bcm27xx: import latest patches from the RPi foundation

bcm2708: boot tested on RPi B+ v1.2
bcm2709: boot tested on RPi 3B v1.2 and RPi 4B v1.1 4G
bcm2710: boot tested on RPi 3B v1.2
bcm2711: boot tested on RPi 4B v1.1 4G

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

1 files changed, 580 insertions, 0 deletions

diff --git a/target/linux/bcm27xx/patches-5.4/950-0766-w1_therm-adding-code-comments-and-code-reordering.patch b/target/linux/bcm27xx/patches-5.4/950-0766-w1_therm-adding-code-comments-and-code-reordering.patch
new file mode 100644
index 0000000000..5db05123da
--- /dev/null
+++ b/target/linux/bcm27xx/patches-5.4/950-0766-w1_therm-adding-code-comments-and-code-reordering.patch
@@ -0,0 +1,580 @@
+From 7c49e87acd0412ff1fb2490c4ac6fcb5471afd9b Mon Sep 17 00:00:00 2001
+From: Akira Shimahara <akira215corp@gmail.com>
+Date: Mon, 11 May 2020 22:35:35 +0200
+Subject: [PATCH] w1_therm: adding code comments and code reordering
+
+commit 92b8d2724464bc1d2e735a84c0da5741dce33485 upstream.
+
+Adding code comments to split code in dedicated parts. After the global
+declarations (defines, macros and function declarations), code is organized
+as follow :
+ - Device and family dependent structures and functions
+ - Interfaces functions
+ - Helpers functions
+ - Hardware functions
+ - Sysfs interface functions
+
+Signed-off-by: Akira Shimahara <akira215corp@gmail.com>
+Link: https://lore.kernel.org/r/20200511203535.409599-1-akira215corp@gmail.com
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ drivers/w1/slaves/w1_therm.c | 427 +++++++++++++++++++++--------------
+ 1 file changed, 259 insertions(+), 168 deletions(-)
+
+--- a/drivers/w1/slaves/w1_therm.c
++++ b/drivers/w1/slaves/w1_therm.c
+@@ -25,7 +25,8 @@
+ #define W1_THERM_DS1825		0x3B
+ #define W1_THERM_DS28EA00	0x42
+ 
+-/* Allow the strong pullup to be disabled, but default to enabled.
++/*
++ * Allow the strong pullup to be disabled, but default to enabled.
+  * If it was disabled a parasite powered device might not get the require
+  * current to do a temperature conversion.  If it is enabled parasite powered
+  * devices have a better chance of getting the current required.
+@@ -41,42 +42,55 @@
+ static int w1_strong_pullup = 1;
+ module_param_named(strong_pullup, w1_strong_pullup, int, 0);
+ 
++/* Helpers Macros */
++
++/* return the address of the refcnt in the family data */
++#define THERM_REFCNT(family_data) \
++	(&((struct w1_therm_family_data *)family_data)->refcnt)
++
++/* Structs definition */
++
++/**
++ * struct w1_therm_family_converter - bind device specific functions
++ * @broken: flag for non-registred families
++ * @reserved: not used here
++ * @f: pointer to the device binding structure
++ * @convert: pointer to the device conversion function
++ * @precision: pointer to the device precision function
++ * @eeprom: pointer to eeprom function
++ */
++struct w1_therm_family_converter {
++	u8		broken;
++	u16		reserved;
++	struct w1_family	*f;
++	int		(*convert)(u8 rom[9]);
++	int		(*precision)(struct device *device, int val);
++	int		(*eeprom)(struct device *device);
++};
++
++/**
++ * struct w1_therm_family_data - device data
++ * @rom: ROM device id (64bit Lasered ROM code + 1 CRC byte)
++ * @refcnt: ref count
++ */
+ struct w1_therm_family_data {
+ 	uint8_t rom[9];
+ 	atomic_t refcnt;
+ };
+ 
++/**
++ * struct therm_info - store temperature reading
