path: root/common/recipes-kernel/linux/linux-yocto-4.14.71/2484-drm-amd-display-moving-backlight-registers-to-hwsequ.patch

From 1579801a34762a9373c11a42406a7a0da68ae87e Mon Sep 17 00:00:00 2001
From: Yue Hin Lau <Yuehin.Lau@amd.com>
Date: Fri, 15 Sep 2017 17:42:20 -0400
Subject: [PATCH 2484/4131] drm/amd/display: moving backlight registers to
 hwsequencer

Signed-off-by: Yue Hin Lau <Yuehin.Lau@amd.com>
Reviewed-by: Dmytro Laktyushkin <Dmytro.Laktyushkin@amd.com>
Acked-by: Harry Wentland <Harry.Wentland@amd.com>
---
 drivers/gpu/drm/amd/display/dc/core/dc_link.c      |   2 +-
 drivers/gpu/drm/amd/display/dc/core/dc_link_hwss.c |  11 ++-
 drivers/gpu/drm/amd/display/dc/dce/dce_hwseq.h     |  47 +++++++---
 .../gpu/drm/amd/display/dc/dce/dce_link_encoder.c  |  79 +---------------
 .../gpu/drm/amd/display/dc/dce/dce_link_encoder.h  |  27 ++----
 .../amd/display/dc/dce110/dce110_hw_sequencer.c    | 103 ++++++++++++++++++++-
 .../gpu/drm/amd/display/dc/inc/hw/link_encoder.h   |   4 +-
 drivers/gpu/drm/amd/display/dc/inc/hw_sequencer.h  |   4 +
 .../amd/display/dc/virtual/virtual_link_encoder.c  |   8 +-
 9 files changed, 158 insertions(+), 127 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link.c b/drivers/gpu/drm/amd/display/dc/core/dc_link.c
index c7751a3..976f0f1 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_link.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_link.c
@@ -1807,7 +1807,7 @@ static void disable_link(struct dc_link *link, enum signal_type signal)
 		else
 			dp_disable_link_phy_mst(link, signal);
 	} else
-		link->link_enc->funcs->disable_output(link->link_enc, signal);
+		link->link_enc->funcs->disable_output(link->link_enc, signal, link);
 }
 
 enum dc_status dc_link_validate_mode_timing(
diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link_hwss.c b/drivers/gpu/drm/amd/display/dc/core/dc_link_hwss.c
index 5f815ca..fa22505 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_link_hwss.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_link_hwss.c
@@ -94,7 +94,7 @@ void dp_enable_link_phy(
 						link_enc,
 						link_settings,
 						clock_source);
-			link_enc->funcs->backlight_control(link_enc, true);
+			link->dc->hwss.backlight_control(link, true);
 		} else
 			link_enc->funcs->enable_dp_output(
 						link_enc,
@@ -138,12 +138,12 @@ void dp_disable_link_phy(struct dc_link *link, enum signal_type signal)
 		dp_receiver_power_ctrl(link, false);
 
 	if (signal == SIGNAL_TYPE_EDP) {
-		link->link_enc->funcs->backlight_control(link->link_enc, false);
+		link->dc->hwss.backlight_control(link, false);
 		edp_receiver_ready_T9(link);
-		link->link_enc->funcs->disable_output(link->link_enc, signal);
+		link->link_enc->funcs->disable_output(link->link_enc, signal, link);
 		link->link_enc->funcs->power_control(link->link_enc, false);
 	} else
-		link->link_enc->funcs->disable_output(link->link_enc, signal);
+		link->link_enc->funcs->disable_output(link->link_enc, signal, link);
 
 	/* Clear current link setting.*/
 	memset(&link->cur_link_settings, 0,
@@ -286,7 +286,8 @@ void dp_retrain_link_dp_test(struct dc_link *link,
 
 			link->link_enc->funcs->disable_output(
 					link->link_enc,
-					SIGNAL_TYPE_DISPLAY_PORT);
+					SIGNAL_TYPE_DISPLAY_PORT,
+					link);
 
