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

[Christian Lamparter]

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>