Re: [PATCH v2 3/3] mmc: mediatek: add support for SDIO eint irq

From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
To: Axe Yang <axe.yang@mediatek.com>
Cc: Ulf Hansson <ulf.hansson@linaro.org>,
	Rob Herring <robh+dt@kernel.org>,
	Chaotian Jing <chaotian.jing@mediatek.com>,
	Matthias Brugger <matthias.bgg@gmail.com>,
	Adrian Hunter <adrian.hunter@intel.com>,
	Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>,
	Satya Tangirala <satyat@google.com>,
	Wolfram Sang <wsa+renesas@sang-engineering.com>,
	Lucas Stach <dev@lynxeye.de>, Eric Biggers <ebiggers@google.com>,
	Andrew Jeffery <andrew@aj.id.au>,
	Stephen Boyd <swboyd@chromium.org>,
	Kiwoong Kim <kwmad.kim@samsung.com>, Yue Hu <huyue2@yulong.com>,
	Tian Tao <tiantao6@hisilicon.com>,
	linux-mmc@vger.kernel.org, devicetree@vger.kernel.org,
	linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	linux-mediatek@lists.infradead.org
Subject: Re: [PATCH v2 3/3] mmc: mediatek: add support for SDIO eint irq
Date: Fri, 14 Jan 2022 15:38:27 +0200	[thread overview]
Message-ID: <YeF806Ucigo5vWmx@smile.fi.intel.com> (raw)
In-Reply-To: <52901ebe0db555f8e58dc0d59cfd703c5a0fc2de.camel@mediatek.com>

On Fri, Jan 14, 2022 at 11:06:36AM +0800, Axe Yang wrote:
> On Thu, 2022-01-13 at 12:47 +0200, Andy Shevchenko wrote:
> > On Thu, Jan 13, 2022 at 03:58:52PM +0800, Axe Yang wrote:
> > > On Tue, 2022-01-11 at 13:46 +0200, Andy Shevchenko wrote:
> > > > On Tue, Jan 11, 2022 at 09:40:46AM +0800, Axe Yang wrote:

...

> > > > > +		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");
> > > > 
> > > > In debug mode of pin control this will bring a duplicate message.
> > > 
> > > Can you explain more about this comment?
> > > I don't understand what the 'duplicate message' refers for.
> > 
> > Have you chance to read the implementation of pinctrl_lookup_state()?
> 
> I have read pinctrl_lookup_state(), and if the 'duplicate message' you
> were talking about is 'using pinctrl dummy state...':
> 
> https://elixir.bootlin.com/linux/latest/source/drivers/pinctrl/core.c#L1214
> No, this message will not appear in debug mode if pins_eint not found
> because pinctrl_dummy_state is always FALSE. MTK Soc do not need dummy
> state support.

I see, thanks for explanation. I'm wondering how good or bad would be
the idea of adding a debug message on the !pinctrl_dummy_state case.

-- 
With Best Regards,
Andy Shevchenko

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