linux-kernel - Re: [PATCHv4] serial: of-serial: fix up PM ops on no_console

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Date:	Wed, 15 Oct 2014 14:52:53 +0800
From:	Joseph Lo <josephl@...dia.com>
To:	Jingchang Lu <jingchang.lu@...escale.com>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>
CC:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>,
	"peter@...leysoftware.com" <peter@...leysoftware.com>,
	"arnd@...db.de" <arnd@...db.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
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@...dia.com]
>>> Sent: Wednesday, October 15, 2014 9:01 AM
>>> To: Lu Jingchang-B35083; gregkh@...uxfoundation.org
>>> Cc: peter@...leysoftware.com; arnd@...db.de; linux-kernel@...r.kernel.org;
>>> linux-serial@...r.kernel.org; linux-arm-kernel@...ts.infradead.org
>>> 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 <jingchang.lu@...escale.com>
>>>
>>> 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.

-Joseph
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