linux-kernel - Re: [PATCH v3 5/5] phy: qcom: qmp-pcie: add x1e80100 qref supplies

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Message-ID: <5fd4abe7-3621-4119-9482-de823b247b0d@quicinc.com>
Date: Thu, 8 May 2025 16:50:30 +0800
From: Qiang Yu <quic_qianyu@...cinc.com>
To: Johan Hovold <johan@...nel.org>, Wenbin Yao <quic_wenbyao@...cinc.com>
CC: <catalin.marinas@....com>, <will@...nel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <andersson@...nel.org>,
        <konradybcio@...nel.org>, <robh@...nel.org>, <krzk+dt@...nel.org>,
        <conor+dt@...nel.org>, <linux-arm-msm@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <vkoul@...nel.org>, <kishon@...nel.org>, <sfr@...b.auug.org.au>,
        <linux-phy@...ts.infradead.org>, <krishna.chundru@....qualcomm.com>,
        <quic_vbadigan@...cinc.com>, <quic_mrana@...cinc.com>,
        <quic_cang@...cinc.com>, Johan Hovold <johan+linaro@...nel.org>,
        Abel Vesa
	<abel.vesa@...aro.org>
Subject: Re: [PATCH v3 5/5] phy: qcom: qmp-pcie: add x1e80100 qref supplies


On 5/8/2025 4:20 PM, Johan Hovold wrote:
> On Thu, May 08, 2025 at 04:15:14PM +0800, Wenbin Yao wrote:
>> From: Qiang Yu <quic_qianyu@...cinc.com>
>>
>> All PCIe PHYs on the X1E80100 SOC require the vdda-qref, which feeds QREF
>> clocks provided by the TCSR device.
> This still looks wrong and you never replied to why these supplies
> shouldn't be handled by the tcsr clock driver that supplies these
> clocks:
>
> 	https://lore.kernel.org/lkml/aBHUmXx6N72_sCH9@hovoldconsulting.com/
Sorry, I thought Konrad had convinced you.

If the TCSR driver manages these supplies, would it be possible for tscr
driver to recognize when it needs to turn vdda-qref on or off for a
specific PCIe port?
>
>> Hence, restore the vdda-qref request for the 6th PCIe instance by reverting
>> commit 031b46b4729b ("phy: qcom: qmp-pcie: drop bogus x1e80100 qref
>> supplies"). For the 4th PCIe instance (Gen3 x2), add a new driver data
>> entry, namely x1e80100_qmp_gen3x2_pciephy_cfg, which is a copy of
>> sm8550_qmp_gen3x2_pciephy_cfg but uses sm8550_qmp_phy_vreg_l instead.
>>
>> Fixes: 031b46b4729b ("phy: qcom: qmp-pcie: drop bogus x1e80100 qref supplies")
>> Fixes: 606060ce8fd0 ("phy: qcom-qmp-pcie: Add support for X1E80100 g3x2 and g4x2 PCIE")
>> Cc: Johan Hovold <johan+linaro@...nel.org>
>> Cc: Abel Vesa <abel.vesa@...aro.org>
>> Signed-off-by: Qiang Yu <quic_qianyu@...cinc.com>
>> Signed-off-by: Wenbin Yao <quic_wenbyao@...cinc.com>
> Johan

-- 
With best wishes
Qiang Yu