drm/amd/display: Introduce power module on Linux

[Why]

Other OS supported by DC uses the power module to manage panel power
features such as backlight and self-refresh. It contains enhancements
on top what amdgpu_dm is doing today that can benefit power.

[How]

Introduce the power module. It's currently not being used anywhere, a
future change will incorporate it into amdgpu_dm.

Reviewed-by: Leo Li <sunpeng.li@amd.com>
Signed-off-by: Ray Wu <ray.wu@amd.com>
Signed-off-by: Leo Li <sunpeng.li@amd.com>
Signed-off-by: Chenyu Chen <chen-yu.chen@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

6 files changed, 3466 insertions, 1 deletions

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_services.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_services.c
index 8550d5e8b753..0ef7435ffda9 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_services.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_services.c
@@ -62,3 +62,14 @@ void dm_trace_smu_exit(bool success, uint32_t response, struct dc_context *ctx)
 }
 
 /**** power component interfaces ****/
+
+bool dm_query_extended_brightness_caps(struct dc_context *ctx,
+	enum dm_acpi_display_type display,
+	struct dm_acpi_atif_backlight_caps *pCaps)
+{
+	/*
+	 * TODO: Implement query for extended backlight caps.
+	 * Some plumbing required, see amdgpu_atif_query_backlight_caps()
+	 */
+	return false;
+}
diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_stream.c b/drivers/gpu/drm/amd/display/dc/core/dc_stream.c
index 49e4f68ff397..16ff43b58e00 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_stream.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_stream.c
@@ -259,6 +259,12 @@ const struct dc_stream_status *dc_stream_get_status_const(
 	return dc_state_get_stream_status(dc->current_state, stream);
 }
 
+struct dc_link *dc_stream_get_link(
+	const struct dc_stream_state *stream)
+{
+	return stream->link;
+}
+
 void program_cursor_attributes(
 	struct dc *dc,
 	struct dc_stream_state *stream)
diff --git a/drivers/gpu/drm/amd/display/dc/dc_stream.h b/drivers/gpu/drm/amd/display/dc/dc_stream.h
index 88f70a9b64b1..6a8c1390b85f 100644
--- a/drivers/gpu/drm/amd/display/dc/dc_stream.h
+++ b/drivers/gpu/drm/amd/display/dc/dc_stream.h
@@ -494,6 +494,9 @@ struct surface_update_descriptor dc_check_update_surfaces_for_stream(
 		int surface_count,
 		struct dc_stream_update *stream_update);
 
+struct dc_link *dc_stream_get_link(
+	const struct dc_stream_state *dc_stream);
+
 /**
  * Create a new default stream for the requested sink
  */
diff --git a/drivers/gpu/drm/amd/display/modules/inc/mod_power.h b/drivers/gpu/drm/amd/display/modules/inc/mod_power.h
new file mode 100644
index 000000000000..89037f7b7961
--- /dev/null
+++ b/drivers/gpu/drm/amd/display/modules/inc/mod_power.h
@@ -0,0 +1,415 @@
+/* Copyright (c) 2019 Advanced Micro Devices, Inc. All rights reserved. */
+
+#ifndef MODULES_INC_MOD_POWER_H_
+#define MODULES_INC_MOD_POWER_H_
+
+#include "dm_services.h"
+
+struct mod_power_init_params {
+
+	bool disable_fractional_pwm;
+
+	/* Use nits based brightness instead of brightness percentage
+	 */
+	bool use_nits_based_brightness;
+	unsigned int panel_min_millinits;
+	unsigned int panel_max_millinits;
+
+	unsigned int min_backlight_pwm;
+	unsigned int max_backlight_pwm;
+
+	unsigned int min_abm_backlight;
+	unsigned int num_backlight_levels;
+	bool backlight_ramping_override;
+	unsigned int backlight_ramping_reduction;
+	unsigned int backlight_ramping_start;
+	bool def_varibright_enable;
+	unsigned int def_varibright_level;
+	unsigned int varibright_level;
+	unsigned int abm_config_setting;
+
+	bool allow_psr_smu_optimizations;
+
+	bool allow_psr_multi_disp_optimizations;
+
+	bool use_custom_backlight_caps;
+	unsigned int custom_backlight_caps_config_no;
+	bool use_linear_backlight_curve;
+};
+
+struct mod_power {
+	int dummy;
+};
+
+/* VariBright settings structure */
+struct varibright_info {
+	unsigned int level;
+	bool enable;
+	bool activate;
+};
+
+struct mod_power_psr_context {
+    /* ddc line */
+    unsigned int channel;
+    /* Transmitter id */
+    unsigned int transmitter_id;
+    /* Engine Id is used for Dig Be source select */
+    unsigned int engine_id;
+    /* Controller Id used for Dig Fe source select */
+    unsigned int controller_id;
+    /* Pcie or Uniphy */
+    unsigned int phy_type;
+    /* Physical PHY Id used by SMU interpretation */
+    unsigned int smu_phy_id;
+    /* Vertical total pixels from crtc timing.
