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From: Arnd Bergmann <arnd-r2nGTMty4D4@public.gmane.org>
To: Timur Tabi <timur-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
Cc: Sinan Kaya <okaya-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>,
	dmaengine-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	cov-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org,
	jcm-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org,
	Rob Herring <robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
	Pawel Moll <pawel.moll-5wv7dgnIgG8@public.gmane.org>,
	Mark Rutland <mark.rutland-5wv7dgnIgG8@public.gmane.org>,
	Ian Campbell
	<ijc+devicetree-KcIKpvwj1kUDXYZnReoRVg@public.gmane.org>,
	Kumar Gala <galak-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>,
	Vinod Koul <vinod.koul-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>,
	Dan Williams
	<dan.j.williams-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>,
	devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: [PATCH 2/2] dma: add Qualcomm Technologies HIDMA channel driver
Date: Fri, 30 Oct 2015 23:47:46 +0100	[thread overview]
Message-ID: <5126606.XdciyP3Dft@wuerfel> (raw)
In-Reply-To: <5633E744.6040202-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>

On Friday 30 October 2015 16:55:16 Timur Tabi wrote:
> 
> On 10/30/2015 04:42 PM, Sinan Kaya wrote:
> >>
> >>     if (WARN_ON(!pdev->dev.dma_mask))
> >>         return -ENXIO;
> >>
> >> The dma mask has to always be set by the platform code before probe()
> >> is called. If it is not set, you are not allowed to perform DMA.
> >
> > I tested this on an ACPI platform BTW when I was working on the initial
> > implementation.
> 
> PowerPC sets the mask to 32 bits by default:
> 
> http://lxr.free-electrons.com/ident?i=arch_setup_pdev_archdata
> 
> Should we do something similar in ARM64?  Today, we have to manually set 
> the DMA mask in all drivers.

We set the dma mask from the 'dma-ranges' property of the parent device,
but fall back to 32-bit because we did not manage to mandate this property
in time for all arm64 machines to use.

	Arnd
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  parent reply	other threads:[~2015-10-30 22:47 UTC|newest]

Thread overview: 51+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-10-30  3:08 [PATCH 1/2] dma: add Qualcomm Technologies HIDMA management driver Sinan Kaya
2015-10-30  3:08 ` [PATCH 2/2] dma: add Qualcomm Technologies HIDMA channel driver Sinan Kaya
2015-10-30  8:01   ` kbuild test robot
     [not found]   ` <1446174501-8870-2-git-send-email-okaya-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2015-10-30  8:07     ` kbuild test robot
2015-10-30 14:50     ` Mark Rutland
2015-10-31  4:27       ` Sinan Kaya
2015-10-30 10:24   ` Arnd Bergmann
2015-10-30 21:42     ` Sinan Kaya
     [not found]       ` <5633E442.3010003-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2015-10-30 21:55         ` Timur Tabi
     [not found]           ` <5633E744.6040202-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2015-10-30 22:47             ` Arnd Bergmann [this message]
2015-10-30 22:28       ` Arnd Bergmann
2015-10-30 22:36         ` Timur Tabi
2015-10-30 22:50           ` Arnd Bergmann
2015-10-31  1:53         ` Sinan Kaya
2015-11-01 18:50         ` Sinan Kaya
     [not found]           ` <56365F0D.6010508-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2015-11-01 20:21             ` Timur Tabi
     [not found]               ` <56367433.60806-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2015-11-01 20:27                 ` Sinan Kaya
2015-11-02 16:33             ` Arnd Bergmann
2015-11-02 19:21               ` Sinan Kaya
     [not found]                 ` <5637B7C1.2070200-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2015-11-02 20:55                   ` Arnd Bergmann
2015-11-03  5:29                     ` Sinan Kaya
2015-11-03 10:43                       ` Arnd Bergmann
2015-11-03 21:07                         ` Sinan Kaya
2015-11-03 21:10                           ` Arnd Bergmann
2015-10-30  4:34 ` [PATCH 1/2] dma: add Qualcomm Technologies HIDMA management driver kbuild test robot
     [not found]   ` <1446174501-8870-1-git-send-email-okaya-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2015-10-30  4:34     ` [PATCH] dma: fix platform_no_drv_owner.cocci warnings kbuild test robot
2015-10-30 15:00     ` [PATCH 1/2] dma: add Qualcomm Technologies HIDMA management driver Mark Rutland
2015-10-30 17:59       ` Andy Shevchenko
     [not found]         ` <CAHp75VdHxGC841cFY3M+ujZKSX04nT4+7gc3iKsgwzLRC4AYWQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-10-30 18:08           ` Sinan Kaya
2015-10-30 18:18             ` Mark Rutland
     [not found]             ` <5633B207.5030505-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2015-10-30 18:18               ` Andy Shevchenko
2015-10-30 18:25                 ` Mark Rutland
2015-10-30 18:40                   ` Andy Shevchenko
     [not found]                     ` <CAHp75Vd-z22XJboxQ=CMxDQ9UaTatbCmpAPLO0jPM0FwJadBOg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-10-30 18:48                       ` Sinan Kaya
     [not found]                         ` <5633BB66.3070505-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2015-10-30 19:01                           ` Mark Rutland
2015-10-30 20:08                             ` Al Stone
     [not found]                               ` <5633CE23.7060303-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
2015-10-30 20:15                                 ` Andy Shevchenko
2015-10-30 20:18                                   ` Mark Rutland
     [not found]                                   ` <CAHp75VcQ6r2FGqsP2mtnv95etCGJmeQ=T7aKSB5H3cvwhdSbDw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-10-31  3:33                                     ` Jon Masters
2015-10-31 17:34                                       ` Sinan Kaya
2015-10-30 19:36                   ` Sinan Kaya
2015-10-31 17:11       ` Sinan Kaya
2015-10-30  9:34 ` Arnd Bergmann
2015-10-31  6:51   ` Sinan Kaya
2015-10-31 12:53     ` Timur Tabi
2015-10-31 12:53     ` Timur Tabi
2015-11-02 21:30     ` Arnd Bergmann
2015-11-03  4:45       ` Sinan Kaya
2015-11-03 12:42         ` Arnd Bergmann
2015-11-03 14:26           ` Timur Tabi
2015-11-04  1:04           ` Sinan Kaya

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