Merge tag 'v4.14-rc6' into locking/core, to pick up fixes

Signed-off-by: Ingo Molnar <mingo@kernel.org>

1 files changed, 17 insertions, 0 deletions

diff --git a/drivers/usb/phy/phy-tegra-usb.c b/drivers/usb/phy/phy-tegra-usb.c
index 5fe4a5704bde..ccc2bf5274b4 100644
--- a/drivers/usb/phy/phy-tegra-usb.c
+++ b/drivers/usb/phy/phy-tegra-usb.c
@@ -329,6 +329,14 @@ static void utmi_phy_clk_disable(struct tegra_usb_phy *phy)
 	unsigned long val;
 	void __iomem *base = phy->regs;
 
+	/*
+	 * The USB driver may have already initiated the phy clock
+	 * disable so wait to see if the clock turns off and if not
+	 * then proceed with gating the clock.
+	 */
+	if (utmi_wait_register(base + USB_SUSP_CTRL, USB_PHY_CLK_VALID, 0) == 0)
+		return;
+
 	if (phy->is_legacy_phy) {
 		val = readl(base + USB_SUSP_CTRL);
 		val |= USB_SUSP_SET;
@@ -351,6 +359,15 @@ static void utmi_phy_clk_enable(struct tegra_usb_phy *phy)
 	unsigned long val;
 	void __iomem *base = phy->regs;
 
+	/*
+	 * The USB driver may have already initiated the phy clock
+	 * enable so wait to see if the clock turns on and if not
+	 * then proceed with ungating the clock.
+	 */
+	if (utmi_wait_register(base + USB_SUSP_CTRL, USB_PHY_CLK_VALID,
+			       USB_PHY_CLK_VALID) == 0)
+		return;
+
 	if (phy->is_legacy_phy) {
 		val = readl(base + USB_SUSP_CTRL);
 		val |= USB_SUSP_CLR;