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Commit bd8505f3 authored by Jean Delvare's avatar Jean Delvare Committed by Greg Kroah-Hartman
Browse files

i2c: i801: Restore configuration at shutdown 



commit f7f6d915a10f7f2bce17e3b1b7d3376562395a28 upstream.

On some systems, the BIOS expects certain SMBus register values to
match the hardware defaults. Restore these configuration registers at
shutdown time to avoid confusing the BIOS. This avoids hard-locking
such systems upon reboot.

Signed-off-by: default avatarJean Delvare <jdelvare@suse.de>
Tested-by: default avatarJason Andryuk <jandryuk@gmail.com>
Signed-off-by: default avatarWolfram Sang <wsa@the-dreams.de>
Cc: stable@vger.kernel.org
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 53defab7

drivers/i2c/busses/i2c-i801.c

+10 −0
Original line number Diff line number Diff line
@@ -1696,6 +1696,15 @@ static void i801_remove(struct pci_dev *dev) 
	 */

}



static void i801_shutdown(struct pci_dev *dev)

{

	struct i801_priv *priv = pci_get_drvdata(dev);



	/* Restore config registers to avoid hard hang on some systems */

	i801_disable_host_notify(priv);

	pci_write_config_byte(dev, SMBHSTCFG, priv->original_hstcfg);

}



#ifdef CONFIG_PM

static int i801_suspend(struct device *dev)

{
@@ -1728,6 +1737,7 @@ static struct pci_driver i801_driver = { 
	.id_table	= i801_ids,

	.probe		= i801_probe,

	.remove		= i801_remove,

	.shutdown	= i801_shutdown,

	.driver		= {

		.pm	= &i801_pm_ops,

	},