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| author |   Wesley Cheng <wcheng@codeaurora.org> | 2021-07-10 02:13:12 -0700 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-07-12 09:37:26 +0200 |
| commit | 9f607a309fbe95fc1f77acce5af70766a7142537 (patch) | |
| tree | ba69cbac920359c83384bc030f11999d2e274c95 /drivers/usb/dwc3/ep0.c | |
| parent | usb: gadget: configfs: Check USB configuration before adding (diff) | |
| download | linux-dev-9f607a309fbe95fc1f77acce5af70766a7142537.tar.xz linux-dev-9f607a309fbe95fc1f77acce5af70766a7142537.zip | |
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>
Diffstat (limited to 'drivers/usb/dwc3/ep0.c')
| -rw-r--r-- | drivers/usb/dwc3/ep0.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/usb/dwc3/ep0.c b/drivers/usb/dwc3/ep0.c index 3cd294264372..d28d08532455 100644 --- a/drivers/usb/dwc3/ep0.c +++ b/drivers/usb/dwc3/ep0.c @@ -619,6 +619,8 @@ static int dwc3_ep0_set_config(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl) return -EINVAL; case USB_STATE_ADDRESS: + dwc3_gadget_clear_tx_fifos(dwc); + ret = dwc3_ep0_delegate_req(dwc, ctrl); /* if the cfg matches and the cfg is non zero */ if (cfg && (!ret || (ret == USB_GADGET_DELAYED_STATUS))) { |