[PATCH v3] tty: serial: msm_serial: code cleanup in msm_console_setup

[PATCH v3] tty: serial: msm_serial: code cleanup in msm_console_setup

[Pramod Gurav]

The change does following:
 - baud, flow, bits, parity were being overwritten as they were
   being reinitialized after parsing.  Initialize them when they are
   declared so that user provided setting are not overwritten.
 - msm_set_baud_rate() is anyway called in uart_set_options when it calls
   msm_set_termios(). msm_reset() is called when we change the baud rate.
   Hence doing away with both of these calls.
 - CR_CMD_PROTECTION_EN and CR_TX_ENABLE settings are done in msm_set_baud_rate.
   So do away with this here.

Signed-off-by: Pramod Gurav <pramod.gurav@smartplayin.com>
---

Changes since v2:
 - initialize baud, flow, bits, parity when they are declared.
 - undo msm_init_clock removal as suggested by Stephen.
 - Remove unused variable msm_port

Tested on IFC6410.

 drivers/tty/serial/msm_serial.c |   24 ++++--------------------
 1 file changed, 4 insertions(+), 20 deletions(-)

diff --git a/drivers/tty/serial/msm_serial.c b/drivers/tty/serial/msm_serial.c
index c88b522..a0cc6e0 100644
--- a/drivers/tty/serial/msm_serial.c
+++ b/drivers/tty/serial/msm_serial.c
@@ -920,14 +920,15 @@ static void msm_console_write(struct console *co, const char *s,
 static int __init msm_console_setup(struct console *co, char *options)
 {
 	struct uart_port *port;
-	struct msm_port *msm_port;
-	int baud = 0, flow, bits, parity;
+	int baud = 115200;
+	int bits = 8;
+	int parity = 'n';
+	int flow = 'n';
 
 	if (unlikely(co->index >= UART_NR || co->index < 0))
 		return -ENXIO;
 
 	port = get_port_from_line(co->index);
-	msm_port = UART_TO_MSM(port);
 
 	if (unlikely(!port->membase))
 		return -ENXIO;
@@ -937,23 +938,6 @@ static int __init msm_console_setup(struct console *co, char *options)
 	if (options)
 		uart_parse_options(options, &baud, &parity, &bits, &flow);
 
-	bits = 8;
-	parity = 'n';
-	flow = 'n';
-	msm_write(port, UART_MR2_BITS_PER_CHAR_8 | UART_MR2_STOP_BIT_LEN_ONE,
-		  UART_MR2);	/* 8N1 */
-
-	if (baud < 300 || baud > 115200)
-		baud = 115200;
-	msm_set_baud_rate(port, baud);
-
-	msm_reset(port);
-
-	if (msm_port->is_uartdm) {
-		msm_write(port, UART_CR_CMD_PROTECTION_EN, UART_CR);
-		msm_write(port, UART_CR_TX_ENABLE, UART_CR);
-	}
-
 	pr_info("msm_serial: console setup on port #%d\n", port->line);
 
 	return uart_set_options(port, co, baud, parity, bits, flow);
-- 
1.7.9.5

Re: [PATCH v3] tty: serial: msm_serial: code cleanup in msm_console_setup

[Stephen Boyd]

On 01/12/2015 05:45 AM, Pramod Gurav wrote:
> The change does following:
>  - baud, flow, bits, parity were being overwritten as they were
>    being reinitialized after parsing.  Initialize them when they are
>    declared so that user provided setting are not overwritten.
>  - msm_set_baud_rate() is anyway called in uart_set_options when it calls
>    msm_set_termios(). msm_reset() is called when we change the baud rate.
>    Hence doing away with both of these calls.
>  - CR_CMD_PROTECTION_EN and CR_TX_ENABLE settings are done in msm_set_baud_rate.
>    So do away with this here.
>
> Signed-off-by: Pramod Gurav <pramod.gurav@smartplayin.com>
>

Reviewed-by: Stephen Boyd <sboyd@codeaurora.org>

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