On Fri, Sep 21, 2012 at 03:52:56PM +0530, Shubhrajyoti D wrote:
> Overrun also causes an internal flag to be set, which disables further
> reception. Before the next frame can
> be received, the MPU must:
> • Reset the RX FIFO.
> • clear the internal flag.
>
> In the uart mode a dummy read is needed. Add the same.
Very nice patch but I think commit log can be a bit more verbose.
Please make the problem a little clearer. Why do we even get that
interrupt fired if BRK_ERROR_BITS aren't set ?
> Signed-off-by: Shubhrajyoti D <shubhrajyoti@xxxxxx>
> ---
> - functional testing on omap4sdp
> - Verified idle and suspend path hits off on beagle.
>
> drivers/tty/serial/omap-serial.c | 7 +++++++
> 1 files changed, 7 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/tty/serial/omap-serial.c b/drivers/tty/serial/omap-serial.c
> index a0d4460..bc22a2b 100644
> --- a/drivers/tty/serial/omap-serial.c
> +++ b/drivers/tty/serial/omap-serial.c
> @@ -334,6 +334,13 @@ static unsigned int check_modem_status(struct uart_omap_port *up)
> static void serial_omap_rlsi(struct uart_omap_port *up, unsigned int lsr)
> {
> unsigned int flag;
> + unsigned char ch = 0;
> +
> + if (!(lsr & UART_LSR_BRK_ERROR_BITS))
> + return;
> +
> + if (likely(lsr & UART_LSR_DR))
> + ch = serial_in(up, UART_RX);
Maybe add a comment before this condition stating why this character
read is necessary ?
--
balbi
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