firmware: imx: scu: Ensure sequential TX

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SCU requires that all messages words are written sequentially but linux MU
driver implements multiple independent channels for each register so ordering
between different channels must be ensured by SCU API interface.

Wait for tx_done before every send to ensure that no queueing happens at the
mailbox channel level.

Fixes: edbee095fa ("firmware: imx: add SCU firmware driver support")
Signed-off-by: Leonard Crestez <leonard.crestez@nxp.com>
Cc: <stable@vger.kernel.org>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
Reviewed-by:: Oleksij Rempel <o.rempel@pengutronix.de>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

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Leonard Crestez 2020-02-20 18:10:01 +02:00 • committed by Shawn Guo

parent 2773fe1d31

commit 26d0fba29c

1 changed files with 27 additions and 0 deletions

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drivers/firmware/imx/imx-scu.c

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