linux-kernel - Re: [PATCH] Powerpc 8xx CPM

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Message-ID: <20120816152918.5ed2649f@pyramind.ukuu.org.uk>
Date:	Thu, 16 Aug 2012 15:29:18 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	leroy christophe <christophe.leroy@....fr>
Cc:	Alan Cox <alan@...ux.intel.com>,
	Vitaly Bordug <vitb@...nel.crashing.org>,
	Marcelo Tosatti <marcelo@...ck.org>,
	linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH] Powerpc 8xx CPM_UART delay in receive

> The PowerPC CPM is working differently. It doesn't use a fifo but 
> buffers. Buffers are handed to the microprocessor only when they are 
> full or after a timeout period which is adjustable. In the driver, the 

Which is different how - remembering we empty the FIFO on an IRQ

> buffers are configured with a size of 32 bytes. And the timeout is set 
> to the size of the buffer. That is this timeout that I'm reducing to 1 
> byte in my proposed patch. I can't see what it would break for high 
> speed I/O.

How can a timeout be measured in "bytes". Can we have a bit more clarity
on how the hardware works and take it from there ?

Alan
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