Hi Robert,
I send following patch to fix the broken serial log of Exynos SoC.
As I knew, you also knew this issue.
If possible, could you review or test this patch?
Best Regards,
Chanwoo Choi
On 2016년 03월 14일 09:41, Chanwoo Choi wrote:
> This patch fixes the broken serial log when changing the clock source
> of uart device. Before disabling the original clock source, this patch
> enables the new clock source to protect the clock off state for a split second.
>
> Signed-off-by: Chanwoo Choi <cw00.choi@xxxxxxxxxxx>
> ---
> drivers/tty/serial/samsung.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/tty/serial/samsung.c b/drivers/tty/serial/samsung.c
> index d72cd736bdc6..80d59dbfebba 100644
> --- a/drivers/tty/serial/samsung.c
> +++ b/drivers/tty/serial/samsung.c
> @@ -1265,13 +1265,13 @@ static void s3c24xx_serial_set_termios(struct uart_port *port,
> if (ourport->baudclk != clk) {
> s3c24xx_serial_setsource(port, clk_sel);
>
> + clk_prepare_enable(clk);
> +
> if (!IS_ERR(ourport->baudclk)) {
> clk_disable_unprepare(ourport->baudclk);
> ourport->baudclk = ERR_PTR(-EINVAL);
> }
>
> - clk_prepare_enable(clk);
> -
> ourport->baudclk = clk;
> ourport->baudclk_rate = clk ? clk_get_rate(clk) : 0;
> }
>
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