linux-kernel - [PATCH v12 1/6] staging: vc04_services: bcm2835-camera: Explicitly set DMA mask

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Message-Id: <20230923143200.268063-2-umang.jain@ideasonboard.com>
Date:   Sat, 23 Sep 2023 20:01:55 +0530
From:   Umang Jain <umang.jain@...asonboard.com>
To:     linux-staging@...ts.linux.dev,
        linux-arm-kernel@...ts.infradead.org,
        linux-rpi-kernel@...ts.infradead.org, linux-media@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Stefan Wahren <stefan.wahren@...e.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Florian Fainelli <f.fainelli@...il.com>,
        Adrien Thierry <athierry@...hat.com>,
        Dan Carpenter <error27@...il.com>,
        Dave Stevenson <dave.stevenson@...pberrypi.com>,
        Kieran Bingham <kieran.bingham@...asonboard.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Umang Jain <umang.jain@...asonboard.com>
Subject: [PATCH v12 1/6] staging: vc04_services: bcm2835-camera: Explicitly set DMA mask

In the following patches, vchiq_arm will be migrated to create and use
its own bus and all the vchiq drivers (bcm2835-camera, bcm2835-audio)
will be registered to it. Since the platform driver/device model
internally sets the DMA mask for its registered devices, we would have
to do it ourself when we remove the platform driver/device registration
for vchiq devices.

This patch explicitly sets the DMA mask to bcm2835-camera so as not
to introduce a regression when we move away from platform
device/driver model.

Signed-off-by: Umang Jain <umang.jain@...asonboard.com>
---
 .../staging/vc04_services/bcm2835-camera/bcm2835-camera.c   | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/staging/vc04_services/bcm2835-camera/bcm2835-camera.c b/drivers/staging/vc04_services/bcm2835-camera/bcm2835-camera.c
index 346d00df815a..fcad5118f3e8 100644
--- a/drivers/staging/vc04_services/bcm2835-camera/bcm2835-camera.c
+++ b/drivers/staging/vc04_services/bcm2835-camera/bcm2835-camera.c
@@ -1852,6 +1852,12 @@ static int bcm2835_mmal_probe(struct platform_device *pdev)
 	unsigned int resolutions[MAX_BCM2835_CAMERAS][2];
 	int i;
 
+	ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
+	if (ret) {
+		dev_err(&pdev->dev, "dma_set_mask_and_coherent failed: %d\n", ret);
+		return ret;
+	}
+
 	ret = vchiq_mmal_init(&instance);
 	if (ret < 0)
 		return ret;
-- 
2.40.1