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

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Message-ID: <50A66307.3080706@windriver.com>
Date:	Fri, 16 Nov 2012 11:00:07 -0500
From:	Paul Gortmaker <paul.gortmaker@...driver.com>
To:	Philipp Zabel <p.zabel@...gutronix.de>
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

On 12-11-16 10:21 AM, Philipp Zabel wrote:
> 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.

So when I do an allyesconfig for sparc, or parisc or alpha,
and VIDEO_CODA gets selected, it will build just fine then?
My point was that when you remove the ARCH_MXC dep, this
probably gets opened up as a viable option to a _lot_ more
platforms than you might want it exposed to.

Paul.
--

> 
>> --
>>
>>>  	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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