From: Rahul Sharma Date: Mon, 28 Jan 2013 13:38:48 +0000 (-0500) Subject: drm: modify pages_to_sg prime helper to create optimized SG table X-Git-Tag: omap-for-v3.10/dt-fixes-for-merge-window~55^2~60^2~16 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=dca25cb80065849e71e5c95a7fd74b0d67695bf3;p=pandora-kernel.git drm: modify pages_to_sg prime helper to create optimized SG table It fixes the issue arises due to passing 'nr_pages' in place of 'nents' to sg_alloc_table. When ARM_HAS_SG_CHAIN is disabled, it is causing failure in creating SG table for the buffers having more than 204 physical pages i.e. equal to SG_MAX_SINGLE_ALLOC. When using sg_alloc_table_from_pages interface, in place of sg_alloc_table, page list will be passes to get each contiguous section which is represented by a single entry in the table. For a Contiguous Buffer, number of entries should be equal to 1. Following check is causing the failure which is not applicable for Non-Contig buffers: if (WARN_ON_ONCE(nents > max_ents)) return -EINVAL; Above patch is well tested for EXYNOS4 and EXYNOS5 for with/wihtout IOMMU supprot. NOUVEAU and RADEON platforms also depends on drm_prime_pages_to_sg helper function. This set is base on "exynos-drm-fixes" branch at http://git.kernel.org/?p=linux/kernel/git/daeinki/drm-exynos.git Signed-off-by: Rahul Sharma Acked-by: Dave Airlie Reviewed-by: Aaron Plattner Tested-by: Aaron Plattner Signed-off-by: Daniel Vetter --- Reading git-diff-tree failed