phy: rockchip: usbdp: Fix Generic PHY reference counting

Generic PHY reference counting helps ensure driver ops for init/exit and
power on/off are called at correct state. For this to work the PHY
driver must initialize PHY-id to a persistent value in of_xlate ops.

The Rockchip USBDP PHY driver does not initialize the PHY-id field, this
typically lead to use of unshared reference counting among different
struct phy instances.

Initialize the PHY-id in of_xlate ops to ensure use of shared reference
counting among all struct phy instances.

E.g. on a ROCK 5B following could be observed:

  => usb start
  starting USB...
  [...]
  Bus usb@fc400000: 2 USB Device(s) found
         scanning usb for storage devices... 1 Storage Device(s) found

  => usb reset
  resetting USB...
  [...]
  rockchip_udphy phy@fed90000: cmn ana lcpll lock timeout
  rockchip_udphy phy@fed90000: failed to init usbdp combophy
  rockchip_udphy phy@fed90000: PHY: Failed to init phy@fed90000: -110.
  Can't init PHY1
  Bus usb@fc400000: probe failed, error -110
         scanning usb for storage devices... 0 Storage Device(s) found

With shared reference counting this is fixed:

  => usb reset
  resetting USB...
  [...]
  Bus usb@fc400000: 2 USB Device(s) found
         scanning usb for storage devices... 1 Storage Device(s) found

Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>

diff --git a/drivers/phy/rockchip/phy-rockchip-usbdp.c b/drivers/phy/rockchip/phy-rockchip-usbdp.c
index ed04418..c88eb0c 100644 (file)
--- a/drivers/phy/rockchip/phy-rockchip-usbdp.c
+++ b/drivers/phy/rockchip/phy-rockchip-usbdp.c
@@ -587,12 +587,16 @@ static int udphy_power_off(struct rockchip_udphy *udphy, u8 mode)
 static int rockchip_u3phy_of_xlate(struct phy *phy,
                                   struct ofnode_phandle_args *args)
 {
+       struct rockchip_udphy *udphy = dev_get_priv(phy->dev);
+
        if (args->args_count == 0)
                return -EINVAL;
 
        if (args->args[0] != PHY_TYPE_USB3)
                return -EINVAL;
 
+       phy->id = udphy->id;
+
        return 0;
 }