linux-kernel - Re: [PATCH v6 3/4] media: coda: use genalloc API

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Date:	Fri, 16 Nov 2012 16:21:13 +0100
From:	Philipp Zabel <p.zabel@...gutronix.de>
To:	Paul Gortmaker <paul.gortmaker@...driver.com>
Cc:	linux-kernel@...r.kernel.org, Arnd Bergmann <arnd@...db.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Grant Likely <grant.likely@...retlab.ca>,
	Rob Herring <rob.herring@...xeda.com>,
	Shawn Guo <shawn.guo@...aro.org>,
	Richard Zhao <richard.zhao@...escale.com>,
	Huang Shijie <shijie8@...il.com>,
	Dong Aisheng <dong.aisheng@...aro.org>,
	Matt Porter <mporter@...com>,
	Fabio Estevam <fabio.estevam@...escale.com>,
	Javier Martin <javier.martin@...ta-silicon.com>,
	kernel@...gutronix.de, devicetree-discuss@...ts.ozlabs.org
Subject: Re: [PATCH v6 3/4] media: coda: use genalloc API

Am Freitag, den 16.11.2012, 10:08 -0500 schrieb Paul Gortmaker:
> On 12-11-16 05:30 AM, Philipp Zabel wrote:
> > This patch depends on "genalloc: add a global pool list,
> > allow to find pools by phys address", which provides the
> > of_get_named_gen_pool function.
> > 
> > Signed-off-by: Philipp Zabel <p.zabel@...gutronix.de>
> > ---
> >  drivers/media/platform/Kconfig |    3 +--
> >  drivers/media/platform/coda.c  |   47 ++++++++++++++++++++++++++++------------
> >  2 files changed, 34 insertions(+), 16 deletions(-)
> > 
> > diff --git a/drivers/media/platform/Kconfig b/drivers/media/platform/Kconfig
> > index 181c768..09d45c6 100644
> > --- a/drivers/media/platform/Kconfig
> > +++ b/drivers/media/platform/Kconfig
> > @@ -130,10 +130,9 @@ if V4L_MEM2MEM_DRIVERS
> >  
> >  config VIDEO_CODA
> >  	tristate "Chips&Media Coda multi-standard codec IP"
> > -	depends on VIDEO_DEV && VIDEO_V4L2 && ARCH_MXC
> > +	depends on VIDEO_DEV && VIDEO_V4L2
> 
> What was the logic for reducing the dependency scope here?
> Your commit log doesn't mention that at all, and when I see
> things like that, I predict allyesconfig build failures,
> unless there is a similar dependency elsewhere that isn't
> visible in just the context of this patch alone.
> 
> P.

iram_alloc and iram_free are i.MX specific wrappers around
gen_pool_alloc and gen_pool_free, located in <mach/iram.h>.
Those were responsible for the dependency in the first place.

> --
> 
> >  	select VIDEOBUF2_DMA_CONTIG
> >  	select V4L2_MEM2MEM_DEV
> > -	select IRAM_ALLOC if SOC_IMX53
> >  	---help---
> >  	   Coda is a range of video codec IPs that supports
> >  	   H.264, MPEG-4, and other video formats.
> > diff --git a/drivers/media/platform/coda.c b/drivers/media/platform/coda.c
> > index cd04ae2..f17b659 100644
> > --- a/drivers/media/platform/coda.c
> > +++ b/drivers/media/platform/coda.c
> > @@ -14,6 +14,7 @@
> >  #include <linux/clk.h>
> >  #include <linux/delay.h>
> >  #include <linux/firmware.h>
> > +#include <linux/genalloc.h>
> >  #include <linux/interrupt.h>
> >  #include <linux/io.h>
> >  #include <linux/irq.h>
> > @@ -24,7 +25,6 @@
> >  #include <linux/videodev2.h>
> >  #include <linux/of.h>
> >  
> > -#include <mach/iram.h>
[...]

After dropping the #include <mach/iram.h>, there is no need
to depend on ARCH_MXC anymore.

regards
Philipp

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