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 <boris.brezillon@collabora.com>
Reviewed-by: Steven Price <steven.price@arm.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210630062751.2832545-13-boris.brezillon@collabora.com

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;
 }