linux-kernel - Re: [PATCH 11/18] arm64: dts: qcom: msm8994-octagon: Add uSD card and disable HS400 on eMMC

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Date:   Thu, 18 Feb 2021 14:41:15 +0100
From:   Pavel Machek <pavel@....cz>
To:     Konrad Dybcio <konrad.dybcio@...ainline.org>
Cc:     phone-devel@...r.kernel.org, ~postmarketos/upstreaming@...ts.sr.ht,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Gustave Monce <gustave.monce@...look.com>
Subject: Re: [PATCH 11/18] arm64: dts: qcom: msm8994-octagon: Add uSD card
 and disable HS400 on eMMC

On Sun 2021-01-31 02:38:42, Konrad Dybcio wrote:
> From: Gustave Monce <gustave.monce@...look.com>
> 
> Lumia 950/XL, like other phones, ship with different storage chips.
> Some of them are not capable of stable operation at HS400. Disable it.
> 
> Signed-off-by: Gustave Monce <gustave.monce@...look.com>
> Signed-off-by: Konrad Dybcio <konrad.dybcio@...ainline.org>
> ---
>  .../dts/qcom/msm8994-msft-lumia-octagon.dtsi  | 21 +++++++++++++++++++
>  1 file changed, 21 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/msm8994-msft-lumia-octagon.dtsi b/arch/arm64/boot/dts/qcom/msm8994-msft-lumia-octagon.dtsi
> index bf6e63a23600..004a42261cef 100644
> --- a/arch/arm64/boot/dts/qcom/msm8994-msft-lumia-octagon.dtsi
> +++ b/arch/arm64/boot/dts/qcom/msm8994-msft-lumia-octagon.dtsi
> @@ -684,6 +684,27 @@ vph_pwr_bbyp: boost-bypass {
>  
>  &sdhc1 {
>  	status = "okay";
> +
> +	/*
> +	 * This device is shipped with HS400 capabable eMMCs

Typo, should be "capable"?

> +	 * However various brands have been used in various product batches,
> +	 * including a Samsung eMMC (BGND3R) which features a quirk with HS400.
> +	 * Set the speed to HS200 as a safety measure.
> +	 */

And this makes little sense. "This device is often shipped..."?

Best regards,
									Pavel

-- 
http://www.livejournal.com/~pavelmachek

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