The omap needs a DMA request pending right away. If it is enqueued once
the bytes are in the FIFO then nothing will happen and the FIFO will be
later purged via RX-timeout interrupt.
This patch enqueues RX-DMA request on completion but not if it was
aborted on error. The first enqueue will happen in the driver in
startup.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
---
drivers/tty/serial/8250/8250_core.c | 3 +++
drivers/tty/serial/8250/8250_dma.c | 12 +++++++++---
2 files changed, 12 insertions(+), 3 deletions(-)
diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c
index 7498ce1..ab2de27 100644
--- a/drivers/tty/serial/8250/8250_core.c
+++ b/drivers/tty/serial/8250/8250_core.c
@@ -1598,6 +1598,9 @@ int serial8250_handle_irq(struct uart_port *port, unsigned int iir)
if (!up->dma || dma_err)
status = serial8250_rx_chars(up, status);
+
+ if (dma_err && port->type == PORT_OMAP_16750)
+ serial8250_rx_dma(up, 0);
}
serial8250_modem_status(up);
if ((!up->dma || up->dma_tx_err) && (status & UART_LSR_THRE))
diff --git a/drivers/tty/serial/8250/8250_dma.c b/drivers/tty/serial/8250/8250_dma.c
index 5c59b15..7417ed5 100644
--- a/drivers/tty/serial/8250/8250_dma.c
+++ b/drivers/tty/serial/8250/8250_dma.c
@@ -50,9 +50,8 @@ static void __dma_tx_complete(void *param)
spin_unlock_irqrestore(&p->port.lock, flags);
}
-static void __dma_rx_complete(void *param)
+static void __dma_rx_do_complete(struct uart_8250_port *p, bool error)
{
- struct uart_8250_port *p = param;
struct uart_8250_dma *dma = p->dma;
struct tty_port *tty_port = &p->port.state->port;
struct dma_tx_state state;
@@ -68,10 +67,17 @@ static void __dma_rx_complete(void *param)
tty_insert_flip_string(tty_port, dma->rx_buf, count);
p->port.icount.rx += count;
+ if (!error && p->port.type == PORT_OMAP_16750)
+ serial8250_rx_dma(p, 0);
tty_flip_buffer_push(tty_port);
}
+static void __dma_rx_complete(void *param)
+{
+ __dma_rx_do_complete(param, false);
+}
+
int serial8250_tx_dma(struct uart_8250_port *p)
{
struct uart_8250_dma *dma = p->dma;
@@ -139,7 +145,7 @@ int serial8250_rx_dma(struct uart_8250_port *p, unsigned int iir)
*/
if (dma_status == DMA_IN_PROGRESS) {
dmaengine_pause(dma->rxchan);
- __dma_rx_complete(p);
+ __dma_rx_do_complete(p, true);
}
return -ETIMEDOUT;
default:
--
2.0.1
--
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