linux-kernel - Re: [PATCH] arm64: dts: rockchip: include uhs support for rockpro64

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Date:   Wed, 28 Apr 2021 06:28:06 +0000
From:   Christian Löhle <CLoehle@...erstone.com>
To:     Soeren Moch <smoch@....de>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "heiko@...ech.de" <heiko@...ech.de>,
        "jbx6244@...il.com" <jbx6244@...il.com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-rockchip@...ts.infradead.org" 
        <linux-rockchip@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] arm64: dts: rockchip: include uhs support for rockpro64

Oh okay, I was not aware of this issue
and have not encountered it yet.
But wouldn't it be more appropriate
to get u-boot to power cycle the host controller at boot?


From: Soeren Moch <smoch@....de>
Sent: Tuesday, April 27, 2021 5:07 PM
To: Christian Löhle <CLoehle@...erstone.com>; robh+dt@...nel.org <robh+dt@...nel.org>; heiko@...ech.de <heiko@...ech.de>; jbx6244@...il.com <jbx6244@...il.com>; devicetree@...r.kernel.org <devicetree@...r.kernel.org>; linux-arm-kernel@...ts.infradead.org <linux-arm-kernel@...ts.infradead.org>; linux-rockchip@...ts.infradead.org <linux-rockchip@...ts.infradead.org>; linux-kernel@...r.kernel.org <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] arm64: dts: rockchip: include uhs support for rockpro64 
 
On 27.04.21 08:20, Christian L?hle wrote:
> The DesignWare Host Controller has full UHS-I support, so use it.
Enabling this UHS support makes 'reboot' hang when booting the RockPro64
from SD card. It would work when booting from eMMC, or with a modified
ATF which does a power cycle on reboot.

But for general use it is not save to enable UHS support, or did I miss
some recent changes?

Regards,
Soeren
>
> Signed-off-by: Christian Loehle <cloehle@...erstone.com>
> ---
>  arch/arm64/boot/dts/rockchip/rk3399-rockpro64.dtsi | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/arch/arm64/boot/dts/rockchip/rk3399-rockpro64.dtsi b/arch/arm64/boot/dts/rockchip/rk3399-rockpro64.dtsi
> index 6bff8db7d33e..d22a489ec214 100644
> --- a/arch/arm64/boot/dts/rockchip/rk3399-rockpro64.dtsi
> +++ b/arch/arm64/boot/dts/rockchip/rk3399-rockpro64.dtsi
> @@ -722,6 +722,7 @@ &sdmmc {
>        max-frequency = <150000000>;
>        pinctrl-names = "default";
>        pinctrl-0 = <&sdmmc_clk &sdmmc_cmd &sdmmc_bus4>;
> +     sd-uhs-sdr104;
>        vmmc-supply = <&vcc3v0_sd>;
>        vqmmc-supply = <&vcc_sdio>;
>        status = "okay";

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