Hello.
On 12/09/2013 09:31 AM, Peter Chen wrote:
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 e18fdf3..7ae5225 100644
--- a/drivers/usb/phy/phy-mxs-usb.c
+++ b/drivers/usb/phy/phy-mxs-usb.c
@@ -151,6 +151,15 @@ 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);
+}
+
Don't think this is a good name for this function since it doesn't really
switch anything, just waits. I'd suggest something like
mxs_phy_clock_switch_delay().
WBR, Sergei
--
To unsubscribe from this list: send the line "unsubscribe linux-usb" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
