linux-kernel - Re: [PATCH v2 0/3] dmaengine: ti-dma-crossbar: channel reserving and edma3-tpcc support

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Date:	Mon, 30 Nov 2015 20:48:06 +0530
From:	Vinod Koul <vinod.koul@...el.com>
To:	Peter Ujfalusi <peter.ujfalusi@...com>
Cc:	nsekhar@...com, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org,
	dmaengine@...r.kernel.org, devicetree@...r.kernel.org,
	tony@...mide.com, r.schwebel@...gutronix.de
Subject: Re: [PATCH v2 0/3] dmaengine: ti-dma-crossbar: channel reserving and
 edma3-tpcc support

On Fri, Oct 30, 2015 at 10:00:35AM +0200, Peter Ujfalusi wrote:
> Hi,
> 
> Changes since v1:
> - Fixed issue introduced by the bitops patch: wrong error check, also switch to
>   use find_first_zero_bit() instead of find_next_zero_bit()
> 
> Cover letter:
> 
> This series depends on the eDMA work I have done, which has been now applied:
> https://lkml.org/lkml/2015/10/16/64
> 
> DRA7 family of chips have both sDMA and eDMA. Currently only sDMA can be used
> becasue the old driver stack for eDMA did not allowed integration w/o hacks.
> 
> Due to the nature of eDMA the crossbar needs to know which eDMA events it can
> use to map incoming events towards the eDMA. In eDMA a channel is wired to be
> used with one specific event. For example eDMA event 14 can only be handled by
> eDMA channel 14.
> The eDMA itself can be shared by different processors in the system (ARM, DSP,
> etc) and since ARM/Linux is the master we need to know which channels are used
> by other cores. Also we need to mask out channels used for memcpy from the
> events we use for HW triggers.

Applied, thanks

-- 
~Vinod
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