linux-kernel - Re: Serieal console on Samsung S3C6410 ARM11 CPU (Was [ANNOUNCE] 3.0.6-rt17)

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Message-ID: <CAJuYYwSEvA+EHwyhgeZkBX+bB_e1cmFnC6YdEx-CdHzk8peyEw@mail.gmail.com>
Date:	Sat, 8 Oct 2011 18:59:18 +0530
From:	Thomas Abraham <thomas.abraham@...aro.org>
To:	Juergen Beisert <jbe@...gutronix.de>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-rt-users <linux-rt-users@...r.kernel.org>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: Serieal console on Samsung S3C6410 ARM11 CPU (Was [ANNOUNCE] 3.0.6-rt17)

Hi Juergen,

On 8 October 2011 16:56, Juergen Beisert <jbe@...gutronix.de> wrote:
> Thomas Gleixner wrote:
>> I'm pleased to announce the 3.0.6-rt17 release.
>
> I have no idea where to search, but when I'm using the 3.0.6-rt17 on my
> Samsung S3C6410 ARM based system, the UART (serial console) does not work as
> expected. Typing only one char at a time is okay. Typing two chars
> immediately makes the system using 100 % CPU load and takes about 2 seconds
> to respond. It seems the interrupt handling is broken in the UART driver, but
> I don't know how to fix it.
>
> This with a simple cursor up (one char to get the last command) and a small
> pause to the next "ENTER" char:
>
> root@...i6410:~ cat /proc/interrupts | grep 18:
>  18:    5739107  s3c-uart  s3c6400-uart
>
> Same again:
>
> root@...i6410:~ cat /proc/interrupts | grep 18:
>  18:    5739113  s3c-uart  s3c6400-uart
>
> 6 interrupts seems reasonable.
>
> Now with cursor up and SPACE immediately, then a pause for ENTER:
>
> root@...i6410:~ cat /proc/interrupts | grep 18:
>  18:    5923815  s3c-uart  s3c6400-uart
>
> 184702 interrupts looks strange.

Just curious, do you have the following two commits?

serial: samsung: Add unified interrupt handler for s3c64xx and later SoC's
ARM: SAMSUNG: Remove uart irq handling from platform code

Thanks,
Thomas.
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