drm/amd/powerplay: enable clock gating for Fiji.

BugLink: http://bugs.launchpad.net/bugs/1546572Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Jammy Zhou <Jammy.Zhou@amd.com>
Signed-off-by: Eric Huang <JinHuiEric.Huang@amd.com>
(cherry picked from commit 92b05d82)
Signed-off-by: Alberto Milone <alberto.milone@canonical.com>
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>

drivers/gpu/drm/amd/powerplay/smumgr/fiji_smumgr.c

@@ -917,7 +917,14 @@ static int fiji_start_smu(struct pp_smumgr *smumgr)
 	}
 
 	/* To initialize all clock gating before RLC loaded and running.*/
-	/*PECI_InitClockGating(peci);*/
+	cgs_set_clockgating_state(smumgr->device,
+			AMD_IP_BLOCK_TYPE_GFX, AMD_CG_STATE_GATE);
+	cgs_set_clockgating_state(smumgr->device,
+			AMD_IP_BLOCK_TYPE_GMC, AMD_CG_STATE_GATE);
+	cgs_set_clockgating_state(smumgr->device,
+			AMD_IP_BLOCK_TYPE_SDMA, AMD_CG_STATE_GATE);
+	cgs_set_clockgating_state(smumgr->device,
+			AMD_IP_BLOCK_TYPE_COMMON, AMD_CG_STATE_GATE);
 
 	/* Setup SoftRegsStart here for register lookup in case
 	 * DummyBackEnd is used and ProcessFirmwareHeader is not executed