Messages in this thread Patch in this message | | | From | Haavard Skinnemoen <> | Subject | [PATCH 1/2] serial: Add flush_buffer() operation to uart_ops | Date | Mon, 30 Jun 2008 12:24:20 +0200 |
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Serial drivers using DMA (like the atmel_serial driver) tend to get very confused when the xmit buffer is flushed and nobody told them. They also tend to spew a lot of garbage since the DMA engine keeps running after the buffer is flushed and possibly refilled with unrelated data.
This patch adds a new flush_buffer operation to the uart_ops struct, along with a call to it from uart_flush_buffer() right after the xmit buffer has been cleared. The driver can implement this in order to syncronize its internal DMA state with the xmit buffer when the buffer is flushed.
Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com> --- Documentation/serial/driver | 11 +++++++++++ drivers/serial/serial_core.c | 2 ++ include/linux/serial_core.h | 1 + 3 files changed, 14 insertions(+), 0 deletions(-)
diff --git a/Documentation/serial/driver b/Documentation/serial/driver index 88ad615..77ba0af 100644 --- a/Documentation/serial/driver +++ b/Documentation/serial/driver @@ -186,6 +186,17 @@ hardware. Locking: port_sem taken. Interrupts: caller dependent. + flush_buffer(port) + Flush any write buffers, reset any DMA state and stop any + ongoing DMA transfers. + + This will be called whenever the port->info->xmit circular + buffer is cleared. + + Locking: port->lock taken. + Interrupts: locally disabled. + This call must not sleep + set_termios(port,termios,oldtermios) Change the port parameters, including word length, parity, stop bits. Update read_status_mask and ignore_status_mask to indicate diff --git a/drivers/serial/serial_core.c b/drivers/serial/serial_core.c index c9b64e7..799f739 100644 --- a/drivers/serial/serial_core.c +++ b/drivers/serial/serial_core.c @@ -573,6 +573,8 @@ static void uart_flush_buffer(struct tty_struct *tty) spin_lock_irqsave(&port->lock, flags); uart_circ_clear(&state->info->xmit); + if (port->ops->flush_buffer) + port->ops->flush_buffer(port); spin_unlock_irqrestore(&port->lock, flags); tty_wakeup(tty); } diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h index d8f31de..1d2faa6 100644 --- a/include/linux/serial_core.h +++ b/include/linux/serial_core.h @@ -190,6 +190,7 @@ struct uart_ops { void (*break_ctl)(struct uart_port *, int ctl); int (*startup)(struct uart_port *); void (*shutdown)(struct uart_port *); + void (*flush_buffer)(struct uart_port *); void (*set_termios)(struct uart_port *, struct ktermios *new, struct ktermios *old); void (*set_ldisc)(struct uart_port *); -- 1.5.5.4
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