linux-kernel - Re: [PATCH] arm64: dts: qcom: msm8996-tone: Fix USB taking 6 minutes to wake up

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Date:   Fri, 25 Nov 2022 09:18:40 +0100
From:   Neil Armstrong <neil.armstrong@...aro.org>
To:     Konrad Dybcio <konrad.dybcio@...aro.org>,
        ~postmarketos/upstreaming@...ts.sr.ht
Cc:     martin.botka@...ainline.org,
        angelogioacchino.delregno@...ainline.org,
        marijn.suijten@...ainline.org, jamipkettunen@...ainline.org,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64: dts: qcom: msm8996-tone: Fix USB taking 6 minutes
 to wake up

On 24/11/2022 23:01, Konrad Dybcio wrote:
> The hardware turns out to be pretty sluggish at assuming it can only
> do USB2 with just a USB2 phy assigned to it - before it needed about
> 6 minutes to acknowledge that.
> 
> Limit it to USB-HS explicitly to make USB come up about 720x faster.
> 
> Fixes: 9da65e441d4d ("arm64: dts: qcom: Add support for SONY Xperia X Performance / XZ / XZs (msm8996, Tone platform)")
> Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>
> ---
> No words.
> 
>   arch/arm64/boot/dts/qcom/msm8996-sony-xperia-tone.dtsi | 5 +----
>   1 file changed, 1 insertion(+), 4 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/qcom/msm8996-sony-xperia-tone.dtsi b/arch/arm64/boot/dts/qcom/msm8996-sony-xperia-tone.dtsi
> index 12a7b6d91dbe..0ab9687f3406 100644
> --- a/arch/arm64/boot/dts/qcom/msm8996-sony-xperia-tone.dtsi
> +++ b/arch/arm64/boot/dts/qcom/msm8996-sony-xperia-tone.dtsi
> @@ -991,10 +991,6 @@ touch_int_sleep: touch-int-sleep-state {
>   	};
>   };
>   
> -/*
> - * For reasons that are currently unknown (but probably related to fusb301), USB takes about
> - * 6 minutes to wake up (nothing interesting in kernel logs), but then it works as it should.
> - */
>   &usb3 {
>   	status = "okay";
>   	qcom,select-utmi-as-pipe-clk;
> @@ -1003,6 +999,7 @@ &usb3 {
>   &usb3_dwc3 {
>   	extcon = <&usb3_id>;
>   	dr_mode = "peripheral";
> +	maximum-speed = "high-speed";
>   	phys = <&hsusb_phy1>;
>   	phy-names = "usb2-phy";
>   	snps,hird-threshold = /bits/ 8 <0>;


Reviewed-by: Neil Armstrong <neil.armstrong@...aro.org>