From: Ramneek Mehresh <ramneek.mehr...@freescale.com> USB erratum-A006918 workaround tries to start internal PHY inside uboot (when PLL fails to lock). However, if the workaround also fails, then USB initialization is also stopped inside Linux. Erratum-A006918 workaround failure creates "fsl,erratum_a006918" node in device-tree. Presence of this node in device-tree is used to stop USB controller initialization in Linux
Signed-off-by: Ramneek Mehresh <ramneek.mehr...@freescale.com> Signed-off-by: Suresh Gupta <suresh.gu...@freescale.com> Signed-off-by: Yinbo Zhu <yinbo....@nxp.com> --- Change in v6: add a "Fall through" comment drivers/usb/host/ehci-fsl.c | 10 +++++++++- drivers/usb/host/fsl-mph-dr-of.c | 3 ++- 2 files changed, 11 insertions(+), 2 deletions(-) diff --git a/drivers/usb/host/ehci-fsl.c b/drivers/usb/host/ehci-fsl.c index 8f3bf3efb038..86ae37086a74 100644 --- a/drivers/usb/host/ehci-fsl.c +++ b/drivers/usb/host/ehci-fsl.c @@ -234,8 +234,16 @@ static int ehci_fsl_setup_phy(struct usb_hcd *hcd, break; case FSL_USB2_PHY_UTMI_WIDE: portsc |= PORT_PTS_PTW; - /* fall through */ case FSL_USB2_PHY_UTMI: + /* Presence of this node "has_fsl_erratum_a006918" + * in device-tree is used to stop USB controller + * initialization in Linux + */ + if (pdata->has_fsl_erratum_a006918) { + dev_warn(dev, "USB PHY clock invalid\n"); + return -EINVAL; + } + 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 diff --git a/drivers/usb/host/fsl-mph-dr-of.c b/drivers/usb/host/fsl-mph-dr-of.c index 4f8b8a08c914..762b97600ab0 100644 --- a/drivers/usb/host/fsl-mph-dr-of.c +++ b/drivers/usb/host/fsl-mph-dr-of.c @@ -224,13 +224,14 @@ static int fsl_usb2_mph_dr_of_probe(struct platform_device *ofdev) of_property_read_bool(np, "fsl,usb-erratum-a005275"); pdata->has_fsl_erratum_a005697 = of_property_read_bool(np, "fsl,usb_erratum-a005697"); + pdata->has_fsl_erratum_a006918 = + of_property_read_bool(np, "fsl,usb_erratum-a006918"); if (of_get_property(np, "fsl,usb_erratum_14", NULL)) pdata->has_fsl_erratum_14 = 1; else pdata->has_fsl_erratum_14 = 0; - /* * Determine whether phy_clk_valid needs to be checked * by reading property in device tree -- 2.17.1