linux-kernel - [PATCH v3 3/5] usb: host: Stops USB controller init if PLL fails to lock

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Date:   Wed, 23 Jan 2019 07:05:36 +0000
From:   Yinbo Zhu <yinbo.zhu@....com>
To:     Alan Stern <stern@...land.harvard.edu>
CC:     Yinbo Zhu <yinbo.zhu@....com>, Xiaobo Xie <xiaobo.xie@....com>,
        Jerry Huang <jerry.huang@....com>,
        Ran Wang <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-usb@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH v3 3/5] usb: host: Stops USB controller init if PLL fails to
 lock

From: Ramneek Mehresh <ramneek.mehresh@...escale.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 |    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