linux-kernel - [PATCH 1/2] drivers: usb: fsl: Modify phy clk valid bit checking

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Date:	Tue, 14 Jul 2015 17:28:10 +0530
From:	Nikhil Badola <nikhil.badola@...escale.com>
To:	<linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:	<stern@...land.harvard.edu>, <gregkh@...uxfoundation.org>,
	Nikhil Badola <nikhil.badola@...escale.com>
Subject: [PATCH 1/2] drivers: usb: fsl: Modify phy clk valid bit checking

Phy_clk_valid bit is checked only when the boolean
property phy-clk-valid in present in usb node device tree.
This property is added to the usb node via device tree fixup.

Signed-off-by: Nikhil Badola <nikhil.badola@...escale.com>
---
Dependent on patchset : https://lkml.org/lkml/2015/6/15/177
and subsequent patches

 drivers/usb/host/ehci-fsl.c      | 16 ++++++++--------
 drivers/usb/host/fsl-mph-dr-of.c |  9 +++++++++
 include/linux/fsl_devices.h      |  1 +
 3 files changed, 18 insertions(+), 8 deletions(-)

diff --git a/drivers/usb/host/ehci-fsl.c b/drivers/usb/host/ehci-fsl.c
index b04c9db..05ebe3d 100644
--- a/drivers/usb/host/ehci-fsl.c
+++ b/drivers/usb/host/ehci-fsl.c
@@ -230,14 +230,14 @@ static int ehci_fsl_setup_phy(struct usb_hcd *hcd,
 		break;
 	}
 
-	if (pdata->have_sysif_regs &&
-	    pdata->controller_ver > FSL_USB_VER_1_6 &&
-	    (phy_mode == FSL_USB2_PHY_ULPI)) {
-		/* check PHY_CLK_VALID to get phy clk valid */
-		if (!(spin_event_timeout(in_be32(non_ehci + FSL_SOC_USB_CTRL) &
-				PHY_CLK_VALID, FSL_USB_PHY_CLK_TIMEOUT, 0) ||
-				in_be32(non_ehci + FSL_SOC_USB_PRICTRL))) {
-			dev_warn(hcd->self.controller, "USB PHY clock invalid\n");
+	/*
+	 * check PHY_CLK_VALID to determine phy clock presence before writing
+	 * to portsc
+	 */
+	if (pdata->check_phy_clk_valid) {
+		if (!(in_be32(non_ehci + FSL_SOC_USB_CTRL) & PHY_CLK_VALID)) {
+			dev_warn(hcd->self.controller,
+				 "USB PHY clock invalid\n");
 			return -EINVAL;
 		}
 	}
diff --git a/drivers/usb/host/fsl-mph-dr-of.c b/drivers/usb/host/fsl-mph-dr-of.c
index 631fc50..9f73141 100644
--- a/drivers/usb/host/fsl-mph-dr-of.c
+++ b/drivers/usb/host/fsl-mph-dr-of.c
@@ -222,6 +222,15 @@ static int fsl_usb2_mph_dr_of_probe(struct platform_device *ofdev)
 	else
 		pdata->has_fsl_erratum_a007792 = 0;
 
+	/*
+	 * Determine whether phy_clk_valid needs to be checked
+	 * by reading property in device tree
+	 */
+	if (of_get_property(np, "phy-clk-valid", NULL))
+		pdata->check_phy_clk_valid = 1;
+	else
+		pdata->check_phy_clk_valid = 0;
+
 	if (pdata->have_sysif_regs) {
 		if (pdata->controller_ver == FSL_USB_VER_NONE) {
 			dev_warn(&ofdev->dev, "Could not get controller version\n");
diff --git a/include/linux/fsl_devices.h b/include/linux/fsl_devices.h
index 070d9ae..cebdbbb 100644
--- a/include/linux/fsl_devices.h
+++ b/include/linux/fsl_devices.h
@@ -99,6 +99,7 @@ struct fsl_usb2_platform_data {
 	unsigned	suspended:1;
 	unsigned	already_suspended:1;
 	unsigned        has_fsl_erratum_a007792:1;
+	unsigned        check_phy_clk_valid:1;
 
 	/* register save area for suspend/resume */
 	u32		pm_command;
-- 
2.1.0

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