diff options
| -rw-r--r-- | drivers/usb/otg/mxs-phy.c | 38 |
1 files changed, 35 insertions, 3 deletions
diff --git a/drivers/usb/otg/mxs-phy.c b/drivers/usb/otg/mxs-phy.c index c1a67cb8e24..88db976647c 100644 --- a/drivers/usb/otg/mxs-phy.c +++ b/drivers/usb/otg/mxs-phy.c @@ -20,6 +20,7 @@ #include <linux/delay.h> #include <linux/err.h> #include <linux/io.h> +#include <linux/workqueue.h> #define DRIVER_NAME "mxs_phy" @@ -34,9 +35,16 @@ #define BM_USBPHY_CTRL_ENUTMILEVEL2 BIT(14) #define BM_USBPHY_CTRL_ENHOSTDISCONDETECT BIT(1) +/* + * Amount of delay in miliseconds to safely enable ENHOSTDISCONDETECT bit + * so that connection and reset processing can be completed for the root hub. + */ +#define MXY_PHY_ENHOSTDISCONDETECT_DELAY 250 + struct mxs_phy { struct usb_phy phy; struct clk *clk; + struct delayed_work enhostdiscondetect_work; }; #define to_mxs_phy(p) container_of((p), struct mxs_phy, phy) @@ -62,6 +70,7 @@ static int mxs_phy_init(struct usb_phy *phy) clk_prepare_enable(mxs_phy->clk); mxs_phy_hw_init(mxs_phy); + INIT_DELAYED_WORK(&mxs_phy->enhostdiscondetect_work, NULL); return 0; } @@ -76,13 +85,34 @@ static void mxs_phy_shutdown(struct usb_phy *phy) clk_disable_unprepare(mxs_phy->clk); } +static void mxs_phy_enhostdiscondetect_delay(struct work_struct *ws) +{ + struct mxs_phy *mxs_phy = container_of(ws, struct mxs_phy, + enhostdiscondetect_work.work); + + /* Enable HOSTDISCONDETECT after delay. */ + dev_dbg(mxs_phy->phy.dev, "Setting ENHOSTDISCONDETECT\n"); + writel_relaxed(BM_USBPHY_CTRL_ENHOSTDISCONDETECT, + mxs_phy->phy.io_priv + HW_USBPHY_CTRL_SET); +} + static int mxs_phy_on_connect(struct usb_phy *phy, int port) { + struct mxs_phy *mxs_phy = to_mxs_phy(phy); + dev_dbg(phy->dev, "Connect on port %d\n", port); - mxs_phy_hw_init(to_mxs_phy(phy)); - writel_relaxed(BM_USBPHY_CTRL_ENHOSTDISCONDETECT, - phy->io_priv + HW_USBPHY_CTRL_SET); + mxs_phy_hw_init(mxs_phy); + + /* + * Delay enabling ENHOSTDISCONDETECT so that connection and + * reset processing can be completed for the root hub. + */ + dev_dbg(phy->dev, "Delaying setting ENHOSTDISCONDETECT\n"); + PREPARE_DELAYED_WORK(&mxs_phy->enhostdiscondetect_work, + mxs_phy_enhostdiscondetect_delay); + schedule_delayed_work(&mxs_phy->enhostdiscondetect_work, + msecs_to_jiffies(MXY_PHY_ENHOSTDISCONDETECT_DELAY)); return 0; } @@ -91,6 +121,8 @@ static int mxs_phy_on_disconnect(struct usb_phy *phy, int port) { dev_dbg(phy->dev, "Disconnect on port %d\n", port); + /* No need to delay before clearing ENHOSTDISCONDETECT. */ + dev_dbg(phy->dev, "Clearing ENHOSTDISCONDETECT\n"); writel_relaxed(BM_USBPHY_CTRL_ENHOSTDISCONDETECT, phy->io_priv + HW_USBPHY_CTRL_CLR); |