drm/amd: Fix initialization mistake for NBIO 7.7.0

There is a strapping issue on NBIO 7.7.0 that can lead to spurious PME
events while in the D0 state.

Co-developed-by: Mario Limonciello <[email protected]>
Signed-off-by: Vijendar Mukunda <[email protected]>
Signed-off-by: Mario Limonciello <[email protected]>
Acked-by: Alex Deucher <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Alex Deucher <[email protected]>
(cherry picked from commit 447a54a)
Cc: [email protected]

Author: vijendarmukunda

drivers/gpu/drm/amd/amdgpu/nbio_v7_7.c

@@ -247,6 +247,12 @@ static void nbio_v7_7_init_registers(struct amdgpu_device *adev)
 	if (def != data)
 		WREG32_SOC15(NBIO, 0, regBIF0_PCIE_MST_CTRL_3, data);
 
+	switch (adev->ip_versions[NBIO_HWIP][0]) {
+	case IP_VERSION(7, 7, 0):
+		data = RREG32_SOC15(NBIO, 0, regRCC_DEV0_EPF5_STRAP4) & ~BIT(23);
+		WREG32_SOC15(NBIO, 0, regRCC_DEV0_EPF5_STRAP4, data);
+		break;
+	}
 }
 
 static void nbio_v7_7_update_medium_grain_clock_gating(struct amdgpu_device *adev,