linux-kernel - Re: [PATCH 7/8] usb: dwc3: qcom: Start USB in 'host mode' on the SDM845

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Date:   Wed, 5 Jun 2019 19:50:35 +0100
From:   Lee Jones <lee.jones@...aro.org>
To:     Jeffrey Hugo <jhugo@...eaurora.org>
Cc:     Bjorn Andersson <bjorn.andersson@...aro.org>, balbi@...nel.org,
        wsa+renesas@...g-engineering.com, gregkh@...uxfoundation.org,
        linus.walleij@...aro.org, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org, david.brown@...aro.org,
        alokc@...eaurora.org, kramasub@...eaurora.org,
        linux-i2c@...r.kernel.org, linux-gpio@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, andy.gross@...aro.org,
        jlhugo@...il.com, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 7/8] usb: dwc3: qcom: Start USB in 'host mode' on the
 SDM845

On Wed, 05 Jun 2019, Jeffrey Hugo wrote:

> On 6/5/2019 2:34 AM, Lee Jones wrote:
> > On Wed, 05 Jun 2019, Bjorn Andersson wrote:
> > 
> > > On Tue 04 Jun 03:44 PDT 2019, Lee Jones wrote:
> > > 
> > > > When booting with Device Tree, the current default boot configuration
> > > > table option, the request to boot via 'host mode' comes from the
> > > > "dr_mode" property.
> > > 
> > > This has been the default on the MTP, but this is changing as this is
> > > causing issues when connected downstream from a hub (the typical
> > > development case for the primary USB port of a phone like device) and
> > > more importantly we don't have support for the PMIC blocks that control
> > > VBUS.
> > 
> > My point is not about which mode is currently chosen.  It's more about
> > the capability of choosing which mode is appropriate for a given
> > system via DT.
> > 
> > > Once these issues are resolved the dr_mode would be "otg".
> > 
> > OTG doesn't work on this H/W, so we need to specify "host" mode.
> 
> How have you made that determination?

I enabled OTG and plugged in all of the things.

-- 
Lee Jones [李琼斯]
Linaro Services Technical Lead
Linaro.org │ Open source software for ARM SoCs
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