From: Ramneek Mehresh <ramneek.mehresh@xxxxxxxxxxxxx>
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.mehresh@xxxxxxxxxxxxx>
Signed-off-by: Suresh Gupta <suresh.gupta@xxxxxxxxxxxxx>
Signed-off-by: Yinbo Zhu <yinbo.zhu@xxxxxxx>
---
drivers/usb/host/ehci-fsl.c | 5 +++++
drivers/usb/host/fsl-mph-dr-of.c | 4 ++++
2 files changed, 9 insertions(+), 0 deletions(-)
diff --git a/drivers/usb/host/ehci-fsl.c b/drivers/usb/host/ehci-fsl.c
index 8b0f3ed..e276067 100644
--- a/drivers/usb/host/ehci-fsl.c
+++ b/drivers/usb/host/ehci-fsl.c
@@ -236,6 +236,11 @@ static int ehci_fsl_setup_phy(struct usb_hcd *hcd,
portsc |= PORT_PTS_PTW;
/* fall through */
case FSL_USB2_PHY_UTMI:
+ if (pdata->has_fsl_erratum_a006918) {
+ pr_warn("fsl-ehci: 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 4f8b8a0..bdc8812 100644
--- a/drivers/usb/host/fsl-mph-dr-of.c
+++ b/drivers/usb/host/fsl-mph-dr-of.c
@@ -230,6 +230,10 @@ static int fsl_usb2_mph_dr_of_probe(struct platform_device *ofdev)
else
pdata->has_fsl_erratum_14 = 0;
+ if (of_get_property(np, "fsl,erratum_a006918", NULL))
+ pdata->has_fsl_erratum_a006918 = 1;
+ else
+ pdata->has_fsl_erratum_a006918 = 0;
/*
* Determine whether phy_clk_valid needs to be checked
--
1.7.1