+     * This is used for static screen detection.
+     * ie. If we want to detect half a frame,
+     * we use this to determine the hyst lines.
+     */
+    unsigned int crtc_timing_vertical_total;
+    /* PSR supported from panel capabilities and
+     * current display configuration
+     */
+    bool psr_supported_display_config;
+    /* Whether fast link training is supported by the panel */
+    bool psr_exit_link_training_required;
+    /* If RFB setup time is greater than the total VBLANK time,
+     * it is not possible for the sink to capture the video frame
+     * in the same frame the SDP is sent. In this case,
+     * the frame capture indication bit should be set and an extra
+     * static frame should be transmitted to the sink.
+     */
+    bool psr_frame_capture_indication_req;
+    /* Set the last possible line SDP may be transmitted without violating
+     * the RFB setup time or entering the active video frame.
+     */
+    unsigned int sdp_transmit_line_num_deadline;
+    /* The VSync rate in Hz used to calculate the
+     * step size for smooth brightness feature
+     */
+    unsigned int vsync_rate_hz;
+    unsigned int skip_psr_wait_for_pll_lock;
+    unsigned int number_of_controllers;
+    /* Unused, for future use. To indicate that first changed frame from
+     * state3 shouldn't result in psr_inactive, but rather to perform
+     * an automatic single frame rfb_update.
+     */
+    bool rfb_update_auto_en;
+    /* Number of frame before entering static screen */
+    unsigned int timehyst_frames;
+    /* Partial frames before entering static screen */
+    unsigned int hyst_lines;
+    /* # of repeated AUX transaction attempts to make before
+     * indicating failure to the driver
+     */
+    unsigned int aux_repeats;
+    /* Controls hw blocks to power down during PSR active state */
+    unsigned int psr_level;
+    /* Controls additional delay after remote frame capture before
+     * continuing powerd own
+     */
+	unsigned int frame_delay;
+	bool allow_smu_optimizations;
+	bool allow_multi_disp_optimizations;
+	unsigned int line_time_in_us;
+	/* Panel self refresh 2 selective update granularity required */
+	bool su_granularity_required;
+	/* psr2 selective update y granularity capability */
+	uint8_t su_y_granularity;
+	uint8_t rate_control_caps;
+	bool os_request_force_ffu;
+};
+
+enum psr_event {
+	psr_event_invalid = 0x0,
+	psr_event_vsync = 0x1,
+	psr_event_full_screen = 0x2,
+	psr_event_defer_enable = 0x4,
+	psr_event_hw_programming = 0x8,
+	psr_event_test_harness_enable_psr = 0x10,
+	psr_event_test_harness_disable_psr = 0x20,
+	psr_event_mpo_video_selective_update = 0x40,
+	psr_event_edp_panel_off_disable_psr = 0x80,
+	psr_event_dynamic_display_switch = 0x100,
+	psr_event_big_screen_video = 0x200,
+	psr_event_dds_defer_stream_enable = 0x800,
+	psr_event_dynamic_link_rate_control = 0x1000,
+	psr_event_vrr_transition = 0x2000,
+	psr_event_pause = 0x4000,
+	psr_event_immediate_flip = 0x8000,
+	psr_event_os_request_disable = 0x10000,
+	psr_event_os_request_force_ffu = 0x20000,
+	psr_event_os_override_hold = 0x40000,
+	psr_event_crc_window_active = 0x80000,
+};
+
+enum replay_event {
+	replay_event_invalid = 0x0,
+	replay_event_vsync = 0x1,
+	replay_event_full_screen = 0x2,
+	replay_event_mpo_video_selective_update = 0x4,
+	replay_event_big_screen_video = 0x8,
+	replay_event_hw_programming = 0x10,
+	replay_event_edp_panel_off_disable_psr = 0x20,
+	replay_event_general_ui = 0x40,
+	replay_event_vrr = 0x80,
+	replay_event_prepare_vtotal = 0x100,
+	replay_event_test_harness_enable_replay = 0x200,
+	replay_event_test_harness_disable_replay = 0x400,
+	replay_event_test_harness_ultra_sleep = 0x800,
+	replay_event_immediate_flip = 0x1000,
+	replay_event_vrr_transition = 0x2000,
+	replay_event_pause = 0x4000,
+	replay_event_disable_replay_while_DPMS = 0x8000,
+	replay_event_test_harness_mode = 0x10000,
+	replay_event_cursor_updating = 0x20000,
