target/linux/bcm4908/patches-5.4/084-v5.6-0010-phy-usb-PHY-s-MDIO-registers-not-accessible-without-.patch

   1 From fc430aea02068150d053ef24bc424db3dd1357d4 Mon Sep 17 00:00:00 2001
   2 From: Al Cooper <alcooperx@gmail.com>
   3 Date: Fri, 3 Jan 2020 13:18:08 -0500
   4 Subject: [PATCH] phy: usb: PHY's MDIO registers not accessible without device
   5  installed
   6
   7 When there is no device connected and FSM is enabled, the XHCI puts
   8 the PHY into suspend mode.  When the PHY is put into suspend mode
   9 the USB LDO powers down the PHY. This causes the MDIO to be
  10 inaccessible and its registers reset to default. The fix is to
  11 disable FSM.
  12
  13 Signed-off-by: Al Cooper <alcooperx@gmail.com>
  14 Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
  15 Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
  16 ---
  17  drivers/phy/broadcom/phy-brcm-usb-init-synopsys.c | 9 +++++++++
  18  1 file changed, 9 insertions(+)
  19
  20 --- a/drivers/phy/broadcom/phy-brcm-usb-init-synopsys.c
  21 +++ b/drivers/phy/broadcom/phy-brcm-usb-init-synopsys.c
  22 @@ -56,6 +56,7 @@
  23  #define USB_PHY_PLL_LDO_CTL            0x08
  24  #define   USB_PHY_PLL_LDO_CTL_AFE_CORERDY_MASK         0x00000004
  25  #define USB_PHY_UTMI_CTL_1             0x04
  26 +#define   USB_PHY_UTMI_CTL_1_POWER_UP_FSM_EN_MASK      0x00000800
  27  #define   USB_PHY_UTMI_CTL_1_PHY_MODE_MASK             0x0000000c
  28  #define   USB_PHY_UTMI_CTL_1_PHY_MODE_SHIFT            2
  29  #define USB_PHY_STATUS                 0x20
  30 @@ -229,6 +230,14 @@ static void usb_init_common_7211b0(struc
  31
  32         usb_init_common(params);
  33
  34 +       /*
  35 +        * Disable FSM, otherwise the PHY will auto suspend when no
  36 +        * device is connected and will be reset on resume.
  37 +        */
  38 +       reg = brcm_usb_readl(usb_phy + USB_PHY_UTMI_CTL_1);
  39 +       reg &= ~USB_PHY_UTMI_CTL_1_POWER_UP_FSM_EN_MASK;
  40 +       brcm_usb_writel(reg, usb_phy + USB_PHY_UTMI_CTL_1);
  41 +
  42         usb2_eye_fix_7211b0(params);
  43  }
  44