linux-kernel - Re: [PATCH] arm64: dts: rockchip: add enable-strobe-pulldown to emmc phy on rk3399

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Date:   Tue, 23 Aug 2022 13:53:49 +0200
From:   Heiko Stübner <heiko@...ech.de>
To:     Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Vinod Koul <vkoul@...nel.org>,
        Chris Ruehl <chris.ruehl@...ys.com.hk>,
        Jensen Huang <jensenhuang@...endlyarm.com>,
        Brian Norris <briannorris@...omium.org>,
        Doug Anderson <dianders@...omium.org>
Cc:     Jensen Huang <jensenhuang@...endlyarm.com>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64: dts: rockchip: add enable-strobe-pulldown to emmc phy on rk3399

Am Montag, 22. August 2022, 09:41:39 CEST schrieb Jensen Huang:
> Internal pull-down for strobe line (GRF_EMMCPHY_CON2[9]) was disabled
> by commit 8b5c2b45b8f0, which causes I/O error in HS400 mode.
> 
> Tested on NanoPC-T4.
> 
> Fixes: 8b5c2b45b8f0 ("phy: rockchip: set pulldown for strobe line in dts")
> Signed-off-by: Jensen Huang <jensenhuang@...endlyarm.com>

ok, so this looks like it restores previous functionality.

I'm just wondering as the "offending" patch is from 2020, why this
only turns up now. Any ideas?

> 
> diff --git a/arch/arm64/boot/dts/rockchip/rk3399.dtsi b/arch/arm64/boot/dts/rockchip/rk3399.dtsi
> index 9d5b0e8c9cca..9491cafbbaa3 100644
> --- a/arch/arm64/boot/dts/rockchip/rk3399.dtsi
> +++ b/arch/arm64/boot/dts/rockchip/rk3399.dtsi
> @@ -1561,6 +1561,7 @@ emmc_phy: phy@...0 {
>  			clock-names = "emmcclk";
>  			drive-impedance-ohm = <50>;
>  			#phy-cells = <0>;
> +			rockchip,enable-strobe-pulldown;
>  			status = "disabled";
>  		};
>  
>