linux-kernel.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Roger Quadros <rogerq@ti.com>
To: Rob Herring <robh+dt@kernel.org>
Cc: "Christoph Hellwig" <hch@lst.de>,
	"Robin Murphy" <robin.murphy@arm.com>,
	"Péter Ujfalusi" <peter.ujfalusi@ti.com>,
	"Murali Karicheri" <m-karicheri2@ti.com>,
	"Nori, Sekhar" <nsekhar@ti.com>, "Anna, Suman" <s-anna@ti.com>,
	"Stefan Wahren" <stefan.wahren@i2se.com>,
	"Andreas Färber" <afaerber@suse.de>,
	"Hans Verkuil" <hverkuil@xs4all.nl>,
	devicetree@vger.kernel.org,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"Nishanth Menon" <nm@ti.com>,
	"hdegoede@redhat.com" <hdegoede@redhat.com>,
	"Vignesh Raghavendra" <vigneshr@ti.com>
Subject: Re: dma_mask limited to 32-bits with OF platform device
Date: Wed, 19 Feb 2020 16:29:20 +0200	[thread overview]
Message-ID: <15d0ac5f-4919-5852-cd95-93c24d8bdbb9@ti.com> (raw)
In-Reply-To: <CAL_JsqLxECRKWG3SoORADtZ-gVbqCHyx9mhGzrCPO+X=--w8AQ@mail.gmail.com>

Rob,

On 18/02/2020 19:22, Rob Herring wrote:
> On Tue, Feb 18, 2020 at 2:28 AM Roger Quadros <rogerq@ti.com> wrote:
>>
>> Chrishtoph,
>>
>> The branch works fine for SATA on DRA7 with CONFIG_LPAE once I
>> have the below DT fix.
>>
>> Do you intend to send these fixes to -stable?
>>
>> ------------------------- arch/arm/boot/dts/dra7.dtsi -------------------------
>> index d78b684e7fca..853ecf3cfb37 100644
>> @@ -645,6 +645,8 @@
>>                  sata: sata@4a141100 {
>>                          compatible = "snps,dwc-ahci";
>>                          reg = <0x4a140000 0x1100>, <0x4a141100 0x7>;
>> +                       #size-cells = <2>;
>> +                       dma-ranges = <0x00000000 0x00000000 0x1 0x00000000>;
> 
> dma-ranges should be in the parent (bus) node, not the device node.

I didn't understand why.

There are many devices on the parent bus node and all devices might not have the 32-bit DMA limit
the SATA controller has.

SATA controller is the bus master and the ATA devices are children of the SATA controller.

 From Documentation/devicetree/booting-without-of.txt

* DMA Bus master
Optional property:
- dma-ranges: <prop-encoded-array> encoded as arbitrary number of triplets of
         (child-bus-address, parent-bus-address, length). Each triplet specified
         describes a contiguous DMA address range.
         The dma-ranges property is used to describe the direct memory access (DMA)
         structure of a memory-mapped bus whose device tree parent can be accessed
         from DMA operations originating from the bus. It provides a means of
         defining a mapping or translation between the physical address space of
         the bus and the physical address space of the parent of the bus.
         (for more information see the Devicetree Specification)

* DMA Bus child
Optional property:
- dma-ranges: <empty> value. if present - It means that DMA addresses
         translation has to be enabled for this device.
- dma-coherent: Present if dma operations are coherent



> 
>>                          interrupts = <GIC_SPI 49 IRQ_TYPE_LEVEL_HIGH>;
>>                          phys = <&sata_phy>;
>>                          phy-names = "sata-phy";
>>
>>
>> cheers,
>> -roger
>>
>> On 17/02/2020 15:21, Christoph Hellwig wrote:
>>> Roger,
>>>
>>> can you try the branch below and check if that helps?
>>>
>>>       git://git.infradead.org/users/hch/misc.git arm-dma-bus-limit
>>>
>>> Gitweb:
>>>
>>>       http://git.infradead.org/users/hch/misc.git/shortlog/refs/heads/arm-dma-bus-limit
>>>
>>
>> --
>> Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
>> Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki

-- 
cheers,
-roger
Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki

  reply	other threads:[~2020-02-19 14:29 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-12 10:49 Roger Quadros
2020-02-12 11:37 ` Robin Murphy
2020-02-12 12:33   ` Roger Quadros
2020-02-12 14:04     ` Robin Murphy
2020-02-12 17:57       ` Christoph Hellwig
2020-02-17 13:21       ` Christoph Hellwig
2020-02-17 14:54         ` Peter Ujfalusi
2020-02-18  7:26           ` Peter Ujfalusi
2020-02-18  8:28         ` Roger Quadros
2020-02-18 17:22           ` Rob Herring
2020-02-19 14:29             ` Roger Quadros [this message]
2020-02-19 15:25               ` Robin Murphy
2020-02-19 15:40                 ` Roger Quadros
2020-02-26 11:33                 ` Roger Quadros
2020-03-03  8:27                   ` Roger Quadros
2020-03-03 14:06                     ` Robin Murphy
2020-03-03 19:26                       ` Rob Herring
2020-03-04  8:28                         ` Roger Quadros

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=15d0ac5f-4919-5852-cd95-93c24d8bdbb9@ti.com \
    --to=rogerq@ti.com \
    --cc=afaerber@suse.de \
    --cc=devicetree@vger.kernel.org \
    --cc=hch@lst.de \
    --cc=hdegoede@redhat.com \
    --cc=hverkuil@xs4all.nl \
    --cc=linux-kernel@vger.kernel.org \
    --cc=m-karicheri2@ti.com \
    --cc=nm@ti.com \
    --cc=nsekhar@ti.com \
    --cc=peter.ujfalusi@ti.com \
    --cc=robh+dt@kernel.org \
    --cc=robin.murphy@arm.com \
    --cc=s-anna@ti.com \
    --cc=stefan.wahren@i2se.com \
    --cc=vigneshr@ti.com \
    --subject='Re: dma_mask limited to 32-bits with OF platform device' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).