+	replay_event_sleep_resume = 0x40000,
+	replay_event_disable_in_AC = 0x80000,
+	replay_event_disable_replay_while_detect_display = 0x100000,
+	replay_event_disable_replay_while_switching_mux = 0x400000,
+	replay_event_infopacket = 0x800000,
+	replay_event_os_request_disable = 0x1000000,
+	replay_event_os_request_force_ffu = 0x2000000,
+	replay_event_os_override_hold = 0x4000000,
+	replay_event_crc_window_active = 0x8000000,
+};
+
+enum replay_enable_option {
+	pr_enable_option_static_screen = 0x1,
+	pr_enable_option_mpo_video = 0x2,
+	pr_enable_option_full_screen_video = 0x4,
+	pr_enable_option_general_ui = 0x8,
+	pr_enable_option_full_screen = 0x10,
+	pr_enable_option_static_screen_coasting = 0x10000,
+	pr_enable_option_mpo_video_coasting = 0x20000,
+	pr_enable_option_full_screen_video_coasting = 0x40000,
+	pr_enable_option_full_screen_coasting = 0x100000,
+};
+
+struct mod_power *mod_power_create(struct dc *dc,
+		struct mod_power_init_params *init_params,
+		unsigned int edp_num);
+
+void mod_power_destroy(struct mod_power *mod_power);
+
+bool mod_power_hw_init(struct mod_power *mod_power);
+
+bool mod_power_add_stream(struct mod_power *mod_power,
+		struct dc_stream_state *stream, struct psr_caps *caps);
+
+bool mod_power_remove_stream(struct mod_power *mod_power,
+		const struct dc_stream_state *stream);
+
+bool mod_power_replace_stream(struct mod_power *mod_power,
+		const struct dc_stream_state *current_stream,
+		struct dc_stream_state *new_stream,
+		struct psr_caps *new_caps);
+
+bool mod_power_set_backlight_nits(struct mod_power *mod_power,
+		struct dc_stream_state *streams,
+		unsigned int backlight_millinit,
+		unsigned int transition_time_millisec,
+		bool skip_aux,
+		bool is_hdr);
+
+bool mod_power_set_backlight_percent(struct mod_power *mod_power,
+		struct dc_stream_state *stream,
+		unsigned int backlight_millipercent,
+		unsigned int transition_time_millisec,
+		bool is_hdr);
+
+void mod_power_update_backlight(struct mod_power *mod_power,
+		struct dc_stream_state *stream,
+		unsigned int backlight_millipercent);
+
+void mod_power_update_backlight_nits(struct mod_power *mod_power,
+		struct dc_stream_state *stream,
+		unsigned int backlight_millinit);
+
+bool mod_power_get_backlight_pwm(struct mod_power *mod_power,
+		unsigned int *backlight_pwm,
+		unsigned int inst);
+
+bool mod_power_get_backlight_nits(struct mod_power *mod_power,
+		unsigned int *backlight_millinit,
+		unsigned int inst);
+
+bool mod_power_get_backlight_percent(struct mod_power *mod_power,
+		unsigned int *backlight_millipercent,
+		unsigned int inst);
+
+bool mod_power_get_hw_target_backlight_pwm_nits(
+		struct mod_power *mod_power,
+		const struct dc_link *link,
+		unsigned int *backlight_millinit,
+		unsigned int inst);
+
+bool mod_power_get_hw_target_backlight_pwm_percent(
+		struct mod_power *mod_power,
+		const struct dc_link *link,
+		unsigned int *backlight_millipercent,
+		unsigned int inst);
+
+bool mod_power_get_hw_target_backlight_pwm(
+		struct mod_power *mod_power,
+		const struct dc_link *link,
+		unsigned int *backlight_u16_16);
+
+bool mod_power_get_hw_backlight_pwm(
+		struct mod_power *mod_power,
+		const struct dc_link *link,
+		unsigned int *backlight);
+
+bool mod_power_get_hw_backlight_pwm_nits(
+		struct mod_power *mod_power,
+		const struct dc_link *link,
+		unsigned int *backlight_millinit,
+		unsigned int inst);
+
+bool mod_power_get_hw_backlight_aux_nits(
+		struct mod_power *mod_power,
+		struct dc_stream_state **streams, int num_streams,
+		unsigned int *backlight_millinit_avg,
+		unsigned int *backlight_millinit_peak);
+
+bool mod_power_get_hw_backlight_pwm_percent(
+		struct mod_power *mod_power,
+		const struct dc_link *link,
+		unsigned int *backlight_millipercent,
+		unsigned int inst);
+
+void mod_power_initialize_backlight_caps
+		(struct mod_power *mod_power);
+
+bool mod_power_get_panel_backlight_boundaries
+				(struct mod_power *mod_power,
