From 1ff3652bc7111df26b5807037f624be294cf69d5 Mon Sep 17 00:00:00 2001 From: Marek Szyprowski Date: Thu, 13 Sep 2018 10:21:25 +0200 Subject: [PATCH] serial: samsung: Enable baud clock for UART reset procedure in resume Ensure that the baud clock is also enabled for UART register writes in driver resume. On Exynos5433 SoC this is needed to avoid external abort issue. Signed-off-by: Marek Szyprowski Reviewed-by: Krzysztof Kozlowski Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/samsung.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/tty/serial/samsung.c b/drivers/tty/serial/samsung.c index 2f8fa184aafa..da1bd4bba8a9 100644 --- a/drivers/tty/serial/samsung.c +++ b/drivers/tty/serial/samsung.c @@ -1941,7 +1941,11 @@ 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); @@ -1964,7 +1968,11 @@ 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); } } -- 2.11.0