Commit 1ff383a4 authored by Robert Baldyga's avatar Robert Baldyga Committed by Greg Kroah-Hartman

serial: samsung: wait for transfer completion before clock disable

This patch adds waiting until transmit buffer and shifter will be empty
before clock disabling.

Without this fix it's possible to have clock disabled while data was
not transmited yet, which causes unproper state of TX line and problems
in following data transfers.

Cc: <stable@vger.kernel.org> # v2.6.26+
Signed-off-by: default avatarRobert Baldyga <r.baldyga@samsung.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent ddcbad92
...@@ -559,11 +559,15 @@ static void s3c24xx_serial_pm(struct uart_port *port, unsigned int level, ...@@ -559,11 +559,15 @@ static void s3c24xx_serial_pm(struct uart_port *port, unsigned int level,
unsigned int old) unsigned int old)
{ {
struct s3c24xx_uart_port *ourport = to_ourport(port); struct s3c24xx_uart_port *ourport = to_ourport(port);
int timeout = 10000;
ourport->pm_level = level; ourport->pm_level = level;
switch (level) { switch (level) {
case 3: case 3:
while (--timeout && !s3c24xx_serial_txempty_nofifo(port))
udelay(100);
if (!IS_ERR(ourport->baudclk)) if (!IS_ERR(ourport->baudclk))
clk_disable_unprepare(ourport->baudclk); clk_disable_unprepare(ourport->baudclk);
......
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