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i2c: i801: Restore configuration at shutdown 

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: Jean Delvare <jdelvare@suse.de>
Tested-by: Jason Andryuk <jandryuk@gmail.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Cc: stable@vger.kernel.org
This commit is contained in:
Jean Delvare 2018-04-11 18:05:34 +02:00 committed by Wolfram Sang
parent a086bb8317
commit f7f6d915a1
1 changed files with 10 additions and 0 deletions
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10
drivers/i2c/busses/i2c-i801.c
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@ -1701,6 +1701,15 @@ 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)
{
@ -1730,6 +1739,7 @@ static struct pci_driver i801_driver = {
.id_table = i801_ids,
.probe = i801_probe,
.remove = i801_remove,
.shutdown = i801_shutdown,
.driver = {
.pm = &i801_pm_ops,
},