linux-kernel - RE: [PATCH v2] ARM: PL011: Add support for Rx DMA buffer polling

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Message-ID: <CAOAMb1AsetjcNa_K6g=6K_s=0+tTH1aGLuX8emYrfgJOcx54cw@mail.gmail.com>
Date:	Mon, 28 Jan 2013 17:15:23 +0900
From:	Chanho Min <chanho.min@....com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	Linus Walleij <linus.walleij@...aro.org>,
	Alan Cox <alan@...ux.intel.com>, linux-kernel@...r.kernel.org,
	Pawel Moll <pawel.moll@....com>, linux-serial@...r.kernel.org,
	Chanho Min <chanho0207@...il.com>
Subject: RE: [PATCH v2] ARM: PL011: Add support for Rx DMA buffer polling

>Well, I thought I had explained that I'd prefer to see the poll rate
>adjusted with the baud rate, but maybe I wasn't explicit enough.
>Instead, what we seem to have ended up with are two new entries in
>platform data (which we're trying to get away from with DT):
>
>+       unsigned int dma_rx_poll_rate;
>+       unsigned int dma_rx_poll_timeout;
>
>If this were to be done, then receive DMA could be used on the Versatile
>PB platforms without having it suck CPU usage unnecessarily at slower
>baud rates.
This patch is working well on our pl011+ pl080 platform.
If no data is received during time-out, no tick timer works.
Do you want to adjust the poll rate with the baud rate additionally?
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