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| author | Nikhil Badola <nikhil.badola@freescale.com> | 2015-06-15 12:17:29 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-07-23 01:37:32 +0200 |
| commit | 523f1dec58408b36e7683a3d61a0286eed1fc1c8 (patch) | |
| tree | b618dd10b8480855d0887a6ed865b91c6a391de2 /drivers/usb/host/ehci-fsl.c | |
| parent | drivers:usb:fsl: Replace macros with enumerated type (diff) | |
| download | linux-523f1dec58408b36e7683a3d61a0286eed1fc1c8.tar.xz linux-523f1dec58408b36e7683a3d61a0286eed1fc1c8.zip | |
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>
Diffstat (limited to 'drivers/usb/host/ehci-fsl.c')
| -rw-r--r-- | drivers/usb/host/ehci-fsl.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/usb/host/ehci-fsl.c b/drivers/usb/host/ehci-fsl.c index 5352e74b92e2..716aa8be1d6f 100644 --- a/drivers/usb/host/ehci-fsl.c +++ b/drivers/usb/host/ehci-fsl.c @@ -129,6 +129,15 @@ static int fsl_ehci_drv_probe(struct platform_device *pdev) 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); |