From: Peter Ujfalusi Date: Fri, 29 Sep 2017 11:49:49 +0000 (+0300) Subject: drm/omap: DMM: Check for DMM readiness after successful transaction commit X-Git-Tag: for-linus-20180210~4^2~20^2~2 X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=b7ea6b286c4051e043f691781785e3c4672f014a;p=linux-2.6-block.git 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 --- diff --git a/drivers/gpu/drm/omapdrm/omap_dmm_tiler.c b/drivers/gpu/drm/omapdrm/omap_dmm_tiler.c index d7f2940cb596..d348e20fe10c 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: