apm821xx: add support for kernel 5.15 for testing

This patch copies over refreshed config and patches from 5.10
with the following changes:

 - dropped superfluous tc654/tc655 variant detection patch
   (tc654 support will become available upstream starting with
   5.17-rc7+).

 - dropped xhci msi(x) workaround... as the broken MSI(X)
   is now gone.

 - dropped dwc2 workaround since the driver was fixed and it
   works without it.

Please note: Netgear WNDAP660 & WNDAP620 users:

Due to the kernel's size increase, uboot will likely break
because it is overwrite the kernel during decompression.

To fix this (and debrick affected devices, no reflash
necessary), attach the RJ45-Serial-Console cable and
enter the following in the uboot prompt during bootup:

 setenv kernel_addr_r 1100000
 saveenv
 run bootcmd

to restore the old/previous behavior:

 setenv kernel_addr_r 600000
 saveenv
 run bootcmd

Signed-off-by: Christian Lamparter <chunkeey@gmail.com>

1 files changed, 166 insertions, 0 deletions

diff --git a/target/linux/apm821xx/patches-5.15/010-hwmon-tc654-add-thermal_cooling-device.patch b/target/linux/apm821xx/patches-5.15/010-hwmon-tc654-add-thermal_cooling-device.patch
new file mode 100644
index 0000000000..74f8e38150
--- /dev/null
+++ b/target/linux/apm821xx/patches-5.15/010-hwmon-tc654-add-thermal_cooling-device.patch
@@ -0,0 +1,166 @@
+From 4d49367c5303e3ebd17502a45b74de280f6be539 Mon Sep 17 00:00:00 2001
+From: Christian Lamparter <chunkeey@gmail.com>
+Date: Sun, 13 Feb 2022 01:47:33 +0100
+Subject: hwmon: (tc654) Add thermal_cooling device support
+
+Adds thermal_cooling device support to the tc654/tc655
+driver. This make it possible to integrate it into a
+device-tree supported thermal-zone node as a
+cooling device.
+
+I have been using this patch as part of the Netgear WNDR4700
+Centria NAS Router support within OpenWrt since 2016.
+
+Signed-off-by: Christian Lamparter <chunkeey@gmail.com>
+Link: https://lore.kernel.org/r/20220213004733.2421193-1-chunkeey@gmail.com
+Signed-off-by: Guenter Roeck <linux@roeck-us.net>
+---
+--- a/drivers/hwmon/tc654.c
++++ b/drivers/hwmon/tc654.c
+@@ -15,6 +15,7 @@
+ #include <linux/module.h>
+ #include <linux/mutex.h>
+ #include <linux/slab.h>
++#include <linux/thermal.h>
+ #include <linux/util_macros.h>
+ 
+ enum tc654_regs {
+@@ -379,28 +380,20 @@ static ssize_t pwm_show(struct device *d
+ 	return sprintf(buf, "%d\n", pwm);
+ }
+ 
+-static ssize_t pwm_store(struct device *dev, struct device_attribute *da,
+-			 const char *buf, size_t count)
++static int _set_pwm(struct tc654_data *data, unsigned long val)
+ {
+-	struct tc654_data *data = dev_get_drvdata(dev);
+ 	struct i2c_client *client = data->client;
+-	unsigned long val;
+ 	int ret;
+ 
+-	if (kstrtoul(buf, 10, &val))
+-		return -EINVAL;
+-	if (val > 255)
+-		return -EINVAL;
+-
+ 	mutex_lock(&data->update_lock);
+ 
+-	if (val == 0)
++	if (val == 0) {
+ 		data->config |= TC654_REG_CONFIG_SDM;
+-	else
++		data->duty_cycle = 0;
++	} else {
+ 		data->config &= ~TC654_REG_CONFIG_SDM;
