linux-kernel - Re: [PATCH] clocksource/drivers/timer-ti-dm: Fix suspend and resume for am3 and am4

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Message-ID: <20200720143033.GD10993@atomide.com>
Date:   Mon, 20 Jul 2020 07:30:33 -0700
From:   Tony Lindgren <tony@...mide.com>
To:     Carlos Hernandez <ceh@...com>
Cc:     Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, Roger Quadros <rogerq@...com>
Subject: Re: [PATCH] clocksource/drivers/timer-ti-dm: Fix suspend and resume
 for am3 and am4

* Carlos Hernandez <ceh@...com> [200717 21:35]:
> On 7/17/20 6:29 AM, Daniel Lezcano wrote:
> > On 13/07/2020 18:26, Tony Lindgren wrote:
> > > Fixes: 52762fbd1c47 ("clocksource/drivers/timer-ti-dm: Add clockevent and clocksource support")
> > > Reported-by: Carlos Hernandez <ceh@...com>
> > > Signed-off-by: Tony Lindgren <tony@...mide.com>
> > > ---
> > Carlos, were you able to test this patch ?
> 
> Tested the patch on top of 5.8-rc5.
> 
> cbdb2617290d (HEAD) clocksource/drivers/timer-ti-dm: Fix suspend and resume
> for am3 and am4
> 11ba468877bb (tag: v5.8-rc5) Linux 5.8-rc5
> 
> It works on am335x-evm but fails on am437x-evm

Thanks for testing.

> am4:
> 
> CCCCCCCC** 1196 printk messages dropped **

The above does not look normal..

> 44000000.ocp:L3 Custom Error: MASTER DSS TARGET GPMC (Read)
> ** 34 printk messages dropped **

..but the above points to the GPMC module failing to suspend.
This seems to be some other GPMC specific issue not related
to the system timers.

FYI, I have not seen the error above with am437x-sk-evm. But
then again, the sk-evm is probably not using GPMC.

Regards,

Tony