++ * @rom: read device data (8 data bytes + 1 CRC byte)
++ * @crc: computed crc from rom
++ * @verdict: 1 crc checked, 0 crc not matching
++ */
+ struct therm_info {
+ 	u8 rom[9];
+ 	u8 crc;
+ 	u8 verdict;
+ };
+ 
+-/* return the address of the refcnt in the family data */
+-#define THERM_REFCNT(family_data) \
+-	(&((struct w1_therm_family_data *)family_data)->refcnt)
+-
+-static int w1_therm_add_slave(struct w1_slave *sl)
+-{
+-	sl->family_data = kzalloc(sizeof(struct w1_therm_family_data),
+-		GFP_KERNEL);
+-	if (!sl->family_data)
+-		return -ENOMEM;
+-	atomic_set(THERM_REFCNT(sl->family_data), 1);
+-	return 0;
+-}
+-
+-static void w1_therm_remove_slave(struct w1_slave *sl)
+-{
+-	int refcnt = atomic_sub_return(1, THERM_REFCNT(sl->family_data));
+-
+-	while (refcnt) {
+-		msleep(1000);
+-		refcnt = atomic_read(THERM_REFCNT(sl->family_data));
+-	}
+-	kfree(sl->family_data);
+-	sl->family_data = NULL;
+-}
++/* Sysfs interface declaration */
+ 
+ static ssize_t w1_slave_show(struct device *device,
+ 	struct device_attribute *attr, char *buf);
+@@ -87,9 +101,35 @@ static ssize_t w1_slave_store(struct dev
+ static ssize_t w1_seq_show(struct device *device,
+ 	struct device_attribute *attr, char *buf);
+ 
++/* Attributes declarations */
++
+ static DEVICE_ATTR_RW(w1_slave);
+ static DEVICE_ATTR_RO(w1_seq);
+ 
++/* Interface Functions declaration */
++
++/**
++ * w1_therm_add_slave() - Called when a new slave is discovered
++ * @sl: slave just discovered by the master.
++ *
++ * Called by the master when the slave is discovered on the bus. Used to
++ * initialize slave state before the beginning of any communication.
++ *
++ * Return: 0 - If success, negative kernel code otherwise
++ */
++static int w1_therm_add_slave(struct w1_slave *sl);
++
++/**
++ * w1_therm_remove_slave() - Called when a slave is removed
++ * @sl: slave to be removed.
++ *
++ * Called by the master when the slave is considered not to be on the bus
++ * anymore. Used to free memory.
++ */
++static void w1_therm_remove_slave(struct w1_slave *sl);
++
++/* Family attributes */
++
+ static struct attribute *w1_therm_attrs[] = {
+ 	&dev_attr_w1_slave.attr,
+ 	NULL,
+@@ -101,6 +141,8 @@ static struct attribute *w1_ds28ea00_att
+ 	NULL,
+ };
+ 
++/* Attribute groups */
++
+ ATTRIBUTE_GROUPS(w1_therm);
+ ATTRIBUTE_GROUPS(w1_ds28ea00);
+ 
+@@ -154,6 +196,8 @@ static const struct hwmon_chip_info w1_c
+ #define W1_CHIPINFO	NULL
+ #endif
+ 
++/* Family operations */
++
+ static struct w1_family_ops w1_therm_fops = {
+ 	.add_slave	= w1_therm_add_slave,
+ 	.remove_slave	= w1_therm_remove_slave,
+@@ -168,6 +212,8 @@ static struct w1_family_ops w1_ds28ea00_
+ 	.chip_info	= W1_CHIPINFO,
+ };
+ 
++/* Family binding operations struct */
++
+ static struct w1_family w1_therm_family_DS18S20 = {
+ 	.fid = W1_THERM_DS18S20,
+ 	.fops = &w1_therm_fops,
+@@ -193,138 +239,18 @@ static struct w1_family w1_therm_family_
+ 	.fops = &w1_therm_fops,
+ };
+ 
+-struct w1_therm_family_converter {
+-	u8			broken;
+-	u16			reserved;
+-	struct w1_family	*f;
+-	int			(*convert)(u8 rom[9]);
+-	int			(*precision)(struct device *device, int val);
+-	int			(*eeprom)(struct device *device);
+-};
++/* Device dependent func */
+ 
+ /* write configuration to eeprom */
+ static inline int w1_therm_eeprom(struct device *device);
+ 
+-/* Set precision for conversion */
+-static inline int w1_DS18B20_precision(struct device *device, int val);
