steven.zhang wrote:
Hi, all.
I am porting the davincifb driver to support 1280*720 resolution.
As you know, I should alloc memory for different OSD windows.
To support 1280*720 p, I do it as follows:
#define DISP_XRES 1280
#define DISP_YRES 720
#define DISP_MEMY 740
#define VID0_FB_SIZE (round_32(DISP_XRES*16/8) * DISP_MEMY * TRIPLE_BUF)
using dma_alloc_coherent() to allocate 5683200byte
memory.However, it fails.
when define DISP_XRES be 720 and DISP_YRES be 480, it succeeds.
What can be the problems? dma_alloc_coherent() can not allocate 5683200
(about 5M) memory using for DMA?
maybe this:
http://kerneltrap.org/node/3600
what is your CONSISTENT_DMA_SIZE, default is:
/linux/include/asm/memory.h:
#define CONSISTENT_DMA_SIZE SZ_2M
but your arch could define another value.
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