Hi Laurent,
On Mon, Feb 11, 2013 at 04:02:23PM +0100, Laurent Pinchart wrote:
> Hi Michael,
>
> On Friday 08 February 2013 23:38:59 Bhupesh SHARMA wrote:
>
> [snip]
>
> > > Beside my two comments on patch 3 i have tested it with the contig
> > > allocator instead of vmalloc [ยน]. With that changes applied i can give my
> > > Tested-By if desired.
> >
> > @ Michael, sure I can apply your comments and also Laurent's and then
> > probably you can add your Tested-By. @ Laurent, would that be fine?
>
> What are your use cases that require vb2 dma-contig instead of vb2 vmalloc ?
We are currently working with USERPTR buffers which are, in the first
instance, dma-alloc buffers which come from an camera and are shared by
gstreamer. The UVC-Camera needs the physical address in the end. For
that the videobuf2-dam-contig.c has following hack.
diff --git a/drivers/media/video/videobuf2-dma-contig.c
b/drivers/media/video/videobuf2-dma-contig.c
index cac8114..c828b46 100644
--- a/drivers/media/video/videobuf2-dma-contig.c
+++ b/drivers/media/video/videobuf2-dma-contig.c
@@ -133,6 +133,7 @@ static void *vb2_dma_contig_get_userptr(void *alloc_ctx,
unsigned long vaddr,
return ERR_PTR(ret);
}
+ buf->vaddr = phys_to_virt(dma_addr);
buf->size = size;
buf->dma_addr = dma_addr;
buf->vma = vma;
Regards,
Michael
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