linux-kernel - Re: [PATCH v1 0/6] mmc: sdhci-pci: Add some CD GPIO related quirks

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Message-ID: <CAHp75Ve1Uy=U8wuU4rG5OU5NNr7xcmhQmGBPCm-vJSCWih2MqA@mail.gmail.com>
Date:   Tue, 12 Oct 2021 23:41:36 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Raul Rangel <rrangel@...omium.org>
Cc:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Eric Biggers <ebiggers@...gle.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-mmc <linux-mmc@...r.kernel.org>
Subject: Re: [PATCH v1 0/6] mmc: sdhci-pci: Add some CD GPIO related quirks

On Fri, Oct 8, 2021 at 1:29 AM Raul Rangel <rrangel@...omium.org> wrote:
>
> It looks like you were previously using the `cd-gpios` DT property to
> determine this.

No, it's not the case. The case is that we switched from hard coded
stuff (board files) to ACPI.

> It also sounds like you switched from DT to ACPI so
> you lost the ability to use this field?
>
> Can you not use something like the following:
> https://source.chromium.org/chromiumos/chromiumos/codesearch/+/main:src/third_party/kernel/v5.10/drivers/mmc/host/sdhci-acpi.c;l=945

No. It won't work. Anything like this won't work.

The problem here is on PCB level due to different uSD connectors ()
being use: one is Active High, the other is Active Low for CD signal.

...

> > > Any comments, hints, advice are welcome!

-- 
With Best Regards,
Andy Shevchenko