linux-kernel - Re: [PATCH] usb: dwc2: host: Properly set the HFIR

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Message-ID: <39287239.yyU0LGezZt@phil>
Date:	Sat, 23 Jan 2016 18:53:37 +0100
From:	Heiko Stuebner <heiko@...ech.de>
To:	Douglas Anderson <dianders@...omium.org>
Cc:	John Youn <John.Youn@...opsys.com>, balbi@...com,
	kever.yang@...k-chips.com, william.wu@...k-chips.com,
	huangtao@...k-chips.com, linux-rockchip@...ts.infradead.org,
	Julius Werner <jwerner@...omium.org>,
	gregory.herrero@...el.com, yousaf.kaukab@...el.com,
	dinguyen@...nsource.altera.com, stern@...land.harvard.edu,
	ming.lei@...onical.com, johnyoun@...opsys.com,
	gregkh@...uxfoundation.org, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] usb: dwc2: host: Properly set the HFIR

Am Freitag, 22. Januar 2016, 15:56:10 schrieb Douglas Anderson:
> 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
> 
> This is opposed to older versions of the doc that claimed it should be:
> * 125 us * (PHY clock freq for HS)
> * 1000 us * (PHY clock freq for FS/LS)
> 
> In case you didn't spot it, the difference is the "- 1".
> 
> Let's add the "- 1" to match the newest user manual.  It's presumed that
> the "- 1" should have always been there and that this was always a
> documentation error.  If some hardware needs the "- 1" and other
> hardware doesn't, we'll have to add a configuration parameter for it in
> the future.

Same setup and description as in Doug's 21-patch series, so on a
veyron-jerry:

Tested-by: Heiko Stuebner <heiko@...ech.de>


Heiko