usb: dwc3: Workaround isoc start_transfer failure

DWC_usb31 peripheral v1.70a-ea06 and prior needs a SW workaround for isoc START TRANSFER command failure. This patch series implements that workaround

Change in v7:
- Rebased on Felipe's branch
Change in v6:
- Defined more version types in "usb: dwc3: Track DWC_usb31 VERSIONTYPE"
- Minor cleanup/fix in "usb: dwc3: Add workaround for isoc start transfer failure"
Change in v5:
- Splitted and resent from an old patch series
- Cleanup and fixed review issues
Change in v4:
- None
Change in v3:
- None
Change in v2:
- None

Thinh Nguyen (2):
usb: dwc3: Add disabling of start_transfer failure quirk
usb: dwc3: Add workaround for isoc start transfer failure

 Documentation/devicetree/bindings/usb/dwc3.txt |   3 +
 drivers/usb/dwc3/core.c                        |   2 +
 drivers/usb/dwc3/core.h                        |  13 +++
 drivers/usb/dwc3/gadget.c                      | 131 +++++++++++++++++++++++++
 4 files changed, 149 insertions(+)

2.11.0

DWC_usb31 peripheral v1.70a-ea06 and prior needs a SW workaround for isoc START TRANSFER command failure. However, some affected versions may have RTL patches to fix this without a SW workaround. Add this quirk to disable the SW workaround when it is not needed.

Synopsys STAR 9001202023: Wrong microframe number for isochronous IN endpoints.

---
 Documentation/devicetree/bindings/usb/dwc3.txt | 3 +++
 1 file changed, 3 insertions(+)

index 7e33e53e7c29..8e5265e9f658 100644
@@ -39,6 +39,9 @@ Optional properties:
  - resets: a single pair of phandle and reset specifier
  - snps,usb2-lpm-disable: indicate if we don't want to enable USB2 HW LPM
  - snps,usb3_lpm_capable: determines if platform is USB3 LPM capable
+ - snps,dis-start-transfer-quirk: when set, disable isoc START TRANSFER command
+			failure SW work-around for DWC_usb31 version 1.70a-ea06
+			and prior.
  - snps,disable_scramble_quirk: true when SW should disable data scrambling.
 	Only really useful for FPGA builds.
  - snps,has-lpm-erratum: true when DWC3 was configured with LPM Erratum enabled

2.11.0