linux-kernel - Re: [PATCH] serial: DCC(JTAG) serial and console emulation support

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Date:	Fri, 08 Oct 2010 22:40:27 +0200
From:	matthieu castet <castet.matthieu@...e.fr>
To:	Daniel Walker <dwalker@...eaurora.org>
CC:	Linux Kernel list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] serial: DCC(JTAG) serial and console emulation support

Daniel Walker a écrit :
> On Fri, 2010-10-08 at 21:34 +0200, matthieu castet wrote:
>> Hi,
>>
>> for the record I attach a modified version of the original samsung one that I did.
>>
>> I improved a bit the reactivity, and did some hack to make polling in idle loop.
>> With recent kernel this should be done in a thread with SCHED_IDLE policy.
>>
>> I also supported board with irq for rx and tx (not sure if the original driver supported it).
> 
> Do you use the CONFIG_SERIAL_DCC_STDSERIAL feature?
> 
No, I never used it

Matthieu

PS : I attached a diff against the original version. Looking at it, I think the really interesting stuff is
the dcc_idle that should called in a thread with low priority. The reactivity of the workqueue was very bad IIRC.

Irq stuff is only supported by few cpu, so I am not sure it worth to merge it.

View attachment "diff" of type "text/plain" (13429 bytes)