[PATCH] drm/amdgpu: Disable sdma wptr polling memory for sriov

[Deucher, Alexander]

Acked-by: Alex Deucher <alexander.deucher at amd.com>

________________________________
From: amd-gfx <amd-gfx-bounces at lists.freedesktop.org> on behalf of Emily Deng <Emily.Deng at amd.com>
Sent: Monday, March 5, 2018 9:14 PM
To: amd-gfx at lists.freedesktop.org
Cc: Deng, Emily
Subject: [PATCH] drm/amdgpu: Disable sdma wptr polling memory for sriov

The sdma wptr polling memory will introduce serious issue sdma hang for
sriov environment on sdma v3.
And the sdma wptr polling memory is only to fix the FLR cornner case, the
issue's probabity is very low.

Change-Id: I2c447533aac6b16d541f58644d141228dd75dfb3
Signed-off-by: Emily Deng <Emily.Deng at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/sdma_v3_0.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/sdma_v3_0.c b/drivers/gpu/drm/amd/amdgpu/sdma_v3_0.c
index ec885ff..44d7d08 100644
--- a/drivers/gpu/drm/amd/amdgpu/sdma_v3_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/sdma_v3_0.c
@@ -716,10 +716,7 @@ static int sdma_v3_0_gfx_resume(struct amdgpu_device *adev)
                 WREG32(mmSDMA0_GFX_RB_WPTR_POLL_ADDR_HI + sdma_offsets[i],
                        upper_32_bits(wptr_gpu_addr));
                 wptr_poll_cntl = RREG32(mmSDMA0_GFX_RB_WPTR_POLL_CNTL + sdma_offsets[i]);
-               if (amdgpu_sriov_vf(adev))
-                       wptr_poll_cntl = REG_SET_FIELD(wptr_poll_cntl, SDMA0_GFX_RB_WPTR_POLL_CNTL, F32_POLL_ENABLE, 1);
-               else
-                       wptr_poll_cntl = REG_SET_FIELD(wptr_poll_cntl, SDMA0_GFX_RB_WPTR_POLL_CNTL, F32_POLL_ENABLE, 0);
+               wptr_poll_cntl = REG_SET_FIELD(wptr_poll_cntl, SDMA0_GFX_RB_WPTR_POLL_CNTL, F32_POLL_ENABLE, 0);
                 WREG32(mmSDMA0_GFX_RB_WPTR_POLL_CNTL + sdma_offsets[i], wptr_poll_cntl);

                 /* enable DMA RB */
--
2.7.4

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