drm/amdgpu: Allow switching to CUSTOM profile on Vega10 v2

Don't return an error if the CUSTOM profile is selected, just apply it
with the values saved to the GPU. But ensure that we zero out the
copy stored in adev to ensure that a valid profile has been submitted at
some point first

v2: Fix comment that wasn't updated from previous patch
Signed-off-by: Kent Russell <kent.russell@amd.com>
Reviewed-by: Evan Quan <evan.quan@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/powerplay/hwmgr/vega10_hwmgr.c

@@ -1427,6 +1427,15 @@ static int vega10_setup_default_dpm_tables(struct pp_hwmgr *hwmgr)
 
 	vega10_setup_default_pcie_table(hwmgr);
 
+	/* Zero out the saved copy of the CUSTOM profile
+	 * This will be checked when trying to set the profile
+	 * and will require that new values be passed in
+	 */
+	data->custom_profile_mode[0] = 0;
+	data->custom_profile_mode[1] = 0;
+	data->custom_profile_mode[2] = 0;
+	data->custom_profile_mode[3] = 0;
+
 	/* save a copy of the default DPM table */
 	memcpy(&(data->golden_dpm_table), &(data->dpm_table),
 			sizeof(struct vega10_dpm_table));
@@ -4910,9 +4919,20 @@ static int vega10_set_power_profile_mode(struct pp_hwmgr *hwmgr, long *input, ui
 						1 << power_profile_mode);
 
 	if (power_profile_mode == PP_SMC_POWER_PROFILE_CUSTOM) {
-		if (size == 0 || size > 4)
+		if (size != 0 && size != 4)
 			return -EINVAL;
 
+		/* If size = 0 and the CUSTOM profile has been set already
+		 * then just apply the profile. The copy stored in the hwmgr
+		 * is zeroed out on init
+		 */
+		if (size == 0) {
+			if (data->custom_profile_mode[0] != 0)
+				goto out;
+			else
+				return -EINVAL;
+		}
+
 		data->custom_profile_mode[0] = busy_set_point = input[0];
 		data->custom_profile_mode[1] = FPS = input[1];
 		data->custom_profile_mode[2] = use_rlc_busy = input[2];
@@ -4923,6 +4943,7 @@ static int vega10_set_power_profile_mode(struct pp_hwmgr *hwmgr, long *input, ui
 					use_rlc_busy << 16 | min_active_level<<24);
 	}
 
+out:
 	hwmgr->power_profile_mode = power_profile_mode;
 
 	return 0;