linux-kernel - Re: [PATCH v13 05/10] usb: dwc3: qcom: Refactor IRQ handling in QCOM Glue driver

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Date:   Wed, 15 Nov 2023 23:12:16 +0530
From:   Krishna Kurapati PSSNV <quic_kriskura@...cinc.com>
To:     Johan Hovold <johan@...nel.org>
CC:     Thinh Nguyen <Thinh.Nguyen@...opsys.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        "Andy Gross" <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        "Konrad Dybcio" <konrad.dybcio@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Felipe Balbi <balbi@...nel.org>,
        Wesley Cheng <quic_wcheng@...cinc.com>,
        <linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-msm@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <quic_pkondeti@...cinc.com>, <quic_ppratap@...cinc.com>,
        <quic_jackp@...cinc.com>, <ahalaney@...hat.com>,
        <quic_shazhuss@...cinc.com>
Subject: Re: [PATCH v13 05/10] usb: dwc3: qcom: Refactor IRQ handling in QCOM
 Glue driver

Hi Johan,

> Are you sure there's no support for hs_phy_irq also in the "femto" PHYs
> and that it's just that there is currently no driver support for using
> them?
> 
> And why is it defined if there is truly no use for it?
> 

We had an internal sync up with HW folks and here is some baseline 
suggestions we received:

If DP/DM interrupts are defined, then that is the preferred path to 
used, irrespective if HS Phy irq is defined or not / or whether it is 
Femto / QUSB2 target. There is no target that has femto phy but misses 
DP/DM today.

For cases like sdm660/msm8998/msm8953/msm8956, these targets use 
hs_phy_irq only and don't rely on DP/DM. So we cannot remove the binding 
in entirety.

> Also, if hs_phy_irq and dp/dm_phy_irq were mutually exclusive, why does
> the following Qualcomm SoCs define all three?
> 

HS Phy Irq is redundant or functionality is mutually exclusive in this 
case. If there are targets that define all three, then we need to update 
those to only utilize DP/DM interrupts.

Regards,
Krishna,