+				unsigned int *out_min_backlight,
+				unsigned int *out_max_backlight,
+				unsigned int *out_ac_backlight_percent,
+				unsigned int *out_dc_backlight_percent,
+				unsigned int inst);
+
+bool mod_power_set_smooth_brightness(struct mod_power *mod_power,
+		bool enable_brightness,
+		unsigned int inst);
+
+bool mod_power_notify_mode_change(struct mod_power *mod_power,
+		const struct dc_stream_state *stream,
+		bool is_hdr);
+
+bool mod_power_get_varibright_level(struct mod_power *mod_power,
+		unsigned int *varibright_level);
+
+bool mod_power_get_varibright_hw_level(struct mod_power *mod_power,
+		unsigned int *varibright_level);
+
+bool mod_power_get_varibright_default_level(struct mod_power *mod_power,
+		unsigned int *varibright_level);
+
+bool mod_power_get_varibright_enable(struct mod_power *mod_power,
+		bool *varibright_enable);
+
+bool mod_power_varibright_activate(struct mod_power	*mod_power,
+		bool activate, struct dc_stream_update *stream_update);
+
+bool mod_power_varibright_feature_enable(struct mod_power *mod_power,
+		bool enable, struct dc_stream_update *stream_update);
+
+
+bool mod_power_varibright_set_level(struct mod_power *mod_power,
+		unsigned int level, struct dc_stream_update *stream_update);
+
+bool mod_power_varibright_set_hw_level(struct mod_power *mod_power,
+		unsigned int level,	struct dc_stream_update *stream_update);
+
+bool mod_power_is_abm_active(struct mod_power *mod_power,
+		const struct dc_link *link,
+		unsigned int inst);
+
+
+bool mod_power_set_psr_event(struct mod_power *mod_power,
+		struct dc_stream_state *stream, bool set_event,
+		enum psr_event event, bool wait);
+
+bool mod_power_get_psr_event(struct mod_power *mod_power,
+			struct dc_stream_state *stream,
+			unsigned int *active_psr_events);
+
+bool mod_power_get_psr_state(struct mod_power *mod_power,
+		const struct dc_stream_state *stream,
+		enum dc_psr_state *state);
+
+bool mod_power_get_psr_enabled_status(struct mod_power *mod_power,
+		const struct dc_stream_state *stream,
+		bool *psr_enabled);
+
+bool mod_power_set_replay_event(struct mod_power *mod_power,
+	struct dc_stream_state *stream, bool set_event,
+	enum replay_event event, bool wait_for_disable);
+
+bool mod_power_get_replay_event(struct mod_power *mod_power,
+	struct dc_stream_state *stream,
+	unsigned int *active_replay_events);
+
+bool mod_power_get_replay_active_status(const struct dc_stream_state *stream,
+	bool *replay_active);
+
+bool mod_power_replay_set_coasting_vtotal(struct mod_power *mod_power,
+	const struct dc_stream_state *stream,
+	uint32_t coasting_vtotal, uint16_t frame_skip_number);
+
+void mod_power_replay_residency(const struct dc_stream_state *stream,
+	unsigned int *residency, const bool is_start, const bool is_alpm);
+
+bool mod_power_replay_set_power_opt_and_coasting_vtotal(struct mod_power *mod_power,
+	const struct dc_stream_state *stream, unsigned int active_replay_events, uint32_t coasting_vtotal,
+	bool is_ultra_sleep_mode, uint16_t frame_skip_number);
+
+void mod_power_replay_set_timing_sync_supported(struct mod_power *mod_power,
+	const struct dc_stream_state *stream);
+
+void mod_power_replay_disabled_adaptive_sync_sdp(struct mod_power *mod_power,
+	const struct dc_stream_state *stream, bool force_disabled);
+
+void mod_power_replay_disabled_desync_error_detection(struct mod_power *mod_power,
+	const struct dc_stream_state *stream,  bool force_disabled);
+void mod_power_set_low_rr_activate(struct mod_power *mod_power,
+	const struct dc_stream_state *stream, bool low_rr_supported);
+
+void mod_power_set_video_conferencing_activate(struct mod_power *mod_power,
+	const struct dc_stream_state *stream, bool video_conferencing_activate);
+
+void mod_power_set_live_capture_with_cvt_activate(struct mod_power *mod_power,
+	const struct dc_stream_state *stream, bool live_capture_with_cvt_activate);
+
+void mod_power_set_replay_continuously_resync(struct mod_power *mod_power,
