[PATCH 1/4] drm/amdgpu: Unset baco dummy mode on nbio v7.9

[Lijo Lazar]

BACO dummy mode could be set under reset conditions and that affects
framebuffer access. Check If baco dummy mode is set, unset it if so.

Signed-off-by: Lijo Lazar <lijo.lazar at amd.com>
Signed-off-by: Le Ma <le.ma at amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang at amd.com>
Reviewed-by: Asad Kamal <asad.kamal at amd.com>
Tested-by: Asad Kamal <asad.kamal at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/nbio_v7_9.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/nbio_v7_9.c b/drivers/gpu/drm/amd/amdgpu/nbio_v7_9.c
index 9ea072374cb7..f85eec05d218 100644
--- a/drivers/gpu/drm/amd/amdgpu/nbio_v7_9.c
+++ b/drivers/gpu/drm/amd/amdgpu/nbio_v7_9.c
@@ -437,6 +437,24 @@ static void nbio_v7_9_init_registers(struct amdgpu_device *adev)
 			XCC_DOORBELL_FENCE__SHUB_SLV_MODE_MASK);
 
 	}
+
+	if (!amdgpu_sriov_vf(adev)) {
+		u32 baco_cntl;
+		for_each_inst(i, adev->aid_mask) {
+			baco_cntl = RREG32_SOC15(NBIO, i, regBIF_BX0_BACO_CNTL);
+			if (baco_cntl & (BIF_BX0_BACO_CNTL__BACO_DUMMY_EN_MASK |
+					 BIF_BX0_BACO_CNTL__BACO_EN_MASK)) {
+				baco_cntl &= ~(
+					BIF_BX0_BACO_CNTL__BACO_DUMMY_EN_MASK |
+					BIF_BX0_BACO_CNTL__BACO_EN_MASK);
+				dev_dbg(adev->dev,
+					"Unsetting baco dummy mode %x",
+					baco_cntl);
+				WREG32_SOC15(NBIO, i, regBIF_BX0_BACO_CNTL,
+					     baco_cntl);
+			}
+		}
+	}
 }
 
 static u64 nbio_v7_9_get_pcie_replay_count(struct amdgpu_device *adev)
-- 
2.25.1