diff options
Diffstat (limited to 'packages/linux/linux-2.6.18/add-flush_buffer-operation-to-uart_ops.patch')
| -rw-r--r-- | packages/linux/linux-2.6.18/add-flush_buffer-operation-to-uart_ops.patch | 71 |
1 files changed, 0 insertions, 71 deletions
diff --git a/packages/linux/linux-2.6.18/add-flush_buffer-operation-to-uart_ops.patch b/packages/linux/linux-2.6.18/add-flush_buffer-operation-to-uart_ops.patch deleted file mode 100644 index 0c9b919900..0000000000 --- a/packages/linux/linux-2.6.18/add-flush_buffer-operation-to-uart_ops.patch +++ /dev/null @@ -1,71 +0,0 @@ -From nobody Mon Sep 17 00:00:00 2001 -From: Håvard Skinnemoen <hskinnemoen@atmel.com> -Date: Thu Feb 2 15:48:50 2006 +0100 -Subject: [PATCH] Add flush_buffer() operation to uart_ops - -Serial drivers using DMA (like the Atmel USART3 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. - ---- - - Documentation/serial/driver | 11 +++++++++++ - drivers/serial/serial_core.c | 2 ++ - include/linux/serial_core.h | 1 + - 3 files changed, 14 insertions(+) - -Index: linux-2.6.16-avr32/Documentation/serial/driver -=================================================================== ---- linux-2.6.16-avr32.orig/Documentation/serial/driver 2006-03-20 06:53:29.000000000 +0100 -+++ linux-2.6.16-avr32/Documentation/serial/driver 2006-04-03 18:57:11.000000000 +0200 -@@ -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 -Index: linux-2.6.16-avr32/drivers/serial/serial_core.c -=================================================================== ---- linux-2.6.16-avr32.orig/drivers/serial/serial_core.c 2006-03-20 06:53:29.000000000 +0100 -+++ linux-2.6.16-avr32/drivers/serial/serial_core.c 2006-04-03 18:57:11.000000000 +0200 -@@ -556,6 +556,8 @@ static void uart_flush_buffer(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); - } -Index: linux-2.6.16-avr32/include/linux/serial_core.h -=================================================================== ---- linux-2.6.16-avr32.orig/include/linux/serial_core.h 2006-03-20 06:53:29.000000000 +0100 -+++ linux-2.6.16-avr32/include/linux/serial_core.h 2006-04-03 18:57:11.000000000 +0200 -@@ -164,6 +164,7 @@ 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 termios *new, - struct termios *old); - void (*pm)(struct uart_port *, unsigned int state, |