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authorQipan Li <Qipan.Li@csr.com>2014-01-03 15:44:07 +0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-01-07 17:09:04 -0800
commit388faf9ffdaf92c81243514a2dd4c6ce04d28874 (patch)
tree30369709d7115a7d53663a66a25674e06ce032f8 /drivers/tty
parent99e626f50477e3b14c9be43892c33ab75b2e5bf9 (diff)
downloadlinux-388faf9ffdaf92c81243514a2dd4c6ce04d28874.tar.bz2
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>
Diffstat (limited to 'drivers/tty')
-rw-r--r--drivers/tty/serial/sirfsoc_uart.c14
1 files changed, 11 insertions, 3 deletions
diff --git a/drivers/tty/serial/sirfsoc_uart.c b/drivers/tty/serial/sirfsoc_uart.c
index 6fea79b96bb9..a6c38ab1eeb2 100644
--- a/drivers/tty/serial/sirfsoc_uart.c
+++ b/drivers/tty/serial/sirfsoc_uart.c
@@ -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 @@ usp_no_flow_control:
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 @@ usp_no_flow_control:
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;