linux-kernel - Re: usb: musb: Scheduling of interrupt endpoints

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Message-ID: <5499835B.508@ridgerun.com>
Date:	Tue, 23 Dec 2014 08:59:39 -0600
From:	Carsten Behling <carsten.behling@...gerun.com>
To:	linux-usb@...r.kernel.org
CC:	balbi@...com, linux-kernel@...r.kernel.org
Subject: Re: usb: musb: Scheduling of interrupt endpoints

Would it help if I send a patch as a suggestion and as basis for discussion?

On 12/19/2014 01:38 PM, Carsten Behling wrote:
> Hi all,
>
> Long time ago, TI shipped a kernel named 
> linux-2.6.32.17-psp03.01.01.39 with an additional kernel option
> for scheduling of interrupt endpoints.
>
> AFAIK, this seems to be the only possibility to attach more that 4 in 
> endpoints to MUSB (at least on a DM368).
>
> This feature reserves one hardware endpoint unit to time schedule 
> interrupt in endpoints based
> on its bInterval value triggered by the SOF interrupt.
>
> I didn't find any discussion about adding such a feature to the 
> mainline kernel.
> IMHO, this feature is absolutely necessary. But there may be reasons, 
> not to add it (e.g. CPU load).
>
> Please let me know your thoughts and ideas.
>
> Best regards
> -Carsten
>

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