linux-kernel - Re: [PATCH v2 0/3] clocksource/vt8500: Fix hangs in small delays

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Date:	Thu, 24 Dec 2015 12:12:48 +0300
From:	Alexey Charkov <alchark@...il.com>
To:	Roman Volkov <v1ron@...l.ru>
Cc:	Tony Prisk <linux@...sktech.co.nz>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Arnd Bergmann <arnd@...db.de>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Roman Volkov <rvolkov@...os.org>
Subject: Re: [PATCH v2 0/3] clocksource/vt8500: Fix hangs in small delays

2015-12-24 0:35 GMT+03:00 Roman Volkov <v1ron@...l.ru>:
> From: Roman Volkov <rvolkov@...os.org>
>
> vt8500 hangs in nanosleep() function, starting from commit
> c6eb3f70d4482806dc2d3e1e3c7736f497b1d418, making the system unusable.
> Per investigation, looks like set_next_event() now receives too small
> delta and fails with -ETIME.
>
> Google group discussion:
> https://groups.google.com/forum/#!topic/vt8500-wm8505-linux-kernel/vDMF_mDOb1k
>
> v2:
> Address comments by Alexey Charkov. Merge patches to get less amount of
> changes (three patches instead of four).
>
> Tested on my WM8650, no issues in three days uptime.
>
> Roman Volkov (3):
>   clocksource/vt8500: Use MIN_OSCR_DELTA from PXA
>   clocksource/vt8500: Remove the 'loops' variable
>   clocksource/vt8500: Add register R/W functions
>
>  drivers/clocksource/vt8500_timer.c | 98 +++++++++++++++++++++++++++-----------
>  1 file changed, 69 insertions(+), 29 deletions(-)

This whole series looks good to me as far as VT8500 is concerned.
Thanks a lot Roman for fixing it and streamlining the bus
synchronization.

Acked-by: Alexey Charkov <alchark@...il.com>

Daniel, Thomas, any chance you could push this to -next via your
clocksource tree?

Best regards,
Alexey
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