From a1383655cfaa71609d6236ae0fcf3b6047462b98 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?=C3=81lvaro=20Fern=C3=A1ndez=20Rojas?= Date: Sat, 29 Feb 2020 09:25:20 +0100 Subject: bcm27xx: add linux 5.4 support MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Tested on bcm2710 (Raspberry Pi 3B). Signed-off-by: Álvaro Fernández Rojas --- ...pcf8523-properly-handle-oscillator-stop-b.patch | 56 ++++++++++++++++++++++ 1 file changed, 56 insertions(+) create mode 100644 target/linux/bcm27xx/patches-5.4/950-0002-Revert-rtc-pcf8523-properly-handle-oscillator-stop-b.patch (limited to 'target/linux/bcm27xx/patches-5.4/950-0002-Revert-rtc-pcf8523-properly-handle-oscillator-stop-b.patch') diff --git a/target/linux/bcm27xx/patches-5.4/950-0002-Revert-rtc-pcf8523-properly-handle-oscillator-stop-b.patch b/target/linux/bcm27xx/patches-5.4/950-0002-Revert-rtc-pcf8523-properly-handle-oscillator-stop-b.patch new file mode 100644 index 0000000000..87bfe77ace --- /dev/null +++ b/target/linux/bcm27xx/patches-5.4/950-0002-Revert-rtc-pcf8523-properly-handle-oscillator-stop-b.patch @@ -0,0 +1,56 @@ +From c5bb7a9c84494071bbed123af04556f6bc76c56f Mon Sep 17 00:00:00 2001 +From: Phil Elwell +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 +--- + 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); -- cgit v1.2.3