drivers: usb :fsl: Implement Workaround for USB Erratum A007792
USB controller version-2.5 requires to enable internal UTMI
phy and program PTS field in PORTSC register before asserting
controller reset. This is must for successful resetting of the
controller and subsequent enumeration of usb devices
Signed-off-by: Nikhil Badola <nikhil.badola@freescale.com>
Signed-off-by: Suresh Gupta <suresh.gupta@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 5352e74..716aa8b 100644
--- a/drivers/usb/host/ehci-fsl.c
+++ b/drivers/usb/host/ehci-fsl.c
@@ -129,6 +129,15 @@
if (pdata->have_sysif_regs && pdata->controller_ver < FSL_USB_VER_1_6)
setbits32(hcd->regs + FSL_SOC_USB_CTRL, 0x4);
+ /*
+ * Enable UTMI phy and program PTS field in UTMI mode before asserting
+ * controller reset for USB Controller version 2.5
+ */
+ if (pdata->has_fsl_erratum_a007792) {
+ writel_be(CTRL_UTMI_PHY_EN, hcd->regs + FSL_SOC_USB_CTRL);
+ writel(PORT_PTS_UTMI, hcd->regs + FSL_SOC_USB_PORTSC1);
+ }
+
/* Don't need to set host mode here. It will be done by tdi_reset() */
retval = usb_add_hcd(hcd, irq, IRQF_SHARED);