diff options
| author | Thinh Nguyen <[email protected]> | 2021-04-12 20:00:45 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <[email protected]> | 2021-04-14 15:57:44 +0200 |
| commit | e66bbfb0fbbe53ce0144b6715fa0c4c27e3784ae (patch) | |
| tree | bde26f81cf9c874aee323e87fe87aa5a64cb3866 | |
| parent | 8f23fe35ff1e5491b4d279323a8209a31f03ae65 (diff) | |
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 <[email protected]>
Signed-off-by: Thinh Nguyen <[email protected]>
Link: https://lore.kernel.org/r/097ba9e104c143f7ba0195ebff29390ec3043692.1618282705.git.Thinh.Nguyen@synopsys.com
Signed-off-by: Greg Kroah-Hartman <[email protected]>
| -rw-r--r-- | drivers/usb/dwc3/core.h | 1 | ||||
| -rw-r--r-- | drivers/usb/dwc3/gadget.c | 11 |
2 files changed, 12 insertions, 0 deletions
diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h index 6e9abfbccaa6..5a9b56b744c5 100644 --- a/drivers/usb/dwc3/core.h +++ b/drivers/usb/dwc3/core.h @@ -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) 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); |