[PATCH] ARM: EXYNOS4: Setup consistent dma size at boot time

[Subash Patel]

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 at yxit.co.uk>
> Signed-off-by: Tushar Behera<tushar.behera at 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();