path: root/bcm2835-vc04_services-Improve-driver-load-unload.patch

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From: Stefan Wahren <stefan.wahren@i2se.com>
To: Eric Anholt <eric@anholt.net>, gregkh@linuxfoundation.org,
 Dave Stevenson <dave.stevenson@raspberrypi.org>
Subject: [PATCH RFC 01/11] staging: bcm2835-camera: Abort probe if there is no
 camera
Date: Thu, 25 Oct 2018 17:29:25 +0200
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Abort the probing of the camera driver in case there isn't a camera
actually connected to the Raspberry Pi. This solution also avoids a
NULL ptr dereference of mmal instance on driver unload.

Fixes: 7b3ad5abf027 ("staging: Import the BCM2835 MMAL-based V4L2 camera driver.")
Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
---
 drivers/staging/vc04_services/bcm2835-camera/bcm2835-camera.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/staging/vc04_services/bcm2835-camera/bcm2835-camera.c b/drivers/staging/vc04_services/bcm2835-camera/bcm2835-camera.c
index c04bdf0..d6fbef7 100644
--- a/drivers/staging/vc04_services/bcm2835-camera/bcm2835-camera.c
+++ b/drivers/staging/vc04_services/bcm2835-camera/bcm2835-camera.c
@@ -1841,6 +1841,12 @@ static int bcm2835_mmal_probe(struct platform_device *pdev)
 	num_cameras = get_num_cameras(instance,
 				      resolutions,
 				      MAX_BCM2835_CAMERAS);
+
+	if (num_cameras < 1) {
+		ret = -ENODEV;
+		goto cleanup_mmal;
+	}
+
 	if (num_cameras > MAX_BCM2835_CAMERAS)
 		num_cameras = MAX_BCM2835_CAMERAS;
 
@@ -1940,6 +1946,9 @@ static int bcm2835_mmal_probe(struct platform_device *pdev)
 	pr_info("%s: error %d while loading driver\n",
 		BM2835_MMAL_MODULE_NAME, ret);
 
+cleanup_mmal:
+	vchiq_mmal_finalise(instance);
+
 	return ret;
 }
 

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From: Stefan Wahren <stefan.wahren@i2se.com>
To: Eric Anholt <eric@anholt.net>, gregkh@linuxfoundation.org,
 Dave Stevenson <dave.stevenson@raspberrypi.org>
Subject: [PATCH RFC 02/11] staging: bcm2835-camera: fix module autoloading
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In order to make the module bcm2835-camera load automatically, we need to
add a module alias.

Fixes: 4bebb0312ea9 ("staging/bcm2835-camera: Set ourselves up as a platform driver.")
Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
---
 drivers/staging/vc04_services/bcm2835-camera/bcm2835-camera.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/staging/vc04_services/bcm2835-camera/bcm2835-camera.c b/drivers/staging/vc04_services/bcm2835-camera/bcm2835-camera.c
index d6fbef7..7d3222c 100644
--- a/drivers/staging/vc04_services/bcm2835-camera/bcm2835-camera.c
+++ b/drivers/staging/vc04_services/bcm2835-camera/bcm2835-camera.c
@@ -47,6 +47,7 @@ MODULE_DESCRIPTION("Broadcom 2835 MMAL video capture");
 MODULE_AUTHOR("Vincent Sanders");
 MODULE_LICENSE("GPL");
 MODULE_VERSION(BM2835_MMAL_VERSION);
+MODULE_ALIAS("platform:bcm2835-camera");
 
 int bcm2835_v4l2_debug;
 module_param_named(debug, bcm2835_v4l2_debug, int, 0644);

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To: Eric Anholt <eric@anholt.net>, gregkh@linuxfoundation.org,
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Subject: [PATCH RFC 03/11] staging: bcm2835-camera: Move module info to the
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In order to have this more consistent between the vc04 services move
the module information to the end of the file.

Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
---
 .../staging/vc04_services/bcm2835-camera/bcm2835-camera.c    | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/staging/vc04_services/bcm2835-camera/bcm2835-camera.c b/drivers/staging/vc04_services/bcm2835-camera/bcm2835-camera.c
index 7d3222c..cd773eb 100644
--- a/drivers/staging/vc04_services/bcm2835-camera/bcm2835-camera.c
+++ b/drivers/staging/vc04_services/bcm2835-camera/bcm2835-camera.c
@@ -43,12 +43,6 @@
 
 #define MAX_BCM2835_CAMERAS 2
 
-MODULE_DESCRIPTION("Broadcom 2835 MMAL video capture");
-MODULE_AUTHOR("Vincent Sanders");
-MODULE_LICENSE("GPL");
-MODULE_VERSION(BM2835_MMAL_VERSION);
-MODULE_ALIAS("platform:bcm2835-camera");
-
 int bcm2835_v4l2_debug;
 module_param_named(debug, bcm2835_v4l2_debug, int, 0644);
 MODULE_PARM_DESC(bcm2835_v4l2_debug, "Debug level 0-2");
@@ -1976,3 +1970,9 @@ static struct platform_driver bcm2835_camera_driver = {
 };
 
 module_platform_driver(bcm2835_camera_driver)
+
+MODULE_DESCRIPTION("Broadcom 2835 MMAL video capture");
+MODULE_AUTHOR("Vincent Sanders");
+MODULE_LICENSE("GPL");
+MODULE_VERSION(BM2835_MMAL_VERSION);
+MODULE_ALIAS("platform:bcm2835-camera");

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Subject: [PATCH RFC 04/11] staging: vchiq_arm: Fix platform device
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In error case platform_device_register_data would return an ERR_PTR
instead of NULL. So we better check this before unregistration.

Fixes: 37b7b3087a2f ("staging/vc04_services: Register a platform device for the camera driver.")
Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
---
 drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

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 ea78937..d7d7c2f0 100644
--- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
+++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
@@ -3672,7 +3672,8 @@ static int vchiq_probe(struct platform_device *pdev)
 
 static int vchiq_remove(struct platform_device *pdev)
 {
-	platform_device_unregister(bcm2835_camera);
+	if (!IS_ERR(bcm2835_camera))
+		platform_device_unregister(bcm2835_camera);
 	vchiq_debugfs_deinit();
 	device_destroy(vchiq_class, vchiq_devid);
 	class_destroy(vchiq_class);

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Subject: [PATCH RFC 05/11] staging: vchiq_arm: Fix camera device registration
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Since the camera driver isn't probed via DT, we need to properly setup DMA.

Fixes: 37b7b3087a2f ("staging/vc04_services: Register a platform device for the camera driver.")
Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
---
 .../vc04_services/interface/vchiq_arm/vchiq_arm.c    | 20 +++++++++++++++++---
 1 file changed, 17 insertions(+), 3 deletions(-)

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 d7d7c2f0..778a252 100644
--- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
+++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
@@ -49,6 +49,7 @@
 #include <linux/of.h>
 #include <linux/platform_device.h>
 #include <linux/compat.h>
+#include <linux/dma-mapping.h>
 #include <soc/bcm2835/raspberrypi-firmware.h>
 
 #include "vchiq_core.h"
@@ -3588,6 +3589,21 @@ static const struct of_device_id vchiq_of_match[] = {
 };
 MODULE_DEVICE_TABLE(of, vchiq_of_match);
 
+static struct platform_device *
+vchiq_register_child(struct platform_device *pdev, const char *name)
+{
+	struct platform_device_info pdevinfo;
+
+	memset(&pdevinfo, 0, sizeof(pdevinfo));
+
+	pdevinfo.parent = &pdev->dev;
+	pdevinfo.name = name;
+	pdevinfo.id = PLATFORM_DEVID_NONE;
+	pdevinfo.dma_mask = DMA_BIT_MASK(32);
+
+	return platform_device_register_full(&pdevinfo);
+}
+
 static int vchiq_probe(struct platform_device *pdev)
 {
 	struct device_node *fw_node;
@@ -3653,9 +3669,7 @@ static int vchiq_probe(struct platform_device *pdev)
 		VCHIQ_VERSION, VCHIQ_VERSION_MIN,
 		MAJOR(vchiq_devid), MINOR(vchiq_devid));
 
