phy: rockchip-inno-usb2: correct 480MHz output clock stable time

We found that the system crashed due to 480MHz output clock of
USB2 PHY was unstable after clock had been enabled by gpu module.

Theoretically, 1 millisecond is a critical value for 480MHz
output clock stable time, so we try to change the delay time
to 1.2 millisecond to avoid this issue.

And the commit ed907fb1d7c3 ("phy: rockchip-inno-usb2: correct
clk_ops callback") used prepare callbacks instead of enable
callbacks to support gate a clk if the operation may sleep. So
we can switch from delay to sleep functions.

Also fix a spelling error from "waitting" to "waiting".

Change-Id: Ie9883e5e9a3f0c2edec9d259b844ca536348c9cf
Signed-off-by: William Wu <wulf@rock-chips.com>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>

diff --git a/drivers/phy/phy-rockchip-inno-usb2.c b/drivers/phy/phy-rockchip-inno-usb2.c
index 1f1846db4994513b334e2413223c75d2e29194eb..27199c3a34b1fdef5197449685364847e9548749 100644 (file)
--- a/drivers/phy/phy-rockchip-inno-usb2.c
+++ b/drivers/phy/phy-rockchip-inno-usb2.c
@@ -298,8 +298,8 @@ static int rockchip_usb2phy_clk480m_prepare(struct clk_hw *hw)
                if (ret)
                        return ret;
 
-               /* waitting for the clk become stable */
-               udelay(1200);
+               /* waiting for the clk become stable */
+               usleep_range(1200, 1300);
        }
 
        return 0;