serial: samsung: Enable baud clock for UART reset procedure in resume

Ensure that baud clock is also enabled for UART reset in driver resume.
On Exynos5433 SoC this is needed to avoid external abort in UART register
writes.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Change-Id: I2987842ea1b38582bdbceb9ffab3ed1a3b1cbfd2

diff --git a/drivers/tty/serial/samsung.c b/drivers/tty/serial/samsung.c
index 1b454cb..a4c3e27 100644 (file)
--- a/drivers/tty/serial/samsung.c
+++ b/drivers/tty/serial/samsung.c
@@ -1922,7 +1922,11 @@ static int s3c24xx_serial_resume(struct device *dev)
 
        if (port) {
                clk_prepare_enable(ourport->clk);
+               if (!IS_ERR(ourport->baudclk))
+                       clk_prepare_enable(ourport->baudclk);
                s3c24xx_serial_resetport(port, s3c24xx_port_to_cfg(port));
+               if (!IS_ERR(ourport->baudclk))
+                       clk_disable_unprepare(ourport->baudclk);
                clk_disable_unprepare(ourport->clk);
 
                uart_resume_port(&s3c24xx_uart_drv, port);
@@ -1945,7 +1949,11 @@ static int s3c24xx_serial_resume_noirq(struct device *dev)
                        if (rx_enabled(port))
                                uintm &= ~S3C64XX_UINTM_RXD_MSK;
                        clk_prepare_enable(ourport->clk);
+                       if (!IS_ERR(ourport->baudclk))
+                               clk_prepare_enable(ourport->baudclk);
                        wr_regl(port, S3C64XX_UINTM, uintm);
+                       if (!IS_ERR(ourport->baudclk))
+                               clk_disable_unprepare(ourport->baudclk);
                        clk_disable_unprepare(ourport->clk);
                }
        }