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

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Date:   Tue, 21 Jul 2020 09:11:29 -0400
From:   Carlos Hernandez <ceh@...com>
To:     Daniel Lezcano <daniel.lezcano@...aro.org>,
        Tony Lindgren <tony@...mide.com>,
        Thomas Gleixner <tglx@...utronix.de>
CC:     <linux-kernel@...r.kernel.org>, <linux-omap@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] clocksource/drivers/timer-ti-dm: Fix suspend and resume
 for am3 and am4


On 7/17/20 6:29 AM, Daniel Lezcano wrote:
> On 13/07/2020 18:26, Tony Lindgren wrote:
>> Carlos Hernandez <ceh@...com> reported that we now have a suspend and
>> resume regresssion on am3 and am4 compared to the earlier kernels. While
>> suspend and resume works with v5.8-rc3, we now get errors with rtcwake:
>>
>> pm33xx pm33xx: PM: Could not transition all powerdomains to target state
>> ...
>> rtcwake: write error
>>
>> This is because we now fail to idle the system timer clocks that the
>> idle code checks and the error gets propagated to the rtcwake.
>>
>> Turns out there are several issues that need to be fixed:
>>
>> 1. Ignore no-idle and no-reset configured timers for the ti-sysc
>>     interconnect target driver as otherwise it will keep the system timer
>>     clocks enabled
>>
>> 2. Toggle the system timer functional clock for suspend for am3 and am4
>>     (but not for clocksource on am3)
>>
>> 3. Only reconfigure type1 timers in dmtimer_systimer_disable()
>>
>> 4. Use of_machine_is_compatible() instead of of_device_is_compatible()
>>     for checking the SoC type
>>
>> 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>
>> ---

Tested-by: Carlos Hernandez <ceh@...com>


> Carlos, were you able to test this patch ?
>
-- 
Carlos