LKML Archive on lore.kernel.org
 help / color / Atom feed
From: Bjorn Andersson <bjorn.andersson@linaro.org>
To: Stephen Boyd <swboyd@chromium.org>, vivek.gautam@codeaurora.org
Cc: Andy Gross <agross@kernel.org>,
	linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org,
	Sibi Sankar <sibis@codeaurora.org>
Subject: Re: [PATCH] arm64: dts: sdm845: Add iommus property to qup1
Date: Tue, 4 Jun 2019 15:59:31 -0700
Message-ID: <20190604225931.GG4814@minitux> (raw)
In-Reply-To: <5cf6f4bb.1c69fb81.c39da.5496@mx.google.com>

On Tue 04 Jun 15:46 PDT 2019, Stephen Boyd wrote:

> Quoting Bjorn Andersson (2019-06-04 15:37:00)
> > On Tue 04 Jun 15:29 PDT 2019, Stephen Boyd wrote:
> > 
> > > The SMMU that sits in front of the QUP needs to be programmed properly
> > > so that the i2c geni driver can allocate DMA descriptors. Failure to do
> > > this leads to faults when using devices such as an i2c touchscreen where
> > > the transaction is larger than 32 bytes and we use a DMA buffer.
> > > 
> > 
> > I'm pretty sure I've run into this problem, but before we marked the
> > smmu bypass_disable and as such didn't get the fault, thanks.
> > 
> > >  arm-smmu 15000000.iommu: Unexpected global fault, this could be serious
> > >  arm-smmu 15000000.iommu:         GFSR 0x00000002, GFSYNR0 0x00000002, GFSYNR1 0x000006c0, GFSYNR2 0x00000000
> > > 
> > > Add the right SID and mask so this works.
> > > 
> > > Cc: Sibi Sankar <sibis@codeaurora.org>
> > > Signed-off-by: Stephen Boyd <swboyd@chromium.org>
> > > ---
> > >  arch/arm64/boot/dts/qcom/sdm845.dtsi | 1 +
> > >  1 file changed, 1 insertion(+)
> > > 
> > > diff --git a/arch/arm64/boot/dts/qcom/sdm845.dtsi b/arch/arm64/boot/dts/qcom/sdm845.dtsi
> > > index fcb93300ca62..2e57e861e17c 100644
> > > --- a/arch/arm64/boot/dts/qcom/sdm845.dtsi
> > > +++ b/arch/arm64/boot/dts/qcom/sdm845.dtsi
> > > @@ -900,6 +900,7 @@
> > >                       #address-cells = <2>;
> > >                       #size-cells = <2>;
> > >                       ranges;
> > > +                     iommus = <&apps_smmu 0x6c0 0x3>;
> > 
> > According to the docs this stream belongs to TZ, the HLOS stream should
> > be 0x6c3.
> 
> Aye, I saw this line in the downstream kernel but it doesn't work for
> me. If I specify <&apps_smmu 0x6c3 0x0> it still blows up. I wonder if
> my firmware perhaps is missing some initialization here to make the QUP
> operate in HLOS mode? Otherwise, I thought that the 0x3 at the end was
> the mask and so it should be split off to the second cell in the DT
> specifier but that seemed a little weird.
> 

Both 0x3 and 0x6c3 are documented as the actual HLOS stream id, with
mask of 0x0. 

Looping in Vivek as well.

Regards,
Bjorn

  reply index

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-04 22:29 Stephen Boyd
2019-06-04 22:37 ` Bjorn Andersson
2019-06-04 22:46   ` Stephen Boyd
2019-06-04 22:59     ` Bjorn Andersson [this message]
2019-06-05  4:55     ` Vivek Gautam
2019-06-05 20:56       ` Stephen Boyd
2019-06-06 11:17         ` Vivek Gautam
2019-06-06 14:12           ` Marc Gonzalez
2019-06-10 23:21           ` Stephen Boyd
2019-06-12  9:26             ` Vivek Gautam
2019-07-16 23:47               ` Stephen Boyd
2019-06-04 22:48   ` Doug Anderson
2019-06-04 22:56     ` Bjorn Andersson

Reply instructions:

You may reply publically 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=20190604225931.GG4814@minitux \
    --to=bjorn.andersson@linaro.org \
    --cc=agross@kernel.org \
    --cc=linux-arm-msm@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=sibis@codeaurora.org \
    --cc=swboyd@chromium.org \
    --cc=vivek.gautam@codeaurora.org \
    /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

LKML Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/lkml/0 lkml/git/0.git
	git clone --mirror https://lore.kernel.org/lkml/1 lkml/git/1.git
	git clone --mirror https://lore.kernel.org/lkml/2 lkml/git/2.git
	git clone --mirror https://lore.kernel.org/lkml/3 lkml/git/3.git
	git clone --mirror https://lore.kernel.org/lkml/4 lkml/git/4.git
	git clone --mirror https://lore.kernel.org/lkml/5 lkml/git/5.git
	git clone --mirror https://lore.kernel.org/lkml/6 lkml/git/6.git
	git clone --mirror https://lore.kernel.org/lkml/7 lkml/git/7.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 lkml lkml/ https://lore.kernel.org/lkml \
		linux-kernel@vger.kernel.org linux-kernel@archiver.kernel.org
	public-inbox-index lkml


Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.linux-kernel


AGPL code for this site: git clone https://public-inbox.org/ public-inbox