diff options
author | Eric Miao <eric.miao@marvell.com> | 2008-12-16 11:54:34 +0800 |
---|---|---|
committer | Eric Miao <eric.miao@marvell.com> | 2008-12-29 17:59:16 +0800 |
commit | 77e196752bdd76a0c58ab082658d28c6a90fa40e (patch) | |
tree | 935fbe8b897d8770fff05254c6c91dc0a8058984 /Documentation/fb | |
parent | 5bfb4093be6ac7b6c06c8e6461d85241654acc61 (diff) | |
download | linux-77e196752bdd76a0c58ab082658d28c6a90fa40e.tar.gz |
[ARM] pxafb: allow video memory size to be configurable
The amount of video memory size is decided according to the following order: 1. <xres> x <yres> x <bits_per_pixel> by default, which is the backward compatible way 2. size specified in platform data 3. size specified in module parameter 'options' string or specified in kernel boot command line (see updated Documentation/fb/pxafb.txt) And now since the memory is allocated from system memory, the pxafb_mmap can be removed and the default fb_mmap() should be working all right. Also, since we now have introduced the 'struct pxafb_dma_buff' for DMA descriptors and palettes, the allocation can be separated cleanly. NOTE: the LCD DMA actually supports chained transfer (i.e. page-based transfers), to simplify the logic and keep the performance (with less TLB misses when accessing from memory mapped user space), the memory is allocated by alloc_pages_*() to ensures it's physical contiguous. Signed-off-by: Eric Miao <eric.miao@marvell.com> Signed-off-by: Eric Miao <ycmiao@ycmiao-hp520.(none)>
Diffstat (limited to 'Documentation/fb')
-rw-r--r-- | Documentation/fb/pxafb.txt | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/Documentation/fb/pxafb.txt b/Documentation/fb/pxafb.txt index db9b8500b43b..ad94b5ca0095 100644 --- a/Documentation/fb/pxafb.txt +++ b/Documentation/fb/pxafb.txt @@ -5,9 +5,13 @@ The driver supports the following options, either via options=<OPTIONS> when modular or video=pxafb:<OPTIONS> when built in. For example: - modprobe pxafb options=mode:640x480-8,passive + modprobe pxafb options=vmem:2M,mode:640x480-8,passive or on the kernel command line - video=pxafb:mode:640x480-8,passive + video=pxafb:vmem:2M,mode:640x480-8,passive + +vmem: VIDEO_MEM_SIZE + Amount of video memory to allocate (can be suffixed with K or M + for kilobytes or megabytes) mode:XRESxYRES[-BPP] XRES == LCCR1_PPL + 1 |