usb: renesas_usbhs: add support for CNEN bit

For some SoC, CNEN must be set for USB Device mode operation.

Signed-off-by: Chris Brandt <chris.brandt@renesas.com>
Reviewed-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Reviewed-by: Simon Horman <horms+renesas@verge.net.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/renesas_usbhs/common.c b/drivers/usb/renesas_usbhs/common.c
index 1de7a44..734fb4e 100644 (file)
--- a/drivers/usb/renesas_usbhs/common.c
+++ b/drivers/usb/renesas_usbhs/common.c
@@ -114,6 +114,12 @@ void usbhs_sys_function_ctrl(struct usbhs_priv *priv, int enable)
        u16 mask = DCFM | DRPD | DPRPU | HSE | USBE;
        u16 val  = HSE | USBE;
 
+       /* CNEN bit is required for function operation */
+       if (usbhs_get_dparam(priv, has_cnen)) {
+               mask |= CNEN;
+               val  |= CNEN;
+       }
+
        /*
         * if enable
         *

diff --git a/drivers/usb/renesas_usbhs/common.h b/drivers/usb/renesas_usbhs/common.h
index 1fbffb7..de74ebd 100644 (file)
--- a/drivers/usb/renesas_usbhs/common.h
+++ b/drivers/usb/renesas_usbhs/common.h
@@ -104,6 +104,7 @@ struct usbhs_priv;
 
 /* SYSCFG */
 #define SCKE   (1 << 10)       /* USB Module Clock Enable */
+#define CNEN   (1 << 8)        /* Single-ended receiver operation Enable */
 #define HSE    (1 << 7)        /* High-Speed Operation Enable */
 #define DCFM   (1 << 6)        /* Controller Function Select */
 #define DRPD   (1 << 5)        /* D+ Line/D- Line Resistance Control */

diff --git a/include/linux/usb/renesas_usbhs.h b/include/linux/usb/renesas_usbhs.h
index 17fae6e..9097a38 100644 (file)
--- a/include/linux/usb/renesas_usbhs.h
+++ b/include/linux/usb/renesas_usbhs.h
@@ -190,6 +190,7 @@ struct renesas_usbhs_driver_param {
        u32 has_sudmac:1; /* for SUDMAC */
        u32 has_usb_dmac:1; /* for USB-DMAC */
        u32 runtime_pwctrl:1;
+       u32 has_cnen:1;
 #define USBHS_USB_DMAC_XFER_SIZE       32      /* hardcode the xfer size */
 };