linux-kernel - Re: [PATCH 5/5] atmel

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Message-ID: <alpine.LFD.0.9999.0712181317070.27475@localhost.localdomain>
Date:	Tue, 18 Dec 2007 13:18:04 -0500 (EST)
From:	Chip Coldwell <coldwell@...nk.harvard.edu>
To:	Haavard Skinnemoen <hskinnemoen@...el.com>
cc:	Andrew Victor <linux@...im.org.za>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	kernel@...32linux.org, linux-kernel@...r.kernel.org,
	Remy Bohmer <linux@...mer.net>,
	ARM Linux Mailing List 
	<linux-arm-kernel@...ts.arm.linux.org.uk>
Subject: Re: [PATCH 5/5] atmel_serial: Add DMA support

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On Tue, 18 Dec 2007, Haavard Skinnemoen wrote:

> From: Chip Coldwell <hskinnemoen@...el.com>
> 
> This patch is based on the DMA-patch by Chip Coldwell for the
> AT91/AT32 serial USARTS, with some tweaks to make it apply neatly on
> top of the other patches in this series.
> 
> The RX code has been moved to a tasklet and reworked a bit. Instead of
> depending on the ENDRX and TIMEOUT bits in CSR, we simply grab as much
> data as we can from the DMA buffers. I think this closes a race where
> the ENDRX bit is set after we read CSR but before we read RPR,
> although I haven't confirmed this.
> 
> This also fixes a DMA sync bug in the original patch.
> 
> [linux@...mer.net: rebased onto irq-splitup patch]
> [hskinnemoen@...el.com: moved to tasklet, fixed dma bug, misc cleanups]
> Signed-off-by: Remy Bohmer <linux@...mer.net>
> Signed-off-by: Haavard Skinnemoen <hskinnemoen@...el.com>
> ---
>  drivers/serial/atmel_serial.c |  386 ++++++++++++++++++++++++++++++++++++++--
>  1 files changed, 366 insertions(+), 20 deletions(-)
> 
> diff --git a/drivers/serial/atmel_serial.c b/drivers/serial/atmel_serial.c
> index 990d3ab..07c2734 100644
> --- a/drivers/serial/atmel_serial.c
> +++ b/drivers/serial/atmel_serial.c
> @@ -7,6 +7,8 @@
>   *  Based on drivers/char/serial_sa1100.c, by Deep Blue Solutions Ltd.
>   *  Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o.
>   *
> + *  DMA support added by Chip Coldwell.

I will ACK/Sign-off on this soon; I just want to do some tests on real
hardware first.

Chip

- -- 
Charles M. Coldwell
"Turn on, log in, tune out"
Somerville, Massachusetts, New England
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