[LEDE-DEV] [PATCH 3/3] lantiq: add device tree binding for dwc2 on danube

[Ben Mulvihill]

On Sat, 2016-10-29 at 22:18 +0200, Christian Lamparter wrote:
> On Saturday, October 29, 2016 8:44:27 PM CEST Christian Lamparter wrote:
> > [...] 
> > [    7.849577] dwc2 1e101000.ifxhcd: Mode Mismatch Interrupt: currently in Host mode
> > [    7.855582] dwc2 1e101000.ifxhcd: Mode Mismatch Interrupt: currently in Host mode
> > [    7.862820] dwc2 1e101000.ifxhcd: Mode Mismatch Interrupt: currently in Host mode
> > [    8.051083] usb 1-1: new high-speed USB device number 2 using dwc2
> > [    8.055952] dwc2 1e101000.ifxhcd: Mode Mismatch Interrupt: currently in Host mode
> > [    8.063064] dwc2 1e101000.ifxhcd: Mode Mismatch Interrupt: currently in Host mode
> >
> > Now, there has been recent changes to dwc2 which might fix these pesky
> > errors. The discussion can be found on the LKML [3] and three patches
> > were committed to 4.9-rc.
> > 
> > usb: dwc2: Properly account for the force mode delays [4]
> > usb: dwc2: Add delay to core soft reset [5]
> > usb: dwc2: gadget: Only initialize device if in device mode [6]
> > 
> > I'll give then a try and see test if they help. Otherwise:
> 
> Not much. There are now just four "Mode Mismatch Interrupt" instead of five.
> 
> I did a short 400MiB read speed test from a fast usb stick.
> The dwc2 driver (with the param_ltq values) is faster than 
> ifxhcd.
> 
> ifxhcd:
> real 0m 23.26s
> user 0m 0.01s
> sys 0m 15.18s
> 
> dwc2:
> real 0m 16.31s
> user 0m 0.00s
> sys 0m 8.38s
> 
> Regards,
> Christian
>  
> > [4] <https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/drivers/usb/dwc2?id=2938fc63e0c26bf694436ac81bc776c8b7eced0c>
> > [5] <https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/drivers/usb/dwc2?id=fef6bc37dbafe0d6d71c808c8867a8c5ab4b9816>
> > [6] <https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/drivers/usb/dwc2?id=d0f0ac56b34b28e80223d7086b4decdf027c27ed>

Thanks for testing this. It looks like we'll have to live with the
"mode mismatch" errors for the moment. I can certainly do a patch to 
add  dr_mode to the dts to get rid of the initial "Configuration 
mismatch" error at least. The same should also be done on ar9 -
I know the error appears there too. What about vrx?