linux-kernel - Re: [PATCH 2/2] phy: qualcomm: phy-qcom-eusb2-repeater: Don't zero-out registers

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Message-ID: <bdb171c3-5395-414a-88cf-eb002af96804@oss.qualcomm.com>
Date: Mon, 16 Jun 2025 13:44:31 +0200
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Luca Weiss <luca.weiss@...rphone.com>, Vinod Koul <vkoul@...nel.org>,
        Kishon Vijay Abraham I <kishon@...nel.org>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley
 <conor+dt@...nel.org>, Abel Vesa <abel.vesa@...aro.org>,
        Konrad Dybcio <konradybcio@...nel.org>
Cc: linux-arm-msm@...r.kernel.org, linux-phy@...ts.infradead.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] phy: qualcomm: phy-qcom-eusb2-repeater: Don't
 zero-out registers

On 6/16/25 11:45 AM, Luca Weiss wrote:
> Zeroing out registers does not happen in the downstream kernel, and will
> "tune" the repeater in surely unexpected ways since most registers don't
> have a reset value of 0x0.
> 
> Stop doing that and instead just set the registers that are in the init
> sequence (though long term I don't think there's actually PMIC-specific
> init sequences, there's board specific tuning, but that's a story for
> another day).
> 
> Fixes: 99a517a582fc ("phy: qualcomm: phy-qcom-eusb2-repeater: Zero out untouched tuning regs")
> Signed-off-by: Luca Weiss <luca.weiss@...rphone.com>
> ---

Riiight I thought this was effectively reverted already..

Reviewed-by: Konrad Dybcio <konrad.dybcio@....qualcomm.com>

Konrad