From: Ilya Dikariev <dikarill@b-tu.de>
To: Chen-Yu Tsai <wens@csie.org>,
Jernej Skrabec <jernej.skrabec@gmail.com>,
Samuel Holland <samuel@sholland.org>
Cc: linux-arm-kernel@lists.infradead.org
Subject: timer unit of Allwinner A64 UNKNOWN1 bug
Date: Thu, 3 Nov 2022 13:04:44 +0100 [thread overview]
Message-ID: <20221103130444.5ace902c@rosh> (raw)
[-- Attachment #1: Type: text/plain, Size: 510 bytes --]
Hello all,
owned a Pinephone and it turns out, that the genmask(8,0) is not
sufficient to get a workaround in this particular case.
The phone get freezed pretty often, and after some 10-15 minutes
unfreezes. Time jumps too.
Did the test https://github.com/smaeul/timer-tools that resulted in
https://pastebin.com/xbTeksJN
After applying the patch (changing to genmask(7,0)) the test passed. No
errors within hours and no freezes/time jumps.
Could you implement this into a mainline?
Best regards,
Ilya
[-- Attachment #2: rcu.patch --]
[-- Type: text/x-patch, Size: 433 bytes --]
--- a/drivers/clocksource/arm_arch_timer.c 2022-11-03 12:55:50.149533030 +0100
+++ b/drivers/clocksource/arm_arch_timer.c 2022-11-03 12:56:25.309720213 +0100
@@ -371,7 +371,7 @@
do { \
_val = read_sysreg(reg); \
_retries--; \
- } while (((_val + 1) & GENMASK(8, 0)) <= 1 && _retries); \
+ } while (((_val + 1) & GENMASK(7, 0)) <= 1 && _retries); \
\
WARN_ON_ONCE(!_retries); \
_val; \
[-- Attachment #3: Type: text/plain, Size: 176 bytes --]
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