Depends on the device platform, a register read/write may take a few microseconds to complete. A register read on a HAPS platform takes ~2us where as register write takes less than 1us. These delays impact performance of small transfers or interface(s) with many endpoints such as UASP interface. For large transfer size and low rate of events generated, this series does not make much of a difference. This series avoids register read/write operations where they are not needed. On the HAPS platform with UASP in SSP Gen 2x2 speed, we observed almost double in performance speed when testing 4KB transfers reading and writing. Thinh Nguyen (3): usb: dwc3: gadget: Skip checking Update Transfer status usb: dwc3: gadget: Ignore Update Transfer cmd params usb: dwc3: gadget: Skip reading GEVNTSIZn drivers/usb/dwc3/gadget.c | 33 ++++++++++++++++++++++----------- 1 file changed, 22 insertions(+), 11 deletions(-) base-commit: 4d012040161cba054208555300d9fdf2b8925c34 -- 2.28.0
