On Sat, Jul 21, 2018 at 03:58:40PM +0530, Anurag Kumar Vulisha wrote: > By default when core sees any transaction error(CRC or overflow) > it replies with terminating retry ACK (Retry=1 and Nump == 0). > Enabling this Auto Retry feature in controller, on seeing any > transaction errors makes the core to send an non-terminating ACK > transaction packet (that is, ACK TP with Retry=1 and Nump != 0). > Doing so will give controller a chance to recover from the error > condition. > > Signed-off-by: Anurag Kumar Vulisha <anurag.kumar.vuli...@xilinx.com> > --- > Documentation/devicetree/bindings/usb/dwc3.txt | 5 +++++ > drivers/usb/dwc3/core.c | 16 ++++++++++++++++ > drivers/usb/dwc3/core.h | 6 ++++++ > 3 files changed, 27 insertions(+) > > diff --git a/Documentation/devicetree/bindings/usb/dwc3.txt > b/Documentation/devicetree/bindings/usb/dwc3.txt > index 7f13ebe..2ba2bc2 100644 > --- a/Documentation/devicetree/bindings/usb/dwc3.txt > +++ b/Documentation/devicetree/bindings/usb/dwc3.txt > @@ -94,6 +94,11 @@ Optional properties: > this and tx-thr-num-pkt-prd to a valid, non-zero value > 1-16 (DWC_usb31 programming guide section 1.2.3) to > enable periodic ESS TX threshold. > + - snps,enable_auto_retry: Set to enable Auto retry Feature to make the
s/_/-/ > + controller operating in Host mode on seeing transaction > + errors(CRC errors or internal overrun scenerios) on IN > + transfers to reply to the device with a non-terminating > + retry ACK (i.e, an ACK TP with Retry=1 & Nump != 0) Seems like the property is unnecessary. When would you not want this retry behavior? Why not just enable unconditionally in the driver? Rob
