linux-kernel - Re: [PATCH v9 11/25] gpio/omap: cleanup omap_gpio_mod

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Message-ID: <CAC83Zv+CCLQfZHfqMcbof6JtA-hOK1PfX5Gs0BBVQhBAiWzX_g@mail.gmail.com>
Date:	Wed, 25 Apr 2012 10:04:42 +0530
From:	"DebBarma, Tarun Kanti" <tarun.kanti@...com>
To:	Tony Lindgren <tony@...mide.com>
Cc:	Janusz Krzysztofik <jkrzyszt@....icnet.pl>,
	linux-omap@...r.kernel.org, grant.likely@...retlab.ca,
	khilman@...com, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, Charulatha V <charu@...com>
Subject: Re: [PATCH v9 11/25] gpio/omap: cleanup omap_gpio_mod_init function

On Tue, Apr 24, 2012 at 9:34 PM, Tony Lindgren <tony@...mide.com> wrote:
> * DebBarma, Tarun Kanti <tarun.kanti@...com> [120424 08:40]:
>> Hi Janusz,
>>
>> On Tue, Apr 24, 2012 at 12:24 AM, DebBarma, Tarun Kanti
>> <tarun.kanti@...com> wrote:
>> > On Sat, Apr 21, 2012 at 7:33 PM, Janusz Krzysztofik
>> > <jkrzyszt@....icnet.pl> wrote:
>> >> On Thursday 02 of February 2012 23:00:37 Tarun Kanti DebBarma wrote:
>> >>> With register offsets now defined for respective OMAP versions we can get rid
>> >>> of cpu_class_* checks. This function now has common initialization code for
>> >>> all OMAP versions...
>> >>>
>> >>> Signed-off-by: Tarun Kanti DebBarma <tarun.kanti@...com>
>> >>> Signed-off-by: Charulatha V <charu@...com>
>> >>> Reviewed-by: Santosh Shilimkar <santosh.shilimkar@...com>
>> >>> Acked-by: Tony Lindgren <tony@...mide.com>
>> >>
>> >> Sorry for being so late with my comment for chanes already present in
>> >> mainline, but this patch breaks GPIO on Amstrad Delta at least, and I
>> >> have neither enough spare time nor enough experience with non OMAP1
>> >> machines to provide a solution myself.
>> > Yes, I looked at the omap_gpio_mod_init() and OMAP1 configurations are
>> > overwritten.
>> > Also looks like there is issue in making distinction between omap15xx
>> > and omap16xx.
>> > I will post a patch and you can help me testing it in OMAP1 platform.
>> > Thanks for pointing this out.
> ...
>
>> Here is the patch, with attachment as well. I have just tested on
>> OMAP4 platform.
>> Testing on other OMAP2+ platforms is pending. In the meantime can you please
>> validate on OMAP1 platform and confirm? Thanks.
>> --
>> Tarun
>>
>> From: Tarun Kanti DebBarma <tarun.kanti@...com>
>> Date: Tue, 24 Apr 2012 20:34:32 +0530
>> Subject: [PATCH] gpio/omap: fix omap1 register overwrite in omap_gpio_mod_init
>>
>> Initialization of irqenable, irqstatus registers is the common
>> operation done in this function for all OMAP platforms, viz.
>> OMAP1, OMAP2+. The latter _gpio_rmw()'s to irqenable register
>> was overwriting the correctly programmed OMAP1 value at the
>> beginning. As a result, even though it worked on OMAP2+
>> platforms it was breaking OMAP1 functionality.
>
> Sounds like the original patch was never tested on omap1?
That's right, only bootup test was done on OMAP1710-SDP.

>
>> On closer observation it is found that the first _gpio_rmw()
>> which is supposedly done to take care of OMAP1 platform is
>> generic enough and takes care of OMAP2+ platform as well.
>> Therefore remove the latter _gpio_rmw() to irqenable as they
>> are redundant.
>>
>> Also, changing the sequence and logic of initializing the
>> irqstatus.
>
> Please mention also the breaking commit here and get this fix
> merged as a regression as soon as it's tested for the current
> -rc series.
Sure, I will do that!
--
Tarun
>
> Regards,
>
> Tony
>
>
>> Signed-off-by: Tarun Kanti DebBarma <tarun.kanti@...com>
>> ---
>>  drivers/gpio/gpio-omap.c |    5 +----
>>  1 files changed, 1 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/gpio/gpio-omap.c b/drivers/gpio/gpio-omap.c
>> index 1adc2ec..b8f01c1 100644
>> --- a/drivers/gpio/gpio-omap.c
>> +++ b/drivers/gpio/gpio-omap.c
>> @@ -964,11 +964,8 @@ static void omap_gpio_mod_init(struct gpio_bank *bank)
>>                 return;
>>         }
>>
>> +       _gpio_rmw(base, bank->regs->irqstatus, l,
>> bank->regs->irqenable_inv == 0 );
>>         _gpio_rmw(base, bank->regs->irqenable, l, bank->regs->irqenable_inv);
>> -       _gpio_rmw(base, bank->regs->irqstatus, l,
>> -                                       bank->regs->irqenable_inv == false);
>> -       _gpio_rmw(base, bank->regs->irqenable, l, bank->regs->debounce_en != 0);
>> -       _gpio_rmw(base, bank->regs->irqenable, l, bank->regs->ctrl != 0);
>>         if (bank->regs->debounce_en)
>>                 _gpio_rmw(base, bank->regs->debounce_en, 0, 1);
>>
>> --
>> 1.7.0.4
>
>
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