 			/* Clear current link setting. */
 			memset(&link->cur_link_settings, 0,
diff --git a/drivers/gpu/drm/amd/display/dc/dce/dce_hwseq.h b/drivers/gpu/drm/amd/display/dc/dce/dce_hwseq.h
index 5798001..227c9b6 100644
--- a/drivers/gpu/drm/amd/display/dc/dce/dce_hwseq.h
+++ b/drivers/gpu/drm/amd/display/dc/dce/dce_hwseq.h
@@ -27,6 +27,10 @@
 
 #include "hw_sequencer.h"
 
+#define BL_REG_LIST()\
+	SR(LVTMA_PWRSEQ_CNTL), \
+	SR(LVTMA_PWRSEQ_STATE)
+
 #define HWSEQ_DCEF_REG_LIST_DCE8() \
 	.DCFE_CLOCK_CONTROL[0] = mmCRTC0_CRTC_DCFE_CLOCK_CONTROL, \
 	.DCFE_CLOCK_CONTROL[1] = mmCRTC1_CRTC_DCFE_CLOCK_CONTROL, \
@@ -86,24 +90,27 @@
 	SRII(BLND_CONTROL, BLND, 0),\
 	SRII(BLND_CONTROL, BLND, 1),\
 	SR(BLNDV_CONTROL),\
-	HWSEQ_PIXEL_RATE_REG_LIST(CRTC)
+	HWSEQ_PIXEL_RATE_REG_LIST(CRTC),\
+	BL_REG_LIST()
 
 #define HWSEQ_DCE8_REG_LIST() \
 	HWSEQ_DCEF_REG_LIST_DCE8(), \
 	HWSEQ_BLND_REG_LIST(), \
-	HWSEQ_PIXEL_RATE_REG_LIST(CRTC)
+	HWSEQ_PIXEL_RATE_REG_LIST(CRTC),\
+	BL_REG_LIST()
 
 #define HWSEQ_DCE10_REG_LIST() \
 	HWSEQ_DCEF_REG_LIST(), \
 	HWSEQ_BLND_REG_LIST(), \
-	HWSEQ_PIXEL_RATE_REG_LIST(CRTC)
+	HWSEQ_PIXEL_RATE_REG_LIST(CRTC), \
+	BL_REG_LIST()
 
 #define HWSEQ_ST_REG_LIST() \
 	HWSEQ_DCE11_REG_LIST_BASE(), \
 	.DCFE_CLOCK_CONTROL[2] = mmDCFEV_CLOCK_CONTROL, \
 	.CRTC_H_BLANK_START_END[2] = mmCRTCV_H_BLANK_START_END, \
 	.BLND_V_UPDATE_LOCK[2] = mmBLNDV_V_UPDATE_LOCK, \
-	.BLND_CONTROL[2] = mmBLNDV_CONTROL,
+	.BLND_CONTROL[2] = mmBLNDV_CONTROL
 
 #define HWSEQ_CZ_REG_LIST() \
 	HWSEQ_DCE11_REG_LIST_BASE(), \
@@ -123,12 +130,14 @@
 	SR(DCHUB_FB_LOCATION),\
 	SR(DCHUB_AGP_BASE),\
 	SR(DCHUB_AGP_BOT),\
-	SR(DCHUB_AGP_TOP)
+	SR(DCHUB_AGP_TOP), \
+	BL_REG_LIST()
 
 #define HWSEQ_DCE112_REG_LIST() \
 	HWSEQ_DCE10_REG_LIST(), \
 	HWSEQ_PIXEL_RATE_REG_LIST(CRTC), \
-	HWSEQ_PHYPLL_REG_LIST(CRTC)
+	HWSEQ_PHYPLL_REG_LIST(CRTC), \
+	BL_REG_LIST()
 
 #define HWSEQ_DCN_REG_LIST()\
 	SRII(OTG_GLOBAL_SYNC_STATUS, OTG, 0), \
@@ -228,9 +237,15 @@
 	SR(D2VGA_CONTROL), \
 	SR(D3VGA_CONTROL), \
 	SR(D4VGA_CONTROL), \
-	SR(DC_IP_REQUEST_CNTL)
+	SR(DC_IP_REQUEST_CNTL), \
+	BL_REG_LIST()
 
