serial: 8250: Validate dmaengine rx chan meets requirements

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8250 dma support requires the dmaengine driver support error-free
pause/terminate and better-than-descriptor residue granularity. Query
slave caps to determine if necessary commands/properties are supported;
disable dma if not.

Note this means dmaengine driver must support slave caps reporting
as well.

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Peter Hurley 2016-04-09 22:14:32 -07:00 • committed by Greg Kroah-Hartman

parent 06c5e362ce

commit ec5a11a91e

1 changed files with 21 additions and 6 deletions

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drivers/tty/serial/8250/8250_dma.c

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