Enhancements for Raspberrp Pi Camera

1 files changed, 1761 insertions, 0 deletions

diff --git a/bcm2835-vc04_services-Improve-driver-load-unload.patch b/bcm2835-vc04_services-Improve-driver-load-unload.patch
new file mode 100644
index 000000000..d4deeadec
--- /dev/null
+++ b/bcm2835-vc04_services-Improve-driver-load-unload.patch
@@ -0,0 +1,1761 @@
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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
+Date: Thu, 25 Oct 2018 17:29:26 +0200
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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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+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 03/11] staging: bcm2835-camera: Move module info to the
+ end
+Date: Thu, 25 Oct 2018 17:29:27 +0200
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+Cc: devel@driverdev.osuosl.org, Stefan Wahren <stefan.wahren@i2se.com>,
+ linux-arm-kernel@lists.infradead.org, tiwai@suse.de, mikebrady@eircom.net,
+ pbrobinson@gmail.com, nsaenzjulienne@suse.de,
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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");
+
+From patchwork Thu Oct 25 15:29:28 2018
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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 04/11] staging: vchiq_arm: Fix platform device
+ unregistration
+Date: Thu, 25 Oct 2018 17:29:28 +0200
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+Cc: devel@driverdev.osuosl.org, Stefan Wahren <stefan.wahren@i2se.com>,
+ linux-arm-kernel@lists.infradead.org, tiwai@suse.de, mikebrady@eircom.net,
+ pbrobinson@gmail.com, nsaenzjulienne@suse.de,
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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);
+
+From patchwork Thu Oct 25 15:29:29 2018
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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 05/11] staging: vchiq_arm: Fix camera device registration
+Date: Thu, 25 Oct 2018 17:29:29 +0200
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+Cc: devel@driverdev.osuosl.org, Stefan Wahren <stefan.wahren@i2se.com>,
+ linux-arm-kernel@lists.infradead.org, tiwai@suse.de, mikebrady@eircom.net,
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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;
+ 
+
+From patchwork Thu Oct 25 15:29:30 2018
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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 06/11] staging: vchiq_arm: Register a platform device for
+ audio
+Date: Thu, 25 Oct 2018 17:29:30 +0200
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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();
+
+From patchwork Thu Oct 25 15:29:31 2018
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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 07/11] staging: bcm2835-audio: Enable compile test
+Date: Thu, 25 Oct 2018 17:29:31 +0200
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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
+
+From patchwork Thu Oct 25 15:29:32 2018
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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
+Message-Id: <1540481375-15952-9-git-send-email-stefan.wahren@i2se.com>
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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");
+
+From patchwork Thu Oct 25 15:29:33 2018
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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 RFX 09/11] staging: bcm2835-audio: Drop DT dependency
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+Cc: devel@driverdev.osuosl.org, Stefan Wahren <stefan.wahren@i2se.com>,
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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");
+
+From patchwork Thu Oct 25 15:29:34 2018
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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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+Cc: devel@driverdev.osuosl.org, Stefan Wahren <stefan.wahren@i2se.com>,
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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);
+
+From patchwork Thu Oct 25 15:29:35 2018
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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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+Cc: devel@driverdev.osuosl.org, Stefan Wahren <stefan.wahren@i2se.com>,
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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;