-	bcm2835_camera = platform_device_register_data(&pdev->dev,
-						       "bcm2835-camera", -1,
-						       NULL, 0);
+	bcm2835_camera = vchiq_register_child(pdev, "bcm2835-camera");
 
 	return 0;
 

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Subject: [PATCH RFC 06/11] staging: vchiq_arm: Register a platform device for
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Following Eric's commit 37b7b3087a2f ("staging/vc04_services: Register a
platform device for the camera driver.") this register the audio driver as
a platform device, too.

Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
---
 drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c | 4 ++++
 1 file changed, 4 insertions(+)

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 778a252..fc6388b 100644
--- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
+++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
@@ -170,6 +170,7 @@ static struct class  *vchiq_class;
 static struct device *vchiq_dev;
 static DEFINE_SPINLOCK(msg_queue_spinlock);
 static struct platform_device *bcm2835_camera;
+static struct platform_device *bcm2835_audio;
 
 static struct vchiq_drvdata bcm2835_drvdata = {
 	.cache_line_size = 32,
@@ -3670,6 +3671,7 @@ static int vchiq_probe(struct platform_device *pdev)
 		MAJOR(vchiq_devid), MINOR(vchiq_devid));
 
 	bcm2835_camera = vchiq_register_child(pdev, "bcm2835-camera");
+	bcm2835_audio = vchiq_register_child(pdev, "bcm2835_audio");
 
 	return 0;
 
@@ -3686,6 +3688,8 @@ static int vchiq_probe(struct platform_device *pdev)
 
 static int vchiq_remove(struct platform_device *pdev)
 {
+	if (!IS_ERR(bcm2835_audio))
+		platform_device_unregister(bcm2835_audio);
 	if (!IS_ERR(bcm2835_camera))
 		platform_device_unregister(bcm2835_camera);
 	vchiq_debugfs_deinit();

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Enable the compilation test for bcm2835-audio to gain more build coverage.

Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
---
 drivers/staging/vc04_services/bcm2835-audio/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/staging/vc04_services/bcm2835-audio/Kconfig b/drivers/staging/vc04_services/bcm2835-audio/Kconfig
index 9f53653..62c1c8b 100644
--- a/drivers/staging/vc04_services/bcm2835-audio/Kconfig
+++ b/drivers/staging/vc04_services/bcm2835-audio/Kconfig
@@ -1,6 +1,6 @@
 config SND_BCM2835
         tristate "BCM2835 Audio"
-        depends on ARCH_BCM2835 && SND
+        depends on (ARCH_BCM2835 || COMPILE_TEST) && SND
         select SND_PCM
         select BCM2835_VCHIQ
         help

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From: Stefan Wahren <stefan.wahren@i2se.com>
To: Eric Anholt <eric@anholt.net>, gregkh@linuxfoundation.org,
 Dave Stevenson <dave.stevenson@raspberrypi.org>
Subject: [PATCH RFC 08/11] staging: bcm2835-audio: use
 module_platform_driver() macro
Date: Thu, 25 Oct 2018 17:29:32 +0200
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There is not much value behind this boilerplate, so use
module_platform_driver() instead.

Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
---
 .../staging/vc04_services/bcm2835-audio/bcm2835.c    | 20 +-------------------
 1 file changed, 1 insertion(+), 19 deletions(-)

diff --git a/drivers/staging/vc04_services/bcm2835-audio/bcm2835.c b/drivers/staging/vc04_services/bcm2835-audio/bcm2835.c
index 87d56ab..87a27fd 100644
--- a/drivers/staging/vc04_services/bcm2835-audio/bcm2835.c
+++ b/drivers/staging/vc04_services/bcm2835-audio/bcm2835.c
@@ -356,25 +356,7 @@ static struct platform_driver bcm2835_alsa0_driver = {
 		.of_match_table = snd_bcm2835_of_match_table,
 	},
 };
-
-static int bcm2835_alsa_device_init(void)
-{
-	int retval;
-
-	retval = platform_driver_register(&bcm2835_alsa0_driver);
-	if (retval)
-		pr_err("Error registering bcm2835_audio driver %d .\n", retval);
-
-	return retval;
-}
-
-static void bcm2835_alsa_device_exit(void)
-{
-	platform_driver_unregister(&bcm2835_alsa0_driver);
-}
-
-late_initcall(bcm2835_alsa_device_init);
-module_exit(bcm2835_alsa_device_exit);
+module_platform_driver(bcm2835_alsa0_driver);
 
 MODULE_AUTHOR("Dom Cobley");
 MODULE_DESCRIPTION("Alsa driver for BCM2835 chip");

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Subject: [PATCH RFX 09/11] staging: bcm2835-audio: Drop DT dependency
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Just like the bcm2835-video make this a platform driver which is probed
by vchiq. In order to change the number of channels use a module
parameter instead, but use the maximum as default.

Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
---
 .../staging/vc04_services/bcm2835-audio/bcm2835.c  | 41 ++++++++++------------
 1 file changed, 19 insertions(+), 22 deletions(-)

diff --git a/drivers/staging/vc04_services/bcm2835-audio/bcm2835.c b/drivers/staging/vc04_services/bcm2835-audio/bcm2835.c
index 87a27fd..5c5b600 100644
--- a/drivers/staging/vc04_services/bcm2835-audio/bcm2835.c
+++ b/drivers/staging/vc04_services/bcm2835-audio/bcm2835.c
@@ -4,15 +4,17 @@
 #include <linux/platform_device.h>
 
 #include <linux/init.h>
+#include <linux/dma-mapping.h>
+#include <linux/of_device.h>
 #include <linux/slab.h>
 #include <linux/module.h>
-#include <linux/of.h>
 
 #include "bcm2835.h"
 
 static bool enable_hdmi;
 static bool enable_headphones;
 static bool enable_compat_alsa = true;
+static int num_channels = MAX_SUBSTREAMS;
 
 module_param(enable_hdmi, bool, 0444);
 MODULE_PARM_DESC(enable_hdmi, "Enables HDMI virtual audio device");
@@ -21,6 +23,8 @@ MODULE_PARM_DESC(enable_headphones, "Enables Headphones virtual audio device");
 module_param(enable_compat_alsa, bool, 0444);
 MODULE_PARM_DESC(enable_compat_alsa,
 		 "Enables ALSA compatibility virtual audio device");
+module_param(num_channels, int, 0644);
+MODULE_PARM_DESC(num_channels, "Number of audio channels (default: 8)");
 
 static void bcm2835_devm_free_vchi_ctx(struct device *dev, void *res)
 {
@@ -293,31 +297,30 @@ static int snd_add_child_devices(struct device *device, u32 numchans)
 	return 0;
 }
 
-static int snd_bcm2835_alsa_probe_dt(struct platform_device *pdev)
+static int snd_bcm2835_alsa_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
-	u32 numchans;
 	int err;
 
-	err = of_property_read_u32(dev->of_node, "brcm,pwm-channels",
-				   &numchans);
-	if (err) {
-		dev_err(dev, "Failed to get DT property 'brcm,pwm-channels'");
-		return err;
+	if (num_channels <= 0 || num_channels > MAX_SUBSTREAMS) {
+		num_channels = MAX_SUBSTREAMS;
+		dev_warn(dev, "Illegal num_channels value, will use %u\n",
+			 num_channels);
 	}
 
