linux-kernel - Re: [PATCH] tty/serial: fix config dependencies for samsung serial

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Date:	Tue, 23 Sep 2014 12:34:26 +0530
From:	Abhilash Kesavan <kesavan.abhilash@...il.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Naveen Krishna Ch <naveenkrishna.ch@...il.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Naveen Krishna Chatradhi <ch.naveen@...sung.com>,
	linux-serial@...r.kernel.org,
	"linux-samsung-soc@...r.kernel.org" 
	<linux-samsung-soc@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Pankaj Dubey <pankaj.dubey@...sung.com>
Subject: Re: [PATCH] tty/serial: fix config dependencies for samsung serial

Hi Arnd,

I will be taking this forward as Naveen is no longer with Samsung.

On Wed, Sep 3, 2014 at 4:26 PM, Arnd Bergmann <arnd@...db.de> wrote:
> On Wednesday 03 September 2014 13:51:56 Naveen Krishna Ch wrote:
>> On 2 September 2014 21:16, Arnd Bergmann <arnd@...db.de> wrote:
>> > On Tuesday 02 September 2014 20:52:00 Naveen Krishna Chatradhi wrote:
>> >> Make the config symbols SERIAL_SAMSUNG_UARTS_4 and
>> >> SERIAL_SAMSUNG_UARTS depend on SERIAL_SAMSUNG rather than
>> >> PLAT_SAMSUNG.
>> >
>> > Please always describe why you are doing a change. This patch
>> > seems really pointless.

I will re-post the patch with a better commit message once we sort the
below issue.

>>
>> The SERIAL_SAMSUNG_UARTS_4 and SERIAL_SAMSUNG_UARTS config options are
>> meaningful only if SERIAL_SAMSUNG is enabled. Hence the dependency
>> rules were changed. I will repost this patch with better description.
>
> My point is that the options are used by both the uart driver and
> the platform code, e.g. for the purpose of PM debugging which can
> be enabled even when the serial-samsung driver is turned off.

I looked through the code and could find two references to these
symbols in the platform-specific code: arch/arm/plat-samsung/init.c
and arch/arm/mach-s3c64xx/irq-pm.c. The first one is being used to
initialize the uart platform device in non-dt way while the second one
saves and restores the uart irq masks for all channels across a
suspend/resume cycle. Also, the save/restore will get bypassed in case
CONFIG_SERIAL_SAMSUNG_UARTS is not defined. It does not look like
either of these cases would cause any issue with the current patch,
can you please help me understand the problem ?

Regards,
Abhilash
>
>> >>  config SERIAL_SAMSUNG_UARTS_4
>> >>         bool
>> >> -       depends on PLAT_SAMSUNG
>> >> +       depends on SERIAL_SAMSUNG
>> >>         default y if !(CPU_S3C2410 || CPU_S3C2412 || CPU_S3C2440 || CPU_S3C2442)
>> >>         help
>> >>           Internal node for the common case of 4 Samsung compatible UARTs
>> >>
>> >>  config SERIAL_SAMSUNG_UARTS
>> >>         int
>> >> -       depends on PLAT_SAMSUNG
>> >> +       depends on SERIAL_SAMSUNG
>> >>         default 4 if SERIAL_SAMSUNG_UARTS_4 || CPU_S3C2416
>> >>         default 3
>> >>         help
>> >>
>> >
>> > Have you checked that it still builds on all samsung platforms when
>> > SERIAL_SAMSUNG is disabled? We have had build errors in this area
>> > in the past.
>>
>> Yes, it builds for other Samsung platforms.
>
> Ok.
>
>         Arnd
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