+-static inline int w1_DS18S20_precision(struct device *device, int val);
+-
+-/* The return value is millidegrees Centigrade. */
+-static inline int w1_DS18B20_convert_temp(u8 rom[9]);
+-static inline int w1_DS18S20_convert_temp(u8 rom[9]);
+-
+-static struct w1_therm_family_converter w1_therm_families[] = {
+-	{
+-		.f		= &w1_therm_family_DS18S20,
+-		.convert	= w1_DS18S20_convert_temp,
+-		.precision	= w1_DS18S20_precision,
+-		.eeprom		= w1_therm_eeprom
+-	},
+-	{
+-		.f		= &w1_therm_family_DS1822,
+-		.convert	= w1_DS18B20_convert_temp,
+-		.precision	= w1_DS18S20_precision,
+-		.eeprom		= w1_therm_eeprom
+-	},
+-	{
+-		.f		= &w1_therm_family_DS18B20,
+-		.convert	= w1_DS18B20_convert_temp,
+-		.precision	= w1_DS18B20_precision,
+-		.eeprom		= w1_therm_eeprom
+-	},
+-	{
+-		.f		= &w1_therm_family_DS28EA00,
+-		.convert	= w1_DS18B20_convert_temp,
+-		.precision	= w1_DS18S20_precision,
+-		.eeprom		= w1_therm_eeprom
+-	},
+-	{
+-		.f		= &w1_therm_family_DS1825,
+-		.convert	= w1_DS18B20_convert_temp,
+-		.precision	= w1_DS18S20_precision,
+-		.eeprom		= w1_therm_eeprom
+-	}
+-};
+-
+-static inline int w1_therm_eeprom(struct device *device)
+-{
+-	struct w1_slave *sl = dev_to_w1_slave(device);
+-	struct w1_master *dev = sl->master;
+-	u8 rom[9], external_power;
+-	int ret, max_trying = 10;
+-	u8 *family_data = sl->family_data;
+-
+-	if (!sl->family_data) {
+-		ret = -ENODEV;
+-		goto error;
+-	}
+-
+-	/* prevent the slave from going away in sleep */
+-	atomic_inc(THERM_REFCNT(family_data));
+-
+-	ret = mutex_lock_interruptible(&dev->bus_mutex);
+-	if (ret != 0)
+-		goto dec_refcnt;
+-
+-	memset(rom, 0, sizeof(rom));
+-
+-	while (max_trying--) {
+-		if (!w1_reset_select_slave(sl)) {
+-			unsigned int tm = 10;
+-			unsigned long sleep_rem;
+-
+-			/* check if in parasite mode */
+-			w1_write_8(dev, W1_READ_PSUPPLY);
+-			external_power = w1_read_8(dev);
+-
+-			if (w1_reset_select_slave(sl))
+-				continue;
+-
+-			/* 10ms strong pullup/delay after the copy command */
+-			if (w1_strong_pullup == 2 ||
+-			    (!external_power && w1_strong_pullup))
+-				w1_next_pullup(dev, tm);
+-
+-			w1_write_8(dev, W1_COPY_SCRATCHPAD);
+-
+-			if (external_power) {
+-				mutex_unlock(&dev->bus_mutex);
+-
+-				sleep_rem = msleep_interruptible(tm);
+-				if (sleep_rem != 0) {
+-					ret = -EINTR;
+-					goto dec_refcnt;
+-				}
+-
+-				ret = mutex_lock_interruptible(&dev->bus_mutex);
+-				if (ret != 0)
+-					goto dec_refcnt;
+-			} else if (!w1_strong_pullup) {
+-				sleep_rem = msleep_interruptible(tm);
+-				if (sleep_rem != 0) {
+-					ret = -EINTR;
+-					goto mt_unlock;
+-				}
+-			}
+-
+-			break;
+-		}
+-	}
+-
+-mt_unlock:
+-	mutex_unlock(&dev->bus_mutex);
+-dec_refcnt:
+-	atomic_dec(THERM_REFCNT(family_data));
+-error:
+-	return ret;
+-}
+-
+ /* DS18S20 does not feature configuration register */
+ static inline int w1_DS18S20_precision(struct device *device, int val)
+ {
+ 	return 0;
+ }
+ 
++/* Set precision for conversion */
+ static inline int w1_DS18B20_precision(struct device *device, int val)
+ {
+ 	struct w1_slave *sl = dev_to_w1_slave(device);
+@@ -407,6 +333,14 @@ error:
+ 	return ret;
+ }
+ 
++/**
++ * w1_DS18B20_convert_temp() - temperature computation for DS18B20
++ * @rom: data read from device RAM (8 data bytes + 1 CRC byte)
++ *
++ * Can be called for any DS18B20 compliant device.
