linux-kernel - Re: [PATCH 1/2] usb: dwc3: gadget: Fix full speed mode

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Message-ID: <87h96flxj4.fsf@linux.intel.com>
Date:   Wed, 07 Dec 2016 14:43:43 +0200
From:   Felipe Balbi <balbi@...nel.org>
To:     Roger Quadros <rogerq@...com>, John Youn <johnyoun@...opsys.com>
Cc:     linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] usb: dwc3: gadget: Fix full speed mode


Hi,

Roger Quadros <rogerq@...com> writes:
>>> Roger Quadros <rogerq@...com> writes:
>>>> DCFG.DEVSPD == 0x3 is not valid and we need to set
>>>> DCFG.DEVSPD to 0x1 for full speed mode.
>>>
>>> seems like it has been made invalid somewhere between 1.73a and
>>> 2.60a. Can you figure it out from Documentation why and when it was made
>>> invalid? We might need revision checks here.
>>>
>> 
>> I'll try to dig out more.
>
> I couldn't figure out more information on this. The changelogs in the TRMs
> don't capture this change and I don't have access to all TRM versions
> so I can't say which version it got changed and why.
>
> Can we please involve someone from Synopsis to provide this information?
> Thanks.

John, could you help us with this query? We'd like to understand why one
of the FULLSPEED modes got removed. Do we need a revision check or can
we assume that the other mode was never supposed to be used?

thanks

-- 
balbi

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