_config[set][0]];
+	ram_table.min_reduction[3][0] = min_reduction_table[abm_config[set][0]];
+	ram_table.min_reduction[4][0] = min_reduction_table[abm_config[set][0]];
+	ram_table.max_reduction[0][0] = max_reduction_table[abm_config[set][0]];
+	ram_table.max_reduction[1][0] = max_reduction_table[abm_config[set][0]];
+	ram_table.max_reduction[2][0] = max_reduction_table[abm_config[set][0]];
+	ram_table.max_reduction[3][0] = max_reduction_table[abm_config[set][0]];
+	ram_table.max_reduction[4][0] = max_reduction_table[abm_config[set][0]];
+
+	ram_table.min_reduction[0][1] = min_reduction_table[abm_config[set][1]];
+	ram_table.min_reduction[1][1] = min_reduction_table[abm_config[set][1]];
+	ram_table.min_reduction[2][1] = min_reduction_table[abm_config[set][1]];
+	ram_table.min_reduction[3][1] = min_reduction_table[abm_config[set][1]];
+	ram_table.min_reduction[4][1] = min_reduction_table[abm_config[set][1]];
+	ram_table.max_reduction[0][1] = max_reduction_table[abm_config[set][1]];
+	ram_table.max_reduction[1][1] = max_reduction_table[abm_config[set][1]];
+	ram_table.max_reduction[2][1] = max_reduction_table[abm_config[set][1]];
+	ram_table.max_reduction[3][1] = max_reduction_table[abm_config[set][1]];
+	ram_table.max_reduction[4][1] = max_reduction_table[abm_config[set][1]];
+
+	ram_table.min_reduction[0][2] = min_reduction_table[abm_config[set][2]];
+	ram_table.min_reduction[1][2] = min_reduction_table[abm_config[set][2]];
+	ram_table.min_reduction[2][2] = min_reduction_table[abm_config[set][2]];
+	ram_table.min_reduction[3][2] = min_reduction_table[abm_config[set][2]];
+	ram_table.min_reduction[4][2] = min_reduction_table[abm_config[set][2]];
+	ram_table.max_reduction[0][2] = max_reduction_table[abm_config[set][2]];
+	ram_table.max_reduction[1][2] = max_reduction_table[abm_config[set][2]];
+	ram_table.max_reduction[2][2] = max_reduction_table[abm_config[set][2]];
+	ram_table.max_reduction[3][2] = max_reduction_table[abm_config[set][2]];
+	ram_table.max_reduction[4][2] = max_reduction_table[abm_config[set][2]];
+
+	ram_table.min_reduction[0][3] = min_reduction_table[abm_config[set][3]];
+	ram_table.min_reduction[1][3] = min_reduction_table[abm_config[set][3]];
+	ram_table.min_reduction[2][3] = min_reduction_table[abm_config[set][3]];
+	ram_table.min_reduction[3][3] = min_reduction_table[abm_config[set][3]];
+	ram_table.min_reduction[4][3] = min_reduction_table[abm_config[set][3]];
+	ram_table.max_reduction[0][3] = max_reduction_table[abm_config[set][3]];
+	ram_table.max_reduction[1][3] = max_reduction_table[abm_config[set][3]];
+	ram_table.max_reduction[2][3] = max_reduction_table[abm_config[set][3]];
+	ram_table.max_reduction[3][3] = max_reduction_table[abm_config[set][3]];
+	ram_table.max_reduction[4][3] = max_reduction_table[abm_config[set][3]];
+
+	ram_table.bright_pos_gain[0][0] = 0x20;
+	ram_table.bright_pos_gain[0][1] = 0x20;
+	ram_table.bright_pos_gain[0][2] = 0x20;
+	ram_table.bright_pos_gain[0][3] = 0x20;
+	ram_table.bright_pos_gain[1][0] = 0x20;
+	ram_table.bright_pos_gain[1][1] = 0x20;
+	ram_table.bright_pos_gain[1][2] = 0x20;
+	ram_table.bright_pos_gain[1][3] = 0x20;
+	ram_table.bright_pos_gain[2][0] = 0x20;
+	ram_table.bright_pos_gain[2][1] = 0x20;
+	ram_table.bright_pos_gain[2][2] = 0x20;
+	ram_table.bright_pos_gain[2][3] = 0x20;
+	ram_table.bright_pos_gain[3][0] = 0x20;
+	ram_table.bright_pos_gain[3][1] = 0x20;
+	ram_table.bright_pos_gain[3][2] = 0x20;
+	ram_table.bright_pos_gain[3][3] = 0x20;
+	ram_table.bright_pos_gain[4][0] = 0x20;
+	ram_table.bright_pos_gain[4][1] = 0x20;
+	ram_table.bright_pos_gain[4][2] = 0x20;
+	ram_table.bright_pos_gain[4][3] = 0x20;
+	ram_table.bright_neg_gain[0][1] = 0x00;
+	ram_table.bright_neg_gain[0][2] = 0x00;
+	ram_table.bright_neg_gain[0][3] = 0x00;
+	ram_table.bright_neg_gain[1][0] = 0x00;
+	ram_table.bright_neg_gain[1][1] = 0x00;
+	ram_table.bright_neg_gain[1][2] = 0x00;
+	ram_table.bright_neg_gain[1][3] = 0x00;