++ *
++ * Return: value in millidegrees Celsius.
++ */
+ static inline int w1_DS18B20_convert_temp(u8 rom[9])
+ {
+ 	s16 t = le16_to_cpup((__le16 *)rom);
+@@ -414,6 +348,14 @@ static inline int w1_DS18B20_convert_tem
+ 	return t*1000/16;
+ }
+ 
++/**
++ * w1_DS18S20_convert_temp() - temperature computation for DS18S20
++ * @rom: data read from device RAM (8 data bytes + 1 CRC byte)
++ *
++ * Can be called for any DS18S20 compliant device.
++ *
++ * Return: value in millidegrees Celsius.
++ */
+ static inline int w1_DS18S20_convert_temp(u8 rom[9])
+ {
+ 	int t, h;
+@@ -434,6 +376,53 @@ static inline int w1_DS18S20_convert_tem
+ 	return t;
+ }
+ 
++/* Device capability description */
++
++static struct w1_therm_family_converter w1_therm_families[] = {
++	{
++		.f		= &w1_therm_family_DS18S20,
++		.convert	= w1_DS18S20_convert_temp,
++		.precision	= w1_DS18S20_precision,
++		.eeprom		= w1_therm_eeprom
++	},
++	{
++		.f		= &w1_therm_family_DS1822,
++		.convert	= w1_DS18B20_convert_temp,
++		.precision	= w1_DS18S20_precision,
++		.eeprom		= w1_therm_eeprom
++	},
++	{
++		.f		= &w1_therm_family_DS18B20,
++		.convert	= w1_DS18B20_convert_temp,
++		.precision	= w1_DS18B20_precision,
++		.eeprom		= w1_therm_eeprom
++	},
++	{
++		.f		= &w1_therm_family_DS28EA00,
++		.convert	= w1_DS18B20_convert_temp,
++		.precision	= w1_DS18S20_precision,
++		.eeprom		= w1_therm_eeprom
++	},
++	{
++		.f		= &w1_therm_family_DS1825,
++		.convert	= w1_DS18B20_convert_temp,
++		.precision	= w1_DS18S20_precision,
++		.eeprom		= w1_therm_eeprom
++	}
++};
++
++/* Helpers Functions */
++
++/**
++ * w1_convert_temp() - temperature conversion binding function
++ * @rom: data read from device RAM (8 data bytes + 1 CRC byte)
++ * @fid: device family id
++ *
++ * The function call the temperature computation function according to
++ * device family.
++ *
++ * Return: value in millidegrees Celsius.
++ */
+ static inline int w1_convert_temp(u8 rom[9], u8 fid)
+ {
+ 	int i;
+@@ -445,31 +434,32 @@ static inline int w1_convert_temp(u8 rom
+ 	return 0;
+ }
+ 
+-static ssize_t w1_slave_store(struct device *device,
+-			      struct device_attribute *attr, const char *buf,
+-			      size_t size)
++/* Interface Functions */
++
++static int w1_therm_add_slave(struct w1_slave *sl)
+ {
+-	int val, ret;
+-	struct w1_slave *sl = dev_to_w1_slave(device);
+-	int i;
++	sl->family_data = kzalloc(sizeof(struct w1_therm_family_data),
++		GFP_KERNEL);
++	if (!sl->family_data)
++		return -ENOMEM;
++	atomic_set(THERM_REFCNT(sl->family_data), 1);
++	return 0;
++}
+ 
+-	ret = kstrtoint(buf, 0, &val);
+-	if (ret)
+-		return ret;
++static void w1_therm_remove_slave(struct w1_slave *sl)
++{
++	int refcnt = atomic_sub_return(1, THERM_REFCNT(sl->family_data));
+ 
+-	for (i = 0; i < ARRAY_SIZE(w1_therm_families); ++i) {
+-		if (w1_therm_families[i].f->fid == sl->family->fid) {
+-			/* zero value indicates to write current configuration to eeprom */
+-			if (val == 0)
+-				ret = w1_therm_families[i].eeprom(device);
+-			else
+-				ret = w1_therm_families[i].precision(device, val);
+-			break;
+-		}
++	while (refcnt) {
++		msleep(1000);
++		refcnt = atomic_read(THERM_REFCNT(sl->family_data));
+ 	}
+-	return ret ? : size;
++	kfree(sl->family_data);
