linux-kernel - Re: [PATCH v2 2/2] Revert "usb: dwc3: Don't switch OTG -> peripheral if extcon is present"

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Date:   Mon, 3 Oct 2022 21:57:35 +0000
From:   Thinh Nguyen <Thinh.Nguyen@...opsys.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
CC:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andrey Smirnov <andrew.smirnov@...il.com>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Felipe Balbi <balbi@...nel.org>, Ferry Toth <fntoth@...il.com>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: Re: [PATCH v2 2/2] Revert "usb: dwc3: Don't switch OTG -> peripheral
 if extcon is present"

Hi Andy,

On Tue, Sep 27, 2022, Andy Shevchenko wrote:
> This reverts commit 0f01017191384e3962fa31520a9fd9846c3d352f.
> 
> As pointed out by Ferry this breaks Dual Role support on
> Intel Merrifield platforms.

Can you provide more info than this (any debug info/description)? It
will be difficult to come back to fix with just this to go on. The
reverted patch was needed to fix a different issue.

Thanks,
Thinh

> 
> Fixes: 0f0101719138 ("usb: dwc3: Don't switch OTG -> peripheral if extcon is present")
> Reported-by: Ferry Toth <fntoth@...il.com>
> Cc: stable@...r.kernel.org
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> Tested-by: Ferry Toth <fntoth@...il.com> # for Merrifield
> ---
>  drivers/usb/dwc3/core.c | 55 +----------------------------------------
>  drivers/usb/dwc3/drd.c  | 50 +++++++++++++++++++++++++++++++++++++
>  2 files changed, 51 insertions(+), 54 deletions(-)