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

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

[How]
1. Set ODM_MEM_UNASSIGNED_PWR_MODE to shutdown memory when unassigned
2. Set ODM_MEM_VBLANK_PWR_MODE to light sleep mode when in vblank
3. Added a debug option to allow this behaviour to be turned off
4. Restructured debug options to use a bitfield in a way that's more clear

Signed-off-by: Jacky Liao <ziyu.liao@amd.com>
Reviewed-by: Eric Yang <eric.yang2@amd.com>
Acked-by: Qingqing Zhuo <qingqing.zhuo@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -414,6 +414,14 @@ struct dc_bw_validation_profile {
 			} \
 		}
 
+union mem_low_power_enable_options {
+	struct {
+		bool mpc: 1;
+		bool optc: 1;
+	} bits;
+	uint32_t u32All;
+};
+
 struct dc_debug_options {
 	enum visual_confirm visual_confirm;
 	bool sanity_checks;
@@ -506,7 +514,7 @@ struct dc_debug_options {
 	bool disable_dsc;
 	bool enable_dram_clock_change_one_display_vactive;
 	bool force_ignore_link_settings;
-	bool enable_mpc_mem_powerdown: 1;
+	union mem_low_power_enable_options enable_mem_low_power;
 };
 
 struct dc_debug_data {

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

@@ -607,6 +607,10 @@ struct dce_hwseq_registers {
 	uint32_t MC_VM_XGMI_LFB_CNTL;
 	uint32_t AZALIA_AUDIO_DTO;
 	uint32_t AZALIA_CONTROLLER_CLOCK_GATING;
+ #if defined(CONFIG_DRM_AMD_DC_DCN3_0)
+	uint32_t HPO_TOP_CLOCK_CONTROL;
+	uint32_t ODM_MEM_PWR_CTRL3;
+ #endif
 };
  /* set field name */
 #define HWS_SF(blk_name, reg_name, field_name, post_fix)\
@@ -845,7 +849,9 @@ struct dce_hwseq_registers {
 #if defined(CONFIG_DRM_AMD_DC_DCN3_0)
 #define HWSEQ_DCN30_MASK_SH_LIST(mask_sh)\
 	HWSEQ_DCN2_MASK_SH_LIST(mask_sh), \
-	HWS_SF(, AZALIA_AUDIO_DTO, AZALIA_AUDIO_DTO_MODULE, mask_sh)
+	HWS_SF(, AZALIA_AUDIO_DTO, AZALIA_AUDIO_DTO_MODULE, mask_sh), \
+	HWS_SF(, ODM_MEM_PWR_CTRL3, ODM_MEM_UNASSIGNED_PWR_MODE, mask_sh), \
+	HWS_SF(, ODM_MEM_PWR_CTRL3, ODM_MEM_VBLANK_PWR_MODE, mask_sh)
 #endif
 
 #if defined(CONFIG_DRM_AMD_DC_DCN3_01)
@@ -1059,7 +1065,9 @@ struct dce_hwseq_registers {
 	type D2VGA_MODE_ENABLE; \
 	type D3VGA_MODE_ENABLE; \
 	type D4VGA_MODE_ENABLE; \
-	type AZALIA_AUDIO_DTO_MODULE;
+	type AZALIA_AUDIO_DTO_MODULE; \
+	type ODM_MEM_UNASSIGNED_PWR_MODE; \
+	type ODM_MEM_VBLANK_PWR_MODE;
 
 #if defined(CONFIG_DRM_AMD_DC_DCN3_0)
 #define HWSEQ_DCN3_REG_FIELD_LIST(type) \

drivers/gpu/drm/amd/display/dc/dcn30/dcn30_hwseq.c

@@ -462,6 +462,12 @@ void dcn30_init_hw(struct dc *dc)
 		hws->funcs.disable_vga(dc->hwseq);
 	}
 
+	// Set default OPTC memory power states
+	if (dc->debug.enable_mem_low_power.bits.optc) {
+		// Shutdown when unassigned and light sleep in VBLANK
+		REG_SET_2(ODM_MEM_PWR_CTRL3, 0, ODM_MEM_UNASSIGNED_PWR_MODE, 3, ODM_MEM_VBLANK_PWR_MODE, 1);
+	}
+
 	if (dc->ctx->dc_bios->fw_info_valid) {
 		res_pool->ref_clocks.xtalin_clock_inKhz =
 				dc->ctx->dc_bios->fw_info.pll_info.crystal_frequency;

drivers/gpu/drm/amd/display/dc/dcn30/dcn30_mpc.c

@@ -143,7 +143,7 @@ static void mpc3_power_on_ogam_lut(
 {
 	struct dcn30_mpc *mpc30 = TO_DCN30_MPC(mpc);
 
