linux-kernel - Re: rpi-b-rev2 can't detect hdmi display due to wrong hpd gpio pull in dts

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Date:   Mon, 4 Mar 2019 21:15:42 +0100 (CET)
From:   Stefan Wahren <stefan.wahren@...e.com>
To:     Helen Koike <helen.koike@...labora.com>
Cc:     linux-rpi-kernel@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linus.walleij@...aro.org, lkundrak@...sk,
        bcm-kernel-feedback-list@...adcom.com, eric@...olt.net,
        devicetree@...r.kernel.org, kernel@...labora.com
Subject: Re: rpi-b-rev2 can't detect hdmi display due to wrong hpd gpio pull
 in dts

Hi Helen,

> Helen Koike <helen.koike@...labora.com> hat am 4. März 2019 um 19:54 geschrieben:
> 
> 
> Hello,
> 
> I have a rpi-b-rev2 (two holes, 512M) and when I was trying to test vc4
> driver, the HDMI wans't being detected.
> 
> So I changed the hpd-gpios from ACTIVE_LOW to ACTIVE_HIGH and now it
> works correctly. I can see that modeprint from libdrm detects correctly
> when the display is plugged and when it is unpluggled.
> 
> So I was wondering if this is just in my board or if there is an error
> in the dts (which I think it's unlikely).
> 
> In any case I am dropping this email here in case anyone else see this
> problem, if you do, try appliying the patch below.

thanks for your report and the patch. I verified your change against dt-blob.dts / downstream file and it's correct.

I'm sorry but i cannot apply your patch because it doesn't have the proper format.

Should i take care of this?
Can i add your Signed-off-by including your mail address?

Stefan

> 
> Regards,
> Helen
> 
> ---
>  arch/arm/boot/dts/bcm2835-rpi-b-rev2.dts | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/arm/boot/dts/bcm2835-rpi-b-rev2.dts b/arch/arm/boot/dts/bcm2835-rpi-b-rev2.dts
> index 5641d162dfdb..28e7513ce617 100644
> --- a/arch/arm/boot/dts/bcm2835-rpi-b-rev2.dts
> +++ b/arch/arm/boot/dts/bcm2835-rpi-b-rev2.dts
> @@ -93,7 +93,7 @@
>  };
>  
>  &hdmi {
> -	hpd-gpios = <&gpio 46 GPIO_ACTIVE_LOW>;
> +	hpd-gpios = <&gpio 46 GPIO_ACTIVE_HIGH>;
>  };
>  
>  &pwm {
> -- 
> 2.20.1
>