linux-kernel - RE: [PATCH 8/8] ARM: S5PV210: example of CMA private area for FIMC device on Goni board

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Date:	Thu, 25 Aug 2011 09:22:18 +0200
From:	Marek Szyprowski <m.szyprowski@...sung.com>
To:	"'Aguirre, Sergio'" <saaguirre@...com>,
	'Kyungmin Park' <kyungmin.park@...sung.com>
Cc:	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-media@...r.kernel.org, linux-mm@...ck.org,
	linaro-mm-sig@...ts.linaro.org,
	'Michal Nazarewicz' <mina86@...a86.com>,
	'Russell King' <linux@....linux.org.uk>,
	'Andrew Morton' <akpm@...ux-foundation.org>
Subject: RE: [PATCH 8/8] ARM: S5PV210: example of CMA private area for FIMC
 device on Goni board

Hello,

On Wednesday, August 24, 2011 5:41 PM Aguirre, Sergio wrote:

> On Fri, Aug 19, 2011 at 04:27:44PM +0200, Marek Szyprowski wrote:
> > This patch is an example how device private CMA area can be activated.
> > It creates one CMA region and assigns it to the first s5p-fimc device on
> > Samsung Goni S5PC110 board.
> >
> > Signed-off-by: Marek Szyprowski <m.szyprowski@...sung.com>
> > Signed-off-by: Kyungmin Park <kyungmin.park@...sung.com>
> > ---
> >  arch/arm/mach-s5pv210/mach-goni.c |    4 ++++
> >  1 files changed, 4 insertions(+), 0 deletions(-)
> > diff --git a/arch/arm/mach-s5pv210/mach-goni.c b/arch/arm/mach-s5pv210/mach-
> goni.c
> > index 14578f5..f766c45 100644
> > --- a/arch/arm/mach-s5pv210/mach-goni.c
> > +++ b/arch/arm/mach-s5pv210/mach-goni.c
> > @@ -26,6 +26,7 @@
> >  #include <linux/input.h>
> >  #include <linux/gpio.h>
> >  #include <linux/interrupt.h>
> > +#include <linux/dma-contiguous.h>
> >
> >  #include <asm/mach/arch.h>
> >  #include <asm/mach/map.h>
> > @@ -857,6 +858,9 @@ static void __init goni_map_io(void)
> >  static void __init goni_reserve(void)
> >  {
> >  	s5p_mfc_reserve_mem(0x43000000, 8 << 20, 0x51000000, 8 << 20);
> > +
> > +	/* Create private 16MiB contiguous memory area for s5p-fimc.0 device */
> > +	dma_declare_contiguous(&s5p_device_fimc0.dev, 16*SZ_1M, 0);
> 
> This is broken, since according to patch #0006, dma_declare_contiguous
requires
> a 4th param (limit) which you're not providing here.

You are definitely right, there should be one more parameter. This patch was
just
cherry-picked from older version just before posting to mailing lists. I'm
really
sorry for this trivial bug.
 
Best regards
-- 
Marek Szyprowski
Samsung Poland R&D Center



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