• Ashish Jangam's avatar
    mfd: da9052/53 lockup fix · 0a8c290a
    Ashish Jangam authored
    An issue has been reported where the PMIC either locks up or fails to
    respond following a system Reset. This could result in a second write
    in which the bus writes the current content of the write buffer to address
    of the last I2C access.
    
    The failure case is where this unwanted write transfers incorrect data to
    a critical register.
    
    This patch fixes this issue to by following any read or write with a dummy read
    to a safe register address. A safe register address is one where the contents
    will not affect the operation of the system.
    Signed-off-by: default avatarAshish Jangam <ashish.jangam@kpitcummins.com>
    Signed-off-by: default avatarSamuel Ortiz <sameo@linux.intel.com>
    0a8c290a
da9052-i2c.c 4.97 KB