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

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Message-ID: <1479475723-4857-9-git-send-email-kishon@ti.com>
Date:   Fri, 18 Nov 2016 18:58:31 +0530
From:   Kishon Vijay Abraham I <kishon@...com>
To:     <gregkh@...uxfoundation.org>
CC:     <kishon@...com>, <linux-kernel@...r.kernel.org>
Subject: [PATCH 08/20] phy: rockchip-inno-usb2: correct 480MHz output clock stable time

From: William Wu <wulf@...k-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@...k-chips.com>
Reviewed-by: Douglas Anderson <dianders@...omium.org>
Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
---
 drivers/phy/phy-rockchip-inno-usb2.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

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;
-- 
1.7.9.5