target/linux/layerscape/patches-5.4/820-usb-0006-usb-dwc3-drd-add-usb-role-switch-class-support-for-d.patch

   1 From 8595748e58885439c7e18a11a94702378bff3b02 Mon Sep 17 00:00:00 2001
   2 From: Li Jun <jun.li@nxp.com>
   3 Date: Sun, 27 Jan 2019 19:40:03 +0800
   4 Subject: [PATCH] usb: dwc3: drd: add usb role switch class support for dual
   5  role swap
   6
   7 Register a usb_role_switch for dual role swap if the property
   8 "usb-role-switch" is present.
   9
  10 Signed-off-by: Li Jun <jun.li@nxp.com>
  11 ---
  12  drivers/usb/dwc3/core.h |  2 ++
  13  drivers/usb/dwc3/drd.c  | 47 ++++++++++++++++++++++++++++++++++++++++++++++-
  14  2 files changed, 48 insertions(+), 1 deletion(-)
  15
  16 --- a/drivers/usb/dwc3/core.h
  17 +++ b/drivers/usb/dwc3/core.h
  18 @@ -25,6 +25,7 @@
  19  #include <linux/usb/ch9.h>
  20  #include <linux/usb/gadget.h>
  21  #include <linux/usb/otg.h>
  22 +#include <linux/usb/role.h>
  23  #include <linux/ulpi/interface.h>
  24
  25  #include <linux/phy/phy.h>
  26 @@ -1082,6 +1083,7 @@ struct dwc3 {
  27         void __iomem            *regs;
  28         size_t                  regs_size;
  29
  30 +       struct usb_role_switch  *role_switch;
  31         enum usb_dr_mode        dr_mode;
  32         u32                     current_dr_role;
  33         u32                     desired_dr_role;
  34 --- a/drivers/usb/dwc3/drd.c
  35 +++ b/drivers/usb/dwc3/drd.c
  36 @@ -476,6 +476,43 @@ static struct extcon_dev *dwc3_get_extco
  37         return edev;
  38  }
  39
  40 +static int dwc3_usb_role_switch_set(struct device *dev, enum usb_role role)
  41 +{
  42 +       u32 mode;
  43 +
  44 +       switch (role) {
  45 +       case USB_ROLE_HOST:
  46 +               mode = DWC3_GCTL_PRTCAP_HOST;
  47 +               break;
  48 +       case USB_ROLE_DEVICE:
  49 +               mode = DWC3_GCTL_PRTCAP_DEVICE;
  50 +               break;
  51 +       default:
  52 +               return 0;
  53 +       };
  54 +
  55 +       dwc3_set_mode(dev_get_drvdata(dev), mode);
  56 +       return 0;
  57 +}
  58 +
  59 +static enum usb_role dwc3_usb_role_switch_get(struct device *dev)
  60 +{
  61 +       struct dwc3 *dwc = dev_get_drvdata(dev);
  62 +       unsigned long flags;
  63 +       enum usb_role role;
  64 +
  65 +       spin_lock_irqsave(&dwc->lock, flags);
  66 +       role = dwc->current_dr_role;
  67 +       spin_unlock_irqrestore(&dwc->lock, flags);
  68 +
  69 +       return role;
  70 +}
  71 +
  72 +static const struct usb_role_switch_desc dwc3_role_switch = {
  73 +       .set = dwc3_usb_role_switch_set,
  74 +       .get = dwc3_usb_role_switch_get,
  75 +};
  76 +
  77  int dwc3_drd_init(struct dwc3 *dwc)
  78  {
  79         int ret, irq;
  80 @@ -484,7 +521,12 @@ int dwc3_drd_init(struct dwc3 *dwc)
  81         if (IS_ERR(dwc->edev))
  82                 return PTR_ERR(dwc->edev);
  83
  84 -       if (dwc->edev) {
  85 +       if (device_property_read_bool(dwc->dev, "usb-role-switch")) {
  86 +               dwc->role_switch = usb_role_switch_register(dwc->dev,
  87 +                                                           &dwc3_role_switch);
  88 +               if (IS_ERR(dwc->role_switch))
  89 +                       return PTR_ERR(dwc->role_switch);
  90 +       } else if (dwc->edev) {
  91                 dwc->edev_nb.notifier_call = dwc3_drd_notifier;
  92                 ret = extcon_register_notifier(dwc->edev, EXTCON_USB_HOST,
  93                                                &dwc->edev_nb);
  94 @@ -531,6 +573,9 @@ void dwc3_drd_exit(struct dwc3 *dwc)
  95  {
  96         unsigned long flags;
  97
  98 +       if (dwc->role_switch)
  99 +               usb_role_switch_unregister(dwc->role_switch);
 100 +
 101         if (dwc->edev)
 102                 extcon_unregister_notifier(dwc->edev, EXTCON_USB_HOST,
 103                                            &dwc->edev_nb);