+	const struct dc_stream_state *stream, bool enable);
+
+void mod_power_set_coasting_vtotal_without_frame_update(struct mod_power *mod_power,
+	const struct dc_stream_state *stream, uint32_t coasting_vtotal);
+
+
+
+void mod_power_psr_residency(struct mod_power *mod_power,
+		const struct dc_stream_state *stream,
+		unsigned int *residency,
+		const uint8_t mode);
+bool mod_power_psr_get_active_psr_events(struct mod_power *mod_power,
+		const struct dc_stream_state *stream, unsigned int *active_psr_events);
+bool mod_power_psr_set_sink_vtotal_in_psr_active(struct mod_power *mod_power,
+		const struct dc_stream_state *stream,
+		uint16_t psr_vtotal_idle,
+		uint16_t psr_vtotal_su);
+
+
+
+bool mod_power_backlight_percent_to_nits(struct mod_power *mod_power,
+		struct dc_stream_state *stream,
+		unsigned int backlight_millipercent,
+		unsigned int *backlight_millinit);
+bool mod_power_backlight_nits_to_percent(struct mod_power *mod_power,
+		struct dc_stream_state *stream,
+		unsigned int backlight_millinit,
+		unsigned int *backlight_millipercent);
+
+#endif /* MODULES_INC_MOD_POWER_H_ */
diff --git a/drivers/gpu/drm/amd/display/modules/power/Makefile b/drivers/gpu/drm/amd/display/modules/power/Makefile
index 9d1b22d35ece..b27a1ff3d86b 100644
--- a/drivers/gpu/drm/amd/display/modules/power/Makefile
+++ b/drivers/gpu/drm/amd/display/modules/power/Makefile
@@ -23,7 +23,7 @@
 # Makefile for the 'power' sub-module of DAL.
 #
 
-MOD_POWER = power_helpers.o
+MOD_POWER = power_helpers.o power.o
 
 AMD_DAL_MOD_POWER = $(addprefix $(AMDDALPATH)/modules/power/,$(MOD_POWER))
 #$(info ************  DAL POWER MODULE MAKEFILE ************)
diff --git a/drivers/gpu/drm/amd/display/modules/power/power.c b/drivers/gpu/drm/amd/display/modules/power/power.c
new file mode 100644
index 000000000000..6c73fecf57d5
--- /dev/null
+++ b/drivers/gpu/drm/amd/display/modules/power/power.c
@@ -0,0 +1,3030 @@
+/*
+ * Copyright 2016 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 "dm_services.h"
+#include "dc.h"
+#include "mod_power.h"
+#include "core_types.h"
+#include "dmcu.h"
+#include "abm.h"
+#include "power_helpers.h"
+#include "dce/dmub_psr.h"
+#include "dal_asic_id.h"
+#include "link_service.h"
+#include <linux/math.h>
+
+#define DC_TRACE_LEVEL_MESSAGE(...) /* do nothing */
+#define DC_TRACE_LEVEL_MESSAGEP(...) /* do nothing */
+
+#define MOD_POWER_MAX_CONCURRENT_STREAMS 32
+#define SMOOTH_BRIGHTNESS_ADJUSTMENT_TIME_IN_MS 500
+#define LOW_REFRESH_RATE_DURATION_US_UPPER_BOUND 25000
+
+
+struct backlight_state {
+	/* HW uses u16.16 format for backlight PWM */
+	unsigned int backlight_pwm;
+	/* DM may call power module to set backlight
+	 * targeting percent brightness
+	 */
+	unsigned int backlight_millipercent;
+	/* DM may call power module to set backlight based on an explicit
+	 * nits value.
+	 */
+	unsigned int backlight_millinit;
+	unsigned int frame_ramp;
+	bool smooth_brightness_enabled;
+	bool isHDR;
+};
+struct power_entity {
+	struct dc_stream_state *stream;
+	struct psr_caps *caps;
+	struct mod_power_psr_context *psr_context;
+
+	/*PSR cached properties*/
+	bool psr_enabled;
+	unsigned int psr_events;
+	unsigned int psr_power_opt;
+	unsigned int replay_events;
+};
+
+struct backlight_properties {
+	bool use_nits_based_brightness;
+	bool disable_fractional_pwm;
+
+	unsigned int min_abm_backlight;
+	unsigned int num_backlight_levels;
+
+	bool backlight_ramping_override;
+	unsigned int backlight_ramping_reduction;
+	unsigned int backlight_ramping_start;
+
+	/* Backlight cached properties */
+	unsigned int ac_backlight_percent;
+	unsigned int dc_backlight_percent;
+
+	/* backlight LUT stored in HW u16.16 format*/
+	unsigned int *backlight_lut;
+	unsigned int min_backlight_pwm;
+	unsigned int max_backlight_pwm;
+	unsigned int backlight_range;
+
+	/* Describes the panel's min and max luminance in millinits measured
+	 * on full white screen, in min and max backlight settings.
