[PATCH] drm/amd: Update strapping for NBIO 2.5.0

[Mario Limonciello]

This helps to avoid a spurious PME event on hotplug to Azalia.

Cc: Vijendar Mukunda <Vijendar.Mukunda at amd.com>
Reported-by: ionut_n2001 at yahoo.com
Closes: https://bugzilla.kernel.org/show_bug.cgi?id=215884
Tested-by: Gabriel Marcano <gabemarcano at yahoo.com>
Signed-off-by: Mario Limonciello <mario.limonciello at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/nbio_v7_0.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/nbio_v7_0.c b/drivers/gpu/drm/amd/amdgpu/nbio_v7_0.c
index b1b57dcc5a73..616b290c9381 100644
--- a/drivers/gpu/drm/amd/amdgpu/nbio_v7_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/nbio_v7_0.c
@@ -271,8 +271,20 @@ const struct nbio_hdp_flush_reg nbio_v7_0_hdp_flush_reg = {
 	.ref_and_mask_sdma1 = GPU_HDP_FLUSH_DONE__SDMA1_MASK,
 };
 
+#define regRCC_DEV0_EPF6_STRAP4                                                                         0xd304
+#define regRCC_DEV0_EPF6_STRAP4_BASE_IDX                                                                5
+
 static void nbio_v7_0_init_registers(struct amdgpu_device *adev)
 {
+	uint32_t data;
+
+	switch (adev->ip_versions[NBIO_HWIP][0]) {
+	case IP_VERSION(2, 5, 0):
+		data = RREG32_SOC15(NBIO, 0, regRCC_DEV0_EPF6_STRAP4) & ~BIT(23);
+		WREG32_SOC15(NBIO, 0, regRCC_DEV0_EPF6_STRAP4, data);
+		break;
+	}
+
 }
 
 #define MMIO_REG_HOLE_OFFSET (0x80000 - PAGE_SIZE)
-- 
2.34.1