OMAP: DMA: mstandby mode and runtime pm support

Quoted 21 lines · Manjunath Kondaiah

Quoted 19 lines · Kevin Hilman

Quoted 2 lines · Manjunath Kondaiah

This patch series is remaining part of dma hwmod to support pm runtime and for handling mstandby mode for all applicable DMA mstandby mode errata.

This is still not runtime-suspending when I use my DMA test in linking mode.

If I put a large enough period between transfers, it should autosuspend during transfers. It seems to do auto-suspend and resume once, but then it never suspends again.

I tested with my dmatest module[1], and loaded with:

  # insmod ./dmatest.ko linking=1 forever=1 forever_period=1024

Not only does it not auto-suspend between transfers (which I expected), it also doesn't suspend after removing the module which stops all active channels.

Quoted 2 lines

The normal chaining test cases are executed and which used to show the proper status. Let me reproduce this issue with your test procedure.

ok. I am able to reproduce this issue and fixed _get_sync usage in omap_start_dma if channel linking is used. Earlier it was handled for the cases with chaining API's. If linking is done without chaining API's, it will result in _get_sync and _put mismatch.

Thanks for the test case and I will be re posting the patches with the above fix.