This is a note to let you know that I've just added the patch titled
drm/omap: DMM: Check for DMM readiness after successful transaction commit
to the 4.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...
The filename of the patch is: drm-omap-dmm-check-for-dmm-readiness-after-successful-transaction-commit.patch and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.
From foo@baz Thu Mar 22 14:57:33 CET 2018
From: Peter Ujfalusi peter.ujfalusi@ti.com Date: Fri, 29 Sep 2017 14:49:49 +0300 Subject: drm/omap: DMM: Check for DMM readiness after successful transaction commit
From: Peter Ujfalusi peter.ujfalusi@ti.com
[ 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 --- drivers/gpu/drm/omapdrm/omap_dmm_tiler.c | 5 +++++ 1 file changed, 5 insertions(+)
--- a/drivers/gpu/drm/omapdrm/omap_dmm_tiler.c +++ b/drivers/gpu/drm/omapdrm/omap_dmm_tiler.c @@ -288,7 +288,12 @@ static int dmm_txn_commit(struct dmm_txn 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:
Patches currently in stable-queue which might be from peter.ujfalusi@ti.com are
queue-4.4/drm-omap-dmm-check-for-dmm-readiness-after-successful-transaction-commit.patch queue-4.4/dmaengine-ti-dma-crossbar-fix-event-mapping-for-tpcc_evt_mux_60_63.patch