spi: davinci: fix EDMA CC errors at end of transfers

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Use a dummy param slot linked to itself to take care of the
extra "sync event" that gets sent to EDMA controller after
the last byte has been transferred.

The dummy PaRAM slot that is linked to the actual DMA PaRAM
slot "absorbs" this event and prevents a EDMA CC error to
be asserted.

Without this provision, the EDMA CC error would be asserted
because the channel PaRAM would be empty after the transfer
and EDMA would not know what to make out of the extra sync
event.

Signed-off-by: Brian Niebuhr <bniebuhr@efjohnson.com>
Tested-By: Michael Williamson <michael.williamson@criticallink.com>
Signed-off-by: Sekhar Nori <nsekhar@ti.com>

...

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Brian Niebuhr 2010-10-04 17:35:34 +05:30 • committed by Sekhar Nori

parent 903ca25b21

commit 523c37e700

1 changed files with 25 additions and 3 deletions

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drivers/spi/davinci_spi.c

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