-	if (numchans == 0 || numchans > MAX_SUBSTREAMS) {
-		numchans = MAX_SUBSTREAMS;
-		dev_warn(dev,
-			 "Illegal 'brcm,pwm-channels' value, will use %u\n",
-			 numchans);
+	dev->coherent_dma_mask = DMA_BIT_MASK(32);
+	dev->dma_mask = &dev->coherent_dma_mask;
+	err = of_dma_configure(dev, NULL, true);
+	if (err) {
+		dev_err(dev, "Unable to setup DMA: %d\n", err);
+		return err;
 	}
 
 	err = bcm2835_devm_add_vchi_ctx(dev);
 	if (err)
 		return err;
 
-	err = snd_add_child_devices(dev, numchans);
+	err = snd_add_child_devices(dev, num_channels);
 	if (err)
 		return err;
 
@@ -339,21 +342,14 @@ static int snd_bcm2835_alsa_resume(struct platform_device *pdev)
 
 #endif
 
-static const struct of_device_id snd_bcm2835_of_match_table[] = {
-	{ .compatible = "brcm,bcm2835-audio",},
-	{},
-};
-MODULE_DEVICE_TABLE(of, snd_bcm2835_of_match_table);
-
 static struct platform_driver bcm2835_alsa0_driver = {
-	.probe = snd_bcm2835_alsa_probe_dt,
+	.probe = snd_bcm2835_alsa_probe,
 #ifdef CONFIG_PM
 	.suspend = snd_bcm2835_alsa_suspend,
 	.resume = snd_bcm2835_alsa_resume,
 #endif
 	.driver = {
 		.name = "bcm2835_audio",
-		.of_match_table = snd_bcm2835_of_match_table,
 	},
 };
 module_platform_driver(bcm2835_alsa0_driver);
@@ -361,3 +357,4 @@ module_platform_driver(bcm2835_alsa0_driver);
 MODULE_AUTHOR("Dom Cobley");
 MODULE_DESCRIPTION("Alsa driver for BCM2835 chip");
 MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:bcm2835_audio");

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From: Stefan Wahren <stefan.wahren@i2se.com>
To: Eric Anholt <eric@anholt.net>, gregkh@linuxfoundation.org,
 Dave Stevenson <dave.stevenson@raspberrypi.org>
Subject: [PATCH RFC 10/11] staging: bcm2835-camera: Provide more specific
 probe error messages
Date: Thu, 25 Oct 2018 17:29:34 +0200
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Currently there is only a catch-all info message which print the
relevant error code without any context. So add more specific error
messages in order to narrow down possible issues.

Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
---
 .../vc04_services/bcm2835-camera/bcm2835-camera.c  | 58 +++++++++++++++-------
 1 file changed, 39 insertions(+), 19 deletions(-)

diff --git a/drivers/staging/vc04_services/bcm2835-camera/bcm2835-camera.c b/drivers/staging/vc04_services/bcm2835-camera/bcm2835-camera.c
index cd773eb..84ca22d 100644
--- a/drivers/staging/vc04_services/bcm2835-camera/bcm2835-camera.c
+++ b/drivers/staging/vc04_services/bcm2835-camera/bcm2835-camera.c
@@ -1539,8 +1539,11 @@ static int mmal_init(struct bm2835_mmal_dev *dev)
 	struct vchiq_mmal_component  *camera;
 
 	ret = vchiq_mmal_init(&dev->instance);
-	if (ret < 0)
+	if (ret < 0) {
+		v4l2_err(&dev->v4l2_dev, "%s: vchiq mmal init failed %d\n",
+			 __func__, ret);
 		return ret;
+	}
 
