drm/amd/pm: correct the fan speed RPM retrieving

The relationship "PWM = RPM / smu->fan_max_rpm" between fan speed
PWM and RPM is not true for SMU11 ASICs. So, we need a new way to
retrieving the fan speed RPM.
Signed-off-by: Evan Quan <evan.quan@amd.com>
Reviewed-by: Lijo Lazar <lijo.lazar@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/include/asic_reg/thm/thm_11_0_2_offset.h

@@ -38,6 +38,9 @@
 #define mmCG_TACH_CTRL                                                                                 0x006a
 #define mmCG_TACH_CTRL_BASE_IDX                                                                        0
 
+#define mmCG_TACH_STATUS                                                                               0x006b
+#define mmCG_TACH_STATUS_BASE_IDX                                                                      0
+
 #define mmTHM_THERMAL_INT_ENA                                                                          0x000a
 #define mmTHM_THERMAL_INT_ENA_BASE_IDX                                                                 0
 #define mmTHM_THERMAL_INT_CTRL                                                                         0x000b

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

@@ -729,6 +729,11 @@ struct pptable_funcs {
 	 */
 	int (*get_fan_speed_percent)(struct smu_context *smu, uint32_t *speed);
 
+	/**
+	 * @get_fan_speed_rpm: Get the current fan speed in rpm.
+	 */
+	int (*get_fan_speed_rpm)(struct smu_context *smu, uint32_t *speed);
+
 	/**
 	 * @set_watermarks_table: Configure and upload the watermarks tables to
 	 *                        the SMU.

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

@@ -230,6 +230,9 @@ int smu_v11_0_set_fan_speed_rpm(struct smu_context *smu,
 int smu_v11_0_get_fan_speed_percent(struct smu_context *smu,
 				    uint32_t *speed);
 
+int smu_v11_0_get_fan_speed_rpm(struct smu_context *smu,
+				uint32_t *speed);
+
 int smu_v11_0_set_xgmi_pstate(struct smu_context *smu,
 				     uint32_t pstate);
 

drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c

@@ -2639,17 +2639,14 @@ static int smu_get_fan_speed_rpm(void *handle, uint32_t *speed)
 {
 	struct smu_context *smu = handle;
 	int ret = 0;
-	u32 percent;
 
 	if (!smu->pm_enabled || !smu->adev->pm.dpm_enabled)
 		return -EOPNOTSUPP;
 
 	mutex_lock(&smu->mutex);
 
-	if (smu->ppt_funcs->get_fan_speed_percent) {
-		ret = smu->ppt_funcs->get_fan_speed_percent(smu, &percent);
-		*speed = percent * smu->fan_max_rpm / 100;
-	}
+	if (smu->ppt_funcs->get_fan_speed_rpm)
+		ret = smu->ppt_funcs->get_fan_speed_rpm(smu, speed);
 
 	mutex_unlock(&smu->mutex);
 

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

@@ -1162,6 +1162,29 @@ static int arcturus_read_sensor(struct smu_context *smu,
 	return ret;
 }
 
+static int arcturus_get_fan_speed_rpm(struct smu_context *smu,
+				      uint32_t *speed)
+{
+	int ret = 0;
+
+	if (!speed)
+		return -EINVAL;
+
+	switch (smu_v11_0_get_fan_control_mode(smu)) {
+	case AMD_FAN_CTRL_AUTO:
+		ret = arcturus_get_smu_metrics_data(smu,
+						    METRICS_CURR_FANSPEED,
+						    speed);
+		break;
+	default:
+		ret = smu_v11_0_get_fan_speed_rpm(smu,
+						  speed);
+		break;
+	}
+
+	return ret;
+}
+
 static int arcturus_get_fan_parameters(struct smu_context *smu)
 {
 	PPTable_t *pptable = smu->smu_table.driver_pptable;
@@ -2248,6 +2271,7 @@ static const struct pptable_funcs arcturus_ppt_funcs = {
 	.force_clk_levels = arcturus_force_clk_levels,
 	.read_sensor = arcturus_read_sensor,
 	.get_fan_speed_percent = smu_v11_0_get_fan_speed_percent,
+	.get_fan_speed_rpm = arcturus_get_fan_speed_rpm,
 	.get_power_profile_mode = arcturus_get_power_profile_mode,
 	.set_power_profile_mode = arcturus_set_power_profile_mode,
 	.set_performance_level = arcturus_set_performance_level,

