linux-kernel - [PATCH v1 07/10] drm/msm/adreno: Retry on gpu resume failure

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Date:   Wed,  2 Mar 2022 22:57:33 +0530
From:   Akhil P Oommen <quic_akhilpo@...cinc.com>
To:     freedreno <freedreno@...ts.freedesktop.org>,
        dri-devel@...ts.freedesktop.org, linux-arm-msm@...r.kernel.org,
        Rob Clark <robdclark@...il.com>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     Abhinav Kumar <quic_abhinavk@...cinc.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...ux.ie>,
        Jonathan Marek <jonathan@...ek.ca>,
        Sean Paul <sean@...rly.run>,
        Vladimir Lypak <vladimir.lypak@...il.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH v1 07/10] drm/msm/adreno: Retry on gpu resume failure

Retry infinitely on resume failure because there is nothing much we can
do if GPU is not ON. Also, this helps us to avoid checking for the
return value of pm_runtime_get() to see if GPU is ON.

Signed-off-by: Akhil P Oommen <quic_akhilpo@...cinc.com>
---

 drivers/gpu/drm/msm/adreno/adreno_device.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/msm/adreno/adreno_device.c b/drivers/gpu/drm/msm/adreno/adreno_device.c
index 89cfd84..abcc553 100644
--- a/drivers/gpu/drm/msm/adreno/adreno_device.c
+++ b/drivers/gpu/drm/msm/adreno/adreno_device.c
@@ -603,8 +603,16 @@ static const struct of_device_id dt_match[] = {
 static int adreno_resume(struct device *dev)
 {
 	struct msm_gpu *gpu = dev_to_gpu(dev);
+	int ret;
+
+	/* What hope do we have for the future if we can't turn ON gpu */
+	while (true) {
+		ret = gpu->funcs->pm_resume(gpu);
+		if (!ret)
+			break;
+	}
 
-	return gpu->funcs->pm_resume(gpu);
+	return 0;
 }
 
 static int active_submits(struct msm_gpu *gpu)
-- 
2.7.4