From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
To: Curtis Malainey <cujomalainey@google.com>
Cc: Ross Zwisler <zwisler@google.com>,
Fletcher Woodruff <fletcherw@google.com>,
dmaengine@vger.kernel.org, alsa-devel@alsa-project.org,
Pierre-louis Bossart <pierre-louis.bossart@intel.com>,
Liam Girdwood <liam.r.girdwood@intel.com>
Subject: Re: DW-DMA: Probe failures on broadwell
Date: Tue, 9 Jul 2019 16:14:01 +0300 [thread overview]
Message-ID: <20190709131401.GA9224@smile.fi.intel.com> (raw)
In-Reply-To: <CAOReqxhxHiJ-4UYC-j4Quuuy5YP9ywohe_JwiLpCxqCvP-7ypg@mail.gmail.com>
(I think this is okay to go on public here)
+Cc: Pierre, Liam, DMA Engine ML, ASoC ML
On Mon, Jul 08, 2019 at 01:50:07PM -0700, Curtis Malainey wrote:
> Hello Andy,
>
> I am reaching out to you as you are the main author for
> drivers/dma/dw/core.c and we are seeing a failure in there on some of
> our samus devices. On certain device we are seeing the following
> failure (debugging enabled in this log.)
>
> [ 3.587515] sst-acpi INT3438:00: DW_PARAMS: 0x00000000
AFAIK, when Synopsys DesignWare DMA IP is in use in Intel, we almost always
(yes, I know couple of exceptions), enable auto configuration block. Thus, the
*private* DMA controllers used in Broadwell are actually Intel iDMA 32-bit.
Nowadays the differences can be seen in drivers/dma/dw/idma32.c.
Note, DMA in the driver is used solely for firmware load, simplest workaround
is to disable DMA. Though, personally, for sake of test coverage, I would like
to see how it works in DMA case.
> [ 3.587519] haswell-pcm-audio haswell-pcm-audio: error: DMA device
> register failed
> [ 3.587524] haswell-pcm-audio haswell-pcm-audio: sst_dma_new failed -22
> [ 3.598010] bdw-rt5677 bdw-rt5677: ASoC: failed to init link System PCM
>
> I don't have the datasheets for this component but I am wondering if
> you could help us troubleshoot this bug it would be greatly
> appreciated if possible. I am not sure if we are seeing a hardware
> boot failure or a boot race. I was hoping you could shed some light on
> this and if it is a boot race help us recover from it. I know Intel
> relies on no defers typically but it would be nice to see if we can
> fix this. Below is where I have traced the error source to in core.c.
So, the correct fix is to provide a platform data, like it's done in
drivers/dma/dw/pci.c::idma32_pdata, in the sst-firmware.c::dw_probe(), and call
idma32_dma_probe() with idma32_dma_remove() respectively on removal stage.
(It will require latest patches to be applied, which are material for v5.x)
> dw_params = dma_readl(dw, DW_PARAMS);
> dev_dbg(chip->dev, "DW_PARAMS: 0x%08x\n", dw_params);
>
> autocfg = dw_params >> DW_PARAMS_EN & 1;
> if (!autocfg) {
> err = -EINVAL;
> goto err_pdata;
> }
> Let me know if you have any ideas on how to mitigate this, thanks.
--
With Best Regards,
Andy Shevchenko
next parent reply other threads:[~2019-07-09 13:14 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CAOReqxhxHiJ-4UYC-j4Quuuy5YP9ywohe_JwiLpCxqCvP-7ypg@mail.gmail.com>
2019-07-09 13:14 ` Andy Shevchenko [this message]
2019-07-09 13:29 ` DW-DMA: Probe failures on broadwell Andy Shevchenko
2019-07-09 13:34 ` Andy Shevchenko
2019-07-09 13:38 ` Andy Shevchenko
2019-07-09 19:27 ` Curtis Malainey
2019-07-10 16:43 ` Andy Shevchenko
2019-07-10 21:24 ` Curtis Malainey
2019-07-11 13:12 ` Andy Shevchenko
2019-07-11 18:15 ` Curtis Malainey
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=20190709131401.GA9224@smile.fi.intel.com \
--to=andriy.shevchenko@linux.intel.com \
--cc=alsa-devel@alsa-project.org \
--cc=cujomalainey@google.com \
--cc=dmaengine@vger.kernel.org \
--cc=fletcherw@google.com \
--cc=liam.r.girdwood@intel.com \
--cc=pierre-louis.bossart@intel.com \
--cc=zwisler@google.com \
/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
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
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).