linux-kernel - Re: [PATCH] phy: qualcomm: phy-qcom-eusb2-repeater: rework reg override handler

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <v6cra77j7q7gwwqcdylrp6eegdkcgtlhxbtvehfxhvdnaahp6q@emcwrbbzhyyf>
Date: Sun, 6 Apr 2025 23:30:59 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Pengyu Luo <mitltlatltl@...il.com>
Cc: Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>, Vinod Koul <vkoul@...nel.org>,
        Kishon Vijay Abraham I <kishon@...nel.org>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-phy@...ts.infradead.org
Subject: Re: [PATCH] phy: qualcomm: phy-qcom-eusb2-repeater: rework reg
 override handler

On Sun, Apr 06, 2025 at 01:43:18AM +0800, Pengyu Luo wrote:
> In downstream tree, many registers need to be overrided, it varies
> from devices and platforms, not only HS trasmit amplitude(0x51),
> HS disconnect threshold(0x53), Tx pre-emphasis tuning(0x57).
> 
> The device I plan to upstream also uses it, so I write the patch for
> it (Oneplus Pad Pro / Oneplus Pad 2, sm8650-mtp based).
> 
> In upstream, only Sony Xperia 1 V is using this, so fixing it for sony,
> in downstream, some crd, mtp, htk devices also use it, I have no
> such device, don't set it for them.
> 
> Signed-off-by: Pengyu Luo <mitltlatltl@...il.com>
> ---
>  .../qcom/sm8550-sony-xperia-yodo-pdx234.dts   |  5 +-
>  .../phy/qualcomm/phy-qcom-eusb2-repeater.c    | 86 +++++++++++++++----
>  2 files changed, 72 insertions(+), 19 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/qcom/sm8550-sony-xperia-yodo-pdx234.dts b/arch/arm64/boot/dts/qcom/sm8550-sony-xperia-yodo-pdx234.dts
> index d90dc7b37..99f5fd32c 100644
> --- a/arch/arm64/boot/dts/qcom/sm8550-sony-xperia-yodo-pdx234.dts
> +++ b/arch/arm64/boot/dts/qcom/sm8550-sony-xperia-yodo-pdx234.dts
> @@ -673,9 +673,8 @@ cam_pwr_a_cs: cam-pwr-a-cs-state {
>  };
>  
>  &pm8550b_eusb2_repeater {
> -	qcom,tune-usb2-disc-thres = /bits/ 8 <0x6>;
> -	qcom,tune-usb2-amplitude = /bits/ 8 <0xf>;
> -	qcom,tune-usb2-preem = /bits/ 8 <0x7>;
> +	qcom,param-override-seq = <0x51 0x08 0x53 0x06 0x57 0x07>;
> +	qcom,host-param-override-seq = <0x51 0x08 0x53 0x06 0x57 0x07>;

Other than Krzysztof's comments: In upstream we describe invididual
properties / overrides rather than just dumping the whole register
sequence. So, using a single 'seq' property is not acceptable.

>  	vdd18-supply = <&pm8550_l15>;
>  	vdd3-supply = <&pm8550_l5>;
>  };

-- 
With best wishes
Dmitry