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usb: dwc3: gadget: Ignore Packet Pending bit

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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>
This commit is contained in:
Thinh Nguyen 2021-04-12 20:00:45 -07:00 committed by Greg Kroah-Hartman
parent 8f23fe35ff
commit e66bbfb0fb
2 changed files with 12 additions and 0 deletions
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1
drivers/usb/dwc3/core.h
View File

@ -403,6 +403,7 @@
#define DWC3_DCFG_NUMP(n) (((n) >> DWC3_DCFG_NUMP_SHIFT) & 0x1f)
#define DWC3_DCFG_NUMP_MASK (0x1f << DWC3_DCFG_NUMP_SHIFT)
#define DWC3_DCFG_LPM_CAP BIT(22)
#define DWC3_DCFG_IGNSTRMPP BIT(23)
/* Device Control Register */
#define DWC3_DCTL_RUN_STOP BIT(31)

11
drivers/usb/dwc3/gadget.c
View File

@ -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);