From mboxrd@z Thu Jan  1 00:00:00 1970
From: Subash Patel <subashrp@gmail.com>
Subject: Re: [PATCH] ARM: EXYNOS4: Setup consistent dma size at boot time
Date: Mon, 12 Sep 2011 20:32:32 +0530
Message-ID: <4E6E1F08.7030407@gmail.com>
References: <1315806945-3102-1-git-send-email-tushar.behera@linaro.org>
Mime-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
Return-path: <linux-samsung-soc-owner@vger.kernel.org>
Received: from mail-gy0-f174.google.com ([209.85.160.174]:39648 "EHLO
	mail-gy0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
	with ESMTP id S1757275Ab1ILPCi (ORCPT
	<rfc822;linux-samsung-soc@vger.kernel.org>);
	Mon, 12 Sep 2011 11:02:38 -0400
Received: by gyg10 with SMTP id 10so210958gyg.19
        for <linux-samsung-soc@vger.kernel.org>; Mon, 12 Sep 2011 08:02:37 -0700 (PDT)
In-Reply-To: <1315806945-3102-1-git-send-email-tushar.behera@linaro.org>
Sender: linux-samsung-soc-owner@vger.kernel.org
List-Id: linux-samsung-soc@vger.kernel.org
To: Tushar Behera <tushar.behera@linaro.org>
Cc: linux-samsung-soc@vger.kernel.org, kgene.kim@samsung.com, linaro-dev@lists.linaro.org, patches@linaro.org, Jon Medhurst <tixy@yxit.co.uk>

Hi Tushar,

On 09/12/2011 11:25 AM, Tushar Behera wrote:
> Some of the boards under mach-exynos4 initialize frame-buffers
> for which the memory requirement is more than 2MB (Nuri board requires
> around 4MB, Origen requires around 2.6MB), hence the default dma pool
> allocation size of 2MB is not sufficient. The consistent dma size is
> hence increased to successfully allocate memory for those boards.
>
> Depends on "ARM: Add init_consistent_dma_size()"
> by Jon Medhurst (99d1717dd7fecf2b10195b0d864323b952b4eba0).
>
> CC: Jon Medhurst<tixy@yxit.co.uk>
> Signed-off-by: Tushar Behera<tushar.behera@linaro.org>
> ---
>   arch/arm/mach-exynos4/cpu.c |    2 ++
>   1 files changed, 2 insertions(+), 0 deletions(-)
>
> diff --git a/arch/arm/mach-exynos4/cpu.c b/arch/arm/mach-exynos4/cpu.c
> index 2d8a40c..45d8bfa 100644
> --- a/arch/arm/mach-exynos4/cpu.c
> +++ b/arch/arm/mach-exynos4/cpu.c
> @@ -10,6 +10,7 @@
>
>   #include<linux/sched.h>
>   #include<linux/sysdev.h>
> +#include<linux/dma-mapping.h>
>
>   #include<asm/mach/map.h>
>   #include<asm/mach/irq.h>
> @@ -136,6 +137,7 @@ static void exynos4_idle(void)
>   void __init exynos4_map_io(void)
>   {
>   	iotable_init(exynos4_iodesc, ARRAY_SIZE(exynos4_iodesc));
> +	init_consistent_dma_size(SZ_8M);
>

I think CMA is being used to allocate the FB in origen machine. In that 
case, increasing the consistent memory is not useful. If the memory is 
increased in the consistent DMA area, how can that be useful to s3cfb?

Regards,
Subash


>   	/* initialize device information early */
>   	exynos4_default_sdhci0();