[PATCH 05/12] usb: phy-mxs: Add implementation of nofity_suspend and notify_resume

[Peter Chen]

Add notify_suspend and notify_resume according to different SoCs.

Signed-off-by: Peter Chen <peter.chen at freescale.com>
---
 drivers/usb/phy/phy-mxs-usb.c |   73 +++++++++++++++++++++++++++++++++++++++++
 1 files changed, 73 insertions(+), 0 deletions(-)

diff --git a/drivers/usb/phy/phy-mxs-usb.c b/drivers/usb/phy/phy-mxs-usb.c
index e0b0de0..8661dae 100644
--- a/drivers/usb/phy/phy-mxs-usb.c
+++ b/drivers/usb/phy/phy-mxs-usb.c
@@ -197,6 +197,78 @@ static int mxs_phy_on_disconnect(struct usb_phy *phy,
 	return 0;
 }
 
+static int mxs_phy_on_suspend_workaround(struct usb_phy *phy,
+		enum usb_device_speed speed)
+{
+	dev_dbg(phy->dev, "%s speed device has suspended\n",
+		(speed == USB_SPEED_HIGH) ? "high" : "non-high");
+
+	/* delay 4ms to wait bus entering idle */
+	usleep_range(4000, 5000);
+
+	/*
+	 * Workaround for wakeup signal between portsc.suspendM
+	 * and PHY enters low power mode.
+	 */
+	writel_relaxed(0xffffffff, phy->io_priv + HW_USBPHY_PWD);
+	writel_relaxed(0, phy->io_priv + HW_USBPHY_PWD);
+
+	if (speed == USB_SPEED_HIGH)
+		writel_relaxed(BM_USBPHY_CTRL_ENHOSTDISCONDETECT,
+				phy->io_priv + HW_USBPHY_CTRL_CLR);
+
+	return 0;
+}
+
+static int mxs_phy_on_suspend(struct usb_phy *phy,
+		enum usb_device_speed speed)
+{
+	dev_dbg(phy->dev, "%s speed device has suspended\n",
+		(speed == USB_SPEED_HIGH) ? "high" : "non-high");
+
+	if (speed == USB_SPEED_HIGH)
+		writel_relaxed(BM_USBPHY_CTRL_ENHOSTDISCONDETECT,
+				phy->io_priv + HW_USBPHY_CTRL_CLR);
+
+	return 0;
+}
+
+/*
+ * The resume signal must be finished here.
+ */
+static int mxs_phy_on_resume(struct usb_phy *phy,
+		enum usb_device_speed speed)
+{
+	dev_dbg(phy->dev, "%s speed device has resumed\n",
+		(speed == USB_SPEED_HIGH) ? "high" : "non-high");
+
+	if (speed == USB_SPEED_HIGH) {
+		/* Make sure the device has switched to High-Speed mode */
+		udelay(500);
+		writel_relaxed(BM_USBPHY_CTRL_ENHOSTDISCONDETECT,
+				phy->io_priv + HW_USBPHY_CTRL_SET);
+	}
+
+	return 0;
+}
+
+/*
+ * For mxs PHY, there are two PHY issues related to suspend/resume.
+ * For mx23 and mx28, both of two issues are existed.
+ * For mx6q and mx6dl, only one issue is existed.
+ * For mx6 sololite, none issue is existed.
+ */
+static void mxs_phy_workaround(struct mxs_phy *mxs_phy)
+{
+	if (is_mx23_phy(mxs_phy)) {
+		mxs_phy->phy.notify_suspend = mxs_phy_on_suspend_workaround;
+		mxs_phy->phy.notify_resume = mxs_phy_on_resume;
+	} else if (is_mx6q_phy(mxs_phy)) {
+		mxs_phy->phy.notify_suspend = mxs_phy_on_suspend;
+		mxs_phy->phy.notify_resume = mxs_phy_on_resume;
+	}
+}
+
 static int mxs_phy_probe(struct platform_device *pdev)
 {
 	struct resource *res;
@@ -257,6 +329,7 @@ static int mxs_phy_probe(struct platform_device *pdev)
 
 	mxs_phy->clk = clk;
 	mxs_phy->devtype = pdev->id_entry->driver_data;
+	mxs_phy_workaround(mxs_phy);
 
 	platform_set_drvdata(pdev, &mxs_phy->phy);
 
-- 
1.7.1