[PATCH 5.15.y 1/2] phy: tegra: xusb: Disable trk clk when not in use

[Sasha Levin <sashal@kernel.org>]

From: Wayne Chang <waynec@nvidia.com>

[ Upstream commit 71d9e899584e11bbd7eaf9934a619c69a15060d8 ]

Pad tracking is a one-time calibration for Tegra186 and Tegra194.
Clk should be disabled after calibration.

Disable clk after calibration.
While at it add 100us delay for HW recording the calibration value.

Signed-off-by: Wayne Chang <waynec@nvidia.com>
Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
Link: https://lore.kernel.org/r/20230111110450.24617-5-jonathanh@nvidia.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Stable-dep-of: da110228b54f ("phy: tegra: xusb: Fix per-pad high-speed termination calibration")
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/phy/tegra/xusb-tegra186.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/phy/tegra/xusb-tegra186.c b/drivers/phy/tegra/xusb-tegra186.c
index e1c8ce06bf5a0..559224f9d0cd9 100644
--- a/drivers/phy/tegra/xusb-tegra186.c
+++ b/drivers/phy/tegra/xusb-tegra186.c
@@ -612,6 +612,10 @@ static void tegra186_utmi_bias_pad_power_on(struct tegra_xusb_padctl *padctl)
 	value &= ~USB2_PD_TRK;
 	padctl_writel(padctl, value, XUSB_PADCTL_USB2_BIAS_PAD_CTL1);
 
+	udelay(100);
+
+	clk_disable_unprepare(priv->usb2_trk_clk);
+
 	mutex_unlock(&padctl->lock);
 }
 
@@ -636,8 +640,6 @@ static void tegra186_utmi_bias_pad_power_off(struct tegra_xusb_padctl *padctl)
 	value |= USB2_PD_TRK;
 	padctl_writel(padctl, value, XUSB_PADCTL_USB2_BIAS_PAD_CTL1);
 
-	clk_disable_unprepare(priv->usb2_trk_clk);
-
 	mutex_unlock(&padctl->lock);
 }
 
-- 
2.53.0