+	 */
+	unsigned int min_brightness_millinits;
+	unsigned int max_brightness_millinits;
+	unsigned int nits_range;
+
+	bool backlight_caps_valid;
+	bool use_custom_backlight_caps;
+	unsigned int custom_backlight_caps_config_no;
+	bool use_linear_backlight_curve;
+};
+
+struct dmcu_varibright_cached_properties {
+	unsigned int varibright_config_setting;
+	unsigned int varibright_level;
+	unsigned int varibright_hw_level;
+	unsigned int def_varibright_level;
+	bool varibright_user_enable;
+	bool varibright_active;
+};
+
+struct core_power {
+	struct mod_power public;
+	struct dc *dc;
+	struct power_entity *map;
+	struct dmcu_varibright_cached_properties varibright_prop;
+	struct backlight_properties bl_prop[MAX_NUM_EDP];
+	struct backlight_state bl_state[MAX_NUM_EDP];
+	unsigned int edp_num;
+
+	bool psr_smu_optimizations_support;
+	bool multi_disp_optimizations_support;
+
+	int num_entities;
+};
+
+union dmcu_abm_set_bl_params {
+	struct {
+		unsigned int gradual_change : 1; /* [0:0] */
+		unsigned int reserved : 15; /* [15:1] */
+		unsigned int frame_ramp : 16; /* [31:16] */
+	} bits;
+	unsigned int u32All;
+};
+
+/* If system or panel does not report some sort of brightness percent to nits
+ * mapping, we will use following default values so backlight control using
+ * nits based interfaces will still work, but might not describe panel
+ * correctly. In this case percentage based backlight control should ideally
+ * be used.
+ * Min = 5 nits
+ * Max = 300 nits
+ */
+
+static const unsigned int pwr_default_min_brightness_millinits = 1000;
+static const unsigned int pwr_default_sdr_brightness_millinits = 270000;
+
+static const unsigned int default_ac_backlight_percent   = 100;
+static const unsigned int default_dc_backlight_percent   = 70;
+
+#define MOD_POWER_TO_CORE(mod_power)\
+		container_of(mod_power, struct core_power, public)
+
+static unsigned int calc_psr_num_static_frames(unsigned int vsync_rate_hz)
+{
+	/* Calculate number of static frames before generating interrupt to
+	 * enter PSR.
+	 */
+	unsigned int frame_time_microsec = 1000000 / vsync_rate_hz;
+
+	// Init fail safe of 2 frames static
+	unsigned int num_frames_static = 2;
+
+	/* Round up
+	 * Calculate number of frames such that at least 30 ms of time has
+	 * passed.
+	 */
+	if (vsync_rate_hz != 0)
+		num_frames_static = (30000 / frame_time_microsec) + 1;
+
+	return num_frames_static;
+}
+
+/* Given a specific dc_stream* this function finds its equivalent
+ * on the core_freesync->map and returns the corresponding index
+ */
+static unsigned int map_index_from_stream(struct core_power *core_power,
+		const struct dc_stream_state *stream)
+{
+	unsigned int index = 0;
+
+	for (index = 0; index < core_power->num_entities; index++) {
+		if (core_power->map[index].stream == stream)
+			return index;
+	}
+	/* Could not find stream requested, this is not trivial, fix when hit*/
+	DC_TRACE_LEVEL_MESSAGE(DAL_TRACE_LEVEL_ERROR,
+						WPP_BIT_FLAG_Firmware_PsrState,
+						"map index from stream: ERROR: core_power=%p stream=%p",
+						core_power,
+						stream);
+	ASSERT(false);
+	/* We come here only when we can't map stream index.
+	 * In good cases, this would happen when we attempt to change
+	 * brightness before stream creation, in which case we create a
+	 * dummy stream with index 0.
+	 * With external monitor connected, the index passed from this return
+	 * is 1. Passing anything greater than 0 from here would always point
+	 * to bad memory.
