drm/amd/powerplay: add Vega20 LCLK DPM level setting support

Support manual LCLK DPM level switch on Vega20.
Signed-off-by: Evan Quan <evan.quan@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Rex Zhu <Rex.Zhu@amd.com>
Reviewed-by: Feifei Xu <Feifei.Xu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/powerplay/hwmgr/vega20_hwmgr.c

@@ -49,6 +49,10 @@
 #include "soc15_common.h"
 #include "smuio/smuio_9_0_offset.h"
 #include "smuio/smuio_9_0_sh_mask.h"
+#include "nbio/nbio_7_4_sh_mask.h"
+
+#define smnPCIE_LC_SPEED_CNTL			0x11140290
+#define smnPCIE_LC_LINK_WIDTH_CNTL		0x11140288
 
 static void vega20_set_default_registry_data(struct pp_hwmgr *hwmgr)
 {
@@ -2272,6 +2276,18 @@ static int vega20_force_clock_level(struct pp_hwmgr *hwmgr,
 		break;
 
 	case PP_PCIE:
+		soft_min_level = mask ? (ffs(mask) - 1) : 0;
+		soft_max_level = mask ? (fls(mask) - 1) : 0;
+		if (soft_min_level >= NUM_LINK_LEVELS ||
+		    soft_max_level >= NUM_LINK_LEVELS)
+			return -EINVAL;
+
+		ret = smum_send_msg_to_smc_with_parameter(hwmgr,
+			PPSMC_MSG_SetMinLinkDpmByIndex, soft_min_level);
+		PP_ASSERT_WITH_CODE(!ret,
+			"Failed to set min link dpm level!",
+			return ret);
+
 		break;
 
 	default:
@@ -2748,9 +2764,14 @@ static int vega20_print_clock_levels(struct pp_hwmgr *hwmgr,
 			data->od8_settings.od8_settings_array;
 	OverDriveTable_t *od_table =
 			&(data->smc_state_table.overdrive_table);
+	struct phm_ppt_v3_information *pptable_information =
+		(struct phm_ppt_v3_information *)hwmgr->pptable;
+	PPTable_t *pptable = (PPTable_t *)pptable_information->smc_pptable;
+	struct amdgpu_device *adev = hwmgr->adev;
 	struct pp_clock_levels_with_latency clocks;
 	int i, now, size = 0;
 	int ret = 0;
+	uint32_t gen_speed, lane_width;
 
 	switch (type) {
 	case PP_SCLK:
@@ -2788,6 +2809,28 @@ static int vega20_print_clock_levels(struct pp_hwmgr *hwmgr,
 		break;
 
 	case PP_PCIE:
+		gen_speed = (RREG32_PCIE(smnPCIE_LC_SPEED_CNTL) &
+			     PSWUSP0_PCIE_LC_SPEED_CNTL__LC_CURRENT_DATA_RATE_MASK)
+			    >> PSWUSP0_PCIE_LC_SPEED_CNTL__LC_CURRENT_DATA_RATE__SHIFT;
+		lane_width = (RREG32_PCIE(smnPCIE_LC_LINK_WIDTH_CNTL) &
+			      PCIE_LC_LINK_WIDTH_CNTL__LC_LINK_WIDTH_RD_MASK)
+			    >> PCIE_LC_LINK_WIDTH_CNTL__LC_LINK_WIDTH_RD__SHIFT;
+		for (i = 0; i < NUM_LINK_LEVELS; i++)
+			size += sprintf(buf + size, "%d: %s %s %dMhz %s\n", i,
+					(pptable->PcieGenSpeed[i] == 0) ? "2.5GT/s," :
+					(pptable->PcieGenSpeed[i] == 1) ? "5.0GT/s," :
+					(pptable->PcieGenSpeed[i] == 2) ? "8.0GT/s," :
+					(pptable->PcieGenSpeed[i] == 3) ? "16.0GT/s," : "",
+					(pptable->PcieLaneCount[i] == 1) ? "x1" :
+					(pptable->PcieLaneCount[i] == 2) ? "x2" :
+					(pptable->PcieLaneCount[i] == 3) ? "x4" :
+					(pptable->PcieLaneCount[i] == 4) ? "x8" :
+					(pptable->PcieLaneCount[i] == 5) ? "x12" :
+					(pptable->PcieLaneCount[i] == 6) ? "x16" : "",
+					pptable->LclkFreq[i],
+					(gen_speed == pptable->PcieGenSpeed[i]) &&
+					(lane_width == pptable->PcieLaneCount[i]) ?
+					"*" : "");
 		break;
 
 	case OD_SCLK: