linux-kernel - Re: [PATCH] dma: add support for reporting pause and resume separately

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Message-ID: <20180709172937.GP22377@vkoul-mobl>
Date:   Mon, 9 Jul 2018 22:59:37 +0530
From:   Vinod <vkoul@...nel.org>
To:     Marek Szyprowski <m.szyprowski@...sung.com>
Cc:     dmaengine@...r.kernel.org, alsa-devel@...a-project.org,
        linux-kernel@...r.kernel.org,
        Dan Williams <dan.j.williams@...el.com>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Mark Brown <broonie@...nel.org>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
Subject: Re: [PATCH] dma: add support for reporting pause and resume
 separately

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