linux-kernel - Re: [PATCH 3/8] usb: dwc3: core: Skip setting event buffers for host only controllers

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Message-ID: <eb6b3c79-8d76-f70c-43b4-d190c892b4a3@gmail.com>
Date:   Sun, 12 Mar 2023 12:33:42 +0300
From:   Sergei Shtylyov <sergei.shtylyov@...il.com>
To:     Krishna Kurapati <quic_kriskura@...cinc.com>,
        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>
Cc:     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_wcheng@...cinc.com, quic_jackp@...cinc.com,
        quic_harshq@...cinc.com, ahalaney@...hat.com,
        quic_shazhuss@...cinc.com
Subject: Re: [PATCH 3/8] usb: dwc3: core: Skip setting event buffers for host
 only controllers

On 3/10/23 7:34 PM, Krishna Kurapati wrote:

> On some SoC's like SA8295P where the teritiary controller is host-only

   Likewise, tertiary. :-)

> capable, GEVTADDRHI/LO, GEVTSIZ, GEVTCOUNT registers are not accessible.
> Trying to setup them up during core_init leads to a crash.
> 
> For DRD/Peripheral supported controllers, event buffer setup is done
> again in gadget_pullup. Skip setup or cleanup of event buffers if
> controller is host-only capable.
> 
> Signed-off-by: Krishna Kurapati <quic_kriskura@...cinc.com>
[...]

MBR, Sergey