linux-kernel - [PATCH 0/4] Extend time to wait for UIP for some callers

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Date:   Fri, 17 Nov 2023 00:32:16 -0600
From:   Mario Limonciello <mario.limonciello@....com>
To:     Mateusz Jończyk <mat.jonczyk@...pl>,
        Alessandro Zummo <a.zummo@...ertech.it>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>
CC:     "open list:REAL TIME CLOCK (RTC) SUBSYSTEM" 
        <linux-rtc@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        <linux-pm@...r.kernel.org>, <tobrohl@...il.com>,
        <aalsing@...il.com>, <Dhaval.Giani@....com>, <xmb8dsv4@...il.com>,
        <x86@...nel.org>, Mario Limonciello <mario.limonciello@....com>
Subject: [PATCH 0/4] Extend time to wait for UIP for some callers

A number of users have reported their system will have a failure reading
the RTC around s2idle entry or exit.

This failure manifests as UIP clear taking longer than 10ms. Affected users
have reported that after this happens the clock jumps forward to 2077, which
is presumably from epoch + century bit.

Users who used a debugging patch provided by Mateusz Jończyk demonstrated
that this has taken upwards of 480ms in some cases.

This series adjusts the UIP timeout to be configurable by the caller and
changes some callers which aren't called in an interrupt context to allow
longer timeouts.

Link: https://bugzilla.kernel.org/show_bug.cgi?id=217626
Link: https://community.frame.work/t/responded-fw13-amd-fedora-39-system-clock-advances-50-years-during-overnight-suspend
Mario Limonciello (4):
  rtc: mc146818-lib: Adjust failure return code for mc146818_get_time()
  rtc: Adjust failure return code for cmos_set_alarm()
  rtc: Add support for configuring the UIP timeout for RTC reads
  rtc: Extend timeout for waiting for UIP to clear to 1s

 arch/alpha/kernel/rtc.c        |  2 +-
 arch/x86/kernel/hpet.c         |  2 +-
 arch/x86/kernel/rtc.c          |  2 +-
 drivers/base/power/trace.c     |  2 +-
 drivers/rtc/rtc-cmos.c         |  8 ++++----
 drivers/rtc/rtc-mc146818-lib.c | 35 ++++++++++++++++++++++++----------
 include/linux/mc146818rtc.h    |  3 ++-
 7 files changed, 35 insertions(+), 19 deletions(-)

-- 
2.34.1