+	 */
+	return 0;
+}
+
+static uint16_t backlight_8_to_16(unsigned int backlight_8bit)
+{
+	return (uint16_t)(backlight_8bit * 0x101);
+}
+
+
+static unsigned int backlight_millipercent_to_millinit(
+		struct core_power *core_power, unsigned int millipercent, unsigned int inst)
+{
+	unsigned int millinit = 0;
+	unsigned long long numerator = 0;
+
+	if (core_power == NULL)
+		return 0;
+
+	numerator = ((unsigned long long)millipercent) *
+				core_power->bl_prop[inst].nits_range;
+	millinit = ((unsigned int)div_u64(numerator, 100000)) +
+			core_power->bl_prop[inst].min_brightness_millinits;
+
+	return millinit;
+}
+
+static unsigned int backlight_millinit_to_millipercent(
+		struct core_power *core_power, unsigned int millinit, unsigned int inst)
+{
+	unsigned int millipercent = 0;
+	unsigned long long numerator = 0;
+
+	if (core_power == NULL)
+		return 0;
+
+	if (millinit <= core_power->bl_prop[inst].min_brightness_millinits)
+		return 0;
+
+	if (millinit >= core_power->bl_prop[inst].max_brightness_millinits)
+		return (100 * 1000);
+
+	numerator = (((unsigned long long)millinit) -
+			core_power->bl_prop[inst].min_brightness_millinits) * 100000;
+	millipercent = ((unsigned int)div_u64(numerator,
+				core_power->bl_prop[inst].nits_range));
+
+	return millipercent;
+}
+
+static unsigned int backlight_pwm_to_millipercent(
+		struct core_power *core_power, unsigned int pwm, unsigned int inst)
+{
+	unsigned int millipercent = 0;
+	unsigned int max_index = 0;
+
+	if (core_power == NULL)
+		return 0;
+
+	if (!core_power->bl_prop[inst].backlight_caps_valid)
+		return 0;
+
+	/* Doesn't really make sense to have one single backlight level
+	 * possible...
+	 */
+	if (core_power->bl_prop[inst].num_backlight_levels < 2)
+		return 0;
+
+	max_index = core_power->bl_prop[inst].num_backlight_levels - 1;
+
+	if (pwm <= core_power->bl_prop[inst].backlight_lut[0])
+		return 0;
+
+	if (pwm > core_power->bl_prop[inst].backlight_lut[max_index])
+		return (100 * 1000);
+
+	/* We need to do a binary search over the array for where the pwm level
+	 * is in the lut. Based on the index we can determine percentage.
+	 */
+	unsigned int min = 0;
+	unsigned int max = max_index;
+	unsigned int mid = 0;
+
+	while (max >= min) {
+		mid = (min + max) / 2; /* floor of half range */
+
+		if (core_power->bl_prop[inst].backlight_lut[mid] < pwm)
+			min = mid + 1;
+		else if (core_power->bl_prop[inst].backlight_lut[mid] > pwm)
+			max = mid - 1;
+		else
+			break;
+	}
+
+	/* In this case, exact match is not found. Check if mid/min/max
+	 * value is actually closer.
+	 */
+	if (max < min) {
+		unsigned int min_delta;
+		unsigned int mid_delta;
+		unsigned int max_delta;
+
+		min_delta = (core_power->bl_prop[inst].backlight_lut[min] > pwm) ?
+				core_power->bl_prop[inst].backlight_lut[min] - pwm :
+				pwm - core_power->bl_prop[inst].backlight_lut[min];
+
+		mid_delta = (core_power->bl_prop[inst].backlight_lut[mid] > pwm) ?
+				core_power->bl_prop[inst].backlight_lut[mid] - pwm :
+				pwm - core_power->bl_prop[inst].backlight_lut[mid];
+
+		max_delta = (core_power->bl_prop[inst].backlight_lut[max] > pwm) ?
+				core_power->bl_prop[inst].backlight_lut[max] - pwm :
+				pwm - core_power->bl_prop[inst].backlight_lut[max];
+
+		if ((min_delta < mid_delta) && (min_delta < max_delta))
+			mid = min;
+
+		if ((max_delta < mid_delta) && (max_delta < min_delta))
+			mid = max;
+	}
+
+	/* No interpolation, just take closest index */
+	millipercent = 1000 * 100 * mid / max_index;
+
+	return millipercent;
+}
+
+static unsigned int backlight_pwm_to_millinit(
+		struct core_power *core_power, unsigned int pwm, unsigned int inst)
+{
+	unsigned int millinit = 0;
+
+	if (core_power == NULL)
+		return 0;
+
+	if (pwm <= core_power->bl_prop[inst].min_backlight_pwm)
+		return core_power->bl_prop[inst].min_brightness_millinits;
+
+	if (pwm >= core_power->bl_prop[inst].max_backlight_pwm)
+		return core_power->bl_prop[inst].max_brightness_millinits;
+
+	millinit = ((unsigned int)div_u64(((unsigned long long)pwm -
+				core_power->bl_prop[inst].min_backlight_pwm) *
+				core_power->bl_prop[inst].nits_range,
+				core_power->bl_prop[inst].backlight_range));
