Hi, I would like to add support for cached user mapping to videobuf-dma-contig.c. For enabling this, "vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);" line should be removed. But now we should ensure user mapping cache coherency. For that, for a camera we should : - invalidate cache before dma operation (to have not old buffer data in the cache) - forbid the user to access the buffer during the dma operation (to not pollute the cache) Is it possible ? How can we achieve that ? I see sync method, that seems only called after frame capture ? Thanks, Matthieu -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