 struct dce_hwseq_registers {
+
+		/* Backlight registers */
+	uint32_t LVTMA_PWRSEQ_CNTL;
+	uint32_t LVTMA_PWRSEQ_STATE;
+
 	uint32_t DCFE_CLOCK_CONTROL[6];
 	uint32_t DCFEV_CLOCK_CONTROL;
 	uint32_t DC_MEM_GLOBAL_PWR_REQ_CNTL;
@@ -375,20 +390,24 @@ struct dce_hwseq_registers {
 	HWS_SF(BLND_, V_UPDATE_LOCK, BLND_SCL_V_UPDATE_LOCK, mask_sh),\
 	HWS_SF(BLND_, V_UPDATE_LOCK, BLND_DCP_GRPH_SURF_V_UPDATE_LOCK, mask_sh),\
 	HWS_SF(BLND_, CONTROL, BLND_MODE, mask_sh),\
+	HWS_SF(, LVTMA_PWRSEQ_CNTL, LVTMA_BLON, mask_sh),\
 	HWSEQ_PIXEL_RATE_MASK_SH_LIST(mask_sh, CRTC0_)
 
 #define HWSEQ_DCE10_MASK_SH_LIST(mask_sh)\
 	HWSEQ_DCEF_MASK_SH_LIST(mask_sh, DCFE_),\
 	HWSEQ_BLND_MASK_SH_LIST(mask_sh, BLND_),\
-	HWSEQ_PIXEL_RATE_MASK_SH_LIST(mask_sh, CRTC0_)
+	HWSEQ_PIXEL_RATE_MASK_SH_LIST(mask_sh, CRTC0_), \
+	HWS_SF(, LVTMA_PWRSEQ_CNTL, LVTMA_BLON, mask_sh)
 
 #define HWSEQ_DCE11_MASK_SH_LIST(mask_sh)\
 	HWSEQ_DCE10_MASK_SH_LIST(mask_sh),\
 	SF(DCFEV_CLOCK_CONTROL, DCFEV_CLOCK_ENABLE, mask_sh),\
+	HWS_SF(, LVTMA_PWRSEQ_CNTL, LVTMA_BLON, mask_sh),\
 	HWSEQ_PIXEL_RATE_MASK_SH_LIST(mask_sh, CRTC0_)
 
 #define HWSEQ_DCE112_MASK_SH_LIST(mask_sh)\
 	HWSEQ_DCE10_MASK_SH_LIST(mask_sh),\
+	HWS_SF(, LVTMA_PWRSEQ_CNTL, LVTMA_BLON, mask_sh),\
 	HWSEQ_PHYPLL_MASK_SH_LIST(mask_sh, CRTC0_)
 
 #define HWSEQ_GFX9_DCHUB_MASK_SH_LIST(mask_sh)\
@@ -396,14 +415,16 @@ struct dce_hwseq_registers {
 	SF(DCHUB_FB_LOCATION, FB_BASE, mask_sh),\
 	SF(DCHUB_AGP_BASE, AGP_BASE, mask_sh),\
 	SF(DCHUB_AGP_BOT, AGP_BOT, mask_sh),\
-	SF(DCHUB_AGP_TOP, AGP_TOP, mask_sh)
+	SF(DCHUB_AGP_TOP, AGP_TOP, mask_sh), \
+	HWS_SF(, LVTMA_PWRSEQ_CNTL, LVTMA_BLON, mask_sh)
 
 #define HWSEQ_DCE12_MASK_SH_LIST(mask_sh)\
 	HWSEQ_DCEF_MASK_SH_LIST(mask_sh, DCFE0_DCFE_),\
 	HWSEQ_BLND_MASK_SH_LIST(mask_sh, BLND0_BLND_),\
 	HWSEQ_PIXEL_RATE_MASK_SH_LIST(mask_sh, CRTC0_),\
 	HWSEQ_PHYPLL_MASK_SH_LIST(mask_sh, CRTC0_),\
-	HWSEQ_GFX9_DCHUB_MASK_SH_LIST(mask_sh)
+	HWSEQ_GFX9_DCHUB_MASK_SH_LIST(mask_sh), \
+	HWS_SF(, LVTMA_PWRSEQ_CNTL, LVTMA_BLON, mask_sh)
 
