lkml.org 
[lkml]   [2013]   [Dec]   [10]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRe: [PATCH] serial: samsung: move clock deactivation below uart registration
Date
Hi Heiko,

On Thursday 05 of December 2013 00:54:38 Heiko Stübner wrote:
> Commit 60e93575476f (serial: samsung: enable clock before clearing pending
> interrupts during init) added handling of the controller clock during init.
>
> On most systems this clock is also one of the baud_clock sources and
> possibly used by the earlycon and thus already enabled by the bootloader.
>
> Therefore a gap exists between s3c24xx_serial_init_port disabling the
> clock and an attached console reenabling it, making the transition from
> earlycon to regular console possibly hang the system - as seen on my
> S3C2442 based Freerunner today.
>
> Therefore move the disabling of the clock from s3c24xx_serial_init_port
> below the uart port registration, effectively creating an overlap and
> keeping the clock running non-stop if the console wants to grab this port.
>
> Signed-off-by: Heiko Stuebner <heiko@sntech.de>
> ---
> drivers/tty/serial/samsung.c | 8 +++++++-
> 1 file changed, 7 insertions(+), 1 deletion(-)

Makes sense.

Reviewed-by: Tomasz Figa <t.figa@samsung.com>

Best regards,
Tomasz

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2013-12-10 15:01    [W:0.053 / U:0.396 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site