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Date: Wed, 27 Jul 2011 12:59:09 +0300 From: Mika Westerberg <mika.westerberg@...ux.intel.com> To: "Koul, Vinod" <vinod.koul@...el.com> Cc: Jaswinder Singh <jaswinder.singh@...aro.org>, "Williams, Dan J" <dan.j.williams@...el.com>, Linus Walleij <linus.walleij@...aro.org>, linux-kernel@...r.kernel.org, rmk+kernel@....linux.org.uk, linus.walleij@...ricsson.com, per.friden@...ricsson.com, wei.zhang@...escale.com, ebony.zhu@...escale.com, iws@...o.caltech.edu, s.hauer@...gutronix.de, maciej.sosnowski@...el.com, saeed@...vell.com, shawn.guo@...escale.com, yur@...raft.com, agust@...x.de, iwamatsu.nobuhiro@...esas.com, per.forlin@...ricsson.com, jonas.aberg@...ricsson.com, anemo@....ocn.ne.jp Subject: Re: [PATCHv2] DMAEngine: Let dmac drivers to set chan_id On Wed, Jul 27, 2011 at 02:32:26PM +0530, Koul, Vinod wrote: > Can you please help me understand why channel number "x" is important > and strictly needed by some client? At least in ep93xx we have even channel numbers for TX and odd for RX (or vice versa, can't rememeber). This is a hardware restriction. So the client code then filters the channels based on that using ->chan_id. As the caps are not per channel, that is the only way I was able to make it work. -- 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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