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| author |   Robert Baldyga <r.baldyga@samsung.com> | 2014-11-24 07:56:21 +0100 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-11-25 17:06:39 -0800 |
| commit | 1ff383a4c3eda8893ec61b02831826e1b1f46b41 (patch) | |
| tree | 23f46feb7762af806935622ca0a4064d1ebef14a /drivers/tty/serial/samsung.c | |
| parent | serial: icom: fix error return code (diff) | |
| download | linux-dev-1ff383a4c3eda8893ec61b02831826e1b1f46b41.tar.xz linux-dev-1ff383a4c3eda8893ec61b02831826e1b1f46b41.zip | |
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>
Diffstat (limited to 'drivers/tty/serial/samsung.c')
| -rw-r--r-- | drivers/tty/serial/samsung.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/tty/serial/samsung.c b/drivers/tty/serial/samsung.c index 796c04c77dc1..d36b2bd39e30 100644 --- a/drivers/tty/serial/samsung.c +++ b/drivers/tty/serial/samsung.c @@ -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); |