RE: [PATCHv4] serial: of-serial: fix up PM ops on no_console_suspend and port type

From: Jingchang Lu
Date: Wed Oct 15 2014 - 03:16:40 EST

>-----Original Message-----
>From: Joseph Lo [mailto:josephl@xxxxxxxxxx]
>Sent: Wednesday, October 15, 2014 2:53 PM
>To: Lu Jingchang-B35083; gregkh@xxxxxxxxxxxxxxxxxxx
>Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx; linux-serial@xxxxxxxxxxxxxxx;
>peter@xxxxxxxxxxxxxxxxxx; arnd@xxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx
>Subject: Re: [PATCHv4] serial: of-serial: fix up PM ops on
>no_console_suspend and port type
>On 10/15/2014 02:41 PM, Joseph Lo wrote:
>> On 10/15/2014 02:32 PM, Jingchang Lu wrote:
>>>> -----Original Message-----
>>>> From: Joseph Lo [mailto:josephl@xxxxxxxxxx]
>>>> Sent: Wednesday, October 15, 2014 9:01 AM
>>>> To: Lu Jingchang-B35083; gregkh@xxxxxxxxxxxxxxxxxxx
>>>> Cc: peter@xxxxxxxxxxxxxxxxxx; arnd@xxxxxxxx;
>>>> linux-kernel@xxxxxxxxxxxxxxx; linux-serial@xxxxxxxxxxxxxxx;
>>>> linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
>>>> Subject: Re: [PATCHv4] serial: of-serial: fix up PM ops on
>>>> no_console_suspend and port type
>>>> On 10/14/2014 04:42 PM, Jingchang Lu wrote:
>>>>> This patch fixes commit 2dea53bf57783f243c892e99c10c6921e956aa7e,
>>>>> "serial: of-serial: add PM suspend/resume support", which disables
>>>>> the uart clock on suspend, but also causes a hardware hang on
>>>>> register access if no_console_suspend command line option is used.
>>>>> Also, not every of_serial device is an 8250 port, so the serial8250
>>>>> suspend/resume functions should only be applied to a real 8250 port.
>>>>> Signed-off-by: Jingchang Lu <>
>>>> If you can make sure this patch can build without include
>>>> <linux/console.h>, then this patch
>>> The build passes on my cloned linux-next tree, include next-20141014,
>>> but is required on my another kernel-3.12+ based tree, then I didn't
>>> add this header file when upstream.
>>> Is the build broken on your source tree, and is the tree latest?
>>> If the header is needed, I will add it.
>> I tested it on next-20141013 and k3.14, both of them need the fix. I
>> can check it again against the latest linux-next tree later. Thanks.
>OK, I confirmed it. You should add the header file. It also doesn't build
>for me with the latest linux-next tree. Maybe you missed to enable
>CONFIG_PM_SLEEP or CONFIG_SERIAL_8250 when doing the build test in linux-
>next tree.
I have sent out the v5 patch with last git-send-email command line,
didn't realized the missing of your email address in the cc list when sending.
Please help review the v5 patch. Thanks.

Best Regards,