[PATCH] drm/amdgpu: fix gfx VF FLR test fail on navi

[Deucher, Alexander]

Acked-by: Alex Deucher <alexander.deucher at amd.com>
________________________________
From: amd-gfx <amd-gfx-bounces at lists.freedesktop.org> on behalf of HaiJun Chang <HaiJun.Chang at amd.com>
Sent: Tuesday, October 29, 2019 5:18 AM
To: amd-gfx at lists.freedesktop.org <amd-gfx at lists.freedesktop.org>
Cc: Chang, HaiJun <HaiJun.Chang at amd.com>
Subject: [PATCH] drm/amdgpu: fix gfx VF FLR test fail on navi

Cp wptr in wb buffer is outdated after VF FLR.
The outdated wptr may cause cp to execute unexpected packets.
Reset cp wptr in wb buffer.

Signed-off-by: HaiJun Chang <HaiJun.Chang at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/gfx_v10_0.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/gfx_v10_0.c b/drivers/gpu/drm/amd/amdgpu/gfx_v10_0.c
index d126d66..13363f2 100644
--- a/drivers/gpu/drm/amd/amdgpu/gfx_v10_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gfx_v10_0.c
@@ -3107,6 +3107,7 @@ static int gfx_v10_0_gfx_init_queue(struct amdgpu_ring *ring)
                         memcpy(mqd, adev->gfx.me.mqd_backup[AMDGPU_MAX_GFX_RINGS], sizeof(*mqd));
                 /* reset the ring */
                 ring->wptr = 0;
+               adev->wb.wb[ring->wptr_offs] = 0;
                 amdgpu_ring_clear_ring(ring);
 #ifdef BRING_UP_DEBUG
                 mutex_lock(&adev->srbm_mutex);
--
2.7.4

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