linux-kernel - Re: [PATCH v2 2/2] phy: qualcomm: phy-qcom-eusb2-repeater: Don't zero-out registers

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Message-ID: <aFE0Nu8CKFBlCCrd@linaro.org>
Date: Tue, 17 Jun 2025 12:24:06 +0300
From: Abel Vesa <abel.vesa@...aro.org>
To: Luca Weiss <luca.weiss@...rphone.com>
Cc: 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>,
	Konrad Dybcio <konradybcio@...nel.org>,
	linux-arm-msm@...r.kernel.org, linux-phy@...ts.infradead.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	Konrad Dybcio <konrad.dybcio@....qualcomm.com>,
	Neil Armstrong <neil.armstrong@...aro.org>
Subject: Re: [PATCH v2 2/2] phy: qualcomm: phy-qcom-eusb2-repeater: Don't
 zero-out registers

On 25-06-17 10:26:36, 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")
> Reviewed-by: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
> Reviewed-by: Neil Armstrong <neil.armstrong@...aro.org>
> Signed-off-by: Luca Weiss <luca.weiss@...rphone.com>

Reviewed-by: Abel Vesa <abel.vesa@...aro.org>