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tty/serial: atmel: split tx and rx paths 

Split TX and RX paths to not schedule RX tasklet on TX events and vice versa.

Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Ludovic Desroches <ludovic.desroches@atmel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Nicolas Ferre 2016-06-17 12:05:47 +02:00 committed by Greg Kroah-Hartman
parent 9205218e49
commit 00e8e65870
1 changed files with 34 additions and 19 deletions
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53
drivers/tty/serial/atmel_serial.c
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@ -145,7 +145,8 @@ struct atmel_uart_port {
dma_cookie_t cookie_rx;
struct scatterlist sg_tx;
struct scatterlist sg_rx;
struct tasklet_struct tasklet;
struct tasklet_struct tasklet_rx;
struct tasklet_struct tasklet_tx;
unsigned int irq_status_prev;
unsigned int tx_len;
@ -708,7 +709,7 @@ static void atmel_rx_chars(struct uart_port *port)
status = atmel_uart_readl(port, ATMEL_US_CSR);
}
tasklet_schedule(&atmel_port->tasklet);
tasklet_schedule(&atmel_port->tasklet_rx);
}
/*
@ -779,7 +780,7 @@ static void atmel_complete_tx_dma(void *arg)
* remaining data from the beginning of xmit->buf to xmit->head.
*/
if (!uart_circ_empty(xmit))
tasklet_schedule(&atmel_port->tasklet);
tasklet_schedule(&atmel_port->tasklet_tx);
spin_unlock_irqrestore(&port->lock, flags);
}
@ -964,7 +965,7 @@ static void atmel_complete_rx_dma(void *arg)
struct uart_port *port = arg;
struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
tasklet_schedule(&atmel_port->tasklet);
tasklet_schedule(&atmel_port->tasklet_rx);
}
static void atmel_release_rx_dma(struct uart_port *port)
@ -1004,7 +1005,7 @@ static void atmel_rx_from_dma(struct uart_port *port)
if (dmastat == DMA_ERROR) {
dev_dbg(port->dev, "Get residue error, restart tasklet\n");
atmel_uart_writel(port, ATMEL_US_IER, ATMEL_US_TIMEOUT);
tasklet_schedule(&atmel_port->tasklet);
tasklet_schedule(&atmel_port->tasklet_rx);
return;
}
@ -1158,7 +1159,7 @@ static void atmel_uart_timer_callback(unsigned long data)
struct uart_port *port = (void *)data;
struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
tasklet_schedule(&atmel_port->tasklet);
tasklet_schedule(&atmel_port->tasklet_rx);
mod_timer(&atmel_port->uart_timer, jiffies + uart_poll_timeout(port));
}
@ -1181,7 +1182,7 @@ atmel_handle_receive(struct uart_port *port, unsigned int pending)
if (pending & (ATMEL_US_ENDRX | ATMEL_US_TIMEOUT)) {
atmel_uart_writel(port, ATMEL_US_IDR,
(ATMEL_US_ENDRX | ATMEL_US_TIMEOUT));
tasklet_schedule(&atmel_port->tasklet);
tasklet_schedule(&atmel_port->tasklet_rx);
}
if (pending & (ATMEL_US_RXBRK | ATMEL_US_OVRE |
@ -1193,7 +1194,7 @@ atmel_handle_receive(struct uart_port *port, unsigned int pending)
if (pending & ATMEL_US_TIMEOUT) {
atmel_uart_writel(port, ATMEL_US_IDR,
ATMEL_US_TIMEOUT);
tasklet_schedule(&atmel_port->tasklet);
tasklet_schedule(&atmel_port->tasklet_rx);
}
}
@ -1223,7 +1224,7 @@ atmel_handle_transmit(struct uart_port *port, unsigned int pending)
/* Either PDC or interrupt transmission */
atmel_uart_writel(port, ATMEL_US_IDR,
atmel_port->tx_done_mask);
tasklet_schedule(&atmel_port->tasklet);
tasklet_schedule(&atmel_port->tasklet_tx);
}
}
@ -1582,18 +1583,25 @@ static int atmel_prepare_rx_pdc(struct uart_port *port)
/*
* tasklet handling tty stuff outside the interrupt handler.
*/
static void atmel_tasklet_func(unsigned long data)
static void atmel_tasklet_rx_func(unsigned long data)
{
struct uart_port *port = (struct uart_port *)data;
struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
/* The interrupt handler does not take the lock */
spin_lock(&port->lock);
atmel_port->schedule_tx(port);
atmel_port->schedule_rx(port);
spin_unlock(&port->lock);
}
static void atmel_tasklet_tx_func(unsigned long data)
{
struct uart_port *port = (struct uart_port *)data;
struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
/* The interrupt handler does not take the lock */
spin_lock(&port->lock);
atmel_port->schedule_tx(port);
spin_unlock(&port->lock);
}
@ -1777,7 +1785,8 @@ static int atmel_startup(struct uart_port *port)
return retval;
}
tasklet_enable(&atmel_port->tasklet);
tasklet_enable(&atmel_port->tasklet_rx);
tasklet_enable(&atmel_port->tasklet_tx);
/*
* Initialize DMA (if necessary)
@ -1906,8 +1915,10 @@ static void atmel_shutdown(struct uart_port *port)
* Clear out any scheduled tasklets before
* we destroy the buffers
*/
tasklet_disable(&atmel_port->tasklet);
tasklet_kill(&atmel_port->tasklet);
tasklet_disable(&atmel_port->tasklet_rx);
tasklet_disable(&atmel_port->tasklet_tx);
tasklet_kill(&atmel_port->tasklet_rx);
tasklet_kill(&atmel_port->tasklet_tx);
/*
* Ensure everything is stopped and
@ -2302,9 +2313,12 @@ static int atmel_init_port(struct atmel_uart_port *atmel_port,
port->irq = pdev->resource[1].start;
port->rs485_config = atmel_config_rs485;
tasklet_init(&atmel_port->tasklet, atmel_tasklet_func,
tasklet_init(&atmel_port->tasklet_rx, atmel_tasklet_rx_func,
(unsigned long)port);
tasklet_disable(&atmel_port->tasklet);
tasklet_init(&atmel_port->tasklet_tx, atmel_tasklet_tx_func,
(unsigned long)port);
tasklet_disable(&atmel_port->tasklet_rx);
tasklet_disable(&atmel_port->tasklet_tx);
memset(&atmel_port->rx_ring, 0, sizeof(atmel_port->rx_ring));
@ -2786,7 +2800,8 @@ static int atmel_serial_remove(struct platform_device *pdev)
struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
int ret = 0;
tasklet_kill(&atmel_port->tasklet);
tasklet_kill(&atmel_port->tasklet_rx);
tasklet_kill(&atmel_port->tasklet_tx);
device_init_wakeup(&pdev->dev, 0);