tree ba69cbac920359c83384bc030f11999d2e274c95
parent 7adf9e3adc398e5d5b7af91e5fdfafa70e86dd36
author Wesley Cheng <wcheng@codeaurora.org> 1625908392 -0700
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1626075446 +0200

usb: dwc3: Resize TX FIFOs to meet EP bursting requirements

Some devices have USB compositions which may require multiple endpoints
that support EP bursting.  HW defined TX FIFO sizes may not always be
sufficient for these compositions.  By utilizing flexible TX FIFO
allocation, this allows for endpoints to request the required FIFO depth to
achieve higher bandwidth.  With some higher bMaxBurst configurations, using
a larger TX FIFO size results in better TX throughput.

By introducing the check_config() callback, the resizing logic can fetch
the maximum number of endpoints used in the USB composition (can contain
multiple configurations), which helps ensure that the resizing logic can
fulfill the configuration(s), or return an error to the gadget layer
otherwise during bind time.

Signed-off-by: Wesley Cheng <wcheng@codeaurora.org>
Link: https://lore.kernel.org/r/1625908395-5498-4-git-send-email-wcheng@codeaurora.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>