linux-kernel - [PATCH v4 0/4] Extend time to wait for UIP for some callers

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Message-ID: <20231128053653.101798-1-mario.limonciello@amd.com>
Date:   Mon, 27 Nov 2023 23:36:49 -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>, <dhaval.giani@...il.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Borislav Petkov <bp@...en8.de>,
        "H . Peter Anvin" <hpa@...or.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        Mario Limonciello <mario.limonciello@....com>
Subject: [PATCH v4 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.

By a debugging patch provided by Mateusz Jończyk it is shown that this
has taken upwards of 300ms 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.

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         | 10 ++++-----
 drivers/rtc/rtc-mc146818-lib.c | 39 ++++++++++++++++++++++++++--------
 include/linux/mc146818rtc.h    |  3 ++-
 7 files changed, 41 insertions(+), 19 deletions(-)


base-commit: 2cc14f52aeb78ce3f29677c2de1f06c0e91471ab
-- 
2.34.1