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authorAnton Staaf <robotboy@chromium.org>2011-06-30 09:55:08 +0000
committerAlbert ARIBAUD <albert.u.boot@aribaud.net>2011-09-03 22:40:47 +0200
commit9070872bb343e07945bf3882c572da82901c637d (patch)
tree35a777748213c0f01eecac00b6b5a4d809d4df50 /board/samsung
parent34d34b88b6b3d947de86dae81574bdde85b8d01e (diff)
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mmc: S5P: Support DMA restarts at buffer boundaries
Currently if a DMA buffer straddles a buffer alignment boundary (512KiB) then the DMA engine will pause and generate a DMA interrupt. Since the DMA interrupt is not enabled it will hang the MMC driver. This patch adds support for restarting the DMA transfer. The SYSTEM_ADDRESS register contains the next address that would have been read/written when a boundary is hit. So we can read that and write it back. The write triggers the resumption of the transfer. Signed-off-by: Anton Staaf <robotboy@chromium.org> Signed-off-by: Minkyu Kang <mk7.kang@samsung.com> Tested-by : Jaehoon Chung <jh80.chung@samsung.com> Cc: Albert ARIBAUD <albert.u.boot@aribaud.net>
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