-	if (mpc->ctx->dc->debug.enable_mpc_mem_powerdown) {
+	if (mpc->ctx->dc->debug.enable_mem_low_power.bits.mpc) {
 		// Force power on
 		REG_UPDATE(MPCC_MEM_PWR_CTRL[mpcc_id], MPCC_OGAM_MEM_PWR_DIS, power_on == true ? 1:0);
 		// Wait for confirmation when powering on
@@ -369,7 +369,7 @@ void mpc3_set_output_gamma(
 	REG_UPDATE(MPCC_OGAM_CONTROL[mpcc_id],
 			MPCC_OGAM_SELECT, next_mode == LUT_RAM_A ? 0:1);
 
-	if (mpc->ctx->dc->debug.enable_mpc_mem_powerdown)
+	if (mpc->ctx->dc->debug.enable_mem_low_power.bits.mpc)
 		mpc3_power_on_ogam_lut(mpc, mpcc_id, false);
 }
 
@@ -818,7 +818,7 @@ static void mpc3_power_on_shaper_3dlut(
 		REG_SET(MPC_RMU_MEM_PWR_CTRL, 0,
 			MPC_RMU0_MEM_PWR_DIS, power_on == true ? 1:0);
 		/* wait for memory to fully power up */
-		if (power_on && mpc->ctx->dc->debug.enable_mpc_mem_powerdown) {
+		if (power_on && mpc->ctx->dc->debug.enable_mem_low_power.bits.mpc) {
 			REG_WAIT(MPC_RMU_MEM_PWR_CTRL, MPC_RMU0_SHAPER_MEM_PWR_STATE, 0, 1, max_retries);
 			REG_WAIT(MPC_RMU_MEM_PWR_CTRL, MPC_RMU0_3DLUT_MEM_PWR_STATE, 0, 1, max_retries);
 		}
@@ -829,7 +829,7 @@ static void mpc3_power_on_shaper_3dlut(
 	} else if (rmu_idx == 1) {
 		REG_SET(MPC_RMU_MEM_PWR_CTRL, 0,
 			MPC_RMU1_MEM_PWR_DIS, power_on == true ? 1:0);
-		if (power_on && mpc->ctx->dc->debug.enable_mpc_mem_powerdown) {
+		if (power_on && mpc->ctx->dc->debug.enable_mem_low_power.bits.mpc) {
 			REG_WAIT(MPC_RMU_MEM_PWR_CTRL, MPC_RMU1_SHAPER_MEM_PWR_STATE, 0, 1, max_retries);
 			REG_WAIT(MPC_RMU_MEM_PWR_CTRL, MPC_RMU1_3DLUT_MEM_PWR_STATE, 0, 1, max_retries);
 		}
@@ -862,7 +862,7 @@ bool mpc3_program_shaper(
 		return false;
 	}
 
-	if (mpc->ctx->dc->debug.enable_mpc_mem_powerdown)
+	if (mpc->ctx->dc->debug.enable_mem_low_power.bits.mpc)
 		mpc3_power_on_shaper_3dlut(mpc, rmu_idx, true);
 
 	current_mode = mpc3_get_shaper_current(mpc, rmu_idx);
@@ -1223,7 +1223,7 @@ bool mpc3_program_3dlut(
 	mpc3_set_3dlut_mode(mpc, mode, is_12bits_color_channel,
 					is_17x17x17, rmu_idx);
 
-	if (mpc->ctx->dc->debug.enable_mpc_mem_powerdown)
+	if (mpc->ctx->dc->debug.enable_mem_low_power.bits.mpc)
 		mpc3_power_on_shaper_3dlut(mpc, rmu_idx, false);
 
 	return true;
@@ -1386,7 +1386,7 @@ static void mpc3_mpc_init(struct mpc *mpc)
 
 	mpc1_mpc_init(mpc);
 
-	if (mpc->ctx->dc->debug.enable_mpc_mem_powerdown) {
+	if (mpc->ctx->dc->debug.enable_mem_low_power.bits.mpc) {
 		if (mpc30->mpc_mask->MPC_RMU0_MEM_LOW_PWR_MODE && mpc30->mpc_mask->MPC_RMU1_MEM_LOW_PWR_MODE) {
 			REG_UPDATE(MPC_RMU_MEM_PWR_CTRL, MPC_RMU0_MEM_LOW_PWR_MODE, 3);
 			REG_UPDATE(MPC_RMU_MEM_PWR_CTRL, MPC_RMU1_MEM_LOW_PWR_MODE, 3);