 #define HWSEQ_DCN_MASK_SH_LIST(mask_sh)\
 	HWSEQ_PIXEL_RATE_MASK_SH_LIST(mask_sh, OTG0_),\
@@ -467,7 +488,8 @@ struct dce_hwseq_registers {
 	HWS_SF(, DOMAIN5_PG_STATUS, DOMAIN5_PGFSM_PWR_STATUS, mask_sh), \
 	HWS_SF(, DOMAIN6_PG_STATUS, DOMAIN6_PGFSM_PWR_STATUS, mask_sh), \
 	HWS_SF(, DOMAIN7_PG_STATUS, DOMAIN7_PGFSM_PWR_STATUS, mask_sh), \
-	HWS_SF(, DC_IP_REQUEST_CNTL, IP_REQUEST_EN, mask_sh)
+	HWS_SF(, DC_IP_REQUEST_CNTL, IP_REQUEST_EN, mask_sh), \
+	HWS_SF(, LVTMA_PWRSEQ_CNTL, LVTMA_BLON, mask_sh)
 
 #define HWSEQ_REG_FIELD_LIST(type) \
 	type DCFE_CLOCK_ENABLE; \
@@ -497,7 +519,8 @@ struct dce_hwseq_registers {
 	type PHYSICAL_PAGE_NUMBER_LSB;\
 	type LOGICAL_ADDR; \
 	type ENABLE_L1_TLB;\
-	type SYSTEM_ACCESS_MODE;
+	type SYSTEM_ACCESS_MODE;\
+	type LVTMA_BLON;
 
 #define HWSEQ_DCN_REG_FIELD_LIST(type) \
 	type VUPDATE_NO_LOCK_EVENT_CLEAR; \
diff --git a/drivers/gpu/drm/amd/display/dc/dce/dce_link_encoder.c b/drivers/gpu/drm/amd/display/dc/dce/dce_link_encoder.c
index 37aeddf..1cb727b 100644
--- a/drivers/gpu/drm/amd/display/dc/dce/dce_link_encoder.c
+++ b/drivers/gpu/drm/amd/display/dc/dce/dce_link_encoder.c
@@ -122,7 +122,6 @@ static const struct link_encoder_funcs dce110_lnk_enc_funcs = {
 	.psr_program_dp_dphy_fast_training =
 			dce110_psr_program_dp_dphy_fast_training,
 	.psr_program_secondary_packet = dce110_psr_program_secondary_packet,
-	.backlight_control = dce110_link_encoder_edp_backlight_control,
 	.power_control = dce110_link_encoder_edp_power_control,
 	.connect_dig_be_to_fe = dce110_link_encoder_connect_dig_be_to_fe,
 	.enable_hpd = dce110_link_encoder_enable_hpd,
@@ -674,16 +673,6 @@ static void aux_initialize(
 
 }
 
-/*todo: cloned in stream enc, fix*/
-static bool is_panel_backlight_on(struct dce110_link_encoder *enc110)
-{
-	uint32_t value;
-
-	REG_GET(LVTMA_PWRSEQ_CNTL, LVTMA_BLON, &value);
-
-	return value;
-}
-
 void dce110_psr_program_dp_dphy_fast_training(struct link_encoder *enc,
 			bool exit_link_training_required)
 {
@@ -718,69 +707,6 @@ void dce110_psr_program_secondary_packet(struct link_encoder *enc,
 		DP_SEC_GSP0_PRIORITY, 1);
 }
 
