[PATCH v2 2/6] usb: phy: Workaround for USB erratum-A005728

[Yinbo Zhu <yinbo.zhu@xxxxxxx>]

From: Suresh Gupta <B42813@xxxxxxxxxxxxx>

PHY_CLK_VALID bit for UTMI PHY in USBDR does not set even
if PHY is providing valid clock. Workaround for this
involves resetting of PHY and check PHY_CLK_VALID bit
multiple times. If PHY_CLK_VALID bit is still not set even
after 5 retries, it would be safe to deaclare that PHY
clock is not available.
This erratum is applicable for USBDR less then ver 2.4.

Signed-off-by: Suresh Gupta <B42813@xxxxxxxxxxxxx>
Signed-off-by: Yinbo Zhu <yinbo.zhu@xxxxxxx>
---
Change in v2:
		replace Yinbo.Zhu with Yinbo Zhu

 drivers/usb/host/ehci-fsl.c |   37 ++++++++++++++++++++++++++-----------
 drivers/usb/host/ehci-fsl.h |    3 +++
 2 files changed, 29 insertions(+), 11 deletions(-)

diff --git a/drivers/usb/host/ehci-fsl.c b/drivers/usb/host/ehci-fsl.c
index 71c4661..a28ec1e 100644
--- a/drivers/usb/host/ehci-fsl.c
+++ b/drivers/usb/host/ehci-fsl.c
@@ -176,6 +176,17 @@ static int fsl_ehci_drv_probe(struct platform_device *pdev)
 	return retval;
 }
 
+static bool usb_phy_clk_valid(struct usb_hcd *hcd)
+{
+	void __iomem *non_ehci = hcd->regs;
+	bool ret = true;
+
+	if (!(in_be32(non_ehci + FSL_SOC_USB_CTRL) & PHY_CLK_VALID))
+		ret = false;
+
+	return ret;
+}
+
 static int ehci_fsl_setup_phy(struct usb_hcd *hcd,
 			       enum fsl_usb2_phy_modes phy_mode,
 			       unsigned int port_offset)
@@ -214,6 +225,16 @@ static int ehci_fsl_setup_phy(struct usb_hcd *hcd,
 		/* fall through */
 	case FSL_USB2_PHY_UTMI:
 	case FSL_USB2_PHY_UTMI_DUAL:
+		/* PHY_CLK_VALID bit is de-featured from all controller
+		 * versions below 2.4 and is to be checked only for
+		 * internal UTMI phy
+		 */
+		if (pdata->controller_ver > FSL_USB_VER_2_4 &&
+			pdata->have_sysif_regs && !usb_phy_clk_valid(hcd)) {
+			pr_err("fsl-ehci: USB PHY clock invalid\n");
+			return -EINVAL;
+		}
+
 		if (pdata->have_sysif_regs && pdata->controller_ver) {
 			/* controller version 1.6 or above */
 			clrsetbits_be32(non_ehci + FSL_SOC_USB_CTRL,
@@ -232,17 +253,11 @@ static int ehci_fsl_setup_phy(struct usb_hcd *hcd,
 		break;
 	}
 
-	/*
-	 * check PHY_CLK_VALID to determine phy clock presence before writing
-	 * to portsc
-	 */
-	if (pdata->check_phy_clk_valid) {
-		if (!(ioread32be(non_ehci + FSL_SOC_USB_CTRL) &
-		    PHY_CLK_VALID)) {
-			dev_warn(hcd->self.controller,
-				 "USB PHY clock invalid\n");
-			return -EINVAL;
-		}
+	if (pdata->have_sysif_regs &&
+		pdata->controller_ver > FSL_USB_VER_1_6 &&
+		!usb_phy_clk_valid(hcd)) {
+		dev_warn(hcd->self.controller, "USB PHY clock invalid\n");
+		return -EINVAL;
 	}
 
 	ehci_writel(ehci, portsc, &ehci->regs->port_status[port_offset]);
diff --git a/drivers/usb/host/ehci-fsl.h b/drivers/usb/host/ehci-fsl.h
index cbc4220..9d18c6e 100644
--- a/drivers/usb/host/ehci-fsl.h
+++ b/drivers/usb/host/ehci-fsl.h
@@ -50,4 +50,7 @@
 #define UTMI_PHY_EN             (1<<9)
 #define ULPI_PHY_CLK_SEL        (1<<10)
 #define PHY_CLK_VALID		(1<<17)
+
+/* Retry count for checking UTMI PHY CLK validity */
+#define UTMI_PHY_CLK_VALID_CHK_RETRY 5
 #endif				/* _EHCI_FSL_H */
-- 
1.7.1