Messages in this thread | | | Date | Mon, 9 Jul 2018 22:59:37 +0530 | From | Vinod <> | Subject | Re: [PATCH] dma: add support for reporting pause and resume separately |
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On 02-07-18, 15:08, Marek Szyprowski wrote: > 'cmd_pause' DMA channel capability means that respective DMA engine > supports both pausing and resuming given DMA channel. However, in some > cases it is important to know if DMA channel can be paused without the > need to resume it. This is a typical requirement for proper residue > reading on transfer timeout in UART drivers. There are also some DMA > engines with limited hardware, which doesn't really support resuming. > > Reporting pause and resume capabilities separately allows UART drivers to > properly check for the really required capabilities and operate in DMA > mode also in systems with limited DMA hardware. On the other hand drivers, > which rely on full channel suspend/resume support, should now check for > both 'pause' and 'resume' features. > > Existing clients of dma_get_slave_caps() have been checked and the only > driver which rely on proper channel resuming is soc-generic-dmaengine-pcm > driver, which has been updated to check the newly added capability. > Existing 'cmd_pause' now only indicates that DMA engine support pausing > given DMA channel.
Applied after fixing the subsystem name, thanks
-- ~Vinod
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