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Date: Tue, 2 Dec 2008 10:16:05 -0700 From: "Dan Williams" <dan.j.williams@...el.com> To: "Guennadi Liakhovetski" <g.liakhovetski@....de> Cc: linux-kernel@...r.kernel.org, netdev@...r.kernel.org, maciej.sosnowski@...el.com, hskinnemoen@...el.com, nicolas.ferre@...el.com Subject: Re: [PATCH 07/13] dmaengine: introduce dma_request_channel and private channels On Tue, Dec 2, 2008 at 8:52 AM, Guennadi Liakhovetski <g.liakhovetski@....de> wrote: > Hi Dan, > > I think, there is a problem with your dma_request_channel() / > private_candidate() implementation: your current version only tries one > channel from a dma device list, which matched capabilities. If this > channel is not accepted by the client, you do not try other channels from > this device and just go to the next one... > Which dma driver are you using? The dmaengine code assumes that all channels on a device are equal. It sounds like there are differences between peer-channels on the device in this case. If the driver registers a device per channel that should give the flexibility you want. > Another problem I encountered with my framebuffer is the initialisation > order. You initialise dmaengine per subsys_initcall(), whereas the only > way to guarantee the order: > > dmaengine > dma-device driver > framebuffer > hmm... can the framebuffer be moved to late_initcall? Regards, 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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