After clear portsc.phcd, PHY needs 200us stable time for switch
32K clock to AHB clock.
Signed-off-by: Peter Chen <peter.chen@xxxxxxxxxxxxx>
---
drivers/usb/phy/phy-mxs-usb.c | 11 +++++++++++
1 files changed, 11 insertions(+), 0 deletions(-)
diff --git a/drivers/usb/phy/phy-mxs-usb.c b/drivers/usb/phy/phy-mxs-usb.c
index 3e25c3d..52e80d9 100644
--- a/drivers/usb/phy/phy-mxs-usb.c
+++ b/drivers/usb/phy/phy-mxs-usb.c
@@ -139,6 +139,15 @@ static inline bool is_imx6sl_phy(struct mxs_phy *mxs_phy)
return mxs_phy->data == &imx6sl_phy_data;
}
+/*
+ * PHY needs some 32K cycles to switch from 32K clock to
+ * bus (such as AHB/AXI, etc) clock.
+ */
+static void mxs_phy_clock_switch(void)
+{
+ usleep_range(300, 400);
+}
+
static int mxs_phy_hw_init(struct mxs_phy *mxs_phy)
{
int ret;
@@ -234,6 +243,7 @@ static int mxs_phy_init(struct usb_phy *phy)
{
struct mxs_phy *mxs_phy = to_mxs_phy(phy);
+ mxs_phy_clock_switch();
clk_prepare_enable(mxs_phy->clk);
return mxs_phy_hw_init(mxs_phy);
}
@@ -258,6 +268,7 @@ static int mxs_phy_suspend(struct usb_phy *x, int suspend)
x->io_priv + HW_USBPHY_CTRL_SET);
clk_disable_unprepare(mxs_phy->clk);
} else {
+ mxs_phy_clock_switch();
clk_prepare_enable(mxs_phy->clk);
writel(BM_USBPHY_CTRL_CLKGATE,
x->io_priv + HW_USBPHY_CTRL_CLR);
--
1.7.8
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