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Date: Tue, 21 Sep 2010 15:05:05 -0700 From: Dan Malek <ppc6dev@...italdans.com> To: Scott Wood <scottwood@...escale.com> Cc: Timur Tabi <timur.tabi@...il.com>, dan.j.williams@...el.com, linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH] fsldma: add support to 36-bit physical address On Sep 21, 2010, at 2:49 PM, Scott Wood wrote: > > On Tue, 21 Sep 2010 16:43:12 -0500 > Timur Tabi <timur.tabi@...il.com> wrote: > >> Since we don't DMA the descriptors themselves, I just don't see how >> this patch does anything. > > Look in dmaengine.c, there are calls to dma_map_single() and > dma_map_page(), using what I assume is that same device pointer -- > unless there's confusion between the channel and the controller. The DMA descriptors are accessed using DMA by the controller itself. The APIs need to ensure proper coherency between the CPU and the DMA controller for the descriptor access. The underlying implementation of the API will depend upon the hardware capabilities that ensure this coherency. -- Dan -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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