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| author | Tomoya MORINAGA <tomoya-linux@dsn.okisemi.com> | 2011-09-06 17:16:38 +0900 |
|---|---|---|
| committer | Grant Likely <grant.likely@secretlab.ca> | 2011-10-04 10:10:50 -0600 |
| commit | f3e03e2eb0bcd9266720695b82a523e6bc526ff7 (patch) | |
| tree | 12184b7ed8bea50f0ca10ff44c7f37e5c1bb0e07 /drivers/spi/spi-coldfire-qspi.c | |
| parent | 25e803f9c339a070cd7361e853aebde11b1f9217 (diff) | |
spi-topcliff-pch: Fix overrun issue
We found that adding load, Rx data sometimes drops.(with DMA transfer mode)
The cause is that before starting Rx-DMA processing, Tx-DMA processing starts.
This causes FIFO overrun occurs.
This patch fixes the issue by modifying FIFO tx-threshold and DMA descriptor
size like below.
Current this patch
Rx-descriptor 4Byte+12Byte*341 --> 12Byte*340-4Byte-12Byte
Rx-threshold (Not modified)
Tx-descriptor 4Byte+12Byte*341 --> 16Byte-12Byte*340
Rx-threshold 12Byte --> 2Byte
Signed-off-by: Tomoya MORINAGA <tomoya-linux@dsn.okisemi.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Diffstat (limited to 'drivers/spi/spi-coldfire-qspi.c')
0 files changed, 0 insertions, 0 deletions