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| author | Guennadi Liakhovetski <g.liakhovetski@gmx.de> | 2010-12-22 14:02:15 +0300 |
|---|---|---|
| committer | Chris Ball <cjb@laptop.org> | 2011-01-09 07:52:29 +0300 |
| commit | 93173054f2979de41b1912b19f0b57edfb35fcdc (patch) | |
| tree | 14c2872048dde7e15d386f1211836c86b1b6c69f /Documentation/braille-console.txt | |
| parent | e0bc6ff8b8d5c066d978d23e690d5599db4cb2b3 (diff) | |
| download | linux-93173054f2979de41b1912b19f0b57edfb35fcdc.tar.xz | |
mmc: tmio_mmc: implement a bounce buffer for unaligned DMA
For example, with SDIO WLAN cards, some transfers happen with buffers at
odd addresses, whereas the SH-Mobile DMA engine requires even addresses
for SDHI. This patch extends the tmio driver with a bounce buffer, that
is used for single entry scatter-gather lists both for sending and
receiving. If we ever encounter unaligned transfers with multi-element
sg lists, this patch will have to be extended. For now it just falls
back to PIO in this and other unsupported cases.
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Acked-by: Samuel Ortiz <sameo@linux.intel.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
Diffstat (limited to 'Documentation/braille-console.txt')
0 files changed, 0 insertions, 0 deletions