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From 3f342675d69b28118f84ecf90469545de2b486a0 Mon Sep 17 00:00:00 2001
From: HaiJun Chang <HaiJun.Chang@amd.com>
Date: Tue, 29 Oct 2019 15:44:08 +0800
Subject: [PATCH 4315/4736] 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Cp wptr in wb buffer is outdated after VF FLR.
The outdated wptr may cause cp to execute unexpected packets.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@amd.com>
Acked-by: Alex Deucher <alexander.deucher@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 ef1975a5323a..17a5cbfd0024 100644
--- a/drivers/gpu/drm/amd/amdgpu/gfx_v10_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gfx_v10_0.c
@@ -3094,6 +3094,7 @@ 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);
--
2.17.1
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