drm/amd/display: Add DSCL memory low power support

[Why]
The DSCL memory blocks should be powered down when they're not in use.
This will reduce power consumption.

[How]
1. Write to DSCL_MEM_PWR_FORCE to put memory to shutdown when DSCL is not
   used.
2. Added a debug option to allow this behaviour to be turned off
Signed-off-by: Jacky Liao <ziyu.liao@amd.com>
Reviewed-by: Eric Yang <eric.yang2@amd.com>
Acked-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -422,6 +422,7 @@ union mem_low_power_enable_options {
 	struct {
 		bool i2c: 1;
 		bool dmcu: 1;
+		bool dscl: 1;
 		bool cm: 1;
 		bool mpc: 1;
 		bool optc: 1;

drivers/gpu/drm/amd/display/dc/dcn10/dcn10_dpp.h

@@ -51,6 +51,8 @@
 	SRI(CM_GAMUT_REMAP_C33_C34, CM, id),\
 	SRI(DSCL_EXT_OVERSCAN_LEFT_RIGHT, DSCL, id), \
 	SRI(DSCL_EXT_OVERSCAN_TOP_BOTTOM, DSCL, id), \
+	SRI(DSCL_MEM_PWR_STATUS, DSCL, id), \
+	SRI(DSCL_MEM_PWR_CTRL, DSCL, id), \
 	SRI(OTG_H_BLANK, DSCL, id), \
 	SRI(OTG_V_BLANK, DSCL, id), \
 	SRI(SCL_MODE, DSCL, id), \
@@ -252,6 +254,8 @@
 	TF_SF(DSCL0_SCL_VERT_FILTER_INIT_BOT_C, SCL_V_INIT_INT_BOT_C, mask_sh),\
 	TF_SF(DSCL0_SCL_MODE, SCL_CHROMA_COEF_MODE, mask_sh),\
 	TF_SF(DSCL0_SCL_MODE, SCL_COEF_RAM_SELECT_CURRENT, mask_sh), \
+	TF_SF(DSCL0_DSCL_MEM_PWR_CTRL, LUT_MEM_PWR_FORCE, mask_sh), \
+	TF_SF(DSCL0_DSCL_MEM_PWR_STATUS, LUT_MEM_PWR_STATE, mask_sh), \
 	TF_SF(CM0_CM_ICSC_CONTROL, CM_ICSC_MODE, mask_sh), \
 	TF_SF(CM0_CM_ICSC_C11_C12, CM_ICSC_C11, mask_sh), \
 	TF_SF(CM0_CM_ICSC_C11_C12, CM_ICSC_C12, mask_sh), \
@@ -536,6 +540,8 @@
 	type SCL_V_INIT_INT_BOT_C; \
 	type SCL_CHROMA_COEF_MODE; \
 	type SCL_COEF_RAM_SELECT_CURRENT; \
+	type LUT_MEM_PWR_FORCE; \
+	type LUT_MEM_PWR_STATE; \
 	type CM_GAMUT_REMAP_MODE; \
 	type CM_GAMUT_REMAP_C11; \
 	type CM_GAMUT_REMAP_C12; \
@@ -1096,6 +1102,8 @@ struct dcn_dpp_mask {
 	uint32_t DSCL_EXT_OVERSCAN_TOP_BOTTOM; \
 	uint32_t OTG_H_BLANK; \
 	uint32_t OTG_V_BLANK; \
+	uint32_t DSCL_MEM_PWR_CTRL; \
+	uint32_t DSCL_MEM_PWR_STATUS; \
 	uint32_t SCL_MODE; \
 	uint32_t LB_DATA_FORMAT; \
 	uint32_t LB_MEMORY_CTRL; \

drivers/gpu/drm/amd/display/dc/dcn10/dcn10_dpp_dscl.c

@@ -198,6 +198,20 @@ static enum dscl_mode_sel dpp1_dscl_get_dscl_mode(
 	return DSCL_MODE_SCALING_420_YCBCR_ENABLE;
 }
 
+static void dpp1_power_on_dscl(
+	struct dpp *dpp_base,
+	bool power_on)
+{
+	struct dcn10_dpp *dpp = TO_DCN10_DPP(dpp_base);
+
+	if (dpp->tf_regs->DSCL_MEM_PWR_CTRL) {
+		REG_UPDATE(DSCL_MEM_PWR_CTRL, LUT_MEM_PWR_FORCE, power_on ? 0 : 3);
+		if (power_on)
+			REG_WAIT(DSCL_MEM_PWR_STATUS, LUT_MEM_PWR_STATE, 0, 1, 5);
+	}
+}
+
+
 static void dpp1_dscl_set_lb(
 	struct dcn10_dpp *dpp,
 	const struct line_buffer_params *lb_params,
@@ -678,6 +692,11 @@ void dpp1_dscl_set_scaler_manual_scale(
 
 	dpp->scl_data = *scl_data;
 
