On Wed, Apr 19, 2017 at 08:11:38PM +0800, William Wu wrote: > This patch adds a quirk to disable USB 2.0 MAC linestate check > during HS transmit. Refer the dwc3 databook, we can use it for > some special platforms if the linestate not reflect the expected > line state(J) during transmission. > > When use this quirk, the controller implements a fixed 40-bit > TxEndDelay after the packet is given on UTMI and ignores the > linestate during the transmit of a token (during token-to-token > and token-to-data IPGAP). > > On some rockchip platforms (e.g. rk3399), it requires to disable > the u2mac linestate check to decrease the SSPLIT token to SETUP > token inter-packet delay from 566ns to 466ns, and fix the issue > that FS/LS devices not recognized if inserted through USB 3.0 HUB. > > Signed-off-by: William Wu <william.wu@xxxxxxxxxxxxxx> > --- > Changes in v3: > - change quirk name > - only read and write GUCTL1 if dwc3 version >= 2.50a > > Changes in v2: > - fix coding style > > Documentation/devicetree/bindings/usb/dwc3.txt | 2 ++ Acked-by: Rob Herring <robh@xxxxxxxxxx> > drivers/usb/dwc3/core.c | 20 ++++++++++++++------ > drivers/usb/dwc3/core.h | 4 ++++ > 3 files changed, 20 insertions(+), 6 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
