4.19-stable review patch. If anyone has any objections, please let me know.
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From: Bumyong Lee bumyong.lee@samsung.com
[ Upstream commit 22a9d9585812440211b0b34a6bc02ade62314be4 ]
According to DMA-330 errata notice[1] 71930, DMAKILL cannot clear internal signal, named pipeline_req_active. it makes that pl330 would wait forever in WFP state although dma already send dma request if pl330 gets dma request before entering WFP state.
The errata suggests that polling until entering WFP state as workaround and then peripherals allows to issue dma request.
[1]: https://developer.arm.com/documentation/genc008428/latest
Signed-off-by: Bumyong Lee bumyong.lee@samsung.com Link: https://lore.kernel.org/r/20231219055026.118695-1-bumyong.lee@samsung.com Signed-off-by: Vinod Koul vkoul@kernel.org Stable-dep-of: afc89870ea67 ("dmaengine: Revert "dmaengine: pl330: issue_pending waits until WFP state"") Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/dma/pl330.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/drivers/dma/pl330.c b/drivers/dma/pl330.c index 1bba1fa3a8096..54bb6e46c1803 100644 --- a/drivers/dma/pl330.c +++ b/drivers/dma/pl330.c @@ -1045,6 +1045,9 @@ static bool _trigger(struct pl330_thread *thrd)
thrd->req_running = idx;
+ if (desc->rqtype == DMA_MEM_TO_DEV || desc->rqtype == DMA_DEV_TO_MEM) + UNTIL(thrd, PL330_STATE_WFP); + return true; }