drm/amd/pm: Disable fan control if not supported

On arcturus, not all platforms use PMFW based fan control. On such
ASICs fan control by PMFW will be disabled in PPTable. Disable hwmon
knobs for fan control also as it is not possible to report or control
fan speed on such platforms through driver.

Signed-off-by: Lijo Lazar <lijo.lazar@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -436,13 +436,27 @@ static void arcturus_check_bxco_support(struct smu_context *smu)
 	}
 }
 
+static void arcturus_check_fan_support(struct smu_context *smu)
+{
+	struct smu_table_context *table_context = &smu->smu_table;
+	PPTable_t *pptable = table_context->driver_pptable;
+
+	/* No sort of fan control possible if PPTable has it disabled */
+	smu->adev->pm.no_fan =
+		!(pptable->FeaturesToRun[0] & FEATURE_FAN_CONTROL_MASK);
+	if (smu->adev->pm.no_fan)
+		dev_info_once(smu->adev->dev,
+			      "PMFW based fan control disabled");
+}
+
 static int arcturus_check_powerplay_table(struct smu_context *smu)
 {
 	struct smu_table_context *table_context = &smu->smu_table;
 	struct smu_11_0_powerplay_table *powerplay_table =
 		table_context->power_play_table;
 
 	arcturus_check_bxco_support(smu);
+	arcturus_check_fan_support(smu);
 
 	table_context->thermal_controller_type =
 		powerplay_table->thermal_controller_type;