From b7ea6b286c4051e043f691781785e3c4672f014a Mon Sep 17 00:00:00 2001 From: Peter Ujfalusi Date: Fri, 29 Sep 2017 14:49:49 +0300 Subject: [PATCH] drm/omap: DMM: Check for DMM readiness after successful transaction commit 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 Signed-off-by: Tomi Valkeinen --- drivers/gpu/drm/omapdrm/omap_dmm_tiler.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/gpu/drm/omapdrm/omap_dmm_tiler.c b/drivers/gpu/drm/omapdrm/omap_dmm_tiler.c index d7f2940..d348e20 100644 --- a/drivers/gpu/drm/omapdrm/omap_dmm_tiler.c +++ b/drivers/gpu/drm/omapdrm/omap_dmm_tiler.c @@ -311,7 +311,12 @@ 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: -- 2.7.4