From: Micky Ching Date: Mon, 17 Feb 2014 08:45:48 +0000 (+0800) Subject: mmc: rtsx: add support for pre_req and post_req X-Git-Tag: v3.15-rc1~42^2~76 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c42deffd5b53c9e583d83c7964854ede2f12410d;p=pandora-kernel.git mmc: rtsx: add support for pre_req and post_req Add support for non-blocking request, pre_req() runs dma_map_sg() and post_req() runs dma_unmap_sg(). This patch can increase card read/write speed, especially for high speed card and slow CPU(for some embedded platform). Users can get a great benefit from this patch. if CPU frequency is 800MHz, SDR104 or DDR50 card read/write speed may increase more than 15%. test results: intel i3(800MHz - 2.3GHz), SD card clock 208MHz performance mode(2.3GHz): Before: dd if=/dev/mmcblk0p1 of=/dev/null bs=64k count=1024 67108864 bytes (67 MB) copied, 1.18191 s, 56.8 MB/s After: dd if=/dev/mmcblk0p1 of=/dev/null bs=64k count=1024 67108864 bytes (67 MB) copied, 1.09276 s, 61.4 MB/s powersave mode(800MHz): Before: dd if=/dev/mmcblk0p1 of=/dev/null bs=64k count=1024 67108864 bytes (67 MB) copied, 1.29569 s, 51.8 MB/s After: dd if=/dev/mmcblk0p1 of=/dev/null bs=64k count=1024 67108864 bytes (67 MB) copied, 1.11218 s, 60.3 MB/s Signed-off-by: Micky Ching Signed-off-by: Chris Ball --- Reading git-diff-tree failed