RE: [PATCH] serial: of-serial: add PM suspend/resume support

[Jingchang Lu]

>-----Original Message-----
>From: Joseph Lo [mailto:josephl@xxxxxxxxxx]
>Sent: Friday, October 03, 2014 3:46 PM
>To: Lu Jingchang-B35083; gregkh@xxxxxxxxxxxxxxxxxxx
>Cc: devicetree@xxxxxxxxxxxxxxx; arnd@xxxxxxxx; linux-
>kernel@xxxxxxxxxxxxxxx; linux-serial@xxxxxxxxxxxxxxx; linux-arm-
>kernel@xxxxxxxxxxxxxxxxxxx
>Subject: Re: [PATCH] serial: of-serial: add PM suspend/resume support
>
>Hi,
>
>This patch might have a potential issue that cause system hard hung
>immediately when it accesses to registers with no clock. This could happen
>on many chips that mainline kernel supporting with the setting
>"no_console_suspend=1" during suspend time.
>
>On 09/23/2014 04:34 PM, Jingchang Lu wrote:
>> This adds PM suspend/resume support for the of-serial driver to
>> provide power management support on devices attatched to it.
>>
>> Signed-off-by: Jingchang Lu <jingchang.lu@xxxxxxxxxxxxx>
>> ---
>>   drivers/tty/serial/of_serial.c | 27 +++++++++++++++++++++++++++
>>   1 file changed, 27 insertions(+)
>>
>> diff --git a/drivers/tty/serial/of_serial.c
>> b/drivers/tty/serial/of_serial.c index 27981e2..8bc2563 100644
>> --- a/drivers/tty/serial/of_serial.c
>> +++ b/drivers/tty/serial/of_serial.c
>> @@ -240,6 +240,32 @@ static int of_platform_serial_remove(struct
>platform_device *ofdev)
>>   	return 0;
>>   }
>>
>> +#ifdef CONFIG_PM_SLEEP
>> +static int of_serial_suspend(struct device *dev) {
>> +	struct of_serial_info *info = dev_get_drvdata(dev);
>> +
>> +	serial8250_suspend_port(info->line);
>> +	if (info->clk)
>The fix would be something like this.
>	if (info->clk && console_suspend_enabled)
>
Yes, there will be, I will send a fix on this, thanks!

Best Regards,
Jingchang
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