linux-kernel - Re: [PATCH] ARM: dts: n900: fix mmc1 card detect gpio polarity

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Date:   Mon, 21 Jan 2019 21:45:53 +0200
From:   Aaro Koskinen <aaro.koskinen@....fi>
To:     Tony Lindgren <tony@...mide.com>
Cc:     Arthur Demchenkov <spinal.by@...il.com>, bcousson@...libre.com,
        robh+dt@...nel.org, mark.rutland@....com,
        linux-omap@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ARM: dts: n900: fix mmc1 card detect gpio polarity

Hi,

On Mon, Jan 21, 2019 at 09:11:01AM -0800, Tony Lindgren wrote:
> * Arthur Demchenkov <spinal.by@...il.com> [190121 03:22]:
> > Wrong polarity of card detect GPIO pin leads to the system not
> > booting from external mmc, if the back cover of N900 is closed.
> > When the cover is open the system boots fine.
> > 
> > This wasn't noticed before, because of a bug, which was fixed
> > by commit e63201f19 (mmc: omap_hsmmc: Delete platform data GPIO
> > CD and WP).
> 
> Aaro, does this work for your test case too?

Yeah..

> > Kernels up to 4.19 ignored the card detect GPIO from DT.
> 
> Hmm so should this have a Fixes tag or not?

I think it should as v4.20 is broken.

A.

> Regards,
> 
> Tony
> 
> >  arch/arm/boot/dts/omap3-n900.dts | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/arch/arm/boot/dts/omap3-n900.dts b/arch/arm/boot/dts/omap3-n900.dts
> > index 182a53991c90..826920e6b878 100644
> > --- a/arch/arm/boot/dts/omap3-n900.dts
> > +++ b/arch/arm/boot/dts/omap3-n900.dts
> > @@ -814,7 +814,7 @@
> >  	/* For debugging, it is often good idea to remove this GPIO.
> >  	   It means you can remove back cover (to reboot by removing
> >  	   battery) and still use the MMC card. */
> > -	cd-gpios = <&gpio6 0 GPIO_ACTIVE_HIGH>; /* 160 */
> > +	cd-gpios = <&gpio6 0 GPIO_ACTIVE_LOW>; /* 160 */
> >  };
> >  
> >  /* most boards use vaux3, only some old versions use vmmc2 instead */
> > -- 
> > 2.11.0
> >