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Message-Id: <20230517-topic-a7xx_prep-v2-5-5b9daa2b2cf0@linaro.org>
Date: Fri, 19 May 2023 15:29:10 +0200
From: Konrad Dybcio <konrad.dybcio@...aro.org>
To: Rob Clark <robdclark@...il.com>,
Abhinav Kumar <quic_abhinavk@...cinc.com>,
Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
Sean Paul <sean@...rly.run>, David Airlie <airlied@...il.com>,
Daniel Vetter <daniel@...ll.ch>
Cc: Marijn Suijten <marijn.suijten@...ainline.org>,
Jonathan Marek <jonathan@...ek.ca>,
linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
Konrad Dybcio <konrad.dybcio@...aro.org>
Subject: [PATCH v2 5/6] drm/msm/a6xx: Improve GMU force shutdown sequence
The GMU force shutdown sequence involves some additional register cleanup
which was not implemented previously. Do so.
Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>
---
drivers/gpu/drm/msm/adreno/a6xx_gmu.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
index ea6d671e7c6c..8004b582e45f 100644
--- a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
+++ b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
@@ -930,6 +930,13 @@ static void a6xx_gmu_force_off(struct a6xx_gmu *gmu)
/* Make sure there are no outstanding RPMh votes */
a6xx_gmu_rpmh_off(gmu);
+ /* Clear the WRITEDROPPED fields and put fence into allow mode */
+ gmu_write(gmu, REG_A6XX_GMU_AHB_FENCE_STATUS_CLR, 0x7);
+ gmu_write(gmu, REG_A6XX_GMU_AO_AHB_FENCE_CTRL, 0);
+
+ /* Make sure the above writes go through */
+ wmb();
+
/* Halt the gmu cm3 core */
gmu_write(gmu, REG_A6XX_GMU_CM3_SYSRESET, 1);
--
2.40.1
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