drm/panfrost: Reset the GPU when the AS_ACTIVE bit is stuck

Things are unlikely to resolve until we reset the GPU. Let's not wait for other faults/timeout to happen to trigger this reset. Signed-off-by: Boris Brezillon <[email protected]> Reviewed-by: Steven Price <[email protected]> Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
kawasaki · Jul 1, 2021 · f9ab9c6 · f9ab9c6
1 parent ed7a34c
commit f9ab9c6
Showing 1 changed file with 4 additions and 1 deletion.
diff --git a/drivers/gpu/drm/panfrost/panfrost_mmu.c b/drivers/gpu/drm/panfrost/panfrost_mmu.c
@@ -36,8 +36,11 @@ static int wait_ready(struct panfrost_device *pfdev, u32 as_nr)
 	ret = readl_relaxed_poll_timeout_atomic(pfdev->iomem + AS_STATUS(as_nr),
 		val, !(val & AS_STATUS_AS_ACTIVE), 10, 1000);
 
-	if (ret)
+	if (ret) {
+		/* The GPU hung, let's trigger a reset */
+		panfrost_device_schedule_reset(pfdev);
 		dev_err(pfdev->dev, "AS_ACTIVE bit stuck\n");
+	}
 
 	return ret;
 }