linux-kernel - [PATCH v8 4/5] usb: host: Stops USB controller init if PLL fails to lock

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Date:   Mon, 24 Jun 2019 15:22:18 +0800
From:   Yinbo Zhu <yinbo.zhu@....com>
To:     Alan Stern <stern@...land.harvard.edu>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     yinbo.zhu@....com, xiaobo.xie@....com, jiafei.pan@....com,
        Ramneek Mehresh <ramneek.mehresh@...escale.com>,
        Nikhil Badola <nikhil.badola@...escale.com>,
        Ran Wang <ran.wang_1@....com>, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v8 4/5] 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>
---
Change in v2:
		replace Yinbo.Zhu with Yinbo Zhu.
Change in v5:
		add the erratum commont replace "/* fall through */".		
Change in v6:
		remove "/* fall through */".
Change in v7:
		keep v5 change.
Change in v8:
		Add "/* fall through */" for case FSL_USB2_PHY_UTMIII.


 drivers/usb/host/ehci-fsl.c      | 9 +++++++++
 drivers/usb/host/fsl-mph-dr-of.c | 3 ++-
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/host/ehci-fsl.c b/drivers/usb/host/ehci-fsl.c
index 8f3bf3efb038..9e9c232e896f 100644
--- a/drivers/usb/host/ehci-fsl.c
+++ b/drivers/usb/host/ehci-fsl.c
@@ -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
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