[PATCH v2 0/5] usb: Add quirk for writing high-low order

Daehwan Jung
2024-05-31T06:07:14Z

There's the limitation of Synopsys dwc3 controller with ERST programming in
supporting separate ERSTBA_HI and ERSTBA_LO programming. It's supported when
the ERSTBA is programmed ERSTBA_HI before ERSTBA_LO. But, writing operations
in xHCI is done low-high order following xHCI spec. xHCI specification 5.1
"Register Conventions" states that 64 bit registers should be written in
low-high order. Synopsys dwc3 needs workaround for high-low order. That's why
I add new quirk to support this.

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Changes in v2:
- add a quirk in dwc3
- add dt-bindings of dwc3/xhci
- set the quirk in xhci-plat from dwc3
Link to v1: https://lore.kernel.org/r/1716875836-186791-1-git-send-email-dh10.jung@samsung.com/

Changes in v1:
- add a quirk in xhci
- use the quirk for programming ERST high-low order
Link to RFC: https://lore.kernel.org/r/1716339839-44022-1-git-send-email-dh10.jung@samsung.com/

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Daehwan Jung (5):
dt-bindings: usb: snps,dwc3: Add 'snps,xhci-write-64-hi-lo-quirk'
quirk
usb: dwc3: Support quirk for writing high-low order
dt-bindings: usb: xhci: Add 'write-64-hi-lo-quirk' quirk
xhci: Add a quirk for writing ERST in high-low order
usb: host: xhci-plat: Add support for XHCI_WRITE_64_HI_LO_QUIRK

Documentation/devicetree/bindings/usb/snps,dwc3.yaml | 5 +++++
Documentation/devicetree/bindings/usb/usb-xhci.yaml | 4 ++++
drivers/usb/dwc3/core.c | 3 +++
drivers/usb/dwc3/core.h | 2 ++
drivers/usb/dwc3/host.c | 5 ++++-
drivers/usb/host/xhci-mem.c | 5 ++++-
drivers/usb/host/xhci-plat.c | 3 +++
drivers/usb/host/xhci.h | 2 ++
8 files changed, 27 insertions(+), 2 deletions(-)

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2.7.4