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

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Message-ID: <5499C4E2.8090407@ridgerun.com>
Date:	Tue, 23 Dec 2014 13:39:14 -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

The following comment can be found in 'musb_schedule()':

'* REVISIT what we really want here is a regular schedule tree
  * like e.g. OHCI uses.'

So I assume the best practice would be to make an implementation based
on the code in in ohci-q.c. And it would be waste of time to port the old
interrupt endpoint scheduling feature of TI.

Am I right?

On 12/23/2014 08:59 AM, Carsten Behling wrote:
> 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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