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From linux-usb-owner@vger.kernel.org Thu Aug 19 10:36:21 2010
From: Felipe Balbi <felipe.balbi@nokia.com>
To: Greg KH <greg@kroah.com>
Cc: Tony Lindgren <tony@atomide.com>,
David Brownell <david-b@pacbell.net>,
Felipe Balbi <felipe.balbi@nokia.com>
Subject: USB: otg: twl4030: fix wrong assumption of starting state
Date: Wed, 11 Aug 2010 13:02:32 +0300
Message-Id: <1281520952-27981-1-git-send-email-felipe.balbi@nokia.com>
From: Felipe Balbi <felipe.balbi@nokia.com>
The reset state of twl4030-usb is not sleeping, it starts
up awaken and we need to disable it if we have booted
with a disconnected cable to avoid over consumption on
the default state.
To avoid problems later, we read the current state of the
transceiver from the PHY_PWR_CTRL register. The bootloader
can, anyways, put the device to sleep before us.
Tested on a custom OMAP board.
Signed-off-by: Felipe Balbi <felipe.balbi@nokia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---
drivers/usb/otg/twl4030-usb.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
--- a/drivers/usb/otg/twl4030-usb.c
+++ b/drivers/usb/otg/twl4030-usb.c
@@ -550,6 +550,7 @@ static int __devinit twl4030_usb_probe(s
struct twl4030_usb_data *pdata = pdev->dev.platform_data;
struct twl4030_usb *twl;
int status, err;
+ u8 pwr;
if (!pdata) {
dev_dbg(&pdev->dev, "platform_data not available\n");
@@ -568,7 +569,10 @@ static int __devinit twl4030_usb_probe(s
twl->otg.set_peripheral = twl4030_set_peripheral;
twl->otg.set_suspend = twl4030_set_suspend;
twl->usb_mode = pdata->usb_mode;
- twl->asleep = 1;
+
+ pwr = twl4030_usb_read(twl, PHY_PWR_CTRL);
+
+ twl->asleep = (pwr & PHY_PWR_PHYPWD);
/* init spinlock for workqueue */
spin_lock_init(&twl->lock);
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