+-
+-	data->duty_cycle = find_closest(val, tc654_pwm_map,
+-					ARRAY_SIZE(tc654_pwm_map));
++		data->duty_cycle = val - 1;
++	}
+ 
+ 	ret = i2c_smbus_write_byte_data(client, TC654_REG_CONFIG, data->config);
+ 	if (ret < 0)
+@@ -411,6 +404,24 @@ static ssize_t pwm_store(struct device *
+ 
+ out:
+ 	mutex_unlock(&data->update_lock);
++	return ret;
++}
++
++static ssize_t pwm_store(struct device *dev, struct device_attribute *da,
++			 const char *buf, size_t count)
++{
++	struct tc654_data *data = dev_get_drvdata(dev);
++	unsigned long val;
++	int ret;
++
++	if (kstrtoul(buf, 10, &val))
++		return -EINVAL;
++	if (val > 255)
++		return -EINVAL;
++	if (val > 0)
++		val = find_closest(val, tc654_pwm_map, ARRAY_SIZE(tc654_pwm_map)) + 1;
++
++	ret = _set_pwm(data, val);
+ 	return ret < 0 ? ret : count;
+ }
+ 
+@@ -443,6 +454,58 @@ static struct attribute *tc654_attrs[] =
+ ATTRIBUTE_GROUPS(tc654);
+ 
+ /*
++ * thermal cooling device functions
++ *
++ * Account for the "ShutDown Mode (SDM)" state by offsetting
++ * the 16 PWM duty cycle states by 1.
++ *
++ * State  0 =   0% PWM | Shutdown - Fan(s) are off
++ * State  1 =  30% PWM | duty_cycle =  0
++ * State  2 = ~35% PWM | duty_cycle =  1
++ * [...]
++ * State 15 = ~95% PWM | duty_cycle = 14
++ * State 16 = 100% PWM | duty_cycle = 15
++ */
++#define TC654_MAX_COOLING_STATE	16
++
++static int tc654_get_max_state(struct thermal_cooling_device *cdev, unsigned long *state)
++{
++	*state = TC654_MAX_COOLING_STATE;
++	return 0;
++}
++
++static int tc654_get_cur_state(struct thermal_cooling_device *cdev, unsigned long *state)
++{
++	struct tc654_data *data = tc654_update_client(cdev->devdata);
++
++	if (IS_ERR(data))
++		return PTR_ERR(data);
++
++	if (data->config & TC654_REG_CONFIG_SDM)
++		*state = 0;	/* FAN is off */
++	else
++		*state = data->duty_cycle + 1;	/* offset PWM States by 1 */
++
++	return 0;
++}
++
++static int tc654_set_cur_state(struct thermal_cooling_device *cdev, unsigned long state)
++{
++	struct tc654_data *data = tc654_update_client(cdev->devdata);
++
++	if (IS_ERR(data))
++		return PTR_ERR(data);
++
++	return _set_pwm(data, clamp_val(state, 0, TC654_MAX_COOLING_STATE));
++}
++
++static const struct thermal_cooling_device_ops tc654_fan_cool_ops = {
++	.get_max_state = tc654_get_max_state,
++	.get_cur_state = tc654_get_cur_state,
++	.set_cur_state = tc654_set_cur_state,
++};
++
++/*
+  * device probe and removal
+  */
+ 
+@@ -472,7 +535,18 @@ static int tc654_probe(struct i2c_client
+ 	hwmon_dev =
+ 	    devm_hwmon_device_register_with_groups(dev, client->name, data,
+ 						   tc654_groups);
+-	return PTR_ERR_OR_ZERO(hwmon_dev);
++	if (IS_ERR(hwmon_dev))
++		return PTR_ERR(hwmon_dev);
++
++	if (IS_ENABLED(CONFIG_THERMAL)) {
++		struct thermal_cooling_device *cdev;
++
++		cdev = devm_thermal_of_cooling_device_register(dev, dev->of_node, client->name,
++							       hwmon_dev, &tc654_fan_cool_ops);
++		return PTR_ERR_OR_ZERO(cdev);
++	}
++
++	return 0;
+ }
+ 
+ static const struct i2c_device_id tc654_id[] = {