++	sl->family_data = NULL;
+ }
+ 
++/* Hardware Functions */
++
+ static ssize_t read_therm(struct device *device,
+ 			  struct w1_slave *sl, struct therm_info *info)
+ {
+@@ -564,6 +554,81 @@ error:
+ 	return ret;
+ }
+ 
++static inline int w1_therm_eeprom(struct device *device)
++{
++	struct w1_slave *sl = dev_to_w1_slave(device);
++	struct w1_master *dev = sl->master;
++	u8 rom[9], external_power;
++	int ret, max_trying = 10;
++	u8 *family_data = sl->family_data;
++
++	if (!sl->family_data) {
++		ret = -ENODEV;
++		goto error;
++	}
++
++	/* prevent the slave from going away in sleep */
++	atomic_inc(THERM_REFCNT(family_data));
++
++	ret = mutex_lock_interruptible(&dev->bus_mutex);
++	if (ret != 0)
++		goto dec_refcnt;
++
++	memset(rom, 0, sizeof(rom));
++
++	while (max_trying--) {
++		if (!w1_reset_select_slave(sl)) {
++			unsigned int tm = 10;
++			unsigned long sleep_rem;
++
++			/* check if in parasite mode */
++			w1_write_8(dev, W1_READ_PSUPPLY);
++			external_power = w1_read_8(dev);
++
++			if (w1_reset_select_slave(sl))
++				continue;
++
++			/* 10ms strong pullup/delay after the copy command */
++			if (w1_strong_pullup == 2 ||
++			    (!external_power && w1_strong_pullup))
++				w1_next_pullup(dev, tm);
++
++			w1_write_8(dev, W1_COPY_SCRATCHPAD);
++
++			if (external_power) {
++				mutex_unlock(&dev->bus_mutex);
++
++				sleep_rem = msleep_interruptible(tm);
++				if (sleep_rem != 0) {
++					ret = -EINTR;
++					goto dec_refcnt;
++				}
++
++				ret = mutex_lock_interruptible(&dev->bus_mutex);
++				if (ret != 0)
++					goto dec_refcnt;
++			} else if (!w1_strong_pullup) {
++				sleep_rem = msleep_interruptible(tm);
++				if (sleep_rem != 0) {
++					ret = -EINTR;
++					goto mt_unlock;
++				}
++			}
++
++			break;
++		}
++	}
++
++mt_unlock:
++	mutex_unlock(&dev->bus_mutex);
++dec_refcnt:
++	atomic_dec(THERM_REFCNT(family_data));
++error:
++	return ret;
++}
++
++/* Sysfs Interface definition */
++
+ static ssize_t w1_slave_show(struct device *device,
+ 			     struct device_attribute *attr, char *buf)
+ {
+@@ -597,6 +662,32 @@ static ssize_t w1_slave_show(struct devi
+ 	return ret;
+ }
+ 
++static ssize_t w1_slave_store(struct device *device,
++			      struct device_attribute *attr, const char *buf,
++			      size_t size)
++{
++	int val, ret;
++	struct w1_slave *sl = dev_to_w1_slave(device);
++	int i;
++
++	ret = kstrtoint(buf, 0, &val);
++	if (ret)
++		return ret;
++
++	for (i = 0; i < ARRAY_SIZE(w1_therm_families); ++i) {
++		if (w1_therm_families[i].f->fid == sl->family->fid) {
++	/* zero value indicates to write current configuration to eeprom */
++			if (val == 0)
++				ret = w1_therm_families[i].eeprom(device);
++			else
++				ret = w1_therm_families[i].precision(device,
++									val);
++			break;
++		}
++	}
++	return ret ? : size;
++}
++
+ #if IS_REACHABLE(CONFIG_HWMON)
+ static int w1_read_temp(struct device *device, u32 attr, int channel,
+ 			long *val)
+@@ -666,7 +757,7 @@ static ssize_t w1_seq_show(struct device
+ 	if (ack != W1_42_SUCCESS_CONFIRM_BYTE)
+ 		goto error;
+ 
+-	/* In case the bus fails to send 0xFF, limit*/
++	/* In case the bus fails to send 0xFF, limit */
+ 	for (i = 0; i <= 64; i++) {
+ 		if (w1_reset_bus(sl->master))
+ 			goto error;