rtc: Add support for configuring the UIP timeout for RTC reads
authorMario Limonciello <mario.limonciello@amd.com>
Tue, 28 Nov 2023 05:36:52 +0000 (23:36 -0600)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Thu, 1 Feb 2024 00:18:56 +0000 (16:18 -0800)
commit9d20185601a030266e222bd7a513984f28170e18
tree09da496809dfa1e0838332d0d4b808c0590750ef
parentd2d8ceb748346dc1e957f19b65a75532b146a9a9
rtc: Add support for configuring the UIP timeout for RTC reads

commit 120931db07b49252aba2073096b595482d71857c upstream.

The UIP timeout is hardcoded to 10ms for all RTC reads, but in some
contexts this might not be enough time. Add a timeout parameter to
mc146818_get_time() and mc146818_get_time_callback().

If UIP timeout is configured by caller to be >=100 ms and a call
takes this long, log a warning.

Make all callers use 10ms to ensure no functional changes.

Cc: <stable@vger.kernel.org> # 6.1.y
Fixes: ec5895c0f2d8 ("rtc: mc146818-lib: extract mc146818_avoid_UIP")
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Tested-by: Mateusz Jończyk <mat.jonczyk@o2.pl>
Reviewed-by: Mateusz Jończyk <mat.jonczyk@o2.pl>
Acked-by: Mateusz Jończyk <mat.jonczyk@o2.pl>
Link: https://lore.kernel.org/r/20231128053653.101798-4-mario.limonciello@amd.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
arch/alpha/kernel/rtc.c
arch/x86/kernel/hpet.c
arch/x86/kernel/rtc.c
drivers/base/power/trace.c
drivers/rtc/rtc-cmos.c
drivers/rtc/rtc-mc146818-lib.c
include/linux/mc146818rtc.h