drm/amd/pm: optimize the link width/speed retrieving V2

By using the information provided by PMFW when available.

V2: put those structures shared around SMU V11 ASICs in
    smu_v11_0.h
Signed-off-by: Evan Quan <evan.quan@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/pm/inc/smu_v11_0.h

@@ -58,6 +58,12 @@
 #define CTF_OFFSET_HOTSPOT		5
 #define CTF_OFFSET_MEM			5
 
+#define LINK_WIDTH_MAX			6
+#define LINK_SPEED_MAX			3
+
+static __maybe_unused uint8_t link_width[] = {0, 1, 2, 4, 8, 12, 16};
+static __maybe_unused uint8_t link_speed[] = {25, 50, 80, 160};
+
 static const
 struct smu_temperature_range __maybe_unused smu11_thermal_policy[] =
 {
@@ -275,11 +281,11 @@ int smu_v11_0_get_dpm_level_range(struct smu_context *smu,
 
 int smu_v11_0_get_current_pcie_link_width_level(struct smu_context *smu);
 
-int smu_v11_0_get_current_pcie_link_width(struct smu_context *smu);
+uint8_t smu_v11_0_get_current_pcie_link_width(struct smu_context *smu);
 
 int smu_v11_0_get_current_pcie_link_speed_level(struct smu_context *smu);
 
-int smu_v11_0_get_current_pcie_link_speed(struct smu_context *smu);
+uint8_t smu_v11_0_get_current_pcie_link_speed(struct smu_context *smu);
 
 int smu_v11_0_gfx_ulv_control(struct smu_context *smu,
 			      bool enablement);

drivers/gpu/drm/amd/pm/swsmu/smu11/navi10_ppt.c

@@ -2714,10 +2714,8 @@ static ssize_t navi10_get_gpu_metrics(struct smu_context *smu,
 
 	gpu_metrics->current_fan_speed = metrics.CurrFanSpeed;
 
-	gpu_metrics->pcie_link_width =
-			smu_v11_0_get_current_pcie_link_width(smu);
-	gpu_metrics->pcie_link_speed =
-			smu_v11_0_get_current_pcie_link_speed(smu);
+	gpu_metrics->pcie_link_width = metrics.PcieWidth;
+	gpu_metrics->pcie_link_speed = link_speed[metrics.PcieRate];
 
 	gpu_metrics->system_clock_counter = ktime_get_boottime_ns();
 
@@ -2854,10 +2852,8 @@ static ssize_t navi12_get_gpu_metrics(struct smu_context *smu,
 
 	gpu_metrics->current_fan_speed = metrics.CurrFanSpeed;
 
-	gpu_metrics->pcie_link_width =
-			smu_v11_0_get_current_pcie_link_width(smu);
-	gpu_metrics->pcie_link_speed =
-			smu_v11_0_get_current_pcie_link_speed(smu);
+	gpu_metrics->pcie_link_width = metrics.PcieWidth;
+	gpu_metrics->pcie_link_speed = link_speed[metrics.PcieRate];
 
 	gpu_metrics->system_clock_counter = ktime_get_boottime_ns();
 

drivers/gpu/drm/amd/pm/swsmu/smu11/sienna_cichlid_ppt.c

@@ -2953,6 +2953,8 @@ static ssize_t sienna_cichlid_get_gpu_metrics(struct smu_context *smu,
 	SmuMetricsExternal_t metrics_external;
 	SmuMetrics_t *metrics =
 		&(metrics_external.SmuMetrics);
+	struct amdgpu_device *adev = smu->adev;
+	uint32_t smu_version;
 	int ret = 0;
 
 	ret = smu_cmn_get_metrics_table(smu,
@@ -2999,10 +3001,20 @@ static ssize_t sienna_cichlid_get_gpu_metrics(struct smu_context *smu,
 
 	gpu_metrics->current_fan_speed = metrics->CurrFanSpeed;
 
-	gpu_metrics->pcie_link_width =
-			smu_v11_0_get_current_pcie_link_width(smu);
-	gpu_metrics->pcie_link_speed =
-			smu_v11_0_get_current_pcie_link_speed(smu);
+	ret = smu_cmn_get_smc_version(smu, NULL, &smu_version);
+	if (ret)
+		return ret;
+
+	if (((adev->asic_type == CHIP_SIENNA_CICHLID) && smu_version > 0x003A1E00) ||
+	      ((adev->asic_type == CHIP_NAVY_FLOUNDER) && smu_version > 0x00410400)) {
+		gpu_metrics->pcie_link_width = metrics->PcieWidth;
+		gpu_metrics->pcie_link_speed = link_speed[metrics->PcieRate];
+	} else {
+		gpu_metrics->pcie_link_width =
+				smu_v11_0_get_current_pcie_link_width(smu);
+		gpu_metrics->pcie_link_speed =
+				smu_v11_0_get_current_pcie_link_speed(smu);
+	}
 
 	gpu_metrics->system_clock_counter = ktime_get_boottime_ns();
 

drivers/gpu/drm/amd/pm/swsmu/smu11/smu_v11_0.c

@@ -68,9 +68,6 @@ MODULE_FIRMWARE("amdgpu/dimgrey_cavefish_smc.bin");
 
 #define SMU11_MODE1_RESET_WAIT_TIME_IN_MS 500  //500ms
 
-#define LINK_WIDTH_MAX				6
-#define LINK_SPEED_MAX				3
-
 #define smnPCIE_LC_LINK_WIDTH_CNTL		0x11140288
 #define PCIE_LC_LINK_WIDTH_CNTL__LC_LINK_WIDTH_RD_MASK 0x00000070L
 #define PCIE_LC_LINK_WIDTH_CNTL__LC_LINK_WIDTH_RD__SHIFT 0x4
@@ -81,9 +78,6 @@ MODULE_FIRMWARE("amdgpu/dimgrey_cavefish_smc.bin");
 #define mmTHM_BACO_CNTL_ARCT			0xA7
 #define mmTHM_BACO_CNTL_ARCT_BASE_IDX		0
 
-static int link_width[] = {0, 1, 2, 4, 8, 12, 16};
-static int link_speed[] = {25, 50, 80, 160};
-
 int smu_v11_0_init_microcode(struct smu_context *smu)
 {
 	struct amdgpu_device *adev = smu->adev;
@@ -2001,7 +1995,7 @@ int smu_v11_0_get_current_pcie_link_width_level(struct smu_context *smu)
 		>> PCIE_LC_LINK_WIDTH_CNTL__LC_LINK_WIDTH_RD__SHIFT;
 }
 
-int smu_v11_0_get_current_pcie_link_width(struct smu_context *smu)
+uint8_t smu_v11_0_get_current_pcie_link_width(struct smu_context *smu)
 {
 	uint32_t width_level;
 
@@ -2021,7 +2015,7 @@ int smu_v11_0_get_current_pcie_link_speed_level(struct smu_context *smu)
 		>> PCIE_LC_SPEED_CNTL__LC_CURRENT_DATA_RATE__SHIFT;
 }
 
-int smu_v11_0_get_current_pcie_link_speed(struct smu_context *smu)
+uint8_t smu_v11_0_get_current_pcie_link_speed(struct smu_context *smu)
 {
 	uint32_t speed_level;