[PATCH 2/2] drm/amdgpu/umsch: reinitialize write pointer in hw init

[Xu, Feifei]

[AMD Official Use Only - General]

Series is Reviewed-by: Feifei Xu <Feifei Xu at amd.com>

-----Original Message-----
From: amd-gfx <amd-gfx-bounces at lists.freedesktop.org> On Behalf Of Lang Yu
Sent: Monday, March 25, 2024 1:37 PM
To: amd-gfx at lists.freedesktop.org
Cc: Deucher, Alexander <Alexander.Deucher at amd.com>; Koenig, Christian <Christian.Koenig at amd.com>; Gopalakrishnan, Veerabadhran (Veera) <Veerabadhran.Gopalakrishnan at amd.com>; Yu, Lang <Lang.Yu at amd.com>
Subject: [PATCH 2/2] drm/amdgpu/umsch: reinitialize write pointer in hw init

Otherwise the old one will be used during GPU reset.
That's not expected.

Signed-off-by: Lang Yu <Lang.Yu at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/umsch_mm_v4_0.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/umsch_mm_v4_0.c b/drivers/gpu/drm/amd/amdgpu/umsch_mm_v4_0.c
index 84368cf1e175..bd57896ab85d 100644
--- a/drivers/gpu/drm/amd/amdgpu/umsch_mm_v4_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/umsch_mm_v4_0.c
@@ -225,6 +225,8 @@ static int umsch_mm_v4_0_ring_start(struct amdgpu_umsch_mm *umsch)

        WREG32_SOC15(VCN, 0, regVCN_UMSCH_RB_SIZE, ring->ring_size);

+       ring->wptr = 0;
+
        data = RREG32_SOC15(VCN, 0, regVCN_RB_ENABLE);
        data &= ~(VCN_RB_ENABLE__AUDIO_RB_EN_MASK);
        WREG32_SOC15(VCN, 0, regVCN_RB_ENABLE, data);
--
2.25.1