drm/amd/powerplay: export a function to read fan rpm

Powerplay hwmgr already has an implementation, all we need to do is to call it.
Signed-off-by: Grazvydas Ignotas <notasas@gmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -582,6 +582,23 @@ static int pp_dpm_get_fan_speed_percent(void *handle, uint32_t *speed)
 	return hwmgr->hwmgr_func->get_fan_speed_percent(hwmgr, speed);
 }
 
+static int pp_dpm_get_fan_speed_rpm(void *handle, uint32_t *rpm)
+{
+	struct pp_hwmgr *hwmgr;
+
+	if (handle == NULL)
+		return -EINVAL;
+
+	hwmgr = ((struct pp_instance *)handle)->hwmgr;
+
+	PP_CHECK_HW(hwmgr);
+
+	if (hwmgr->hwmgr_func->get_fan_speed_rpm == NULL)
+		return -EINVAL;
+
+	return hwmgr->hwmgr_func->get_fan_speed_rpm(hwmgr, rpm);
+}
+
 static int pp_dpm_get_temperature(void *handle)
 {
 	struct pp_hwmgr  *hwmgr;
@@ -852,6 +869,7 @@ const struct amd_powerplay_funcs pp_dpm_funcs = {
 	.get_fan_control_mode = pp_dpm_get_fan_control_mode,
 	.set_fan_speed_percent = pp_dpm_set_fan_speed_percent,
 	.get_fan_speed_percent = pp_dpm_get_fan_speed_percent,
+	.get_fan_speed_rpm = pp_dpm_get_fan_speed_rpm,
 	.get_pp_num_states = pp_dpm_get_pp_num_states,
 	.get_pp_table = pp_dpm_get_pp_table,
 	.set_pp_table = pp_dpm_set_pp_table,

drivers/gpu/drm/amd/powerplay/inc/amd_powerplay.h

@@ -349,6 +349,7 @@ struct amd_powerplay_funcs {
 	int (*get_fan_control_mode)(void *handle);
 	int (*set_fan_speed_percent)(void *handle, uint32_t percent);
 	int (*get_fan_speed_percent)(void *handle, uint32_t *speed);
+	int (*get_fan_speed_rpm)(void *handle, uint32_t *rpm);
 	int (*get_pp_num_states)(void *handle, struct pp_states_info *data);
 	int (*get_pp_table)(void *handle, char **table);
 	int (*set_pp_table)(void *handle, const char *buf, size_t size);