linux-kernel - [PATCH 4/5] misc: vop: set VIRTIO_F_ACCESS

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Date:   Fri, 25 Sep 2020 15:26:29 +0800
From:   Sherry Sun <sherry.sun@....com>
To:     sudeep.dutt@...el.com, ashutosh.dixit@...el.com, arnd@...db.de,
        gregkh@...uxfoundation.org, wang.yi59@....com.cn,
        huang.zijiang@....com.cn, rikard.falkeborn@...il.com,
        lee.jones@...aro.org, mst@...hat.com
Cc:     linux-kernel@...r.kernel.org, linux-imx@....com
Subject: [PATCH 4/5] misc: vop: set VIRTIO_F_ACCESS_PLATFORM for nocoherent platform

Set VIRTIO_F_ACCESS_PLATFORM feature for nocoherent platform, since
it needs the DMA API for virtio.

Signed-off-by: Sherry Sun <sherry.sun@....com>
Signed-off-by: Joakim Zhang <qiangqing.zhang@....com>
---
 drivers/misc/mic/vop/vop_main.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/misc/mic/vop/vop_main.c b/drivers/misc/mic/vop/vop_main.c
index d3645122c983..d609f0dc6124 100644
--- a/drivers/misc/mic/vop/vop_main.c
+++ b/drivers/misc/mic/vop/vop_main.c
@@ -125,6 +125,9 @@ static void vop_transport_features(struct virtio_device *vdev)
 	 * creates virtio rings on preallocated memory.
 	 */
 	__virtio_clear_bit(vdev, VIRTIO_F_RING_PACKED);
+
+	if (!dev_is_dma_coherent(vdev->dev.parent))
+		__virtio_set_bit(vdev, VIRTIO_F_ACCESS_PLATFORM);
 }
 
 static int vop_finalize_features(struct virtio_device *vdev)
-- 
2.17.1