 	/* get the camera component ready */
 	ret = vchiq_mmal_component_init(dev->instance, "ril.camera",
@@ -1549,7 +1552,9 @@ static int mmal_init(struct bm2835_mmal_dev *dev)
 		goto unreg_mmal;
 
 	camera = dev->component[MMAL_COMPONENT_CAMERA];
-	if (camera->outputs <  MMAL_CAMERA_PORT_COUNT) {
+	if (camera->outputs < MMAL_CAMERA_PORT_COUNT) {
+		v4l2_err(&dev->v4l2_dev, "%s: too few camera outputs %d needed %d\n",
+			 __func__, camera->outputs, MMAL_CAMERA_PORT_COUNT);
 		ret = -EINVAL;
 		goto unreg_camera;
 	}
@@ -1557,8 +1562,11 @@ static int mmal_init(struct bm2835_mmal_dev *dev)
 	ret = set_camera_parameters(dev->instance,
 				    camera,
 				    dev);
-	if (ret < 0)
+	if (ret < 0) {
+		v4l2_err(&dev->v4l2_dev, "%s: unable to set camera parameters: %d\n",
+			 __func__, ret);
 		goto unreg_camera;
+	}
 
 	/* There was an error in the firmware that meant the camera component
 	 * produced BGR instead of RGB.
@@ -1647,8 +1655,8 @@ static int mmal_init(struct bm2835_mmal_dev *dev)
 
 	if (dev->component[MMAL_COMPONENT_PREVIEW]->inputs < 1) {
 		ret = -EINVAL;
-		pr_debug("too few input ports %d needed %d\n",
-			 dev->component[MMAL_COMPONENT_PREVIEW]->inputs, 1);
+		v4l2_err(&dev->v4l2_dev, "%s: too few input ports %d needed %d\n",
+			 __func__, dev->component[MMAL_COMPONENT_PREVIEW]->inputs, 1);
 		goto unreg_preview;
 	}
 
@@ -1661,8 +1669,8 @@ static int mmal_init(struct bm2835_mmal_dev *dev)
 
 	if (dev->component[MMAL_COMPONENT_IMAGE_ENCODE]->inputs < 1) {
 		ret = -EINVAL;
-		v4l2_err(&dev->v4l2_dev, "too few input ports %d needed %d\n",
-			 dev->component[MMAL_COMPONENT_IMAGE_ENCODE]->inputs,
+		v4l2_err(&dev->v4l2_dev, "%s: too few input ports %d needed %d\n",
+			 __func__, dev->component[MMAL_COMPONENT_IMAGE_ENCODE]->inputs,
 			 1);
 		goto unreg_image_encoder;
 	}
@@ -1676,8 +1684,8 @@ static int mmal_init(struct bm2835_mmal_dev *dev)
 
 	if (dev->component[MMAL_COMPONENT_VIDEO_ENCODE]->inputs < 1) {
 		ret = -EINVAL;
-		v4l2_err(&dev->v4l2_dev, "too few input ports %d needed %d\n",
-			 dev->component[MMAL_COMPONENT_VIDEO_ENCODE]->inputs,
+		v4l2_err(&dev->v4l2_dev, "%s: too few input ports %d needed %d\n",
+			 __func__, dev->component[MMAL_COMPONENT_VIDEO_ENCODE]->inputs,
 			 1);
 		goto unreg_vid_encoder;
 	}
@@ -1706,8 +1714,11 @@ static int mmal_init(struct bm2835_mmal_dev *dev)
 					      sizeof(enable));
 	}
 	ret = bm2835_mmal_set_all_camera_controls(dev);
-	if (ret < 0)
+	if (ret < 0) {
+		v4l2_err(&dev->v4l2_dev, "%s: failed to set all camera controls: %d\n",
+			 __func__, ret);
 		goto unreg_vid_encoder;
+	}
 
 	return 0;
 
@@ -1873,21 +1884,29 @@ static int bcm2835_mmal_probe(struct platform_device *pdev)
 		snprintf(dev->v4l2_dev.name, sizeof(dev->v4l2_dev.name),
 			 "%s", BM2835_MMAL_MODULE_NAME);
 		ret = v4l2_device_register(NULL, &dev->v4l2_dev);
-		if (ret)
+		if (ret) {
+			dev_err(&pdev->dev, "%s: could not register V4L2 device: %d\n",
+				__func__, ret);
 			goto free_dev;
+		}
 
