linux-kernel - Re: [PATCH v1 3/3] mmc: mediatek: add support for SDIO eint irq

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Message-ID: <CAHp75VcVx4Yf69TEoSy8GL-he9ZAW+yvoH8-DXAotQ3Mwx7n2A@mail.gmail.com>
Date:   Mon, 27 Dec 2021 19:27:53 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Axe Yang <axe.yang@...iatek.com>
Cc:     Ulf Hansson <ulf.hansson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Chaotian Jing <chaotian.jing@...iatek.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
        Satya Tangirala <satyat@...gle.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Wolfram Sang <wsa+renesas@...g-engineering.com>,
        Lucas Stach <dev@...xeye.de>,
        Eric Biggers <ebiggers@...gle.com>,
        Andrew Jeffery <andrew@...id.au>,
        Stephen Boyd <swboyd@...omium.org>,
        Kiwoong Kim <kwmad.kim@...sung.com>,
        Yue Hu <huyue2@...ong.com>, Tian Tao <tiantao6@...ilicon.com>,
        linux-mmc <linux-mmc@...r.kernel.org>,
        devicetree <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-arm Mailing List <linux-arm-kernel@...ts.infradead.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>
Subject: Re: [PATCH v1 3/3] mmc: mediatek: add support for SDIO eint irq

On Mon, Dec 27, 2021 at 6:46 PM Axe Yang <axe.yang@...iatek.com> wrote:

...

> +       if (mmc->card && !mmc->card->cccr.enable_async_int) {
> +               if (enb)

Spell it fully, i.e. enable.


> +                       pm_runtime_get_noresume(host->dev);
> +               else
> +                       pm_runtime_put_noidle(host->dev);
> +       }

...

> +       int ret = 0;

Redundant assignment, see below.

...

> +       desc = devm_gpiod_get_index(host->dev, "eint", 0, GPIOD_IN);

Why _index variant? By default devm_gpiod_get() uses 0 for index.

> +       if (IS_ERR(desc))
> +               return PTR_ERR(desc);

...

> +       irq = gpiod_to_irq(desc);

ret = ...
if (ret < 0)
  ...handle error...

> +       if (irq >= 0) {

(for the record, 0 is never returned by gpiod_to_irq() according to
all its versions).

> +               irq_set_status_flags(irq, IRQ_NOAUTOEN);

Use corresponding flag:
https://elixir.bootlin.com/linux/latest/source/include/linux/interrupt.h#L83

> +               ret = devm_request_threaded_irq(host->dev, irq, NULL, msdc_sdio_eint_irq,
> +                                               IRQF_TRIGGER_LOW | IRQF_ONESHOT,
> +                                               "sdio-eint", host);
> +       } else {
> +               ret = irq;
> +       }
> +
> +       host->eint_irq = irq;

Is it okay if you assign garbage here in case of error?

> +       return ret;

...

> +       host->pins_eint = pinctrl_lookup_state(host->pinctrl, "state_eint");
> +       if (IS_ERR(host->pins_eint)) {
> +               dev_dbg(&pdev->dev, "Cannot find pinctrl eint!\n");
> +       } else {
> +               host->pins_dat1 = pinctrl_lookup_state(host->pinctrl, "state_dat1");
> +               if (IS_ERR(host->pins_dat1)) {

> +                       ret = PTR_ERR(host->pins_dat1);
> +                       dev_err(&pdev->dev, "Cannot find pinctrl dat1!\n");

ret = dev_err_probe(...); ?

> +                       goto host_free;
> +               }
> +       }

...

> +       if (!IS_ERR(host->pins_eint)) {

I'm wondering if you can use a pattern "error check first"?

> +               disable_irq(host->irq);
> +               pinctrl_select_state(host->pinctrl, host->pins_eint);
> +               spin_lock_irqsave(&host->lock, flags);
> +               if (host->sdio_irq_cnt == 0) {
> +                       enable_irq(host->eint_irq);
> +                       enable_irq_wake(host->eint_irq);
> +                       host->sdio_irq_cnt++;
> +               }
> +               sdr_clr_bits(host->base + SDC_CFG, SDC_CFG_SDIOIDE);
> +               spin_unlock_irqrestore(&host->lock, flags);
> +       }

-- 
With Best Regards,
Andy Shevchenko