linux-kernel - Re: [PATCH 3/3] gpio: sprd: Add clear interrupt

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Date:   Thu, 10 Aug 2023 15:27:19 +0800
From:   wenhua lin <wenhua.lin1994@...il.com>
To:     Andy Shevchenko <andy@...nel.org>
Cc:     Wenhua Lin <Wenhua.Lin@...soc.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        Orson Zhai <orsonzhai@...il.com>,
        Baolin Wang <baolin.wang@...ux.alibaba.com>,
        Chunyan Zhang <zhang.lyra@...il.com>,
        linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org,
        Xiongpeng Wu <xiongpeng.wu@...soc.com>
Subject: Re: [PATCH 3/3] gpio: sprd: Add clear interrupt

On Tue, Aug 8, 2023 at 9:25 PM Andy Shevchenko <andy@...nel.org> wrote:
>
> On Tue, Aug 08, 2023 at 11:31:44AM +0800, Wenhua Lin wrote:
> > Clear interrupt after set the interrupt type.
>
> Why?
>
> Can't it be done in the ->init_hw() callback of GPIO IRQ chip?

Hi Andy:
The initialization state of EIC is high-level trigger. If the external
level is high and the interrupt condition is met,
EIC has a latch function. If the module registers the eic interrupt,
an interrupt will be generated immediately
 as soon as the eic interrupt is enabled. To solve this problem, our
processing method is to clear the interrupt
 once when setting the interrupt trigger type, in order to avoid that
this interrupt is the last interrupt.

Thanks
Wenhua.Lin

>
> --
> With Best Regards,
> Andy Shevchenko
>
>