linux-kernel - [PATCH v1 3/6] usb: host: Stops USB controller init if PLL fails to lock

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Date:   Mon, 21 Jan 2019 11:13:01 +0800
From:   Yinbo Zhu <yinbo.zhu@....com>
To:     Alan Stern <stern@...land.harvard.edu>
Cc:     yinbo.zhu@....com, xiaobo.xie@....com, jerry.huang@....com,
        ran.wang_1@....com,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Ramneek Mehresh <ramneek.mehresh@...escale.com>,
        Nikhil Badola <nikhil.badola@...escale.com>,
        Suresh Gupta <suresh.gupta@...escale.com>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v1 3/6] usb: host: Stops USB controller init if PLL fails to lock

From: yinbo.zhu <yinbo.zhu@....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.mehresh@...escale.com>
Signed-off-by: Suresh Gupta <suresh.gupta@...escale.com>
Signed-off-by: yinbo.zhu <yinbo.zhu@....com>
---
 drivers/usb/host/ehci-fsl.c      |    5 +++++
 drivers/usb/host/fsl-mph-dr-of.c |    5 +++++
 2 files changed, 10 insertions(+), 0 deletions(-)

diff --git a/drivers/usb/host/ehci-fsl.c b/drivers/usb/host/ehci-fsl.c
index a28ec1e..6884130 100644
--- a/drivers/usb/host/ehci-fsl.c
+++ b/drivers/usb/host/ehci-fsl.c
@@ -224,6 +224,11 @@ 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 677f9d5..7e07701 100644
--- a/drivers/usb/host/fsl-mph-dr-of.c
+++ b/drivers/usb/host/fsl-mph-dr-of.c
@@ -225,6 +225,11 @@ static int fsl_usb2_mph_dr_of_probe(struct platform_device *ofdev)
 	pdata->has_fsl_erratum_a005697 =
 		of_property_read_bool(np, "fsl,usb_erratum-a005697");
 
+	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
 	 * by reading property in device tree
-- 
1.7.1