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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 <m.szyprowski@samsung.com>
Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Marek Szyprowski 2018-09-13 10:21:25 +02:00 committed by Greg Kroah-Hartman
parent 3d8b43ad9c
commit 1ff3652bc7
1 changed files with 8 additions and 0 deletions
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8
drivers/tty/serial/samsung.c
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@ -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);
}
}