On Wed, 17 Nov 2021 11:45:09 +0200, Jarkko Nikula wrote: > Currently interrupt storm will occur from i2c-i801 after first > transaction if SMB_ALERT signal is enabled and ever asserted. It is > enough if the signal is asserted once even before the driver is loaded > and does not recover because that interrupt is not acknowledged. > > This fix aims to fix it by two ways: > - Add acknowledging for the SMB_ALERT interrupt status > - Disable the SMB_ALERT interrupt on platforms where possible since the > driver currently does not make use for it > > Acknowledging resets the SMB_ALERT interrupt status on all platforms and > also should help to avoid interrupt storm on older platforms where the > SMB_ALERT interrupt disabling is not available. > > For simplicity this fix reuses the host notify feature for disabling and > restoring original register value. > > Link: https://bugzilla.kernel.org/show_bug.cgi?id=177311 > Reported-by: ck+kernelbugzilla@xxxxxxxxxxx > Reported-by: stephane.poignant@xxxxxxxxxxxxxx > Signed-off-by: Jarkko Nikula <jarkko.nikula@xxxxxxxxxxxxxxx> > (...) Reviewed-by: Jean Delvare <jdelvare@xxxxxxx> Tested-by: Jean Delvare <jdelvare@xxxxxxx> -- Jean Delvare SUSE L3 Support
