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usb: host: Stops USB controller init if PLL fails to lock 

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@freescale.com>
Signed-off-by: Suresh Gupta <suresh.gupta@freescale.com>
Signed-off-by: Yinbo Zhu <yinbo.zhu@nxp.com>
Link: https://lore.kernel.org/r/20190624072219.15258-4-yinbo.zhu@nxp.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ramneek Mehresh 2019-06-24 15:22:18 +08:00 committed by Greg Kroah-Hartman
parent 1a4dcb8aed
commit c1f9d2e411
2 changed files with 11 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
drivers/usb/host/ehci-fsl.c
View File

@ -236,6 +236,15 @@ static int ehci_fsl_setup_phy(struct usb_hcd *hcd,
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;
}
/* fall through */
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

3
drivers/usb/host/fsl-mph-dr-of.c
View File

@ -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