linux-kernel - Re: [PATCH 3/6] tty: serial: 8250 core: add runtime pm

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Message-ID: <53C6373E.2010408@linutronix.de>
Date:	Wed, 16 Jul 2014 10:26:38 +0200
From:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:	Tony Lindgren <tony@...mide.com>
CC:	linux-omap@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Felipe Balbi <balbi@...com>, linux-kernel@...r.kernel.org,
	linux-serial@...r.kernel.org, mika.westerberg@...ux.intel.com
Subject: Re: [PATCH 3/6] tty: serial: 8250 core: add runtime pm

On 07/10/2014 08:28 AM, Tony Lindgren wrote:
>> --- a/drivers/tty/serial/8250/8250_core.c
>> +++ b/drivers/tty/serial/8250/8250_core.c
>> @@ -571,7 +573,17 @@ static void serial8250_set_sleep(struct uart_8250_port *p, int sleep)
>>  			serial_out(p, UART_EFR, 0);
>>  			serial_out(p, UART_LCR, 0);
>>  		}
>> +
>> +		if (!device_may_wakeup(p->port.dev)) {
>> +			if (sleep)
>> +				pm_runtime_forbid(p->port.dev);
>> +			else
>> +				pm_runtime_allow(p->port.dev);
>> +		}
>>  	}
>> +out:
>> +	pm_runtime_mark_last_busy(p->port.dev);
>> +	pm_runtime_put_autosuspend(p->port.dev);
>>  }
> 
> The device_may_wakeup logic here is wrong as I described in the
> earlier thread. For runtime PM, the wake-up events should be
> always enabled. So the device_may_wakeup checks should be only
> done for suspend and resume.

Okay. I dropped it from here.

> 
> Regards,
> 
> Tony
> 

Sebastian
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