drm/msm/a5xx: properly clear preemption records on resume

[ Upstream commit 64fd6d01a52904bdbda0ce810a45a428c995a4ca ]

Two fields of preempt_record which are used by CP aren't reset on
resume: "data" and "info". This is the reason behind faults which happen
when we try to switch to the ring that was active last before suspend.
In addition those faults can't be recovered from because we use suspend
and resume to do so (keeping values of those fields again).

Fixes: b1fc2839d2f9 ("drm/msm: Implement preemption for A5XX targets")
Signed-off-by: Vladimir Lypak <vladimir.lypak@gmail.com>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/612043/
Signed-off-by: Rob Clark <robdclark@chromium.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/gpu/drm/msm/adreno/a5xx_preempt.c b/drivers/gpu/drm/msm/adreno/a5xx_preempt.c
index e0eef47dae632d3e8e7a484556d0adb3b8bab500..79b43803b61419d2cea038f890180540383a7e67 100644 (file)
--- a/drivers/gpu/drm/msm/adreno/a5xx_preempt.c
+++ b/drivers/gpu/drm/msm/adreno/a5xx_preempt.c
@@ -205,6 +205,8 @@ void a5xx_preempt_hw_init(struct msm_gpu *gpu)
                return;
 
        for (i = 0; i < gpu->nr_rings; i++) {
+               a5xx_gpu->preempt[i]->data = 0;
+               a5xx_gpu->preempt[i]->info = 0;
                a5xx_gpu->preempt[i]->wptr = 0;
                a5xx_gpu->preempt[i]->rptr = 0;
                a5xx_gpu->preempt[i]->rbase = gpu->rb[i]->iova;