-/*todo: cloned in stream enc, fix*/
-/*
- * @brief
- * eDP only. Control the backlight of the eDP panel
- */
-void dce110_link_encoder_edp_backlight_control(
-	struct link_encoder *enc,
-	bool enable)
-{
-	struct dce110_link_encoder *enc110 = TO_DCE110_LINK_ENC(enc);
-	struct dc_context *ctx = enc110->base.ctx;
-	struct bp_transmitter_control cntl = { 0 };
-
-	if (dal_graphics_object_id_get_connector_id(enc110->base.connector)
-		!= CONNECTOR_ID_EDP) {
-		BREAK_TO_DEBUGGER();
-		return;
-	}
-
-	if (enable && is_panel_backlight_on(enc110)) {
-		dm_logger_write(ctx->logger, LOG_HW_RESUME_S3,
-				"%s: panel already powered up. Do nothing.\n",
-				__func__);
-		return;
-	}
-
-	if (!enable && !is_panel_backlight_on(enc110)) {
-		dm_logger_write(ctx->logger, LOG_HW_RESUME_S3,
-				"%s: panel already powered down. Do nothing.\n",
-				__func__);
-		return;
-	}
-
-	/* Send VBIOS command to control eDP panel backlight */
-
-	dm_logger_write(ctx->logger, LOG_HW_RESUME_S3,
-			"%s: backlight action: %s\n",
-			__func__, (enable ? "On":"Off"));
-
-	cntl.action = enable ?
-		TRANSMITTER_CONTROL_BACKLIGHT_ON :
-		TRANSMITTER_CONTROL_BACKLIGHT_OFF;
-	/*cntl.engine_id = ctx->engine;*/
-	cntl.transmitter = enc110->base.transmitter;
-	cntl.connector_obj_id = enc110->base.connector;
-	/*todo: unhardcode*/
-	cntl.lanes_number = LANE_COUNT_FOUR;
-	cntl.hpd_sel = enc110->base.hpd_source;
-
-	/* For eDP, the following delays might need to be considered
-	 * after link training completed:
-	 * idle period - min. accounts for required BS-Idle pattern,
-	 * max. allows for source frame synchronization);
-	 * 50 msec max. delay from valid video data from source
-	 * to video on dislpay or backlight enable.
-	 *
-	 * Disable the delay for now.
-	 * Enable it in the future if necessary.
-	 */
-	/* dc_service_sleep_in_milliseconds(50); */
-	link_transmitter_control(enc110, &cntl);
-}
-
 static bool is_dig_enabled(const struct dce110_link_encoder *enc110)
 {
 	uint32_t value;
@@ -1279,7 +1205,8 @@ void dce110_link_encoder_enable_dp_mst_output(
  */
 void dce110_link_encoder_disable_output(
 	struct link_encoder *enc,
-	enum signal_type signal)
+	enum signal_type signal,
+	struct dc_link *link)
 {
 	struct dce110_link_encoder *enc110 = TO_DCE110_LINK_ENC(enc);
 	struct dc_context *ctx = enc110->base.ctx;
@@ -1291,7 +1218,7 @@ void dce110_link_encoder_disable_output(
 		return;
 	}
 	if (enc110->base.connector.id == CONNECTOR_ID_EDP)
-		dce110_link_encoder_edp_backlight_control(enc, false);
+		ctx->dc->hwss.backlight_control(link, false);
 	/* Power-down RX and disable GPU PHY should be paired.
 	 * Disabling PHY without powering down RX may cause
 	 * symbol lock loss, on which we will get DP Sink interrupt. */
diff --git a/drivers/gpu/drm/amd/display/dc/dce/dce_link_encoder.h b/drivers/gpu/drm/amd/display/dc/dce/dce_link_encoder.h
index 05463df..c65def5 100644
--- a/drivers/gpu/drm/amd/display/dc/dce/dce_link_encoder.h
+++ b/drivers/gpu/drm/amd/display/dc/dce/dce_link_encoder.h
@@ -69,10 +69,6 @@
 	SRI(DP_DPHY_FAST_TRAINING, DP, id), \
 	SRI(DP_SEC_CNTL1, DP, id)
 
-#define LE_EDP_REG_LIST(id)\
-	SR(LVTMA_PWRSEQ_CNTL), \
-	SR(LVTMA_PWRSEQ_STATE)
-
 #define LE_COMMON_REG_LIST(id)\
 	LE_COMMON_REG_LIST_BASE(id), \
 	SRI(DP_DPHY_BS_SR_SWAP_CNTL, DP, id), \
@@ -81,38 +77,32 @@
 
 #define LE_DCE80_REG_LIST(id)\
 	SRI(DP_DPHY_INTERNAL_CTRL, DP, id), \
-	LE_COMMON_REG_LIST_BASE(id), \
-	LE_EDP_REG_LIST(id)
+	LE_COMMON_REG_LIST_BASE(id)
 
 #define LE_DCE100_REG_LIST(id)\
 	LE_COMMON_REG_LIST_BASE(id), \
 	SRI(DP_DPHY_BS_SR_SWAP_CNTL, DP, id), \
 	SRI(DP_DPHY_INTERNAL_CTRL, DP, id), \
-	SR(DCI_MEM_PWR_STATUS), \
-	LE_EDP_REG_LIST(id)
+	SR(DCI_MEM_PWR_STATUS)
 
