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

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>

diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
index c5f576a..186a886 100644 (file)
--- a/drivers/usb/dwc3/core.h
+++ b/drivers/usb/dwc3/core.h
@@ -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)

diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index 4b681b0..c3b0d01 100644 (file)
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -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);