+
+	millinit += core_power->bl_prop[inst].min_brightness_millinits;
+
+	if (millinit > core_power->bl_prop[inst].max_brightness_millinits)
+		millinit = core_power->bl_prop[inst].max_brightness_millinits;
+
+	return millinit;
+}
+
+static unsigned int backlight_millipercent_to_pwm(
+		struct core_power *core_power, unsigned int millipercent, unsigned int inst)
+{
+	unsigned int pwm = (unsigned int)-1;
+	unsigned int index = 0;
+
+	if (core_power == NULL)
+		return 0;
+
+	// Bypass the brightness mapping LUT
+	if (core_power->bl_prop->use_linear_backlight_curve) {
+		pwm = core_power->bl_prop[inst].min_backlight_pwm +
+			(unsigned int) div_u64((unsigned long long) millipercent *
+			core_power->bl_prop[inst].backlight_range,
+			100000);
+
+		if (pwm > core_power->bl_prop[inst].max_backlight_pwm)
+			pwm = core_power->bl_prop[inst].max_backlight_pwm;
+
+		return pwm;
+	}
+
+	if (millipercent >= (100 * 1000))
+		return core_power->bl_prop[inst].backlight_lut[core_power->bl_prop[inst].num_backlight_levels - 1];
+
+	/* This will give the floor index. */
+	index = ((core_power->bl_prop[inst].num_backlight_levels - 1) *
+						millipercent) / 100000;
+	/* Null check otherwise eDP doesn't lightup when connected to DP1 */
+	if (core_power->bl_prop[inst].backlight_lut == NULL)
+		return pwm;
+
+	pwm = core_power->bl_prop[inst].backlight_lut[index];
+
+	return pwm;
+}
+
+static unsigned int backlight_millinit_to_pwm(
+		struct core_power *core_power, unsigned int millinit, unsigned int inst)
+{
+	unsigned int pwm = 0;
+
+	if (core_power == NULL)
+		return 0;
+
+	/* For nits based brightness, the signal will be a value
+	 * between the minimum and maximum value.
+	 */
+	if (millinit >= core_power->bl_prop[inst].max_brightness_millinits)
+		return core_power->bl_prop[inst].max_backlight_pwm;
+	else if (millinit <= core_power->bl_prop[inst].min_brightness_millinits)
+		return core_power->bl_prop[inst].min_backlight_pwm;
+
+	pwm = ((unsigned int)div_u64(((unsigned long long)millinit -
+			core_power->bl_prop[inst].min_brightness_millinits) *
+			core_power->bl_prop[inst].backlight_range,
+			core_power->bl_prop[inst].nits_range));
+
+	pwm += core_power->bl_prop[inst].min_backlight_pwm;
+
+	if (pwm > core_power->bl_prop[inst].max_backlight_pwm)
+		pwm = core_power->bl_prop[inst].max_backlight_pwm;
+
+	return pwm;
+}
+
+static bool validate_ext_backlight_caps(
+		struct dm_acpi_atif_backlight_caps *ext_backlight_caps)
+{
+	unsigned int i;
+	unsigned int num_of_data_points = 0;
+	unsigned int last_signal_level = 0;
+	unsigned int last_luminance = 0;
+
+	num_of_data_points = ext_backlight_caps->num_data_points;
+
+	/* Validation rules:
+	 * 1. BIOS should carry customized data points and
+	 * the number of data points should not be larger than 99.
+	 * 2. The max_input_signal should be larger than min_input_signal.
+	 * 3. For each data point:
+	 *	a. luminance should be in ascending order and
+	 *	should not be 0 or 100 since the corresponding signal_level
+	 *	are assigned by min_input_signal and max_input_signal.
+	 *	b. signal_level should be in ascending order and
+	 *	be within the range of min/max_input_signal.
+	 */
+	if (num_of_data_points > BL_DATA_POINTS)
+		return false;
+
+	if (ext_backlight_caps->min_input_signal >= ext_backlight_caps->max_input_signal)
+		return false;
+
+	last_signal_level = ext_backlight_caps->min_input_signal;
+	for (i = 0; i < num_of_data_points; i++) {
+		unsigned int luminance = ext_backlight_caps->data_points[i].luminance;
+		unsigned int signal_level = ext_backlight_caps->data_points[i].signal_level;
+
+		if ((luminance <= last_luminance) || (luminance > BL_DATA_POINTS))
+			return false;
+
+		if ((signal_level <= last_signal_level) || (signal_level >= ext_backlight_caps->max_input_signal))
+			return false;
+
+		last_signal_level = signal_level;
+		last_luminance = luminance;
+	}
+
+	return true;
+}
+
+/* hard coded to default backlight curve. */
+static void initialize_backlight_caps(struct core_power *core_power, unsigned int inst)
+{
+	unsigned int i;
+	struct dm_acpi_atif_backlight_caps *ext_backlight_caps = NULL;
+	bool custom_curve_present = false;
+	unsigned in