phy: tegra: xusb: Disable trk clk when not in use

Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2122414
Upstream Status: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
Tested: Verify USB-A and USB-C are functional on Nvidia Orin board,
 and no regressions on other platforms.

commit e5f9124
Author: Wayne Chang <waynec@nvidia.com>
Date:   Wed Jan 11 11:04:48 2023 +0000

    phy: tegra: xusb: Disable trk clk when not in use

    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: Vinod Koul <vkoul@kernel.org>
    (cherry picked from commit e5f9124)

Signed-off-by: David Marlin <dmarlin@redhat.com>

Author: damarlin

drivers/phy/tegra/xusb-tegra186.c

@@ -609,6 +609,10 @@ 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);
 }
 
@@ -633,8 +637,6 @@ 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);
 }