usb: Add support for txfifo threshold
CONFIG_USB_EHCI_TXFIFO_THRESH enables setting of the txfilltuning field in the EHCI controller on reset. Signed-off-by: NSimon Glass <sjg@chromium.org> Acked-by: NRemy Bohmer <linux@bohmer.net> Signed-off-by: NTom Warren <twarren@nvidia.com>
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