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Message-Id: <20230913195354.835884-4-umang.jain@ideasonboard.com>
Date: Thu, 14 Sep 2023 01:23:52 +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 v11 3/5] staging: bcm2835-camera: Register bcm2835-camera with vchiq_bus_type
Register the bcm2835-camera with the vchiq_bus_type instead of using
platform driver/device.
Since we moved away bcm2835-camera from platform driver/device,
we have to set the DMA mask explicitly. Set the DMA mask at probe
time.
Also the VCHIQ firmware doesn't support device enumeration, hence
one has to maintain a list of devices to be registered in the interface.
Signed-off-by: Umang Jain <umang.jain@...asonboard.com>
---
.../bcm2835-camera/bcm2835-camera.c | 26 +++++++++++++------
.../interface/vchiq_arm/vchiq_arm.c | 11 +++++---
2 files changed, 26 insertions(+), 11 deletions(-)
diff --git a/drivers/staging/vc04_services/bcm2835-camera/bcm2835-camera.c b/drivers/staging/vc04_services/bcm2835-camera/bcm2835-camera.c
index 346d00df815a..52431b834232 100644
--- a/drivers/staging/vc04_services/bcm2835-camera/bcm2835-camera.c
+++ b/drivers/staging/vc04_services/bcm2835-camera/bcm2835-camera.c
@@ -11,6 +11,7 @@
* Luke Diamand @ Broadcom
*/
+#include <linux/dma-mapping.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/module.h>
@@ -24,8 +25,9 @@
#include <media/v4l2-event.h>
#include <media/v4l2-common.h>
#include <linux/delay.h>
-#include <linux/platform_device.h>
+#include "../interface/vchiq_arm/vchiq_arm.h"
+#include "../interface/vchiq_arm/vchiq_device.h"
#include "../vchiq-mmal/mmal-common.h"
#include "../vchiq-mmal/mmal-encodings.h"
#include "../vchiq-mmal/mmal-vchiq.h"
@@ -1841,7 +1843,7 @@ static struct v4l2_format default_v4l2_format = {
.fmt.pix.sizeimage = 1024 * 768,
};
-static int bcm2835_mmal_probe(struct platform_device *pdev)
+static int bcm2835_mmal_probe(struct vchiq_device *device)
{
int ret;
struct bcm2835_mmal_dev *dev;
@@ -1852,6 +1854,14 @@ static int bcm2835_mmal_probe(struct platform_device *pdev)
unsigned int resolutions[MAX_BCM2835_CAMERAS][2];
int i;
+ if (!device->dev.dma_mask)
+ device->dev.dma_mask = &device->dev.coherent_dma_mask;
+ ret = dma_set_coherent_mask(&device->dev, DMA_BIT_MASK(32));
+ if (ret) {
+ dev_err(&device->dev, "can't set coherent DMA mask: %d\n", ret);
+ return ret;
+ }
+
ret = vchiq_mmal_init(&instance);
if (ret < 0)
return ret;
@@ -1896,7 +1906,7 @@ static int bcm2835_mmal_probe(struct platform_device *pdev)
&camera_instance);
ret = v4l2_device_register(NULL, &dev->v4l2_dev);
if (ret) {
- dev_err(&pdev->dev, "%s: could not register V4L2 device: %d\n",
+ dev_err(&device->dev, "%s: could not register V4L2 device: %d\n",
__func__, ret);
goto free_dev;
}
@@ -1976,7 +1986,7 @@ static int bcm2835_mmal_probe(struct platform_device *pdev)
return ret;
}
-static void bcm2835_mmal_remove(struct platform_device *pdev)
+static void bcm2835_mmal_remove(struct vchiq_device *device)
{
int camera;
struct vchiq_mmal_instance *instance = gdev[0]->instance;
@@ -1988,17 +1998,17 @@ static void bcm2835_mmal_remove(struct platform_device *pdev)
vchiq_mmal_finalise(instance);
}
-static struct platform_driver bcm2835_camera_driver = {
+static struct vchiq_driver bcm2835_camera_driver = {
.probe = bcm2835_mmal_probe,
- .remove_new = bcm2835_mmal_remove,
+ .remove = bcm2835_mmal_remove,
.driver = {
.name = "bcm2835-camera",
},
};
-module_platform_driver(bcm2835_camera_driver)
+module_vchiq_driver(bcm2835_camera_driver)
MODULE_DESCRIPTION("Broadcom 2835 MMAL video capture");
MODULE_AUTHOR("Vincent Sanders");
MODULE_LICENSE("GPL");
-MODULE_ALIAS("platform:bcm2835-camera");
+MODULE_ALIAS("bcm2835-camera");
diff --git a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
index d993a91de237..14bdde610f3a 100644
--- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
+++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
@@ -67,8 +67,13 @@ int vchiq_susp_log_level = VCHIQ_LOG_ERROR;
DEFINE_SPINLOCK(msg_queue_spinlock);
struct vchiq_state g_state;
-static struct platform_device *bcm2835_camera;
static struct platform_device *bcm2835_audio;
+/*
+ * The devices implemented in the VCHIQ firmware are not discoverable,
+ * so we need to maintain a list of them in order to register them with
+ * the interface.
+ */
+static struct vchiq_device *bcm2835_camera;
struct vchiq_drvdata {
const unsigned int cache_line_size;
@@ -1840,8 +1845,8 @@ static int vchiq_probe(struct platform_device *pdev)
goto error_exit;
}
- bcm2835_camera = vchiq_register_child(pdev, "bcm2835-camera");
bcm2835_audio = vchiq_register_child(pdev, "bcm2835_audio");
+ bcm2835_camera = vchiq_device_register(&pdev->dev, "bcm2835-camera");
return 0;
@@ -1854,7 +1859,7 @@ static int vchiq_probe(struct platform_device *pdev)
static void vchiq_remove(struct platform_device *pdev)
{
platform_device_unregister(bcm2835_audio);
- platform_device_unregister(bcm2835_camera);
+ vchiq_device_unregister(bcm2835_camera);
vchiq_debugfs_deinit();
vchiq_deregister_chrdev();
}
--
2.40.1
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