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Tony Lindgren 340ad03188 dmaengine: ti: omap-dma: Skip pointless cpu_pm context restore on errors

There's no need to restore DMA context on CPU_CLUSTER_PM_ENTER_FAILED as
the DMA context won't be lost on errors.

Note that this does not cause invalid context restore as we already check
for busy DMA with omap_dma_busy() in CPU_CLUSTER_PM_ENTER, and block any
deeper idle states for the SoC by returning NOTIFY_BAD if busy.

If other drivers block deeper idle states with cpu_pm, we now just do a
pointless restore, but only if dma was not busy on CPU_CLUSTER_PM_ENTER.

Let's update the CPU_CLUSTER_PM_ENTER_FAILED handling for correctness,
and add a comment.

Cc: Aaro Koskinen <aaro.koskinen@iki.fi>
Cc: Adam Ford <aford173@gmail.com>
Cc: Andreas Kemnade <andreas@kemnade.info>
Cc: Peter Ujfalusi <peter.ujfalusi@gmail.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Acked-by: Peter Ujfalusi <peter.ujfalusi@gmail.com>
Link: https://lore.kernel.org/r/20210518074347.16908-1-tony@atomide.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

2021-05-31 10:01:53 +05:30

cppi41.c

dmaengine: cppi41: Fix cppi41_dma_prep_slave_sg() when idle

2019-10-23 21:15:21 +05:30

dma-crossbar.c

dmaengine: ti: drop of_match_ptr and mark of_device_id table as maybe unused

2020-11-24 23:02:20 +05:30

edma.c

dmaengine: Replace zero-length array with flexible-array

2020-06-15 23:08:30 -05:00

k3-psil-am64.c

dmaengine: ti: k3-psil: Add initial map for AM64