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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: Robert Baldyga <r.baldyga@samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Robert Baldyga 2014-11-24 07:56:21 +01:00 committed by Greg Kroah-Hartman
parent ddcbad9295
commit 1ff383a4c3
1 changed files with 4 additions and 0 deletions
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4
drivers/tty/serial/samsung.c
View File

@ -559,11 +559,15 @@ static void s3c24xx_serial_pm(struct uart_port *port, unsigned int level,
unsigned int old)
{
struct s3c24xx_uart_port *ourport = to_ourport(port);
int timeout = 10000;
ourport->pm_level = level;
switch (level) {
case 3:
while (--timeout && !s3c24xx_serial_txempty_nofifo(port))
udelay(100);
if (!IS_ERR(ourport->baudclk))
clk_disable_unprepare(ourport->baudclk);