diff options
| author | Thinh Nguyen <Thinh.Nguyen@synopsys.com> | 2021-04-12 20:00:45 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-04-14 15:57:44 +0200 |
| commit | e66bbfb0fbbe53ce0144b6715fa0c4c27e3784ae (patch) | |
| tree | bde26f81cf9c874aee323e87fe87aa5a64cb3866 /drivers/usb/dwc3/gadget.c | |
| parent | 8f23fe35ff1e5491b4d279323a8209a31f03ae65 (diff) | |
| download | lwn-e66bbfb0fbbe53ce0144b6715fa0c4c27e3784ae.tar.gz lwn-e66bbfb0fbbe53ce0144b6715fa0c4c27e3784ae.zip | |
usb: dwc3: gadget: Ignore Packet Pending bit
Currently the controller handles single stream only. So, Ignore Packet
Pending bit for stream selection and don't search for another stream if
the host sends Data Packet with PP=0 (for OUT direction) or ACK with
NumP=0 and PP=0 (for IN direction). This slightly improves the stream
performance.
Acked-by: Felipe Balbi <balbi@kernel.org>
Signed-off-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
Link: https://lore.kernel.org/r/097ba9e104c143f7ba0195ebff29390ec3043692.1618282705.git.Thinh.Nguyen@synopsys.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/dwc3/gadget.c')
| -rw-r--r-- | drivers/usb/dwc3/gadget.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c index e1b04c976da5..ec7aabba962d 100644 --- a/drivers/usb/dwc3/gadget.c +++ b/drivers/usb/dwc3/gadget.c @@ -2399,6 +2399,17 @@ static int __dwc3_gadget_start(struct dwc3 *dwc) dwc3_gadget_setup_nump(dwc); + /* + * Currently the controller handles single stream only. So, Ignore + * Packet Pending bit for stream selection and don't search for another + * stream if the host sends Data Packet with PP=0 (for OUT direction) or + * ACK with NumP=0 and PP=0 (for IN direction). This slightly improves + * the stream performance. + */ + reg = dwc3_readl(dwc->regs, DWC3_DCFG); + reg |= DWC3_DCFG_IGNSTRMPP; + dwc3_writel(dwc->regs, DWC3_DCFG, reg); + /* Start with SuperSpeed Default */ dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(512); |