linux-kernel - Re: [PATCH v3 0/2] Skip phy initialization for DWC3 USB Controllers

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Message-ID: <YmEL3WnyM7sa8VP9@kuha.fi.intel.com>
Date:   Thu, 21 Apr 2022 10:46:37 +0300
From:   Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To:     Mathias Nyman <mathias.nyman@...ux.intel.com>
Cc:     "Sandeep Maheswaram (Temp) (QUIC)" <quic_c_sanm@...cinc.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Felipe Balbi <balbi@...nel.org>,
        Stephen Boyd <swboyd@...omium.org>,
        Doug Anderson <dianders@...omium.org>,
        Matthias Kaehlcke <mka@...omium.org>,
        Mathias Nyman <mathias.nyman@...el.com>,
        "linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Pavan Kumar Kondeti (QUIC)" <quic_pkondeti@...cinc.com>,
        "Pratham Pratap (QUIC)" <quic_ppratap@...cinc.com>,
        "Krishna Kurapati PSSNV (QUIC)" <quic_kriskura@...cinc.com>,
        "Vidya Sagar Pulyala (Temp) (QUIC)" <quic_vpulyala@...cinc.com>
Subject: Re: [PATCH v3 0/2] Skip phy initialization for DWC3 USB Controllers

On Wed, Apr 20, 2022 at 04:20:52PM +0300, Mathias Nyman wrote:
> On 19.4.2022 13.17, Sandeep Maheswaram (Temp) (QUIC) wrote:
> > Hi Mathias, Felipe,
> > 
> >> -----Original Message-----
> >> From: Sandeep Maheswaram (Temp) (QUIC) <quic_c_sanm@...cinc.com>
> >> Sent: Thursday, April 7, 2022 3:01 PM
> >> To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>; Felipe Balbi
> >> <balbi@...nel.org>; Stephen Boyd <swboyd@...omium.org>; Doug
> >> Anderson <dianders@...omium.org>; Matthias Kaehlcke
> >> <mka@...omium.org>; Mathias Nyman <mathias.nyman@...el.com>
> >> Cc: linux-arm-msm@...r.kernel.org; linux-usb@...r.kernel.org; linux-
> >> kernel@...r.kernel.org; Pavan Kumar Kondeti (QUIC)
> >> <quic_pkondeti@...cinc.com>; Pratham Pratap (QUIC)
> >> <quic_ppratap@...cinc.com>; Krishna Kurapati PSSNV (QUIC)
> >> <quic_kriskura@...cinc.com>; Vidya Sagar Pulyala (Temp) (QUIC)
> >> <quic_vpulyala@...cinc.com>; Sandeep Maheswaram (Temp) (QUIC)
> >> <quic_c_sanm@...cinc.com>
> >> Subject: [PATCH v3 0/2] Skip phy initialization for DWC3 USB Controllers
> >>
> >> Runtime suspend of phy drivers was failing from DWC3 driver as runtime
> >> usage value is 2 because the phy is initialized from
> >> DWC3 core and HCD core.
> >> Some controllers like DWC3 and CDNS3 manage phy in their core drivers.
> >> This property can be set to avoid phy initialization in HCD core.
> >>
> >> v3:
> >> Coming back to this series based on discussion at below thread
> >> https://patchwork.kernel.org/project/linux-arm-msm/patch/1648103831-
> >> 12347-4-git-send-email-quic_c_sanm@...cinc.com/
> >> Dropped the dt bindings PATCH 1/3 in v2
> >> https://patchwork.kernel.org/project/linux-arm-msm/cover/1636353710-
> >> 25582-1-git-send-email-quic_c_sanm@...cinc.com/
> >>
> >> v2:
> >> Updated the commit descriptions.
> >> Changed subject prefix from dwc to dwc3.
> >> Increased props array size.
> >>
> >> Sandeep Maheswaram (2):
> >>   usb: host: xhci-plat: Add device property to set XHCI_SKIP_PHY_INIT
> >>     quirk
> >>   usb: dwc3: host: Set the property usb-skip-phy-init
> >>
> >>  drivers/usb/dwc3/host.c      | 4 +++-
> >>  drivers/usb/host/xhci-plat.c | 3 +++
> >>  2 files changed, 6 insertions(+), 1 deletion(-)
> >>
> >> --
> >> 2.7.4
> > 
> > Please let me know your opinion about this series.
> 
> Otherwise looks good but wondering if we should document that new device
> property somewhere. 
> 
> Couldn't find a standard way how those device properties excluded from
> Documentation/devicetree/binding are documented

Couldn't it be just documented in drivers/usb/host/xhci-plat.c for now?

thanks,

-- 
heikki