linux-kernel - Re: [PATCH] arm64: dts: rockchip: Fix SD card controller probe on Pinephone Pro

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Message-ID: <20220906004554.btzmcjqox4n3hdtf@notapiano>
Date:   Mon, 5 Sep 2022 20:45:54 -0400
From:   Nícolas F. R. A. Prado <n@...aprado.net>
To:     Ondrej Jirman <megi@....cz>
Cc:     linux-rockchip@...ts.infradead.org,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Heiko Stuebner <heiko@...ech.de>,
        Martijn Braam <martijn@...xit.nl>,
        Tom Fitzhenry <tom@...-fitzhenry.me.uk>,
        Caleb Connolly <kc@...tmarketos.org>,
        Arnaud Ferraris <arnaud.ferraris@...il.com>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        "moderated list:ARM/Rockchip SoC support" 
        <linux-arm-kernel@...ts.infradead.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] arm64: dts: rockchip: Fix SD card controller probe on
 Pinephone Pro

On Mon, Sep 05, 2022 at 01:36:47AM +0200, Ondrej Jirman wrote:
> Voltage constraints on vccio_sd are invalid. They don't match the voltages
> that LDO9 can generate, and this causes rk808-regulator driver to fail
> to probe with -EINVAL when it tries to apply the constraints during boot.
> 
> Fix the constraints to something that LDO9 can be actually configured for.
> 
> Fixes: 78a21c7d5952 ("arm64: dts: rockchip: Add initial support for Pine64 PinePhone Pro")
> Signed-off-by: Ondrej Jirman <megi@....cz>
> ---
>  arch/arm64/boot/dts/rockchip/rk3399-pinephone-pro.dts | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/rockchip/rk3399-pinephone-pro.dts b/arch/arm64/boot/dts/rockchip/rk3399-pinephone-pro.dts
> index f00c80361377a..2e058c3150256 100644
> --- a/arch/arm64/boot/dts/rockchip/rk3399-pinephone-pro.dts
> +++ b/arch/arm64/boot/dts/rockchip/rk3399-pinephone-pro.dts
> @@ -253,8 +253,8 @@ regulator-state-mem {
>  
>  			vccio_sd: LDO_REG9 {
>  				regulator-name = "vccio_sd";
> -				regulator-min-microvolt = <1710000>;
> -				regulator-max-microvolt = <3150000>;
> +				regulator-min-microvolt = <1800000>;
> +				regulator-max-microvolt = <3300000>;

Shouldn't the maximum be 3.1V? The SDMMC0_VDD pin on RK3399 that this regulator
is connected to expects a maximum voltage of 3.15V, so 3.3V would be too high.
The output voltage for LDO9 is configured in 100mV steps, so I imagine that's
why 3.15V fails, but 3.1V should work fine. I haven't tested yet though.

Thanks,
Nícolas