| Message ID | 20180913082125.11849-1-m.szyprowski@samsung.com |
|---|---|
| State | New |
| Headers | show |
| Series | serial: samsung: Enable baud clock for UART reset procedure in resume | expand |
On Thu, 13 Sep 2018 at 10:21, Marek Szyprowski <m.szyprowski@samsung.com> wrote: > > 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> > --- > drivers/tty/serial/samsung.c | 8 ++++++++ > 1 file changed, 8 insertions(+) > Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org> Best regards, Krzysztof
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); } }
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> --- drivers/tty/serial/samsung.c | 8 ++++++++ 1 file changed, 8 insertions(+) -- 2.17.1