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i2c: i801: Restore configuration at shutdown

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commit f7f6d915a1 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: 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
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jean Delvare
2018-04-11 18:05:34 +02:00
committed by Greg Kroah-Hartman
parent 44ff2389a8
commit fd5cc02cbe
1 changed files with 10 additions and 0 deletions
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10
drivers/i2c/busses/i2c-i801.c
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@@ -1700,6 +1700,15 @@ 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)
{
@@ -1729,6 +1738,7 @@ static struct pci_driver i801_driver = {
.id_table = i801_ids,
.probe = i801_probe,
.remove = i801_remove,
.shutdown = i801_shutdown,
.driver = {
.pm = &i801_pm_ops,
},