Messages in this thread | | | Date | Sun, 6 Sep 2009 15:30:18 +0200 | From | Pierre Ossman <> | Subject | Re: QUIRK_FORCE_HISPD (was: Re: Ricoh R5C822 and QUIRK_FORCE_DMA) |
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On Sat, 1 Aug 2009 07:17:16 +0200 Tobias Diedrich <ranma@tdiedrich.de> wrote:
> Pierre Ossman wrote: > > > On a related note, I had a little time to play a bit more with my > > > R5C822 and found that I can also force-enable HISPD mode, which > > > boost performance further. > > > > > > > This seems odd. What frequency is the controller reporting? > > > > It could be that they originally wanted the controller to be > > high-speed, but that they had stability problems and turned it off. > > There is at least one other controller that went through that scenario. > > I assume thats host->max_clk? > The controller seems to report 33MHz for that value. >
Ah, then your controller is most likely not really high-speed. You're getting a bit more performance as you are forcing things out-of-spec and you're lucky enough that it still happens to work. :)
Rgds -- -- Pierre Ossman
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