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authorTakeshi Kihara <takeshi.kihara.df@renesas.com>2014-11-04 02:05:43 +0100
committerFelipe Balbi <balbi@ti.com>2014-11-05 20:22:09 +0100
commit04a5def3df1cea758662615e075f64677690c75f (patch)
tree17807399c602c95dd51344bda14656dcc09401dc
parentusb: renesas_usbhs: gadget: fix NULL pointer dereference in ep_disable() (diff)
downloadlinux-04a5def3df1cea758662615e075f64677690c75f.tar.xz
linux-04a5def3df1cea758662615e075f64677690c75f.zip
usb: renesas_usbhs: gadget: fix the behavior of pullup
This patch fixes an issue that this driver always enable the D+ pullup after it detected the VBUS connection even though this usb controller can control the D+ pullup timing by software. So, this driver should enable the D+ pullup after a gadget driver called usb_gadget_connect(). Signed-off-by: Takeshi Kihara <takeshi.kihara.df@renesas.com> Signed-off-by: Kazuya Mizuguchi <kazuya.mizuguchi.ks@renesas.com> Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> Signed-off-by: Felipe Balbi <balbi@ti.com>
-rw-r--r--drivers/usb/renesas_usbhs/common.c6
-rw-r--r--drivers/usb/renesas_usbhs/mod_gadget.c30
2 files changed, 33 insertions, 3 deletions
diff --git a/drivers/usb/renesas_usbhs/common.c b/drivers/usb/renesas_usbhs/common.c
index 169307ba08b7..371478704899 100644
--- a/drivers/usb/renesas_usbhs/common.c
+++ b/drivers/usb/renesas_usbhs/common.c
@@ -126,13 +126,15 @@ void usbhs_sys_host_ctrl(struct usbhs_priv *priv, int enable)
void usbhs_sys_function_ctrl(struct usbhs_priv *priv, int enable)
{
u16 mask = DCFM | DRPD | DPRPU | HSE | USBE;
- u16 val = DPRPU | HSE | USBE;
+ u16 val = HSE | USBE;
/*
* if enable
*
* - select Function mode
- * - D+ Line Pull-up
+ * - D+ Line Pull-up is disabled
+ * When D+ Line Pull-up is enabled,
+ * calling usbhs_sys_function_pullup(,1)
*/
usbhs_bset(priv, SYSCFG, mask, enable ? val : 0);
}
diff --git a/drivers/usb/renesas_usbhs/mod_gadget.c b/drivers/usb/renesas_usbhs/mod_gadget.c
index ac51b594590d..cb2d529e3a33 100644
--- a/drivers/usb/renesas_usbhs/mod_gadget.c
+++ b/drivers/usb/renesas_usbhs/mod_gadget.c
@@ -56,6 +56,7 @@ struct usbhsg_gpriv {
#define USBHSG_STATUS_REGISTERD (1 << 1)
#define USBHSG_STATUS_WEDGE (1 << 2)
#define USBHSG_STATUS_SELF_POWERED (1 << 3)
+#define USBHSG_STATUS_SOFT_CONNECT (1 << 4)
};
struct usbhsg_recip_handle {
@@ -726,6 +727,25 @@ static struct usb_ep_ops usbhsg_ep_ops = {
};
/*
+ * pullup control
+ */
+static int usbhsg_can_pullup(struct usbhs_priv *priv)
+{
+ struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv);
+
+ return gpriv->driver &&
+ usbhsg_status_has(gpriv, USBHSG_STATUS_SOFT_CONNECT);
+}
+
+static void usbhsg_update_pullup(struct usbhs_priv *priv)
+{
+ if (usbhsg_can_pullup(priv))
+ usbhs_sys_function_pullup(priv, 1);
+ else
+ usbhs_sys_function_pullup(priv, 0);
+}
+
+/*
* usb module start/end
*/
static int usbhsg_try_start(struct usbhs_priv *priv, u32 status)
@@ -775,6 +795,7 @@ static int usbhsg_try_start(struct usbhs_priv *priv, u32 status)
* - usb module
*/
usbhs_sys_function_ctrl(priv, 1);
+ usbhsg_update_pullup(priv);
/*
* enable irq callback
@@ -880,8 +901,15 @@ static int usbhsg_pullup(struct usb_gadget *gadget, int is_on)
{
struct usbhsg_gpriv *gpriv = usbhsg_gadget_to_gpriv(gadget);
struct usbhs_priv *priv = usbhsg_gpriv_to_priv(gpriv);
+ unsigned long flags;
- usbhs_sys_function_pullup(priv, is_on);
+ usbhs_lock(priv, flags);
+ if (is_on)
+ usbhsg_status_set(gpriv, USBHSG_STATUS_SOFT_CONNECT);
+ else
+ usbhsg_status_clr(gpriv, USBHSG_STATUS_SOFT_CONNECT);
+ usbhsg_update_pullup(priv);
+ usbhs_unlock(priv, flags);
return 0;
}