mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-30 02:29:01 +00:00
a1383655cf
Tested on bcm2710 (Raspberry Pi 3B). Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
57 lines
1.6 KiB
Diff
57 lines
1.6 KiB
Diff
From c5bb7a9c84494071bbed123af04556f6bc76c56f Mon Sep 17 00:00:00 2001
|
|
From: Phil Elwell <phil@raspberrypi.org>
|
|
Date: Mon, 29 Oct 2018 14:45:45 +0000
|
|
Subject: [PATCH] Revert "rtc: pcf8523: properly handle oscillator stop
|
|
bit"
|
|
|
|
This reverts commit ede44c908d44b166a5b6bd7caacd105c2ff5a70f.
|
|
|
|
See: https://github.com/raspberrypi/firmware/issues/1065
|
|
|
|
Signed-off-by: Phil Elwell <phil@raspberrypi.org>
|
|
---
|
|
drivers/rtc/rtc-pcf8523.c | 25 ++++++++++++++++++++++---
|
|
1 file changed, 22 insertions(+), 3 deletions(-)
|
|
|
|
--- a/drivers/rtc/rtc-pcf8523.c
|
|
+++ b/drivers/rtc/rtc-pcf8523.c
|
|
@@ -209,8 +209,28 @@ static int pcf8523_rtc_read_time(struct
|
|
if (err < 0)
|
|
return err;
|
|
|
|
- if (regs[0] & REG_SECONDS_OS)
|
|
- return -EINVAL;
|
|
+ if (regs[0] & REG_SECONDS_OS) {
|
|
+ /*
|
|
+ * If the oscillator was stopped, try to clear the flag. Upon
|
|
+ * power-up the flag is always set, but if we cannot clear it
|
|
+ * the oscillator isn't running properly for some reason. The
|
|
+ * sensible thing therefore is to return an error, signalling
|
|
+ * that the clock cannot be assumed to be correct.
|
|
+ */
|
|
+
|
|
+ regs[0] &= ~REG_SECONDS_OS;
|
|
+
|
|
+ err = pcf8523_write(client, REG_SECONDS, regs[0]);
|
|
+ if (err < 0)
|
|
+ return err;
|
|
+
|
|
+ err = pcf8523_read(client, REG_SECONDS, ®s[0]);
|
|
+ if (err < 0)
|
|
+ return err;
|
|
+
|
|
+ if (regs[0] & REG_SECONDS_OS)
|
|
+ return -EAGAIN;
|
|
+ }
|
|
|
|
tm->tm_sec = bcd2bin(regs[0] & 0x7f);
|
|
tm->tm_min = bcd2bin(regs[1] & 0x7f);
|
|
@@ -246,7 +266,6 @@ static int pcf8523_rtc_set_time(struct d
|
|
return err;
|
|
|
|
regs[0] = REG_SECONDS;
|
|
- /* This will purposely overwrite REG_SECONDS_OS */
|
|
regs[1] = bin2bcd(tm->tm_sec);
|
|
regs[2] = bin2bcd(tm->tm_min);
|
|
regs[3] = bin2bcd(tm->tm_hour);
|