From 2cc45cf25a2c14da6d18b7570a23ec09fb8f439a Mon Sep 17 00:00:00 2001 From: Magnus Damm Date: Wed, 16 Jul 2008 21:33:39 -0300 Subject: V4L/DVB (8341): videobuf: Add physically contiguous queue code V3 This is V3 of the physically contiguous videobuf queues patch. Useful for hardware such as the SuperH Mobile CEU which doesn't support scatter gatter bus mastering. Since it may be difficult to allocate large chunks of physically contiguous memory after some uptime due to fragmentation, this code allocates memory using dma_alloc_coherent(). Architectures supporting dma_declare_coherent_memory() can easily avoid fragmentation issues by using dma_declare_coherent_memory() to force dma_alloc_coherent() to allocate from a certain pre-allocated memory area. Changes since V2 - use dma_handle for physical address - use "scatter gather" instead of "scatter gatter" Changes since V1: - use dev_err() instead of pr_err() - remember size in struct videobuf_dma_contig_memory - keep struct videobuf_dma_contig_memory in .c file - let videobuf_to_dma_contig() return dma_addr_t - implement __videobuf_sync() - return statements, white space and other minor fixes Signed-off-by: Magnus Damm Signed-off-by: Guennadi Liakhovetski Signed-off-by: Mauro Carvalho Chehab --- drivers/media/video/Kconfig | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'drivers/media/video/Kconfig') diff --git a/drivers/media/video/Kconfig b/drivers/media/video/Kconfig index 2103f7bfd48..9a4265e5cd8 100644 --- a/drivers/media/video/Kconfig +++ b/drivers/media/video/Kconfig @@ -24,6 +24,11 @@ config VIDEOBUF_VMALLOC select VIDEOBUF_GEN tristate +config VIDEOBUF_DMA_CONTIG + depends on HAS_DMA + select VIDEOBUF_GEN + tristate + config VIDEOBUF_DVB tristate select VIDEOBUF_GEN -- cgit v1.2.3