 #define LE_DCE110_REG_LIST(id)\
 	LE_COMMON_REG_LIST_BASE(id), \
 	SRI(DP_DPHY_BS_SR_SWAP_CNTL, DP, id), \
 	SRI(DP_DPHY_INTERNAL_CTRL, DP, id), \
 	SRI(DP_DPHY_HBR2_PATTERN_CONTROL, DP, id), \
-	SR(DCI_MEM_PWR_STATUS), \
-	LE_EDP_REG_LIST(id)
+	SR(DCI_MEM_PWR_STATUS)
 
 #define LE_DCE120_REG_LIST(id)\
 	LE_COMMON_REG_LIST_BASE(id), \
 	SRI(DP_DPHY_BS_SR_SWAP_CNTL, DP, id), \
 	SRI(DP_DPHY_HBR2_PATTERN_CONTROL, DP, id), \
-	SR(DCI_MEM_PWR_STATUS), \
-	LE_EDP_REG_LIST(id)
+	SR(DCI_MEM_PWR_STATUS)
 
 #define LE_DCN10_REG_LIST(id)\
 	LE_COMMON_REG_LIST_BASE(id), \
 	SRI(DP_DPHY_BS_SR_SWAP_CNTL, DP, id), \
 	SRI(DP_DPHY_INTERNAL_CTRL, DP, id), \
-	SRI(DP_DPHY_HBR2_PATTERN_CONTROL, DP, id), \
-	SR(DMU_MEM_PWR_CNTL), \
-	LE_EDP_REG_LIST(id)
+	SRI(DP_DPHY_HBR2_PATTERN_CONTROL, DP, id)
 
 struct dce110_link_enc_aux_registers {
 	uint32_t AUX_CONTROL;
@@ -243,7 +233,8 @@ void dce110_link_encoder_enable_dp_mst_output(
 /* disable PHY output */
 void dce110_link_encoder_disable_output(
 	struct link_encoder *link_enc,
-	enum signal_type signal);
+	enum signal_type signal,
+	struct dc_link *link);
 
 /* set DP lane settings */
 void dce110_link_encoder_dp_set_lane_settings(
@@ -259,10 +250,6 @@ void dce110_link_encoder_update_mst_stream_allocation_table(
 	struct link_encoder *enc,
 	const struct link_mst_stream_allocation_table *table);
 
-void dce110_link_encoder_edp_backlight_control(
-	struct link_encoder *enc,
-	bool enable);
-
 void dce110_link_encoder_edp_power_control(
 	struct link_encoder *enc,
 	bool power_up);
diff --git a/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c b/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c
index 9060318..14269c4 100644
--- a/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c
+++ b/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c
@@ -56,6 +56,15 @@
 #include "dce/dce_11_0_sh_mask.h"
 #include "custom_float.h"
 
+#define CTX \
+	hws->ctx
+#define REG(reg)\
+	hws->regs->reg
+
+#undef FN
+#define FN(reg_name, field_name) \
+	hws->shifts->field_name, hws->masks->field_name
+
 struct dce110_hw_seq_reg_offsets {
 	uint32_t crtc;
 };
@@ -761,6 +770,92 @@ void dce110_enable_stream(struct pipe_ctx *pipe_ctx)
 
