linux-kernel - [PATCH v1] drm/panfrost: Sync IRQ by job's timeout handler

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Date:   Mon, 17 Jul 2023 09:52:54 +0300
From:   Dmitry Osipenko <dmitry.osipenko@...labora.com>
To:     Rob Herring <robh@...nel.org>, Steven Price <steven.price@....com>,
        Boris Brezillon <boris.brezillon@...labora.com>
Cc:     dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        kernel@...labora.com
Subject: [PATCH v1] drm/panfrost: Sync IRQ by job's timeout handler

Panfrost IRQ handler may stuck for a long time, for example this happens
when there is a bad HDMI connection and HDMI handler takes a long time to
finish processing, holding Panfrost. Make Panfrost's job timeout handler
to sync IRQ before checking fence signal status in order to prevent
spurious job timeouts due to a slow IRQ processing.

Signed-off-by: Dmitry Osipenko <dmitry.osipenko@...labora.com>
---
 drivers/gpu/drm/panfrost/panfrost_job.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/panfrost/panfrost_job.c b/drivers/gpu/drm/panfrost/panfrost_job.c
index dbc597ab46fb..a356163da22d 100644
--- a/drivers/gpu/drm/panfrost/panfrost_job.c
+++ b/drivers/gpu/drm/panfrost/panfrost_job.c
@@ -713,6 +713,8 @@ static enum drm_gpu_sched_stat panfrost_job_timedout(struct drm_sched_job
 	struct panfrost_device *pfdev = job->pfdev;
 	int js = panfrost_job_get_slot(job);
 
+	synchronize_irq(pfdev->js->irq);
+
 	/*
 	 * If the GPU managed to complete this jobs fence, the timeout is
 	 * spurious. Bail out.
-- 
2.41.0