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authorWilliam Wu <wulf@rock-chips.com>2016-11-15 06:54:07 +0300
committerKishon Vijay Abraham I <kishon@ti.com>2016-11-18 15:49:15 +0300
commit882e1492c7caac8b2f41c50efc2648ff2cd88b72 (patch)
tree74c95c4f985dba5d8638aa9ec9db192899813e84 /drivers/phy
parentae9fc711d3d0fe62ffeeb83f24e79e08eafd733f (diff)
downloadlinux-882e1492c7caac8b2f41c50efc2648ff2cd88b72.tar.xz
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". 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>
Diffstat (limited to 'drivers/phy')
-rw-r--r--drivers/phy/phy-rockchip-inno-usb2.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/phy/phy-rockchip-inno-usb2.c b/drivers/phy/phy-rockchip-inno-usb2.c
index 486a0e4290b2..eb89de59b68f 100644
--- a/drivers/phy/phy-rockchip-inno-usb2.c
+++ b/drivers/phy/phy-rockchip-inno-usb2.c
@@ -266,8 +266,8 @@ static int rockchip_usb2phy_clk480m_prepare(struct clk_hw *hw)
if (ret)
return ret;
- /* waitting for the clk become stable */
- mdelay(1);
+ /* waiting for the clk become stable */
+ usleep_range(1200, 1300);
}
return 0;