From: Sinan Kaya <okaya@codeaurora.org>
To: Arnd Bergmann <arnd@arndb.de>
Cc: dmaengine@vger.kernel.org, timur@codeaurora.org,
cov@codeaurora.org, jcm@redhat.com,
Rob Herring <robh+dt@kernel.org>, Pawel Moll <pawel.moll@arm.com>,
Mark Rutland <mark.rutland@arm.com>,
Ian Campbell <ijc+devicetree@hellion.org.uk>,
Kumar Gala <galak@codeaurora.org>,
Vinod Koul <vinod.koul@intel.com>,
Dan Williams <dan.j.williams@intel.com>,
devicetree@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 2/2] dma: add Qualcomm Technologies HIDMA channel driver
Date: Tue, 3 Nov 2015 00:29:07 -0500 [thread overview]
Message-ID: <56384623.80305@codeaurora.org> (raw)
In-Reply-To: <17979873.Bg2pv5SLy6@wuerfel>
On 11/2/2015 3:55 PM, Arnd Bergmann wrote:
> Are you using message signaled interrupts then?
> Typically MSI guarantees
> ordering against DMA, but level or edge triggered interrupts by definition
> cannot (at least on PCI, but most other buses are the same way), because
> the DMA master has no insight into when a DMA is actually complete.
>
> If you use MSI, please add a comment to the readl_relaxed() that it
> is safe because of that, otherwise the next person who tries to debug
> a problem with your driver has to look into this.
No, using regular GIC SPI interrupts at this moment. I know that HW
doesn't use any of the typical AHB/AXI ARM buses.
I'm familiar with how PCI endpoints works. While the first read in a
typical PCI endpoint ISR flushes all outstanding requests traditionally
to the destination, this concept does not apply here for this HW.
--
Sinan Kaya
Qualcomm Technologies, Inc. on behalf of Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a
Linux Foundation Collaborative Project
next prev parent reply other threads:[~2015-11-03 5:29 UTC|newest]
Thread overview: 80+ 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 ` 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
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 8:07 ` kbuild test robot
2015-10-30 14:50 ` Mark Rutland
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
2015-10-30 21:42 ` Sinan Kaya
[not found] ` <5633E442.3010003-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2015-10-30 21:55 ` Timur Tabi
2015-10-30 21:55 ` Timur Tabi
[not found] ` <5633E744.6040202-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2015-10-30 22:47 ` Arnd Bergmann
2015-10-30 22:47 ` Arnd Bergmann
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
2015-11-01 18:50 ` Sinan Kaya
[not found] ` <56365F0D.6010508-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2015-11-01 20:21 ` Timur Tabi
2015-11-01 20:21 ` Timur Tabi
[not found] ` <56367433.60806-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2015-11-01 20:27 ` Sinan Kaya
2015-11-01 20:27 ` Sinan Kaya
2015-11-02 16:33 ` Arnd Bergmann
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
2015-11-02 20:55 ` Arnd Bergmann
2015-11-03 5:29 ` Sinan Kaya [this message]
2015-11-03 10:43 ` Arnd Bergmann
2015-11-03 21:07 ` Sinan Kaya
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
2015-10-30 4:34 ` 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 4:34 ` kbuild test robot
2015-10-30 15:00 ` [PATCH 1/2] dma: add Qualcomm Technologies HIDMA management driver Mark Rutland
2015-10-30 15:00 ` Mark Rutland
2015-10-30 17:59 ` Andy Shevchenko
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 18:08 ` 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 18:18 ` Andy Shevchenko
2015-10-30 18:25 ` Mark Rutland
2015-10-30 18:25 ` Mark Rutland
2015-10-30 18:40 ` Andy Shevchenko
2015-10-30 18:40 ` Andy Shevchenko
[not found] ` <CAHp75Vd-z22XJboxQ=CMxDQ9UaTatbCmpAPLO0jPM0FwJadBOg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-10-30 18:48 ` Sinan Kaya
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 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 20:15 ` 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 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 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 4:45 ` Sinan Kaya
2015-11-03 12:42 ` Arnd Bergmann
2015-11-03 14:26 ` Timur Tabi
2015-11-03 14:26 ` Timur Tabi
2015-11-04 1:04 ` Sinan Kaya
2015-11-04 1:04 ` Sinan Kaya
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