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serial: imx: remove the uart_console() check 

The uart_console() check makes the clocks(clk_per and clk_ipg) opened
even when we close the console uart.

This patch enable/disable the clocks in imx_console_write(),
so we can keep the clocks closed when the console uart is closed.

Also remove the clock enable/disable oprations in the probe, we do not
need them any more.

Signed-off-by: Huang Shijie <b32955@freescale.com>
Acked-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Huang Shijie 2013-06-28 13:39:42 +08:00 committed by Greg Kroah-Hartman
parent 43b829b3c1
commit 1cf93e0d54
1 changed files with 43 additions and 26 deletions
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69
drivers/tty/serial/imx.c
View File

@ -701,15 +701,13 @@ static int imx_startup(struct uart_port *port)
int retval;
unsigned long flags, temp;
if (!uart_console(port)) {
retval = clk_prepare_enable(sport->clk_per);
if (retval)
goto error_out1;
retval = clk_prepare_enable(sport->clk_ipg);
if (retval) {
clk_disable_unprepare(sport->clk_per);
goto error_out1;
}
retval = clk_prepare_enable(sport->clk_per);
if (retval)
goto error_out1;
retval = clk_prepare_enable(sport->clk_ipg);
if (retval) {
clk_disable_unprepare(sport->clk_per);
goto error_out1;
}
imx_setup_ufcr(sport, 0);
@ -900,10 +898,8 @@ static void imx_shutdown(struct uart_port *port)
writel(temp, sport->port.membase + UCR1);
spin_unlock_irqrestore(&sport->port.lock, flags);
if (!uart_console(&sport->port)) {
clk_disable_unprepare(sport->clk_per);
clk_disable_unprepare(sport->clk_ipg);
}
clk_disable_unprepare(sport->clk_per);
clk_disable_unprepare(sport->clk_ipg);
}
static void
@ -1250,6 +1246,16 @@ imx_console_write(struct console *co, const char *s, unsigned int count)
unsigned int ucr1;
unsigned long flags = 0;
int locked = 1;
int retval;
retval = clk_enable(sport->clk_per);
if (retval)
return;
retval = clk_enable(sport->clk_ipg);
if (retval) {
clk_disable(sport->clk_per);
return;
}
if (sport->port.sysrq)
locked = 0;
@ -1285,6 +1291,9 @@ imx_console_write(struct console *co, const char *s, unsigned int count)
if (locked)
spin_unlock_irqrestore(&sport->port.lock, flags);
clk_disable(sport->clk_ipg);
clk_disable(sport->clk_per);
}
/*
@ -1358,6 +1367,7 @@ imx_console_setup(struct console *co, char *options)
int bits = 8;
int parity = 'n';
int flow = 'n';
int retval;
/*
* Check whether an invalid uart number has been specified, and
@ -1370,6 +1380,11 @@ imx_console_setup(struct console *co, char *options)
if (sport == NULL)
return -ENODEV;
/* For setting the registers, we only need to enable the ipg clock. */
retval = clk_prepare_enable(sport->clk_ipg);
if (retval)
goto error_console;
if (options)
uart_parse_options(options, &baud, &parity, &bits, &flow);
else
@ -1377,7 +1392,20 @@ imx_console_setup(struct console *co, char *options)
imx_setup_ufcr(sport, 0);
return uart_set_options(&sport->port, co, baud, parity, bits, flow);
retval = uart_set_options(&sport->port, co, baud, parity, bits, flow);
clk_disable(sport->clk_ipg);
if (retval) {
clk_unprepare(sport->clk_ipg);
goto error_console;
}
retval = clk_prepare(sport->clk_per);
if (retval)
clk_disable_unprepare(sport->clk_ipg);
error_console:
return retval;
}
static struct uart_driver imx_reg;
@ -1555,9 +1583,6 @@ static int serial_imx_probe(struct platform_device *pdev)
return ret;
}
clk_prepare_enable(sport->clk_per);
clk_prepare_enable(sport->clk_ipg);
sport->port.uartclk = clk_get_rate(sport->clk_per);
imx_ports[sport->port.line] = sport;
@ -1566,7 +1591,7 @@ static int serial_imx_probe(struct platform_device *pdev)
if (pdata && pdata->init) {
ret = pdata->init(pdev);
if (ret)
goto clkput;
return ret;
}
ret = uart_add_one_port(&imx_reg, &sport->port);
@ -1574,18 +1599,10 @@ static int serial_imx_probe(struct platform_device *pdev)
goto deinit;
platform_set_drvdata(pdev, sport);
if (!uart_console(&sport->port)) {
clk_disable_unprepare(sport->clk_per);
clk_disable_unprepare(sport->clk_ipg);
}
return 0;
deinit:
if (pdata && pdata->exit)
pdata->exit(pdev);
clkput:
clk_disable_unprepare(sport->clk_per);
clk_disable_unprepare(sport->clk_ipg);
return ret;
}