usb: phy: tegra: Clean up ulpi_phy_power_off

Firstly, the PHY's clock needs to unprepared to keep prepare count
balanced. Secondly, downstream code suggests that reset is synchronous
and thus it should be asserted before disabling clock.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Link: https://lore.kernel.org/r/20200106013416.9604-4-digetx@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/phy/phy-tegra-usb.c

@@ -757,8 +757,19 @@ static int ulpi_phy_power_on(struct tegra_usb_phy *phy)
 
 static int ulpi_phy_power_off(struct tegra_usb_phy *phy)
 {
-	clk_disable(phy->clk);
+	int err;
-	return gpio_direction_output(phy->reset_gpio, 0);
+
+	err = gpio_direction_output(phy->reset_gpio, 0);
+	if (err) {
+		dev_err(phy->u_phy.dev, "reset GPIO not asserted: %d\n", err);
+		return err;
+	}
+
+	usleep_range(5000, 6000);
+
+	clk_disable_unprepare(phy->clk);
+
+	return 0;
 }
 
 static void tegra_usb_phy_close(struct tegra_usb_phy *phy)