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[PATCH v3 3/4] serial: samsung: introduce s3c24xx_serial_rx_drain_fifo() function

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  [PATCH v3 3/4] serial: samsung: introduce  s3c24xx_serial_rx_drain_fifo() function Robert Baldyga <r.baldyga@samsung.com> - 2015-09-15 14:50 +0200
    Re: [PATCH v3 3/4] serial: samsung: introduce  s3c24xx_serial_rx_drain_fifo() function Krzysztof Kozlowski <k.kozlowski@samsung.com> - 2015-09-17 09:30 +0200
    Re: [PATCH v3 3/4] serial: samsung: introduce  s3c24xx_serial_rx_drain_fifo() function Krzysztof Kozlowski <k.kozlowski@samsung.com> - 2015-09-17 09:40 +0200

#1225045 — [PATCH v3 3/4] serial: samsung: introduce s3c24xx_serial_rx_drain_fifo() function

This patch introduces s3c24xx_serial_rx_drain_fifo() which reads data
from RX FIFO and writes it to tty buffer. It also checks for special
conditions (such as 'break') and handles it. This function has been
separated from s3c24xx_serial_rx_chars_pio() as it contains code which
can be used also in DMA mode.

Signed-off-by: Robert Baldyga <r.baldyga@samsung.com>
---
 drivers/tty/serial/samsung.c | 23 +++++++++++++----------
 1 file changed, 13 insertions(+), 10 deletions(-)

diff --git a/drivers/tty/serial/samsung.c b/drivers/tty/serial/samsung.c
index dc4be54..1d7dd86 100644
--- a/drivers/tty/serial/samsung.c
+++ b/drivers/tty/serial/samsung.c
@@ -621,16 +621,12 @@ finish:
 	return IRQ_HANDLED;
 }
 
-static irqreturn_t s3c24xx_serial_rx_chars_pio(void *dev_id)
+static void s3c24xx_serial_rx_drain_fifo(struct s3c24xx_uart_port *ourport)
 {
-	struct s3c24xx_uart_port *ourport = dev_id;
 	struct uart_port *port = &ourport->port;
 	unsigned int ufcon, ch, flag, ufstat, uerstat;
-	unsigned long flags;
 	int max_count = port->fifosize;
 
-	spin_lock_irqsave(&port->lock, flags);
-
 	while (max_count-- > 0) {
 		ufcon = rd_regl(port, S3C2410_UFCON);
 		ufstat = rd_regl(port, S3C2410_UFSTAT);
@@ -654,9 +650,7 @@ static irqreturn_t s3c24xx_serial_rx_chars_pio(void *dev_id)
 					ufcon |= S3C2410_UFCON_RESETRX;
 					wr_regl(port, S3C2410_UFCON, ufcon);
 					rx_enabled(port) = 1;
-					spin_unlock_irqrestore(&port->lock,
-							flags);
-					goto out;
+					return;
 				}
 				continue;
 			}
@@ -702,10 +696,19 @@ static irqreturn_t s3c24xx_serial_rx_chars_pio(void *dev_id)
 				 ch, flag);
 	}
 
-	spin_unlock_irqrestore(&port->lock, flags);
 	tty_flip_buffer_push(&port->state->port);
+}
+
+static irqreturn_t s3c24xx_serial_rx_chars_pio(void *dev_id)
+{
+	struct s3c24xx_uart_port *ourport = dev_id;
+	struct uart_port *port = &ourport->port;
+	unsigned long flags;
+
+	spin_lock_irqsave(&port->lock, flags);
+	s3c24xx_serial_rx_drain_fifo(ourport);
+	spin_unlock_irqrestore(&port->lock, flags);
 
-out:
 	return IRQ_HANDLED;
 }
 
-- 
1.9.1

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#1226712

On 15.09.2015 21:48, Robert Baldyga wrote:
> This patch introduces s3c24xx_serial_rx_drain_fifo() which reads data
> from RX FIFO and writes it to tty buffer. It also checks for special
> conditions (such as 'break') and handles it. This function has been
> separated from s3c24xx_serial_rx_chars_pio() as it contains code which
> can be used also in DMA mode.
> 
> Signed-off-by: Robert Baldyga <r.baldyga@samsung.com>
> ---
>  drivers/tty/serial/samsung.c | 23 +++++++++++++----------
>  1 file changed, 13 insertions(+), 10 deletions(-)
> 

Reviewed-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>

Best regards,
Krzysztof

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#1226714

On 15.09.2015 21:48, Robert Baldyga wrote:
> This patch introduces s3c24xx_serial_rx_drain_fifo() which reads data
> from RX FIFO and writes it to tty buffer. It also checks for special
> conditions (such as 'break') and handles it. This function has been
> separated from s3c24xx_serial_rx_chars_pio() as it contains code which
> can be used also in DMA mode.
> 
> Signed-off-by: Robert Baldyga <r.baldyga@samsung.com>
> ---
>  drivers/tty/serial/samsung.c | 23 +++++++++++++----------
>  1 file changed, 13 insertions(+), 10 deletions(-)

Thanks for splitting the code. It looks good but I don't feel
experienced enough in the driver internals to give a review tag. :)

Best regards,
Krzysztof

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