On 06/19/2014 05:53 PM, David Laight wrote:
> From: Daniel Mack [mailto:dan...@zonque.org]
>> On 06/19/2014 05:07 PM, Felipe Balbi wrote:
>>> On Wed, Jun 18, 2014 at 11:36:43AM +0200, Daniel Mack wrote:
On 06/18/2014 11:32 AM, David Laight wrote:
> You can't really mean nanoseconds?
t: 18 June 2014 10:28
> >>>> To: ba...@ti.com; george.cher...@ti.com; bige...@linutronix.de
> >>>> Cc: sebastian.reim...@googlemail.com; linux-usb@vger.kernel.org; Daniel
> >>>> Mack
> >>>> Subject: [PATCH 2/2] usb: musb: cppi41: fire hrtimer acc
r...@ti.com; bige...@linutronix.de
>>>> Cc: sebastian.reim...@googlemail.com; linux-usb@vger.kernel.org; Daniel
>>>> Mack
>>>> Subject: [PATCH 2/2] usb: musb: cppi41: fire hrtimer according to
>>>> programmed channel length
>>>>
>>>>
email.com; linux-usb@vger.kernel.org; Daniel
> >> Mack
> >> Subject: [PATCH 2/2] usb: musb: cppi41: fire hrtimer according to
> >> programmed channel length
> >>
> >> The musb/cppi41 code installs a hrtimer to work around DMA completion
> >
On 06/18/2014 11:32 AM, David Laight wrote:
> From: Of Daniel Mack
>> Sent: 18 June 2014 10:28
>> To: ba...@ti.com; george.cher...@ti.com; bige...@linutronix.de
>> Cc: sebastian.reim...@googlemail.com; linux-usb@vger.kernel.org; Daniel Mack
>> Subject: [PATCH 2/2] usb:
From: Of Daniel Mack
> Sent: 18 June 2014 10:28
> To: ba...@ti.com; george.cher...@ti.com; bige...@linutronix.de
> Cc: sebastian.reim...@googlemail.com; linux-usb@vger.kernel.org; Daniel Mack
> Subject: [PATCH 2/2] usb: musb: cppi41: fire hrtimer according to programmed
> channel
The musb/cppi41 code installs a hrtimer to work around DMA completion
interrupts that have fired too early on AM335x hardware. This timer
is currently programmed to first fire 140 nanoseconds after the DMA
completion callback. According to the commit which introduced it
(a655f481d83, "usb: musb: mu