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

@@ -1671,6 +1671,29 @@ static bool navi10_is_dpm_running(struct smu_context *smu)
 	return !!(feature_enabled & SMC_DPM_FEATURE);
 }
 
+static int navi10_get_fan_speed_rpm(struct smu_context *smu,
+				    uint32_t *speed)
+{
+	int ret = 0;
+
+	if (!speed)
+		return -EINVAL;
+
+	switch (smu_v11_0_get_fan_control_mode(smu)) {
+	case AMD_FAN_CTRL_AUTO:
+		ret = navi10_get_smu_metrics_data(smu,
+						  METRICS_CURR_FANSPEED,
+						  speed);
+		break;
+	default:
+		ret = smu_v11_0_get_fan_speed_rpm(smu,
+						  speed);
+		break;
+	}
+
+	return ret;
+}
+
 static int navi10_get_fan_parameters(struct smu_context *smu)
 {
 	PPTable_t *pptable = smu->smu_table.driver_pptable;
@@ -3205,6 +3228,7 @@ static const struct pptable_funcs navi10_ppt_funcs = {
 	.notify_smc_display_config = navi10_notify_smc_display_config,
 	.is_dpm_running = navi10_is_dpm_running,
 	.get_fan_speed_percent = smu_v11_0_get_fan_speed_percent,
+	.get_fan_speed_rpm = navi10_get_fan_speed_rpm,
 	.get_power_profile_mode = navi10_get_power_profile_mode,
 	.set_power_profile_mode = navi10_set_power_profile_mode,
 	.set_watermarks_table = navi10_set_watermarks_table,

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

@@ -1354,6 +1354,22 @@ static bool sienna_cichlid_is_dpm_running(struct smu_context *smu)
 	return !!(feature_enabled & SMC_DPM_FEATURE);
 }
 
+static int sienna_cichlid_get_fan_speed_rpm(struct smu_context *smu,
+					    uint32_t *speed)
+{
+	if (!speed)
+		return -EINVAL;
+
+	/*
+	 * For Sienna_Cichlid and later, the fan speed(rpm) reported
+	 * by pmfw is always trustable(even when the fan control feature
+	 * disabled or 0 RPM kicked in).
+	 */
+	return sienna_cichlid_get_smu_metrics_data(smu,
+						   METRICS_CURR_FANSPEED,
+						   speed);
+}
+
 static int sienna_cichlid_get_fan_parameters(struct smu_context *smu)
 {
 	uint16_t *table_member;
@@ -3837,6 +3853,7 @@ static const struct pptable_funcs sienna_cichlid_ppt_funcs = {
 	.notify_smc_display_config = sienna_cichlid_notify_smc_display_config,
 	.is_dpm_running = sienna_cichlid_is_dpm_running,
 	.get_fan_speed_percent = smu_v11_0_get_fan_speed_percent,
+	.get_fan_speed_rpm = sienna_cichlid_get_fan_speed_rpm,
 	.get_power_profile_mode = sienna_cichlid_get_power_profile_mode,
 	.set_power_profile_mode = sienna_cichlid_set_power_profile_mode,
 	.set_watermarks_table = sienna_cichlid_set_watermarks_table,

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

@@ -1298,6 +1298,34 @@ int smu_v11_0_get_fan_speed_percent(struct smu_context *smu,
 	return 0;
 }
 
+int smu_v11_0_get_fan_speed_rpm(struct smu_context *smu,
+				uint32_t *speed)
+{
+	struct amdgpu_device *adev = smu->adev;
+	uint32_t crystal_clock_freq = 2500;
+	uint32_t tach_status;
+	uint64_t tmp64;
+
+	/*
+	 * For pre Sienna Cichlid ASICs, the 0 RPM may be not correctly
+	 * detected via register retrieving. To workaround this, we will
+	 * report the fan speed as 0 RPM if user just requested such.
+	 */
+	if ((smu->user_dpm_profile.flags & SMU_CUSTOM_FAN_SPEED_RPM)
+	     && !smu->user_dpm_profile.fan_speed_rpm) {
+		*speed = 0;
+		return 0;
+	}
+
+	tmp64 = (uint64_t)crystal_clock_freq * 60 * 10000;
+
+	tach_status = RREG32_SOC15(THM, 0, mmCG_TACH_STATUS);
+	do_div(tmp64, tach_status);
+	*speed = (uint32_t)tmp64;
+
+	return 0;
+}
+
 int
 smu_v11_0_set_fan_control_mode(struct smu_context *smu,
 			       uint32_t mode)