 		/* setup v4l controls */
 		ret = bm2835_mmal_init_controls(dev, &dev->ctrl_handler);
-		if (ret < 0)
+		if (ret < 0) {
+			v4l2_err(&dev->v4l2_dev, "%s: could not init controls: %d\n",
+				__func__, ret);
 			goto unreg_dev;
+		}
 		dev->v4l2_dev.ctrl_handler = &dev->ctrl_handler;
 
 		/* mmal init */
 		dev->instance = instance;
 		ret = mmal_init(dev);
-		if (ret < 0)
+		if (ret < 0) {
+			v4l2_err(&dev->v4l2_dev, "%s: mmal init failed: %d\n",
+				 __func__, ret);
 			goto unreg_dev;
-
+		}
 		/* initialize queue */
 		q = &dev->capture.vb_vidq;
 		memset(q, 0, sizeof(*q));
@@ -1905,16 +1924,19 @@ static int bcm2835_mmal_probe(struct platform_device *pdev)
 
 		/* initialise video devices */
 		ret = bm2835_mmal_init_device(dev, &dev->vdev);
-		if (ret < 0)
+		if (ret < 0) {
+			v4l2_err(&dev->v4l2_dev, "%s: could not init device: %d\n",
+				 __func__, ret);
 			goto unreg_dev;
+		}
 
 		/* Really want to call vidioc_s_fmt_vid_cap with the default
 		 * format, but currently the APIs don't join up.
 		 */
 		ret = mmal_setup_components(dev, &default_v4l2_format);
 		if (ret < 0) {
-			v4l2_err(&dev->v4l2_dev,
-				 "%s: could not setup components\n", __func__);
+			v4l2_err(&dev->v4l2_dev, "%s: could not setup components: %d\n",
+				 __func__, ret);
 			goto unreg_dev;
 		}
 
@@ -1938,8 +1960,6 @@ static int bcm2835_mmal_probe(struct platform_device *pdev)
 		bcm2835_cleanup_instance(gdev[i]);
 		gdev[i] = NULL;
 	}
-	pr_info("%s: error %d while loading driver\n",
-		BM2835_MMAL_MODULE_NAME, ret);
 
 cleanup_mmal:
 	vchiq_mmal_finalise(instance);

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From: Stefan Wahren <stefan.wahren@i2se.com>
To: Eric Anholt <eric@anholt.net>, gregkh@linuxfoundation.org,
 Dave Stevenson <dave.stevenson@raspberrypi.org>
Subject: [PATCH RFC 11/11] staging: bcm2835-camera: Add hint about possible
 faulty config
Date: Thu, 25 Oct 2018 17:29:35 +0200
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As per default the GPU memory config of the Raspberry Pi isn't sufficient
for the camera usage. Even worse the bcm2835 camera driver doesn't provide a
helpful error message in this case. So let's add a hint to point the user
to the likely cause.

Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
---
 drivers/staging/vc04_services/bcm2835-camera/mmal-vchiq.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/staging/vc04_services/bcm2835-camera/mmal-vchiq.c b/drivers/staging/vc04_services/bcm2835-camera/mmal-vchiq.c
index cc2d993..bffd75d 100644
--- a/drivers/staging/vc04_services/bcm2835-camera/mmal-vchiq.c
+++ b/drivers/staging/vc04_services/bcm2835-camera/mmal-vchiq.c
@@ -1623,8 +1623,11 @@ int vchiq_mmal_component_init(struct vchiq_mmal_instance *instance,
 	component = &instance->component[instance->component_idx];
 
 	ret = create_component(instance, component, name);
-	if (ret < 0)
+	if (ret < 0) {
+		pr_err("%s: failed to create component %d (Not enough GPU mem?)\n",
+		       __func__, ret);
 		goto unlock;
+	}
 
 	/* ports info needs gathering */
 	component->control.type = MMAL_PORT_TYPE_CONTROL;