linux-kernel - Re: [PATCH 5.10 003/135] bus: ti-sysc: Fix gpt12 system timer issue with reserved status

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Message-ID: <20210811065430.GA1270@duo.ucw.cz>
Date:   Wed, 11 Aug 2021 08:54:30 +0200
From:   Pavel Machek <pavel@...x.de>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Jarkko Nikula <jarkko.nikula@...mer.com>,
        Tony Lindgren <tony@...mide.com>,
        Sasha Levin <sashal@...nel.org>
Subject: Re: [PATCH 5.10 003/135] bus: ti-sysc: Fix gpt12 system timer issue
 with reserved status

Hi!

> Jarkko Nikula <jarkko.nikula@...mer.com> reported that Beagleboard
> revision c2 stopped booting. Jarkko bisected the issue down to
> commit 6cfcd5563b4f ("clocksource/drivers/timer-ti-dm: Fix suspend
> and resume for am3 and am4").
> 
> Let's fix the issue by tagging system timers as reserved rather than
> ignoring them. And let's not probe any interconnect target module child
> devices for reserved modules.
> 
> This allows PM runtime to keep track of clocks and clockdomains for
> the interconnect target module, and prevent the system timer from idling
> as we already have SYSC_QUIRK_NO_IDLE and SYSC_QUIRK_NO_IDLE_ON_INIT
> flags set for system timers.

There was interaction between two patches, and result is that this one
does not do anything useful, see:

https://lore.kernel.org/linux-omap/20210811061053.32081-1-tony@atomide.com/T/#u

I believe it should be dropped for now.

Best regards,
								Pavel
-- 
DENX Software Engineering GmbH,      Managing Director: Wolfgang Denk
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany

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