• Dylan Rajaratnam's avatar
    [media] img-ir/hw: Always read data to clear buffer · ea0de4ec
    Dylan Rajaratnam authored
    A problem was found on Polaris where if the unit it booted via the power
    button on the infrared remote then the next button press on the remote
    would return the key code used to power on the unit.
    
    The sequence is:
     - The polaris powered off but with the powerdown controller (PDC) block
       still powered.
     - Press power key on remote, IR block receives the key.
     - Kernel starts, IR code is in IMG_IR_DATA_x but neither IMG_IR_RXDVAL
       or IMG_IR_RXDVALD2 are set.
     - Wait any amount of time.
     - Press any key.
     - IMG_IR_RXDVAL or IMG_IR_RXDVALD2 is set but IMG_IR_DATA_x is
       unchanged since the powerup key data was never read.
    
    This is worked around by always reading the IMG_IR_DATA_x in
    img_ir_set_decoder(), rather than only when the IMG_IR_RXDVAL or
    IMG_IR_RXDVALD2 bit is set.
    Signed-off-by: default avatarDylan Rajaratnam <dylan.rajaratnam@imgtec.com>
    Signed-off-by: default avatarJames Hogan <james.hogan@imgtec.com>
    Cc: <stable@vger.kernel.org> # v3.15+
    Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@osg.samsung.com>
    ea0de4ec
img-ir-hw.c 30.3 KB