Tentative USB dwc2 patch

root@f1b58cf9c773:/srv/tools-rf/armbian# cat patch-usb.patch
--- drivers/usb/dwc2/hcd.c.orig 2018-04-09 03:19:20.669368382 +0000
+++ drivers/usb/dwc2/hcd.c  2018-04-16 15:01:25.740983779 +0000
@@ -316,6 +316,8 @@

    usbcfg = dwc2_readl(hsotg->regs + GUSBCFG);
    usbcfg &= ~(GUSBCFG_HNPCAP | GUSBCFG_SRPCAP);
+   /* Set HS/FS Timeout Calibration */
+   usbcfg |= GUSBCFG_TOUTCAL(7);

    switch (hsotg->hw_params.op_mode) {
    case GHWCFG2_OP_MODE_HNP_SRP_CAPABLE:
@@ -2186,12 +2188,17 @@
  */
 static int dwc2_core_init(struct dwc2_hsotg *hsotg, bool initial_setup)
 {
-   u32 usbcfg, otgctl;
+   u32 usbcfg, otgctl; trdtrim;
    int retval;

    dev_dbg(hsotg->dev, "%s(%p)\n", __func__, hsotg);

+   /* Set USBTrdTim value */
    usbcfg = dwc2_readl(hsotg->regs + GUSBCFG);
+   usbcfg &= ~GUSBCFG_USBTRDTIM_MASK;
+   trdtrim = (hsotg->phyif == GUSBCFG_PHYIF8) ? 9 : 5;
+   usbcfg |= (trdtrim << GUSBCFG_USBTRDTIM_SHIFT);
+   dwc2_writel(usbcfg, hsotg->regs + GUSBCFG);

    /* Set ULPI External VBUS bit if needed */
    usbcfg &= ~GUSBCFG_ULPI_EXT_VBUS_DRV;