Hi Subash,
On Monday 12 September 2011 08:32 PM, Subash Patel wrote:
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 Medhursttixy@yxit.co.uk Signed-off-by: Tushar Beheratushar.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?
We are using dma_alloc_writecombine to allocate frame buffer memory. Ref: linux/drivers/video/s3c-fb.c:s3c_fb_alloc_memory().
CMA is not yet part of the mainline kernel and hence there is no way the FB can use CMA for memory allocation.
Regards, Subash
/* initialize device information early */ exynos4_default_sdhci0();