[U-Boot] [PATCH] usb: dwc2: retry NAK'd interrupt transfers

[Marek Vasut]

On Sunday, April 12, 2015 at 05:52:02 AM, Stephen Warren wrote:
> IIUC, interrupt transfers are NAK'd by devices until they wish to trigger
> an interrupt, and e.g. EHCI controllers retry these in HW until they are
> ACK'd. However, DWC2 doesn't seem to retry, so we need to do this in SW.
> In practice, I've seen DWC2_HCINT_FRMOVRUN happen too. I'm not quite sure
> what this error implies; perhaps it's related to how near the end of a
> USB frame we're at when the interrupt transfer is initiated? Anyway,
> retrying this temporary error seems to be necessary too.
> 
> With all these commits applied, both my USB keyboards (one LS Lenovo and
> one FS Dell) work correctly when there is no USB hub between the SoC and
> the keyboard; We still need split transactions to be implemented for hubs
> to work.
> 
> Signed-off-by: Stephen Warren <swarren at wwwdotorg.org>

Applied to u-boot-usb/topic/dwc2 , thanks!

Best regards,
Marek Vasut