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From: Andy Shevchenko <andy.shevchenko@gmail.com>
To: Mika Westerberg <mika.westerberg@linux.intel.com>
Cc: Rajat Jain <rajatja@google.com>,
	Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
	Linus Walleij <linus.walleij@linaro.org>,
	Dmitry Torokhov <dtor@google.com>,
	"open list:GPIO SUBSYSTEM" <linux-gpio@vger.kernel.org>,
	ACPI Devel Maling List <linux-acpi@vger.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Adrian Hunter <adrian.hunter@intel.com>,
	Ulf Hansson <ulf.hansson@linaro.org>,
	linux-mmc <linux-mmc@vger.kernel.org>,
	Rajat Jain <rajatxjain@gmail.com>
Subject: Re: sdhci driver card-detect is broken because gpiolib can't fallback to _CRS?
Date: Wed, 26 Sep 2018 11:42:21 +0300	[thread overview]
Message-ID: <CAHp75Vdf7NxFtgZx+hqsA1YZY4szD5Ba9jbyo4CeeDHeaU3YAQ@mail.gmail.com> (raw)
In-Reply-To: <20180926074756.GD2664@lahna.fi.intel.com>

On Wed, Sep 26, 2018 at 10:49 AM Mika Westerberg
<mika.westerberg@linux.intel.com> wrote:
>
> Hi,
>
> On Tue, Sep 25, 2018 at 01:54:57PM -0700, Rajat Jain wrote:
> > * Use con_id=NULL if it is dealing with a legacy BIOS (i.e. no _DSD
> > properties in the ACPI).
> > * Use con_id=<actual string> if it is dealing with a modern BIOS (i.e.
> > which provides _DSD for the <string> property)
>
> Or you can use con_id=<actual string> everywhere and supply
> acpi_dev_add_driver_gpios() where needed to cover cases where BIOS does
> not provide _DSD. See also Documentation/acpi/gpio-properties.txt for
> more information.

Thanks, Mika. That is exactly the way how I suggested to fix and
actually fixed a lot of drivers already.

Run `git grep -n -w devm_acpi_dev_add_driver_gpios` to find examples.

> In case of SDHCI I think the correct way is to stick using _CRS lookup
> only because there typically is just one GpioInt() and I have not seen a
> single BIOS yet where they implement _DSD for this besides yours. If
> there is not way to change the BIOS implementation then I guess we just
> need to amend the driver to call acpi_dev_add_driver_gpios().

True.

-- 
With Best Regards,
Andy Shevchenko

  reply	other threads:[~2018-09-26  8:42 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-09-25 20:54 sdhci driver card-detect is broken because gpiolib can't fallback to _CRS? Rajat Jain
2018-09-25 20:54 ` Rajat Jain
2018-09-26  7:47 ` Mika Westerberg
2018-09-26  8:42   ` Andy Shevchenko [this message]
2018-09-26 19:25     ` Rajat Jain
2018-09-27  7:26       ` Andy Shevchenko
2018-09-27 17:56         ` Rajat Jain
2018-09-28  8:42           ` Linus Walleij
2018-09-28 12:34             ` Rajat Jain
2018-09-28 13:13               ` Linus Walleij
2018-10-18 21:51                 ` [PATCH] mmc: sdhci-pci: Try "cd" for card-detect lookup before using NULL Rajat Jain
2018-10-19  9:13                   ` Andy Shevchenko
2018-10-22 23:34                     ` Rajat Jain
2018-10-24 10:02                       ` Andy Shevchenko
2018-10-24 18:03                         ` Dmitry Torokhov
2018-10-29 15:23                           ` Andy Shevchenko
2018-10-29 17:22                             ` Rajat Jain
2018-10-29 17:43                               ` Andy Shevchenko
2018-10-29 19:43                                 ` Rajat Jain
2018-10-29 22:17                                   ` [PATCH v2] " Rajat Jain
2018-10-30  7:53                                     ` Adrian Hunter
2018-11-12 11:05                                     ` Ulf Hansson
2018-11-12 11:25                                       ` Andy Shevchenko
2018-11-13  1:26                                         ` Rajat Jain

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