 }
 
+/*todo: cloned in stream enc, fix*/
+static bool is_panel_backlight_on(struct dce_hwseq *hws)
+{
+	uint32_t value;
+
+	REG_GET(LVTMA_PWRSEQ_CNTL, LVTMA_BLON, &value);
+
+	return value;
+}
+
+static enum bp_result link_transmitter_control(
+		struct dc_link *link,
+	struct bp_transmitter_control *cntl)
+{
+	enum bp_result result;
+	struct dc_bios *bp = link->dc->ctx->dc_bios;
+
+	result = bp->funcs->transmitter_control(bp, cntl);
+
+	return result;
+}
+
+
+/*todo: cloned in stream enc, fix*/
+/*
+ * @brief
+ * eDP only. Control the backlight of the eDP panel
+ */
+void hwss_blacklight_control(
+	struct dc_link *link,
+	bool enable)
+{
+	struct dce_hwseq *hws = link->dc->hwseq;
+	struct dc_context *ctx = link->dc->ctx;
+	struct bp_transmitter_control cntl = { 0 };
+
+	if (dal_graphics_object_id_get_connector_id(link->link_id)
+		!= CONNECTOR_ID_EDP) {
+		BREAK_TO_DEBUGGER();
+		return;
+	}
+
+	if (enable && is_panel_backlight_on(hws)) {
+		dm_logger_write(ctx->logger, LOG_HW_RESUME_S3,
+				"%s: panel already powered up. Do nothing.\n",
+				__func__);
+		return;
+	}
+
+	if (!enable && !is_panel_backlight_on(hws)) {
+		dm_logger_write(ctx->logger, LOG_HW_RESUME_S3,
+				"%s: panel already powered down. Do nothing.\n",
+				__func__);
+		return;
+	}
+
+	/* Send VBIOS command to control eDP panel backlight */
+
+	dm_logger_write(ctx->logger, LOG_HW_RESUME_S3,
+			"%s: backlight action: %s\n",
+			__func__, (enable ? "On":"Off"));
+
+	cntl.action = enable ?
+		TRANSMITTER_CONTROL_BACKLIGHT_ON :
+		TRANSMITTER_CONTROL_BACKLIGHT_OFF;
+	/*cntl.engine_id = ctx->engine;*/
+	cntl.transmitter = link->link_enc->transmitter;
+	cntl.connector_obj_id = link->link_enc->connector;
+	/*todo: unhardcode*/
+	cntl.lanes_number = LANE_COUNT_FOUR;
+	cntl.hpd_sel = link->link_enc->hpd_source;
+
+	/* For eDP, the following delays might need to be considered
+	 * after link training completed:
+	 * idle period - min. accounts for required BS-Idle pattern,
+	 * max. allows for source frame synchronization);
+	 * 50 msec max. delay from valid video data from source
+	 * to video on dislpay or backlight enable.
+	 *
+	 * Disable the delay for now.
+	 * Enable it in the future if necessary.
+	 */
+	/* dc_service_sleep_in_milliseconds(50); */
+	link_transmitter_control(link, &cntl);
+}
+
 void dce110_disable_stream(struct pipe_ctx *pipe_ctx)
 {
 	struct dc_stream_state *stream = pipe_ctx->stream;
@@ -798,7 +893,7 @@ void dce110_disable_stream(struct pipe_ctx *pipe_ctx)
 	/* blank at encoder level */
 	if (dc_is_dp_signal(pipe_ctx->stream->signal)) {
 		if (pipe_ctx->stream->sink->link->connector_signal == SIGNAL_TYPE_EDP)
-			link->link_enc->funcs->backlight_control(link->link_enc, false);
+			hwss_blacklight_control(link, false);
 		pipe_ctx->stream_res.stream_enc->funcs->dp_blank(pipe_ctx->stream_res.stream_enc);
 	}
 	link->link_enc->funcs->connect_dig_be_to_fe(
@@ -820,7 +915,7 @@ void dce110_unblank_stream(struct pipe_ctx *pipe_ctx,
 	params.link_settings.link_rate = link_settings->link_rate;
 	pipe_ctx->stream_res.stream_enc->funcs->dp_unblank(pipe_ctx->stream_res.stream_enc, &params);
 	if (link->connector_signal == SIGNAL_TYPE_EDP)
-			link->link_enc->funcs->backlight_control(link->link_enc, true);
+		hwss_blacklight_control(link, true);
 }
 
 
@@ -1179,7 +1274,7 @@ static void power_down_encoders(struct dc *dc)
 		}
 
 		dc->links[i]->link_enc->funcs->disable_output(
-				dc->links[i]->link_enc, signal);
+				dc->links[i]->link_enc, signal, dc->links[i]);
 	}
 }
 
