target/linux/brcm2708/patches-3.10/0095-dwc_otg-Don-t-issue-traffic-to-LS-devices-in-FS-mode.patch

   1 From 503ed51d257784037165695334e7a3d03d85d674 Mon Sep 17 00:00:00 2001
   2 From: P33M <P33M@github.com>
   3 Date: Fri, 27 Sep 2013 14:42:24 +0100
   4 Subject: [PATCH 095/196] dwc_otg: Don't issue traffic to LS devices in FS mode
   5
   6 Issuing low-speed packets when the root port is in full-speed mode
   7 causes the root port to stop responding. Explicitly fail when
   8 enqueuing URBs to a LS endpoint on a FS bus.
   9 ---
  10  drivers/usb/host/dwc_otg/dwc_otg_hcd.c | 11 +++++++++++
  11  1 file changed, 11 insertions(+)
  12
  13 diff --git a/drivers/usb/host/dwc_otg/dwc_otg_hcd.c b/drivers/usb/host/dwc_otg/dwc_otg_hcd.c
  14 index be1d25b..b3e1944 100644
  15 --- a/drivers/usb/host/dwc_otg/dwc_otg_hcd.c
  16 +++ b/drivers/usb/host/dwc_otg/dwc_otg_hcd.c
  17 @@ -501,6 +501,7 @@ int dwc_otg_hcd_urb_enqueue(dwc_otg_hcd_t * hcd,
  18         dwc_otg_transaction_type_e tr_type;
  19         dwc_otg_qtd_t *qtd;
  20         gintmsk_data_t intr_mask = {.d32 = 0 };
  21 +       hprt0_data_t hprt0 = { .d32 = 0 };
  22
  23  #ifdef DEBUG /* integrity checks (Broadcom) */
  24         if (NULL == hcd->core_if) {
  25 @@ -515,6 +516,16 @@ int dwc_otg_hcd_urb_enqueue(dwc_otg_hcd_t * hcd,
  26                 return -DWC_E_NO_DEVICE;
  27         }
  28
  29 +       /* Some core configurations cannot support LS traffic on a FS root port */
  30 +       if ((hcd->fops->speed(hcd, dwc_otg_urb->priv) == USB_SPEED_LOW) &&
  31 +               (hcd->core_if->hwcfg2.b.fs_phy_type == 1) &&
  32 +               (hcd->core_if->hwcfg2.b.hs_phy_type == 1)) {
  33 +                       hprt0.d32 = DWC_READ_REG32(hcd->core_if->host_if->hprt0);
  34 +                       if (hprt0.b.prtspd == DWC_HPRT0_PRTSPD_FULL_SPEED) {
  35 +                               return -DWC_E_NO_DEVICE;
  36 +                       }
  37 +       }
  38 +
  39         qtd = dwc_otg_hcd_qtd_create(dwc_otg_urb, atomic_alloc);
  40         if (qtd == NULL) {
  41                 DWC_ERROR("DWC OTG HCD URB Enqueue failed creating QTD\n");
  42 --
  43 1.9.1
  44