drm/amd/powerplay: add function get_fan_speed_percent for navi10

add callback function get_fan_speed_percent for navi10 asic
Signed-off-by: Kevin Wang <kevin1.wang@amd.com>
Reviewed-by: Huang Rui <ray.huang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/powerplay/navi10_ppt.c

@@ -819,6 +819,24 @@ static int navi10_set_thermal_fan_table(struct smu_context *smu)
 	return ret;
 }
 
+static int navi10_get_fan_speed_percent(struct smu_context *smu,
+					uint32_t *speed)
+{
+	int ret = 0;
+	uint32_t percent = 0;
+	uint32_t current_rpm;
+	PPTable_t *pptable = smu->smu_table.driver_pptable;
+
+	ret = smu_get_current_rpm(smu, &current_rpm);
+	if (ret)
+		return ret;
+
+	percent = current_rpm * 100 / pptable->FanMaximumRpm;
+	*speed = percent > 100 ? 100 : percent;
+
+	return ret;
+}
+
 static const struct pptable_funcs navi10_ppt_funcs = {
 	.tables_init = navi10_tables_init,
 	.alloc_dpm_context = navi10_allocate_dpm_context,
@@ -846,6 +864,7 @@ static const struct pptable_funcs navi10_ppt_funcs = {
 	.get_current_activity_percent = navi10_get_current_activity_percent,
 	.is_dpm_running = navi10_is_dpm_running,
 	.set_thermal_fan_table = navi10_set_thermal_fan_table,
+	.get_fan_speed_percent = navi10_get_fan_speed_percent,
 };
 
 void navi10_set_ppt_funcs(struct smu_context *smu)