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drm/omap: DMM: Check for DMM readiness after successful transaction commit

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[ Upstream commit b7ea6b286c4051e043f691781785e3c4672f014a ]

Check the status of the DMM engine after it is reported that the
transaction was completed as in rare cases the engine might not reached a
working state.

The wait_status() will print information in case the DMM is not reached the
expected state and the dmm_txn_commit() will return with an error code to
make sure that we are not continuing with a broken setup.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Peter Ujfalusi 2017-09-29 14:49:49 +03:00 committed by Greg Kroah-Hartman
parent 9967208b4f
commit 728e120d17
1 changed files with 5 additions and 0 deletions
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5
drivers/gpu/drm/omapdrm/omap_dmm_tiler.c
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@ -298,7 +298,12 @@ static int dmm_txn_commit(struct dmm_txn *txn, bool wait)
msecs_to_jiffies(100))) {
dev_err(dmm->dev, "timed out waiting for done\n");
ret = -ETIMEDOUT;
goto cleanup;
}
/* Check the engine status before continue */
ret = wait_status(engine, DMM_PATSTATUS_READY |
DMM_PATSTATUS_VALID | DMM_PATSTATUS_DONE);
}
cleanup: