> On Dec 27, 2014, at 15:23 , Robert Nelson <[email protected]> wrote:
>
> On Sat, Dec 27, 2014 at 4:52 PM, Chris Morgan <[email protected]> wrote:
>> That's kind of disappointing to hear. Pio sounds like it means a lot of
>> overhead if you are using a lot of usb bandwidth. I'm interested as we are
>> using a bit of usb and a usb audio codec...
>>
>> Is this issue something exclusive to the ti kernel or also in mainline?
>
> It's just the last few outlier bugs for the DMA controller behind the
> musb ip block..
>
> In v3.8.x we have PIO mode set by default too:
>
> CONFIG_USB_MUSB_DSPS=y
> CONFIG_MUSB_PIO_ONLY=y
>
> https://github.com/beagleboard/linux/blob/1b8cd64cf49960d835591de1fee2282494858fa6/arch/arm/configs/bb.org_defconfig#L3345
>
> So it's not really a regression from a v3.8.x -> v3.14.x upgrade point.
>
> But if we start getting a fair number of user problems, i'm prepared
> to push it back to pio mode quickly.
Oh, this might be the issue I was experiencing with the later kernel. In my
other email I just posted ("Changes in 3.19 (was: How to make BBB pins work
after Ubuntu Trusty install?)"), I talked about the 3.18 kernel, but I probably
meant 3.14. That was weeks ago and I just don't remember how I got to that
situation (either upgrading the kernel or building my own).
In any case, my USB audio dongle playback was terrible on a kernel >3.8.x,
works well on 3.8.
--
Rick Mann
[email protected]
--
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