From: Marek Szyprowski m.szyprowski@samsung.com
[ Upstream commit 1ff3652bc7111df26b5807037f624be294cf69d5 ]
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 m.szyprowski@samsung.com Reviewed-by: Krzysztof Kozlowski krzk@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Sasha Levin sashal@kernel.org --- 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 c6058b52d5d59..2a49b6d876b87 100644 --- a/drivers/tty/serial/samsung.c +++ b/drivers/tty/serial/samsung.c @@ -1944,7 +1944,11 @@ 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); @@ -1967,7 +1971,11 @@ 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); } }