linux-kernel - [PATCH] usb: dwc3: core: Don't try to get PHYs during suspend/resume

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Message-ID: <1515589914-23460-1-git-send-email-rogerq@ti.com>
Date:   Wed, 10 Jan 2018 15:11:54 +0200
From:   Roger Quadros <rogerq@...com>
To:     <balbi@...nel.org>
CC:     <vigneshr@...com>, <gregkh@...uxfoundation.org>,
        <linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Roger Quadros <rogerq@...com>,
        "linux-stable # = v4 . 13" <stable@...r.kernel.org>
Subject: [PATCH] usb: dwc3: core: Don't try to get PHYs during suspend/resume

The USB PHYs should be requested only once during the life cycle of
this driver.

As dwc3_core_init() is called during system suspend/resume
it will result in multiple calls to dwc3_core_get_phy() which is wrong.

To prevent that let's move dwc3_core_get_phy() call
outside dwc3_core_init().

Fixes: 541768b08a4 ("usb: dwc3: core: Call dwc3_core_get_phy() before initializing phys")
Cc: linux-stable <stable@...r.kernel.org> # >= v4.13
Signed-off-by: Roger Quadros <rogerq@...com>
---
 drivers/usb/dwc3/core.c | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index 0783250..1274251 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -722,8 +722,6 @@ static void dwc3_core_setup_global_control(struct dwc3 *dwc)
 	dwc3_writel(dwc->regs, DWC3_GCTL, reg);
 }
 
-static int dwc3_core_get_phy(struct dwc3 *dwc);
-
 /**
  * dwc3_core_init - Low-level initialization of DWC3 Core
  * @dwc: Pointer to our controller context structure
@@ -754,10 +752,6 @@ static int dwc3_core_init(struct dwc3 *dwc)
 			dwc->maximum_speed = USB_SPEED_HIGH;
 	}
 
-	ret = dwc3_core_get_phy(dwc);
-	if (ret)
-		goto err0;
-
 	ret = dwc3_core_soft_reset(dwc);
 	if (ret)
 		goto err0;
@@ -1177,6 +1171,10 @@ static int dwc3_probe(struct platform_device *pdev)
 	platform_set_drvdata(pdev, dwc);
 	dwc3_cache_hwparams(dwc);
 
+	ret = dwc3_core_get_phy(dwc);
+	if (ret)
+		goto err0;
+
 	spin_lock_init(&dwc->lock);
 
 	pm_runtime_set_active(dev);
-- 
cheers,
-roger

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