linux-kernel - Re: [PATCH] sdhci: Fix SD card detection issue

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Message-ID: <ZhzVmmndefd5zDFh@shell.armlinux.org.uk>
Date: Mon, 15 Apr 2024 08:22:02 +0100
From: "Russell King (Oracle)" <linux@...linux.org.uk>
To: Adrian Hunter <adrian.hunter@...el.com>
Cc: Richard Clark <richard.xnu.clark@...il.com>, ulf.hansson@...aro.org,
	linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] sdhci: Fix SD card detection issue

On Mon, Apr 15, 2024 at 10:18:39AM +0300, Adrian Hunter wrote:
> On 15/04/24 10:06, Richard Clark wrote:
> > The mmc_gpio_get_cd(...) will return 0 called from sdhci_get_cd(...), which means
> > the card is not present. Actually, the card detection pin is active low by default
> > according to the SDHCI psec, thus the card detection result is not correct, more
> 
> SDHCI spec covers the SDHCI lines.  GPIO is separate.

.. and the key bit of information that should be mentioned is in the
case of a GPIO, the GPIO library can be told if a GPIO is active-high
or active-low in either firmware or via the GPIO lookup data, and this
should be used instead of drivers inventing their own "quirking".

-- 
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