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usb: dwc3: gadget: disable automatic calculation of ACK TP NUMP

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Now that we calculate DCFG.NUMP, we can disable
dwc3's automatic calculation so we maximize our
chances of very high throughtput through the use of
bursts.

Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
This commit is contained in:
Felipe Balbi 2016-04-28 10:56:28 +03:00
parent 676e349744
commit 2a58f9c12b
2 changed files with 16 additions and 0 deletions
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5
drivers/usb/dwc3/core.h
View File

@ -165,6 +165,11 @@
#define DWC3_DESCFETCHQ 13
#define DWC3_EVENTQ 15
/* Global RX Threshold Configuration Register */
#define DWC3_GRXTHRCFG_MAXRXBURSTSIZE(n) (((n) & 0x1f) << 19)
#define DWC3_GRXTHRCFG_RXPKTCNT(n) (((n) & 0xf) << 24)
#define DWC3_GRXTHRCFG_PKTCNTSEL (1 << 29)
/* Global Configuration Register */
#define DWC3_GCTL_PWRDNSCALE(n) ((n) << 19)
#define DWC3_GCTL_U2RSTECN (1 << 16)

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

@ -1669,6 +1669,17 @@ static int dwc3_gadget_start(struct usb_gadget *g,
}
dwc3_writel(dwc->regs, DWC3_DCFG, reg);
/*
* We are telling dwc3 that we want to use DCFG.NUMP as ACK TP's NUMP
* field instead of letting dwc3 itself calculate that automatically.
*
* This way, we maximize the chances that we'll be able to get several
* bursts of data without going through any sort of endpoint throttling.
*/
reg = dwc3_readl(dwc->regs, DWC3_GRXTHRCFG);
reg &= ~DWC3_GRXTHRCFG_PKTCNTSEL;
dwc3_writel(dwc->regs, DWC3_GRXTHRCFG, reg);
/* Start with SuperSpeed Default */
dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(512);