+	ram_table.bright_neg_gain[2][0] = 0x00;
+	ram_table.bright_neg_gain[2][1] = 0x00;
+	ram_table.bright_neg_gain[2][2] = 0x00;
+	ram_table.bright_neg_gain[2][3] = 0x00;
+	ram_table.bright_neg_gain[3][0] = 0x00;
+	ram_table.bright_neg_gain[3][1] = 0x00;
+	ram_table.bright_neg_gain[3][2] = 0x00;
+	ram_table.bright_neg_gain[3][3] = 0x00;
+	ram_table.bright_neg_gain[4][0] = 0x00;
+	ram_table.bright_neg_gain[4][1] = 0x00;
+	ram_table.bright_neg_gain[4][2] = 0x00;
+	ram_table.bright_neg_gain[4][3] = 0x00;
+	ram_table.dark_pos_gain[0][0] = 0x00;
+	ram_table.dark_pos_gain[0][1] = 0x00;
+	ram_table.dark_pos_gain[0][2] = 0x00;
+	ram_table.dark_pos_gain[0][3] = 0x00;
+	ram_table.dark_pos_gain[1][0] = 0x00;
+	ram_table.dark_pos_gain[1][1] = 0x00;
+	ram_table.dark_pos_gain[1][2] = 0x00;
+	ram_table.dark_pos_gain[1][3] = 0x00;
+	ram_table.dark_pos_gain[2][0] = 0x00;
+	ram_table.dark_pos_gain[2][1] = 0x00;
+	ram_table.dark_pos_gain[2][2] = 0x00;
+	ram_table.dark_pos_gain[2][3] = 0x00;
+	ram_table.dark_pos_gain[3][0] = 0x00;
+	ram_table.dark_pos_gain[3][1] = 0x00;
+	ram_table.dark_pos_gain[3][2] = 0x00;
+	ram_table.dark_pos_gain[3][3] = 0x00;
+	ram_table.dark_pos_gain[4][0] = 0x00;
+	ram_table.dark_pos_gain[4][1] = 0x00;
+	ram_table.dark_pos_gain[4][2] = 0x00;
+	ram_table.dark_pos_gain[4][3] = 0x00;
+	ram_table.dark_neg_gain[0][0] = 0x00;
+	ram_table.dark_neg_gain[0][1] = 0x00;
+	ram_table.dark_neg_gain[0][2] = 0x00;
+	ram_table.dark_neg_gain[0][3] = 0x00;
+	ram_table.dark_neg_gain[1][0] = 0x00;
+	ram_table.dark_neg_gain[1][1] = 0x00;
+	ram_table.dark_neg_gain[1][2] = 0x00;
+	ram_table.dark_neg_gain[1][3] = 0x00;
+	ram_table.dark_neg_gain[2][0] = 0x00;
+	ram_table.dark_neg_gain[2][1] = 0x00;
+	ram_table.dark_neg_gain[2][2] = 0x00;
+	ram_table.dark_neg_gain[2][3] = 0x00;
+	ram_table.dark_neg_gain[3][0] = 0x00;
+	ram_table.dark_neg_gain[3][1] = 0x00;
+	ram_table.dark_neg_gain[3][2] = 0x00;
+	ram_table.dark_neg_gain[3][3] = 0x00;
+	ram_table.dark_neg_gain[4][0] = 0x00;
+	ram_table.dark_neg_gain[4][1] = 0x00;
+	ram_table.dark_neg_gain[4][2] = 0x00;
+	ram_table.dark_neg_gain[4][3] = 0x00;
+	ram_table.iir_curve[0] = 0x65;
+	ram_table.iir_curve[1] = 0x65;
+	ram_table.iir_curve[2] = 0x65;
+	ram_table.iir_curve[3] = 0x65;
+	ram_table.iir_curve[4] = 0x65;
+	ram_table.crgb_thresh[0] = cpu_to_be16(0x13b6);
+	ram_table.crgb_thresh[1] = cpu_to_be16(0x1648);
+	ram_table.crgb_thresh[2] = cpu_to_be16(0x18e3);
+	ram_table.crgb_thresh[3] = cpu_to_be16(0x1b41);
+	ram_table.crgb_thresh[4] = cpu_to_be16(0x1d46);
+	ram_table.crgb_thresh[5] = cpu_to_be16(0x1f21);
+	ram_table.crgb_thresh[6] = cpu_to_be16(0x2167);
+	ram_table.crgb_thresh[7] = cpu_to_be16(0x2384);
+	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(0x3147);
+	ram_table.crgb_slope[1]  = cpu_to_be16(0x2978);
+	ram_table.crgb_slope[2]  = cpu_to_be16(0x23a2);
+	ram_table.crgb_slope[3]  = cpu_to_be16(0x1f55);
+	ram_table.crgb_slope[4]  = cpu_to_be16(0x1c63);
+	ram_table.crgb_slope[5]  = cpu_to_be16(0x1a0f);
+	ram_table.crgb_slope[6]  = cpu_to_be16(0x178d);
+	ram_table.crgb_slope[7]  = cpu_to_be16(0x15ab);
+
+	fill_backlight_transform_table(
+			params, &ram_table);
+
+	return dmcu->funcs->load_iram(
+			dmcu, 0, (char *)(&ram_table), sizeof(ram_table));
+}

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

+/* Copyright 2018 Advanced Micro Devices, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Authors: AMD
+ *
+ */
+
+#ifndef MODULES_POWER_POWER_HELPERS_H_
+#define MODULES_POWER_POWER_HELPERS_H_
+
+#include "dc/inc/hw/dmcu.h"
+
+
+enum abm_defines {
+	abm_defines_max_level = 4,
+	abm_defines_max_config = 4,
+};
+
+struct dmcu_iram_parameters {
+	unsigned int *backlight_lut_array;
+	unsigned int backlight_lut_array_size;
+	unsigned int backlight_ramping_reduction;
+	unsigned int backlight_ramping_start;
+	unsigned int set;
+};
+
+bool dmcu_load_iram(struct dmcu *dmcu,
+		struct dmcu_iram_parameters params);
+
+#endif /* MODULES_POWER_POWER_HELPERS_H_ */