linux-kernel - Re: [PATCH v2 4/4] phy: qcom: phy-qcom-snps-eusb2: Add extra register write for Milos

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Message-ID: <7d073433-f254-4d75-a68b-d184f900294a@oss.qualcomm.com>
Date: Thu, 10 Jul 2025 14:10:47 +0200
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Luca Weiss <luca.weiss@...rphone.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Wesley Cheng <quic_wcheng@...cinc.com>, Vinod Koul <vkoul@...nel.org>,
        Kishon Vijay Abraham I <kishon@...nel.org>,
        Abel Vesa <abel.vesa@...aro.org>
Cc: ~postmarketos/upstreaming@...ts.sr.ht, phone-devel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, linux-usb@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-phy@...ts.infradead.org,
        Neil Armstrong <neil.armstrong@...aro.org>
Subject: Re: [PATCH v2 4/4] phy: qcom: phy-qcom-snps-eusb2: Add extra register
 write for Milos

On 7/9/25 11:18 AM, Luca Weiss wrote:
> As per the downstream devicetree for Milos, add a register write for
> QCOM_USB_PHY_CFG_CTRL_1 as per the "eUSB2 HPG version 1.0.2 update".
> 
> Reviewed-by: Neil Armstrong <neil.armstrong@...aro.org>
> Signed-off-by: Luca Weiss <luca.weiss@...rphone.com>
> ---
> The downstream driver supports an arbitrary extra init sequence via
> qcom,param-override-seq.
> 
> volcano-usb.dtsi has the following which is implemented in this patch:
> 
>     /* eUSB2 HPG version 1.0.2 update */
>     qcom,param-override-seq =
>             <0x00 0x58>;
> ---
>  drivers/phy/phy-snps-eusb2.c | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/drivers/phy/phy-snps-eusb2.c b/drivers/phy/phy-snps-eusb2.c
> index e232b8b4d29100b8fee9e913e2124788af09f2aa..87fc086424ba4d9fb3ce870aa7f7971a51d4a567 100644
> --- a/drivers/phy/phy-snps-eusb2.c
> +++ b/drivers/phy/phy-snps-eusb2.c
> @@ -420,6 +420,12 @@ static int qcom_snps_eusb2_hsphy_init(struct phy *p)
>  	/* set default parameters */
>  	qcom_eusb2_default_parameters(phy);
>  
> +	if (of_device_is_compatible(p->dev.of_node, "qcom,milos-snps-eusb2-phy")) {
> +		/* eUSB2 HPG version 1.0.2 update */
> +		writel_relaxed(0x0, phy->base + QCOM_USB_PHY_CFG_CTRL_1);
> +		readl_relaxed(phy->base + QCOM_USB_PHY_CFG_CTRL_1);

Said HPG asks to clear bits [7:1] on all targets

Konrad