linux-kernel - Re: [PATCH v6 10/22] usb: dwc2: host: Properly set the HFIR

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Message-ID: <2B3535C5ECE8B5419E3ECBE30077290901DC43EE3C@US01WEMBX2.internal.synopsys.com>
Date:	Wed, 10 Feb 2016 02:08:45 +0000
From:	John Youn <John.Youn@...opsys.com>
To:	Doug Anderson <dianders@...omium.org>,
	Kever Yang <kever.yang@...k-chips.com>
CC:	John Youn <John.Youn@...opsys.com>, Felipe Balbi <balbi@...com>,
	吴良峰 <william.wu@...k-chips.com>,
	Tao Huang <huangtao@...k-chips.com>,
	Heiko Stübner <heiko@...ech.de>,
	Stefan Wahren <stefan.wahren@...e.com>,
	"open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>,
	"linux-rpi-kernel@...ts.infradead.org" 
	<linux-rpi-kernel@...ts.infradead.org>,
	Julius Werner <jwerner@...omium.org>,
	"Herrero, Gregory" <gregory.herrero@...el.com>,
	"Kaukab, Yousaf" <yousaf.kaukab@...el.com>,
	Dinh Nguyen <dinguyen@...nsource.altera.com>,
	"Alan Stern" <stern@...land.harvard.edu>,
	Ming Lei <ming.lei@...onical.com>,
	"Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v6 10/22] usb: dwc2: host: Properly set the HFIR

On 1/31/2016 2:19 PM, Doug Anderson wrote:
> Kever,
> 
> On Sun, Jan 31, 2016 at 1:23 AM, Kever Yang <kever.yang@...k-chips.com> wrote:
>> Doug,
>>
>> On 01/29/2016 10:20 AM, Douglas Anderson wrote:
>>>
>>> According to the most up to date version of the dwc2 databook, the FRINT
>>> field of the HFIR register should be programmed to:
>>> * 125 us * (PHY clock freq for HS) - 1
>>> * 1000 us * (PHY clock freq for FS/LS) - 1
>>
>> I got 3 version of dwc_otg databook, 2.74a, 2.94a and 3.10a,
>> all the doc describe the FrInt as:
> 
> Can you check to see if you can get 3.30a (October 2015)?
> 
> 
>> * 125 us * (PHY clock freq for HS)
>> * 1000 us * (PHY clock freq for FS/LS)
>>
>> Maybe John can help to check the design.
> 
> Yes, this really needs John or someone at Synopsys.
> 
> 

The "- 1" is the correct value. The databook was corrected in 3.30a
and this applies to all previous versions of the core.

John