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Date: Fri, 09 Jan 2009 23:06:26 +0900 (JST) From: Atsushi Nemoto <anemo@....ocn.ne.jp> To: haavard.skinnemoen@...el.com Cc: linux-kernel@...r.kernel.org, maciej.sosnowski@...el.com, dan.j.williams@...el.com Subject: Re: dw_dmac driver questions On Mon, 05 Jan 2009 23:02:30 +0900 (JST), Atsushi Nemoto <anemo@....ocn.ne.jp> wrote: > On Mon, 29 Dec 2008 23:39:32 +0900 (JST), Atsushi Nemoto <anemo@....ocn.ne.jp> wrote: > > Hi. I'm writing a new DMA driver, using dw_dmac driver in kernel > > 2.6.28 as a reference implementation. > > > > I can see an outline of the dw_dmac driver and framework (well, > > hopefully), but have some questions in details. > > One more. One more again. 5. dwc_issue_pending() Is this needed? The dwc_tx_submit might queue the descriptor, but it should be issued automatically after completion of all descriptors in active list. It yes, it seems implementation like this would be possible: * dwc_tx_submit() just always add the descriptor to queue list even if active list was empty. * dwc_issue_pending() call dwc_dostart() and move queued descriptor(s) to active list, if the active list was empty. But I'm not sure "chain as many as possible at a time" is really better then "start engine as soon as possible". --- Atsushi Nemoto -- 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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