linux-kernel - RE: [PATCH v5 16/16] dmaengine: dw-axi-dmac: Virtually split the linked-list

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Date:   Wed, 9 Dec 2020 01:47:06 +0000
From:   "Sia, Jee Heng" <jee.heng.sia@...el.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
CC:     "vkoul@...nel.org" <vkoul@...nel.org>,
        "Eugeniy.Paltsev@...opsys.com" <Eugeniy.Paltsev@...opsys.com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "dmaengine@...r.kernel.org" <dmaengine@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: RE: [PATCH v5 16/16] dmaengine: dw-axi-dmac: Virtually split the
 linked-list



> -----Original Message-----
> From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> Sent: 23 November 2020 6:23 PM
> To: Sia, Jee Heng <jee.heng.sia@...el.com>
> Cc: vkoul@...nel.org; Eugeniy.Paltsev@...opsys.com;
> robh+dt@...nel.org; dmaengine@...r.kernel.org; linux-
> kernel@...r.kernel.org; devicetree@...r.kernel.org
> Subject: Re: [PATCH v5 16/16] dmaengine: dw-axi-dmac: Virtually split
> the linked-list
> 
> On Mon, Nov 23, 2020 at 10:34:52AM +0800, Sia Jee Heng wrote:
> > AxiDMA driver exposed the dma_set_max_seg_size() to the
> DMAENGINE.
> > It shall helps the DMA clients to create size-optimized linked-list
> > for the controller.
> >
> > However, there are certain situations where DMA client might not be
> > abled to benefit from the dma_get_max_seg_size() if the segment
> size
> > can't meet the nature of the DMA client's operation.
> >
> > In the case of ALSA operation, ALSA application and driver expecting
> > to run in a period of larger than 10ms regardless of the bit depth.
> > With this large period, there is a strong request to split the
> > linked-list in the AxiDMA driver.
> 
> I'm wondering why ASoC generic code can't use DMA channel and
> device capabilities and prepare SG list with all limitations taken into
> account.
[>>] There is no further comment to split the linked-list in DMA, I assume we can proceed with this patch.
[>>] The RFC patch is submitted at below link and you are in the thread.
[>>] https://lore.kernel.org/alsa-devel/CO1PR11MB5026545F07968DBC5386CF45DACD0@CO1PR11MB5026.namprd11.prod.outlook.com/T/#u

> 
> 
> --
> With Best Regards,
> Andy Shevchenko
>