Re: musb: cppi41: broken high speed FTDI functionality when connected to musb directly

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On Mon, Sep 30, 2019 at 09:54:11PM +0200, Sebastian Reichel wrote:
> Hi,
> 
> On Mon, Sep 30, 2019 at 08:23:30AM -0700, Tony Lindgren wrote:

> > Actually playing with the cppi41 timeout might be more suitable here,
> > they use the same module clock from what I remember though. So
> > maybe increase the cppi41 autosuspend_timeout from 100 ms to 500 ms
> > or higher:
> > 
> > # echo 500 > /sys/bus/platform/drivers/cppi41-dma-engine/47400000.dma-controller/power/autosuspend_delay_ms
> > 
> > If changing the autosuspend_timeout_ms value does not help, then
> > try setting control to on there.
> 
> I did not check the details, but from the cover-letter this might be
> woth looking into:
> 
> https://lore.kernel.org/lkml/20190930161205.18803-1-johan@xxxxxxxxxx/

No, that one should be unrelated as it would only prevent later suspends after
a driver has been unbound (and rebound).

Johan

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