@@ -2728,7 +2823,7 @@ static const struct hw_sequencer_funcs dce110_funcs = {
 	.wait_for_mpcc_disconnect = dce110_wait_for_mpcc_disconnect,
 	.ready_shared_resources = ready_shared_resources,
 	.optimize_shared_resources = optimize_shared_resources,
-
+	.backlight_control = hwss_blacklight_control
 };
 
 void dce110_hw_sequencer_construct(struct dc *dc)
diff --git a/drivers/gpu/drm/amd/display/dc/inc/hw/link_encoder.h b/drivers/gpu/drm/amd/display/dc/inc/hw/link_encoder.h
index 961bbcc..6cd6bc7d 100644
--- a/drivers/gpu/drm/amd/display/dc/inc/hw/link_encoder.h
+++ b/drivers/gpu/drm/amd/display/dc/inc/hw/link_encoder.h
@@ -111,7 +111,7 @@ struct link_encoder_funcs {
 		const struct dc_link_settings *link_settings,
 		enum clock_source_id clock_source);
 	void (*disable_output)(struct link_encoder *link_enc,
-		enum signal_type signal);
+		enum signal_type signal, struct dc_link *link);
 	void (*dp_set_lane_settings)(struct link_encoder *enc,
 		const struct link_training_settings *link_settings);
 	void (*dp_set_phy_pattern)(struct link_encoder *enc,
@@ -123,8 +123,6 @@ struct link_encoder_funcs {
 			bool exit_link_training_required);
 	void (*psr_program_secondary_packet)(struct link_encoder *enc,
 				unsigned int sdp_transmit_line_num_deadline);
-	void (*backlight_control) (struct link_encoder *enc,
-		bool enable);
 	void (*power_control) (struct link_encoder *enc,
 		bool power_up);
 	void (*connect_dig_be_to_fe)(struct link_encoder *enc,
diff --git a/drivers/gpu/drm/amd/display/dc/inc/hw_sequencer.h b/drivers/gpu/drm/amd/display/dc/inc/hw_sequencer.h
index 1fa2edc..210874f 100644
--- a/drivers/gpu/drm/amd/display/dc/inc/hw_sequencer.h
+++ b/drivers/gpu/drm/amd/display/dc/inc/hw_sequencer.h
@@ -176,6 +176,10 @@ struct hw_sequencer_funcs {
 
 	void (*ready_shared_resources)(struct dc *dc, struct dc_state *context);
 	void (*optimize_shared_resources)(struct dc *dc);
+
+	void (*backlight_control)(
+			struct dc_link *link,
+			bool enable);
 };
 
 void color_space_to_black_color(
diff --git a/drivers/gpu/drm/amd/display/dc/virtual/virtual_link_encoder.c b/drivers/gpu/drm/amd/display/dc/virtual/virtual_link_encoder.c
index db513ab..4f40534 100644
--- a/drivers/gpu/drm/amd/display/dc/virtual/virtual_link_encoder.c
+++ b/drivers/gpu/drm/amd/display/dc/virtual/virtual_link_encoder.c
@@ -58,7 +58,8 @@ static void virtual_link_encoder_enable_dp_mst_output(
 
 static void virtual_link_encoder_disable_output(
 	struct link_encoder *link_enc,
-	enum signal_type signal) {}
+	enum signal_type signal,
+	struct dc_link *link) {}
 
 static void virtual_link_encoder_dp_set_lane_settings(
 	struct link_encoder *enc,
@@ -72,10 +73,6 @@ static void virtual_link_encoder_update_mst_stream_allocation_table(
 	struct link_encoder *enc,
 	const struct link_mst_stream_allocation_table *table) {}
 
-static void virtual_link_encoder_edp_backlight_control(
-	struct link_encoder *enc,
-	bool enable) {}
-
 static void virtual_link_encoder_edp_power_control(
 	struct link_encoder *enc,
 	bool power_up) {}
@@ -105,7 +102,6 @@ static const struct link_encoder_funcs virtual_lnk_enc_funcs = {
 	.dp_set_phy_pattern = virtual_link_encoder_dp_set_phy_pattern,
 	.update_mst_stream_allocation_table =
 		virtual_link_encoder_update_mst_stream_allocation_table,
-	.backlight_control = virtual_link_encoder_edp_backlight_control,
 	.power_control = virtual_link_encoder_edp_power_control,
 	.connect_dig_be_to_fe = virtual_link_encoder_connect_dig_be_to_fe,
 	.destroy = virtual_link_encoder_destroy
-- 
2.7.4