greybus: drop host-driver buffer headroom

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Drop the host-driver buffer headroom that was used to transfer the cport
id on ES1 and ES2.

Rather than transferring additional bytes on the wire and having to deal
with buffer-alignment issues (e.g. requiring the headroom to be a
multiple of 8 bytes) simply drop the headroom functionality.

Host drivers are expected set up their transfer descriptors separately
from the data buffers and any intermediate drivers (e.g. for Greybus
over USB) can (ab)use the operation message pad bytes for now.

Signed-off-by: Johan Hovold <johan@hovoldconsulting.com>
Reviewed-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

...

This commit is contained in:

Johan Hovold 2015-04-07 11:27:21 +02:00 • committed by Greg Kroah-Hartman

parent 491e60d63f

commit 24ef485398

4 changed files with 4 additions and 52 deletions

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20

drivers/staging/greybus/es1.c

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20

drivers/staging/greybus/es2.c

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9

drivers/staging/greybus/greybus.h

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7

drivers/staging/greybus/operation.c

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