diff mbox

[08/20] phy: rockchip-inno-usb2: correct 480MHz output clock stable time

Message ID 1479475723-4857-9-git-send-email-kishon@ti.com
State Accepted
Commit 882e1492c7caac8b2f41c50efc2648ff2cd88b72
Headers show

Commit Message

Kishon Vijay Abraham I Nov. 18, 2016, 1:28 p.m. UTC 
From: William Wu <wulf@rock-chips.com>


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>

---
 drivers/phy/phy-rockchip-inno-usb2.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

-- 
1.7.9.5
diff mbox

Patch

diff --git a/drivers/phy/phy-rockchip-inno-usb2.c b/drivers/phy/phy-rockchip-inno-usb2.c
index 486a0e4..eb89de5 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;