Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
MIME-Version: 1.0
References: <20230808033144.2276-1-Wenhua.Lin@unisoc.com> <ZNJCLyWCdihyeC7a@smile.fi.intel.com>
 <CAB9BWhctPWUuL8tLpQSHmn0UWQ2ej4jN87HO89bTEz5__o9rZg@mail.gmail.com>
In-Reply-To: <CAB9BWhctPWUuL8tLpQSHmn0UWQ2ej4jN87HO89bTEz5__o9rZg@mail.gmail.com>
From:   Andy Shevchenko <andy.shevchenko@gmail.com>
Date:   Thu, 10 Aug 2023 12:56:29 +0300
Message-ID: <CAHp75VeVS4MfgpXeeiZygPOqYHR3-LagvWFD9ujOGVTp=J+Buw@mail.gmail.com>
Subject: Re: [PATCH 3/3] gpio: sprd: Add clear interrupt
To:     wenhua lin <wenhua.lin1994@gmail.com>
Cc:     Andy Shevchenko <andy@kernel.org>,
        Wenhua Lin <Wenhua.Lin@unisoc.com>,
        Linus Walleij <linus.walleij@linaro.org>,
        Bartosz Golaszewski <brgl@bgdev.pl>,
        Orson Zhai <orsonzhai@gmail.com>,
        Baolin Wang <baolin.wang@linux.alibaba.com>,
        Chunyan Zhang <zhang.lyra@gmail.com>,
        linux-serial@vger.kernel.org, linux-kernel@vger.kernel.org,
        Xiongpeng Wu <xiongpeng.wu@unisoc.com>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
Precedence: bulk

On Thu, Aug 10, 2023 at 10:27=E2=80=AFAM wenhua lin <wenhua.lin1994@gmail.c=
om> wrote:
> On Tue, Aug 8, 2023 at 9:25=E2=80=AFPM Andy Shevchenko <andy@kernel.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.

Obvious question, isn't this needed to be added to ->init_hw() as well?

--=20
With Best Regards,
Andy Shevchenko