virtio_mmio: add support to set IRQ of a virtio device as wakeup source

According to virtio_mmio wakeup flag in device trees, set its IRQ
as wakeup source in virtqueue initialization.

Signed-off-by: Minghao Xue <quic_mingxue@quicinc.com>
Message-Id: <1654851507-13891-3-git-send-email-quic_mingxue@quicinc.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

diff --git a/drivers/virtio/virtio_mmio.c b/drivers/virtio/virtio_mmio.c
index 083ff1e..945cb8f 100644 (file)
--- a/drivers/virtio/virtio_mmio.c
+++ b/drivers/virtio/virtio_mmio.c
@@ -487,6 +487,9 @@ static int vm_find_vqs(struct virtio_device *vdev, unsigned int nvqs,
        if (err)
                return err;
 
+       if (of_property_read_bool(vm_dev->pdev->dev.of_node, "wakeup-source"))
+               enable_irq_wake(irq);
+
        for (i = 0; i < nvqs; ++i) {
                if (!names[i]) {
                        vqs[i] = NULL;