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Date: Thu, 18 May 2017 11:42:59 +0800 From: Frank Wang <frank.wang@...k-chips.com> To: heiko@...ech.de, kishon@...com, william.wu@...k-chips.com Cc: linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, linux-rockchip@...ts.infradead.org, charles.chen@...k-chips.com, cody.xie@...k-chips.com, kevan.lan@...k-chips.com, huangtao@...k-chips.com, wmc@...k-chips.com, Frank Wang <frank.wang@...k-chips.com> Subject: [PATCH 1/4] phy: rockchip-inno-usb2: add a delay after phy resume From: William Wu <william.wu@...k-chips.com> When resume phy, it need about 1.5 ~ 2ms to wait for utmi_clk which used for USB controller to become stable. Signed-off-by: William Wu <william.wu@...k-chips.com> Signed-off-by: Frank Wang <frank.wang@...k-chips.com> --- drivers/phy/phy-rockchip-inno-usb2.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/phy/phy-rockchip-inno-usb2.c b/drivers/phy/phy-rockchip-inno-usb2.c index 8efe78a..f12dc8d 100644 --- a/drivers/phy/phy-rockchip-inno-usb2.c +++ b/drivers/phy/phy-rockchip-inno-usb2.c @@ -463,6 +463,9 @@ static int rockchip_usb2phy_power_on(struct phy *phy) if (ret) return ret; + /* waiting for the utmi_clk to become stable */ + usleep_range(1500, 2000); + rport->suspended = false; return 0; } -- 2.0.0
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