diff options
Diffstat (limited to 'drivers/tty/serial/8250/8250_omap.c')
| -rw-r--r-- | drivers/tty/serial/8250/8250_omap.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/drivers/tty/serial/8250/8250_omap.c b/drivers/tty/serial/8250/8250_omap.c index 57f6eba47f44..624b501fd253 100644 --- a/drivers/tty/serial/8250/8250_omap.c +++ b/drivers/tty/serial/8250/8250_omap.c @@ -114,6 +114,7 @@ struct omap8250_priv { struct uart_8250_dma omap8250_dma; spinlock_t rx_dma_lock; bool rx_dma_broken; + bool throttled; }; #ifdef CONFIG_SERIAL_8250_DMA @@ -692,6 +693,7 @@ static void omap_8250_shutdown(struct uart_port *port) static void omap_8250_throttle(struct uart_port *port) { + struct omap8250_priv *priv = port->private_data; struct uart_8250_port *up = up_to_u8250p(port); unsigned long flags; @@ -700,6 +702,7 @@ static void omap_8250_throttle(struct uart_port *port) spin_lock_irqsave(&port->lock, flags); up->ier &= ~(UART_IER_RLSI | UART_IER_RDI); serial_out(up, UART_IER, up->ier); + priv->throttled = true; spin_unlock_irqrestore(&port->lock, flags); pm_runtime_mark_last_busy(port->dev); @@ -738,12 +741,16 @@ static int omap_8250_rs485_config(struct uart_port *port, static void omap_8250_unthrottle(struct uart_port *port) { + struct omap8250_priv *priv = port->private_data; struct uart_8250_port *up = up_to_u8250p(port); unsigned long flags; pm_runtime_get_sync(port->dev); spin_lock_irqsave(&port->lock, flags); + priv->throttled = false; + if (up->dma) + up->dma->rx_dma(up); up->ier |= UART_IER_RLSI | UART_IER_RDI; serial_out(up, UART_IER, up->ier); spin_unlock_irqrestore(&port->lock, flags); @@ -788,6 +795,7 @@ unlock: static void __dma_rx_complete(void *param) { struct uart_8250_port *p = param; + struct omap8250_priv *priv = p->port.private_data; struct uart_8250_dma *dma = p->dma; struct dma_tx_state state; unsigned long flags; @@ -805,7 +813,8 @@ static void __dma_rx_complete(void *param) return; } __dma_rx_do_complete(p); - omap_8250_rx_dma(p); + if (!priv->throttled) + omap_8250_rx_dma(p); spin_unlock_irqrestore(&p->port.lock, flags); } |