brcm2708: update to latest patches from RPi Foundation

[openwrt/staging/wigyori.git] / target / linux / brcm2708 / patches-4.19 / 950-0136-hwmon-raspberrypi-Prevent-voltage-low-warnings-from-.patch

diff --git a/target/linux/brcm2708/patches-4.19/950-0136-hwmon-raspberrypi-Prevent-voltage-low-warnings-from-.patch b/target/linux/brcm2708/patches-4.19/950-0136-hwmon-raspberrypi-Prevent-voltage-low-warnings-from-.patch
new file mode 100644 (file)
index 0000000..ea9846d
--- /dev/null
+++ b/target/linux/brcm2708/patches-4.19/950-0136-hwmon-raspberrypi-Prevent-voltage-low-warnings-from-.patch
@@ -0,0 +1,75 @@
+From e7056be388c7bbc6f0211f587643ff795ce30814 Mon Sep 17 00:00:00 2001
+From: Stefan Wahren <stefan.wahren@i2se.com>
+Date: Sat, 6 Oct 2018 16:46:18 +0200
+Subject: [PATCH] hwmon: raspberrypi: Prevent voltage low warnings from
+ filling log
+
+Although the correct fix for low voltage warnings is to
+improve the power supply, the current implementation
+of the detection can fill the log if the warning
+happens freqently. This replaces the logging with
+slightly custom ratelimited logging.
+
+Signed-off-by: James Hughes <james.hughes@raspberrypi.org>
+Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
+---
+ drivers/hwmon/raspberrypi-hwmon.c | 41 ++++++++++++++++++++++++++++---
+ 1 file changed, 37 insertions(+), 4 deletions(-)
+
+--- a/drivers/hwmon/raspberrypi-hwmon.c
++++ b/drivers/hwmon/raspberrypi-hwmon.c
+@@ -15,6 +15,36 @@
+ #include <linux/workqueue.h>
+ #include <soc/bcm2835/raspberrypi-firmware.h>
+ 
++/*
++ * This section defines some rate limited logging that prevent
++ * repeated messages at much lower Hz than the default kernel settings.
++ * It's usually 5s, this is 5 minutes.
++ * Burst 3 means you may get three messages 'quickly', before
++ * the ratelimiting kicks in.
++ */
++#define LOCAL_RATELIMIT_INTERVAL (5 * 60 * HZ)
++#define LOCAL_RATELIMIT_BURST 3
++
++#ifdef CONFIG_PRINTK
++#define printk_ratelimited_local(fmt, ...)    \
++({                                            \
++      static DEFINE_RATELIMIT_STATE(_rs,      \
++              LOCAL_RATELIMIT_INTERVAL,       \
++              LOCAL_RATELIMIT_BURST);         \
++                                              \
++      if (__ratelimit(&_rs))                  \
++              printk(fmt, ##__VA_ARGS__);     \
++})
++#else
++#define printk_ratelimited_local(fmt, ...)    \
++      no_printk(fmt, ##__VA_ARGS__)
++#endif
++
++#define pr_crit_ratelimited_local(fmt, ...)              \
++      printk_ratelimited_local(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__)
++#define pr_info_ratelimited_local(fmt, ...)              \
++printk_ratelimited_local(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
++
+ #define UNDERVOLTAGE_STICKY_BIT       BIT(16)
+ 
+ struct rpi_hwmon_data {
+@@ -47,10 +77,13 @@ static void rpi_firmware_get_throttled(s
+       if (new_uv == old_uv)
+               return;
+ 
+-      if (new_uv)
+-              dev_crit(data->hwmon_dev, "Undervoltage detected!\n");
+-      else
+-              dev_info(data->hwmon_dev, "Voltage normalised\n");
++      if (new_uv) {
++              pr_crit_ratelimited_local("Under-voltage detected! (0x%08x)\n",
++                                        value);
++      } else {
++              pr_info_ratelimited_local("Voltage normalised (0x%08x)\n",
++                                        value);
++      }
+ 
+       sysfs_notify(&data->hwmon_dev->kobj, NULL, "in0_lcrit_alarm");
+ }