linux-kernel - [PATCH v2 2/2] virtio_mmio: add support to set IRQ of a virtio device as wakeup source

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Date:   Fri, 10 Jun 2022 16:58:27 +0800
From:   Minghao Xue <quic_mingxue@...cinc.com>
To:     "Michael S. Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        Rob Herring <robh+dt@...nel.org>
CC:     Minghao Xue <quic_mingxue@...cinc.com>,
        Jean-Philippe Brucker <jean-philippe@...aro.org>,
        <virtualization@...ts.linux-foundation.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <quic_ztu@...cinc.com>
Subject: [PATCH v2 2/2] 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@...cinc.com>
---
 drivers/virtio/virtio_mmio.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/virtio/virtio_mmio.c b/drivers/virtio/virtio_mmio.c
index f9a36bc..c144442 100644
--- a/drivers/virtio/virtio_mmio.c
+++ b/drivers/virtio/virtio_mmio.c
@@ -486,6 +486,9 @@ 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;
-- 
2.7.4