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serial: sirf: provide pm entries of uart_ops 

this patch provides PM entry of uart_ops, then drop clk enable and
disable because serial core will do it.

the patch also fixes the issue that uart hang in resume caused by
not-enabled clock.

Signed-off-by: Qipan Li <Qipan.Li@csr.com>
Signed-off-by: Barry Song <Baohua.Song@csr.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Qipan Li 2014-01-03 15:44:07 +08:00 committed by Greg Kroah-Hartman
parent 99e626f504
commit 388faf9ffd
1 changed files with 11 additions and 3 deletions
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14
drivers/tty/serial/sirfsoc_uart.c
View File

@ -1033,6 +1033,16 @@ static void sirfsoc_uart_set_termios(struct uart_port *port,
spin_unlock_irqrestore(&port->lock, flags);
}
static void sirfsoc_uart_pm(struct uart_port *port, unsigned int state,
unsigned int oldstate)
{
struct sirfsoc_uart_port *sirfport = to_sirfport(port);
if (!state)
clk_prepare_enable(sirfport->clk);
else
clk_disable_unprepare(sirfport->clk);
}
static unsigned int sirfsoc_uart_init_tx_dma(struct uart_port *port)
{
struct sirfsoc_uart_port *sirfport = to_sirfport(port);
@ -1264,6 +1274,7 @@ static struct uart_ops sirfsoc_uart_ops = {
.startup = sirfsoc_uart_startup,
.shutdown = sirfsoc_uart_shutdown,
.set_termios = sirfsoc_uart_set_termios,
.pm = sirfsoc_uart_pm,
.type = sirfsoc_uart_type,
.release_port = sirfsoc_uart_release_port,
.request_port = sirfsoc_uart_request_port,
@ -1486,7 +1497,6 @@ static int sirfsoc_uart_probe(struct platform_device *pdev)
ret = PTR_ERR(sirfport->clk);
goto err;
}
clk_prepare_enable(sirfport->clk);
port->uartclk = clk_get_rate(sirfport->clk);
port->ops = &sirfsoc_uart_ops;
@ -1502,7 +1512,6 @@ static int sirfsoc_uart_probe(struct platform_device *pdev)
return 0;
port_err:
clk_disable_unprepare(sirfport->clk);
clk_put(sirfport->clk);
err:
return ret;
@ -1512,7 +1521,6 @@ static int sirfsoc_uart_remove(struct platform_device *pdev)
{
struct sirfsoc_uart_port *sirfport = platform_get_drvdata(pdev);
struct uart_port *port = &sirfport->port;
clk_disable_unprepare(sirfport->clk);
clk_put(sirfport->clk);
uart_remove_one_port(&sirfsoc_uart_drv, port);
return 0;