Disabling I2C_EN on resume as it was restored in
suspend when we set pci config to its original value.
ENXIO landing in rmi_smb_get_version, i2c-i802 debug
pointing at i801_check_post and guesswork from reading
probe which has this tweak.
i801_smbus 0000:00:1f.3: No response
rmi4_smbus 0-002c: failed to get SMBus version number!
i801_smbus 0000:00:1f.3: No response
rmi4_physical rmi4-00: rmi_driver_reset_handler: Failed to read current IRQ mask.
i801_smbus 0000:00:1f.3: No response
rmi4_f01 rmi4-00.fn01: Failed to restore normal operation: -6.
rmi4_f01 rmi4-00.fn01: Resume failed with code -6.
rmi4_physical rmi4-00: Failed to suspend functions: -6
rmi4_smbus 0-002c: Failed to resume device: -6
rmi4_f03 rmi4-00.fn03: rmi_f03_pt_write: Failed to write to F03 TX register (-6).
i801_smbus 0000:00:1f.3: No response
rmi4_f03 rmi4-00.fn03: rmi_f03_pt_write: Failed to write to F03 TX register (-6).
Signed-off-by: Alban Browaeys <alban.browaeys@xxxxxxxxx>
---
drivers/i2c/busses/i2c-i801.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/i2c/busses/i2c-i801.c b/drivers/i2c/busses/i2c-i801.c
index 9e12a53ef7b8..b7b6c8ee2176 100644
--- a/drivers/i2c/busses/i2c-i801.c
+++ b/drivers/i2c/busses/i2c-i801.c
@@ -1707,9 +1707,14 @@ static int i801_suspend(struct device *dev)
static int i801_resume(struct device *dev)
{
+ unsigned char temp;
struct pci_dev *pci_dev = to_pci_dev(dev);
struct i801_priv *priv = pci_get_drvdata(pci_dev);
+ pci_read_config_byte(pci_dev, SMBHSTCFG, &temp);
+ temp &= ~SMBHSTCFG_I2C_EN; /* SMBus timing */
+ pci_write_config_byte(pci_dev, SMBHSTCFG, temp);
+
i801_enable_host_notify(&priv->adapter);
return 0;
--
2.15.0
