> -----Original Message----- > From: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx> > Sent: 23 November 2020 6:23 PM > To: Sia, Jee Heng <jee.heng.sia@xxxxxxxxx> > Cc: vkoul@xxxxxxxxxx; Eugeniy.Paltsev@xxxxxxxxxxxx; > robh+dt@xxxxxxxxxx; dmaengine@xxxxxxxxxxxxxxx; linux- > kernel@xxxxxxxxxxxxxxx; devicetree@xxxxxxxxxxxxxxx > 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@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx/T/#u > > > -- > With Best Regards, > Andy Shevchenko >
