fsl/usb: Resolve PHY_CLK_VLD instability issue for ULPI phy

commit ad1260e9fbf768d6bed227d9604ebee76a84aae3 upstream.

For controller versions greater than 1.6, setting ULPI_PHY_CLK_SEL
bit when USB_EN bit is already set causes instability issues with
PHY_CLK_VLD bit. So USB_EN is set only for IP controller version
below 1.6 before setting ULPI_PHY_CLK_SEL bit

Signed-off-by: Ramneek Mehresh <ramneek.mehresh@freescale.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/host/ehci-fsl.c b/drivers/usb/host/ehci-fsl.c
index 3be3df233a0e0b73b8bdc198d5aae050b6e520be..3c0a49a298ddfa593fd00f3e9c6fe8d883f25c22 100644 (file)
--- a/drivers/usb/host/ehci-fsl.c
+++ b/drivers/usb/host/ehci-fsl.c
@@ -130,7 +130,7 @@ static int usb_hcd_fsl_probe(const struct hc_driver *driver,
        }
 
        /* Enable USB controller, 83xx or 8536 */
-       if (pdata->have_sysif_regs)
+       if (pdata->have_sysif_regs && pdata->controller_ver < FSL_USB_VER_1_6)
                setbits32(hcd->regs + FSL_SOC_USB_CTRL, 0x4);
 
        /* Don't need to set host mode here. It will be done by tdi_reset() */
@@ -232,15 +232,9 @@ static int ehci_fsl_setup_phy(struct usb_hcd *hcd,
        case FSL_USB2_PHY_ULPI:
                if (pdata->have_sysif_regs && pdata->controller_ver) {
                        /* controller version 1.6 or above */
+                       clrbits32(non_ehci + FSL_SOC_USB_CTRL, UTMI_PHY_EN);
                        setbits32(non_ehci + FSL_SOC_USB_CTRL,
-                                       ULPI_PHY_CLK_SEL);
-                       /*
-                        * Due to controller issue of PHY_CLK_VALID in ULPI
-                        * mode, we set USB_CTRL_USB_EN before checking
-                        * PHY_CLK_VALID, otherwise PHY_CLK_VALID doesn't work.
-                        */
-                       clrsetbits_be32(non_ehci + FSL_SOC_USB_CTRL,
-                                       UTMI_PHY_EN, USB_CTRL_USB_EN);
+                               ULPI_PHY_CLK_SEL | USB_CTRL_USB_EN);
                }
                portsc |= PORT_PTS_ULPI;
                break;