usb: dwc3: gadget: Reduce register read/write operations
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- v1 Latest3 patches 0 repliesNew
Patches in v1 No applies recorded yet
| # | Subject and files | Size | Replies | Applied |
|---|---|---|---|---|
| 1/3 | usb: dwc3: gadget: Skip checking Update Transfer statusdrivers/ | +7 | 0 replies | |
| 2/3 | usb: dwc3: gadget: Ignore Update Transfer cmd paramsdrivers/ | +11 | 0 replies | |
| 3/3 | usb: dwc3: gadget: Skip reading GEVNTSIZndrivers/ | +4 | 0 replies |
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Cover letter [PATCH 0/3] usb: dwc3: gadget: Reduce register read/write operations
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
Signature · 1 line
2.28.0