linux-kernel - Re: [PATCH] serial: sh-sci: don't filter on DMA device, use only channel ID

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Date:	Mon, 29 Aug 2011 17:16:03 +0900
From:	Magnus Damm <magnus.damm@...il.com>
To:	Paul Mundt <lethal@...ux-sh.org>
Cc:	"Koul, Vinod" <vinod.koul@...el.com>,
	Guennadi Liakhovetski <g.liakhovetski@....de>,
	linux-sh@...r.kernel.org, linux-kernel@...r.kernel.org,
	Dan Williams <dan.j.williams@...el.com>,
	Magnus Damm <damm@...nsource.se>
Subject: Re: [PATCH] serial: sh-sci: don't filter on DMA device, use only
 channel ID

On Mon, Aug 29, 2011 at 5:00 PM, Paul Mundt <lethal@...ux-sh.org> wrote:
> On Fri, Jun 24, 2011 at 05:17:51PM +0530, Koul, Vinod wrote:
>> On Fri, 2011-06-24 at 13:56 +0200, Guennadi Liakhovetski wrote:
>> > On some sh-mobile systems there are more than one DMA controllers, that
>> > can be used for serial ports. Specifying a DMA device in sh-sci platform
>> > data unnecessarily restricts the driver to only use one DMA controller.
>> >
>> > Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@....de>
>> > ---
>> >  drivers/tty/serial/sh-sci.c |   25 ++++++++-----------------
>> >  include/linux/serial_sci.h  |    2 --
>> >  2 files changed, 8 insertions(+), 19 deletions(-)
>> >
>> > diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c
>> > index ebd8629..8711f4e 100644
>> > --- a/drivers/tty/serial/sh-sci.c
>> > +++ b/drivers/tty/serial/sh-sci.c
>> > @@ -1295,12 +1295,8 @@ static bool filter(struct dma_chan *chan, void *slave)
>> >     dev_dbg(chan->device->dev, "%s: slave ID %d\n", __func__,
>> >             param->slave_id);
>> >
>> > -   if (param->dma_dev == chan->device->dev) {
>> > -           chan->private = param;
>> > -           return true;
>> > -   } else {
>> > -           return false;
>> > -   }
>> > +   chan->private = param;
>> > +   return true;
>> You should not assign chan->private.
>> Please move this  to dma_slave_control API
>
> I haven't seen any reply to this comment and this patch seems to still be
> outstanding, is there an updated version of this patch that I've missed?

This patch is simply making the SCIF driver behave as other drivers
that support DMA Engine like for instance:
MMCIF - drivers/mmc/host/sh_mmcif.c
SDHI - drivers/mmc/host/tmio_mmc_dma.c
USBHS - drivers/usb/renesas_usbhs/fifo.c

The SIU driver is still acting like the SCIF driver though:
SIU - sound/soc/sh/siu_pcm.c

If possible I would prefer if the drivers for the SCIF and the SIU
first could be cleaned up to behave like MMCIF/SDHI/USBHS and then we
can move to make use of the dma_slave_control API after that.

Any thoughs?

Thanks,

/ magnus
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