linux-kernel - Re: [PATCH 1/2] dma: add Qualcomm Technologies HIDMA management driver

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Date:	Fri, 30 Oct 2015 19:01:06 +0000
From:	Mark Rutland <mark.rutland@....com>
To:	Sinan Kaya <okaya@...eaurora.org>
Cc:	Andy Shevchenko <andy.shevchenko@...il.com>,
	dmaengine <dmaengine@...r.kernel.org>, timur@...eaurora.org,
	cov@...eaurora.org, jcm@...hat.com,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Vinod Koul <vinod.koul@...el.com>,
	Dan Williams <dan.j.williams@...el.com>,
	devicetree <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	leif.lindholm@...aro.org, al.stone@...aro.org
Subject: Re: [PATCH 1/2] dma: add Qualcomm Technologies HIDMA management
 driver

On Fri, Oct 30, 2015 at 02:48:06PM -0400, Sinan Kaya wrote:
> >>>>It was decided by
> >>>>Linaro that CSRT will not be supported for ARM64.

> See this.
> 
> https://wiki.linaro.org/LEG/Engineering/Kernel/ACPI/TablePriorities

The CSRT is listed under "Want", not "Never" or "Don't Care", so Linaro
have certainly not said that CSRT will not be supported. If anything,
they have stated that the table should be supported.

I suspect that the rationale for it not being "Critical" or "Must" is
that it's possible to use contemporary systems without DMA engines, but
we will need support at some point in future.

I also note that there are Linaro patches adding supoprt for DBG2 [1] ,
which is listed as "Never". So the page may be out of date...

Leif, Al?

[1] https://lkml.org/lkml/2015/9/8/287

Thanks,
Mark.
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