• Govindraj.R's avatar
    ARM: OMAP2+: UART: Remove omap_uart_can_sleep and add pm_qos · 2fd14964
    Govindraj.R authored
    Omap_uart_can_sleep function blocks system wide low power state until
    uart is active remove this func and add qos requests to prevent
    MPU from transitioning.
    
    Keep qos request to default value which will allow MPU to transition
    and while uart baud rate is available calculate the latency value
    from the baudrate and use the same to hold constraint while uart clocks
    are enabled, and if uart is auto-idled the constraint is updated with
    default constraint value allowing MPU to transition.
    
    Qos requests are blocking notifier calls so put these requests to
    work queue, also the driver uses irq_safe version of runtime API's
    and callbacks can be called in interrupt disabled context.
    So to avoid warn on slow path warning while using qos update
    API's from runtime callbacks use the qos_work_queue.
    
    During bootup the runtime_resume call backs might not be called and runtime
    callback gets called only after uart is idled by setting the autosuspend
    timeout. So qos_request from runtime resume callback might not activated during
    boot if uart baudrate is calculated during bootup for console uart, so schedule
    the qos_work queue once we calc_latency while configuring the uart port.
    
    Flush and complete any pending qos jobs in work queue while suspending.
    Signed-off-by: default avatarGovindraj.R <govindraj.raja@ti.com>
    Acked-by: Greg Kroah-Hartman <gregkh@suse.de> (for drivers/tty changes)
    Signed-off-by: default avatarKevin Hilman <khilman@ti.com>
    2fd14964
serial.c 11.4 KB