+	if (dpp_base->ctx->dc->debug.enable_mem_low_power.bits.dscl) {
+		if (dscl_mode != DSCL_MODE_DSCL_BYPASS)
+			dpp1_power_on_dscl(dpp_base, true);
+	}
+
 	/* Autocal off */
 	REG_SET_3(DSCL_AUTOCAL, 0,
 		AUTOCAL_MODE, AUTOCAL_MODE_OFF,
@@ -697,8 +716,11 @@ void dpp1_dscl_set_scaler_manual_scale(
 	/* SCL mode */
 	REG_UPDATE(SCL_MODE, DSCL_MODE, dscl_mode);
 
-	if (dscl_mode == DSCL_MODE_DSCL_BYPASS)
+	if (dscl_mode == DSCL_MODE_DSCL_BYPASS) {
+		if (dpp_base->ctx->dc->debug.enable_mem_low_power.bits.dscl)
+			dpp1_power_on_dscl(dpp_base, false);
 		return;
+	}
 
 	/* LB */
 	lb_config =  dpp1_dscl_find_lb_memory_config(dpp, scl_data);

drivers/gpu/drm/amd/display/dc/dcn20/dcn20_dpp.h

@@ -632,8 +632,7 @@
 	type CUR0_PIX_INV_MODE; \
 	type CUR0_PIXEL_ALPHA_MOD_EN; \
 	type CUR0_ROM_EN;\
-	type OBUF_MEM_PWR_FORCE;\
-	type LUT_MEM_PWR_FORCE
+	type OBUF_MEM_PWR_FORCE
 
 
 struct dcn2_dpp_shift {
@@ -659,8 +658,7 @@ struct dcn2_dpp_mask {
 	uint32_t COLOR_KEYER_RED; \
 	uint32_t COLOR_KEYER_GREEN; \
 	uint32_t COLOR_KEYER_BLUE; \
-	uint32_t OBUF_MEM_PWR_CTRL; \
-	uint32_t DSCL_MEM_PWR_CTRL
+	uint32_t OBUF_MEM_PWR_CTRL
 
 #define DPP_DCN2_REG_VARIABLE_LIST_CM_APPEND \
 	uint32_t CM_GAMUT_REMAP_B_C11_C12; \

drivers/gpu/drm/amd/display/dc/dcn30/dcn30_dpp.h

@@ -163,6 +163,8 @@
 	SRI(CM_SHAPER_LUT_DATA, CM, id),\
 	SRI(CM_MEM_PWR_CTRL2, CM, id), \
 	SRI(CM_MEM_PWR_STATUS2, CM, id), \
+	SRI(DSCL_MEM_PWR_STATUS, DSCL, id), \
+	SRI(DSCL_MEM_PWR_CTRL, DSCL, id), \
 	SRI(CM_BLNDGAM_RAMA_START_SLOPE_CNTL_B, CM, id),\
 	SRI(CM_BLNDGAM_RAMA_START_SLOPE_CNTL_G, CM, id),\
 	SRI(CM_BLNDGAM_RAMA_START_SLOPE_CNTL_R, CM, id),\
@@ -342,7 +344,8 @@
 	TF_SF(CNVC_CUR0_CURSOR0_CONTROL, CUR0_PIXEL_ALPHA_MOD_EN, mask_sh), \
 	TF_SF(CNVC_CUR0_CURSOR0_CONTROL, CUR0_ROM_EN, mask_sh),\
 	TF_SF(DSCL0_OBUF_MEM_PWR_CTRL, OBUF_MEM_PWR_FORCE, mask_sh),\
-	TF_SF(DSCL0_DSCL_MEM_PWR_CTRL, LUT_MEM_PWR_FORCE, mask_sh)
+	TF_SF(DSCL0_DSCL_MEM_PWR_CTRL, LUT_MEM_PWR_FORCE, mask_sh),\
+	TF_SF(DSCL0_DSCL_MEM_PWR_STATUS, LUT_MEM_PWR_STATE, mask_sh)
 
 #define DPP_REG_LIST_SH_MASK_DCN30_UPDATED(mask_sh)\
 	TF_SF(CM0_CM_MEM_PWR_STATUS, BLNDGAM_MEM_PWR_STATE, mask_sh), \