linux-kernel - [PATCH 4.4 011/137] phy: twl4030-usb: Fix unbalanced pm_runtime

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Message-Id: <20160224033417.686279431@linuxfoundation.org>
Date:	Tue, 23 Feb 2016 19:32:22 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Bin Liu <b-liu@...com>,
	Felipe Balbi <balbi@...com>,
	Kishon Vijay Abraham I <kishon@...com>,
	NeilBrown <neil@...wn.name>, Tony Lindgren <tony@...mide.com>
Subject: [PATCH 4.4 011/137] phy: twl4030-usb: Fix unbalanced pm_runtime_enable on module reload

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Tony Lindgren <tony@...mide.com>

commit 58a66dba1beac2121d931cda4682ae4d40816af5 upstream.

If we reload phy-twl4030-usb, we get a warning about unbalanced
pm_runtime_enable. Let's fix the issue and also fix idling of the
device on unload before we attempt to shut it down.

If we don't properly idle the PHY before shutting it down on removal,
the twl4030 ends up consuming about 62mW of extra power compared to
running idle with the module loaded.

Cc: Bin Liu <b-liu@...com>
Cc: Felipe Balbi <balbi@...com>
Cc: Kishon Vijay Abraham I <kishon@...com>
Cc: NeilBrown <neil@...wn.name>
Signed-off-by: Tony Lindgren <tony@...mide.com>
Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/phy/phy-twl4030-usb.c |   13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

--- a/drivers/phy/phy-twl4030-usb.c
+++ b/drivers/phy/phy-twl4030-usb.c
@@ -715,6 +715,7 @@ static int twl4030_usb_probe(struct plat
 	pm_runtime_use_autosuspend(&pdev->dev);
 	pm_runtime_set_autosuspend_delay(&pdev->dev, 2000);
 	pm_runtime_enable(&pdev->dev);
+	pm_runtime_get_sync(&pdev->dev);
 
 	/* Our job is to use irqs and status from the power module
 	 * to keep the transceiver disabled when nothing's connected.
@@ -758,6 +759,13 @@ static int twl4030_usb_remove(struct pla
 	/* set transceiver mode to power on defaults */
 	twl4030_usb_set_mode(twl, -1);
 
+	/* idle ulpi before powering off */
+	if (cable_present(twl->linkstat))
+		pm_runtime_put_noidle(twl->dev);
+	pm_runtime_mark_last_busy(twl->dev);
+	pm_runtime_put_sync_suspend(twl->dev);
+	pm_runtime_disable(twl->dev);
+
 	/* autogate 60MHz ULPI clock,
 	 * clear dpll clock request for i2c access,
 	 * disable 32KHz
@@ -772,11 +780,6 @@ static int twl4030_usb_remove(struct pla
 	/* disable complete OTG block */
 	twl4030_usb_clear_bits(twl, POWER_CTRL, POWER_CTRL_OTG_ENAB);
 
-	if (cable_present(twl->linkstat))
-		pm_runtime_put_noidle(twl->dev);
-	pm_runtime_mark_last_busy(twl->dev);
-	pm_runtime_put(twl->dev);
-
 	return 0;
 }