[linux-sunxi] [PATCH] pinctrl: sunxi: Honor GPIO output initial vaules

[Chen-Yu Tsai]

Hi,

On Wed, Jan 15, 2014 at 6:02 PM, Maxime Ripard
<maxime.ripard at free-electrons.com> wrote:
> Hi Chen-Yu,
>
> Nice catch :)
>
> On Wed, Jan 15, 2014 at 04:21:12PM +0800, Chen-Yu Tsai wrote:
>> Hi,
>>
>> On Wed, Jan 15, 2014 at 8:37 AM, Ma Haijun <mahaijuns at gmail.com> wrote:
>> > Hi,
>> >
>> > I think it is better to set the output value first to avoid glitch.
>>
>> If I understand the user manual correctly, setting the output value
>> before changing the pin to output function first will have no effect.
>
> I just tested it on my A31, and it is working as expected (the output
> value isn't output until the direction is changed).
>
> It would be great if you could test this as well on your device, and
> change it like suggested.

Tested on A20, works as you described. Output value is queued and changed
when pin function is changed to output.

I will rearrange the function calls and resend.


Cheers
ChenYu