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| author | Stephen Warren <swarren@nvidia.com> | 2011-05-17 16:12:37 -0600 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-05-19 16:51:02 -0700 |
| commit | 5f873bae704cf8b7cbd64b5720912266286c9146 (patch) | |
| tree | 0e861218bdb25d0ad3f41aa569f89d0f56d59d18 /drivers/tty/serial/8250.c | |
| parent | 4539c24fe4f92c09ee668ef959d3e8180df619b9 (diff) | |
| download | blackbird-op-linux-5f873bae704cf8b7cbd64b5720912266286c9146.tar.gz blackbird-op-linux-5f873bae704cf8b7cbd64b5720912266286c9146.zip | |
tty/serial: Fix break handling for PORT_TEGRA
When a break is received, Tegra's UART apparently fills the FIFO with
0 bytes. These must be drained so that they aren't interpreted as actual
data received. This allows e.g. MAGIC_SYSRQ to work on Tegra's UARTs.
v2: Added FIXME comment to clear_rx_fifo
Originally-by: Laxman Dewangan <ldewangan@nvidia.com>
Cc: Laxman Dewangan <ldewangan@nvidia.com>
Signed-off-by: Stephen Warren <swarren@nvidia.com>
Acked-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/tty/serial/8250.c')
| -rw-r--r-- | drivers/tty/serial/8250.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/drivers/tty/serial/8250.c b/drivers/tty/serial/8250.c index a5e290de8c93..b40f7b90c81d 100644 --- a/drivers/tty/serial/8250.c +++ b/drivers/tty/serial/8250.c @@ -1433,6 +1433,27 @@ static void serial8250_enable_ms(struct uart_port *port) serial_out(up, UART_IER, up->ier); } +/* + * Clear the Tegra rx fifo after a break + * + * FIXME: This needs to become a port specific callback once we have a + * framework for this + */ +static void clear_rx_fifo(struct uart_8250_port *up) +{ + unsigned int status, tmout = 10000; + do { + status = serial_in(up, UART_LSR); + if (status & (UART_LSR_FIFOE | UART_LSR_BRK_ERROR_BITS)) + status = serial_in(up, UART_RX); + else + break; + if (--tmout == 0) + break; + udelay(1); + } while (1); +} + static void receive_chars(struct uart_8250_port *up, unsigned int *status) { @@ -1468,6 +1489,13 @@ receive_chars(struct uart_8250_port *up, unsigned int *status) lsr &= ~(UART_LSR_FE | UART_LSR_PE); up->port.icount.brk++; /* + * If tegra port then clear the rx fifo to + * accept another break/character. + */ + if (up->port.type == PORT_TEGRA) + clear_rx_fifo(up); + + /* * We do the SysRQ and SAK checking * here because otherwise the break * may get masked by ignore_status_mask |
