linux-kernel - [PATCH 3.14 125/158] usb: musb: fix PHY power on/off

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Date:	Sun,  4 May 2014 11:40:34 -0400
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org,
	Pali Rohár <pali.rohar@...il.com>,
	Ivaylo Dimitrov <ivo.g.dimitrov.75@...il.com>,
	Michael Scott <hashcode0f@...il.com>,
	Stefan Roese <sr@...x.de>, Rabin Vincent <rabin@....in>,
	Felipe Balbi <balbi@...com>
Subject: [PATCH 3.14 125/158] usb: musb: fix PHY power on/off

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

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

From: Felipe Balbi <balbi@...com>

commit 3063a12be2b07c64e9802708a19489342e64c1a3 upstream.

commi 30a70b0 (usb: musb: fix obex in g_nokia.ko
causing kernel panic) removed phy_power_on()
and phy_power_off() calls from runtime PM callbacks
but it failed to note that the driver depended
on pm_runtime_get_sync() calls to power up the PHY,
thus leaving some platforms without any means to
have a working PHY.

Fix that by enabling the phy during omap2430_musb_init()
and killing it in omap2430_musb_exit().

Fixes: 30a70b0 (usb: musb: fix obex in g_nokia.ko causing kernel panic)
Cc: Pali Rohár <pali.rohar@...il.com>
Cc: Ivaylo Dimitrov <ivo.g.dimitrov.75@...il.com>
Reported-by: Michael Scott <hashcode0f@...il.com>
Tested-by: Michael Scott <hashcode0f@...il.com>
Tested-by: Stefan Roese <sr@...x.de>
Reported-by: Rabin Vincent <rabin@....in>
Signed-off-by: Felipe Balbi <balbi@...com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/usb/musb/omap2430.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/usb/musb/omap2430.c
+++ b/drivers/usb/musb/omap2430.c
@@ -416,6 +416,7 @@ static int omap2430_musb_init(struct mus
 		omap_musb_set_mailbox(glue);
 
 	phy_init(musb->phy);
+	phy_power_on(musb->phy);
 
 	pm_runtime_put_noidle(musb->controller);
 	return 0;
@@ -478,6 +479,7 @@ static int omap2430_musb_exit(struct mus
 	del_timer_sync(&musb_idle_timer);
 
 	omap2430_low_level_exit(musb);
+	phy_power_off(musb->phy);
 	phy_exit(musb->phy);
 
 	return 0;


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