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authorJean Delvare <jdelvare@suse.de>2018-04-11 18:05:34 +0200
committerWolfram Sang <wsa@the-dreams.de>2018-04-11 23:08:13 +0200
commitf7f6d915a10f7f2bce17e3b1b7d3376562395a28 (patch)
tree16fe45f9a16a4827353f515a50bbbceac1657d17 /drivers/i2c/busses/i2c-i801.c
parenta086bb8317303dd74725dca933b9b29575159382 (diff)
downloadlinux-stericsson-f7f6d915a10f7f2bce17e3b1b7d3376562395a28.tar.gz
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
Diffstat (limited to 'drivers/i2c/busses/i2c-i801.c')
-rw-r--r--drivers/i2c/busses/i2c-i801.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/i2c/busses/i2c-i801.c b/drivers/i2c/busses/i2c-i801.c
index 17aa20a55642..e0d59e9ff3c6 100644
--- a/drivers/i2c/busses/i2c-i801.c
+++ b/drivers/i2c/busses/i2c-i801.c
@@ -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,
},