linux-kernel - Re: [PATCH v4 5/6] phy: qcom: qmp-combo: register a typec mux to change the QMPPHY

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Message-ID: <ibrupwvn5frzb4vo3eukb7p7pzonaxwhygshz743wmyrbprkcq@xcpt4ryzvwqr>
Date: Sat, 9 Aug 2025 11:13:13 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Konrad Dybcio <konradybcio@...nel.org>
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>,
        Bjorn Andersson <andersson@...nel.org>,
        Marijn Suijten <marijn.suijten@...ainline.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 v4 5/6] phy: qcom: qmp-combo: register a typec mux to
 change the QMPPHY_MODE

On Thu, Aug 07, 2025 at 06:33:23PM +0200, Konrad Dybcio wrote:
> From: Neil Armstrong <neil.armstrong@...aro.org>
> 
> Register a typec mux in order to change the PHY mode on the Type-C
> mux events depending on the mode and the svid when in Altmode setup.
> 
> The DisplayPort phy should be left enabled if is still powered on
> by the DRM DisplayPort controller, so bail out until the DisplayPort
> PHY is not powered off.
> 
> The Type-C Mode/SVID only changes on plug/unplug, and USB SAFE states
> will be set in between of USB-Only, Combo and DisplayPort Only so
> this will leave enough time to the DRM DisplayPort controller to
> turn of the DisplayPort PHY.
> 
> Signed-off-by: Neil Armstrong <neil.armstrong@...aro.org>
> [konrad: renaming, rewording, bug fixes]
> Signed-off-by: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
> ---
>  drivers/phy/qualcomm/phy-qcom-qmp-combo.c | 118 ++++++++++++++++++++++++++++--
>  1 file changed, 113 insertions(+), 5 deletions(-)
> 
> +
> +	if (qmp->qmpphy_mode != QMPPHY_MODE_USB3_ONLY && qmp->dp_powered_on) {
> +		dev_dbg(qmp->dev, "typec_mux_set: DP PHY is still in use, delaying switch\n");
> +		return 0;
> +	}

I can't say that I'm fully happy about it, nevertheless:

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>


-- 
With best wishes
Dmitry