dmaengine Archive on lore.kernel.org
 help / color / Atom feed
From: "Jan Lübbe" <jlu@pengutronix.de>
To: Philipp Puschmann <philipp.puschmann@emlix.com>,
	Adam Ford <aford173@gmail.com>
Cc: fugang.duan@nxp.com, Shawn Guo <shawnguo@kernel.org>,
	Sascha Hauer <s.hauer@pengutronix.de>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	vkoul@kernel.org, NXP Linux Team <linux-imx@nxp.com>,
	Sascha Hauer <kernel@pengutronix.de>,
	dmaengine@vger.kernel.org, dan.j.williams@intel.com,
	Robin Gong <yibin.gong@nxp.com>,
	Fabio Estevam <festevam@gmail.com>,
	arm-soc <linux-arm-kernel@lists.infradead.org>,
	Lucas Stach <l.stach@pengutronix.de>
Subject: Re: [PATCH v5 0/3] Fix UART DMA freezes for i.MX SOCs
Date: Mon, 23 Sep 2019 17:09:35 +0200
Message-ID: <8cc51d485ee016589b752426412e57c23e35a4cc.camel@pengutronix.de> (raw)
In-Reply-To: <2443c553-c593-2f23-4cca-c2f03676adc9@emlix.com>

On Mon, 2019-09-23 at 17:06 +0200, Philipp Puschmann wrote:
> Thanks for testing.
> With my local setup i still have very few tx timeouts too. But i think they have a different
> cause and especially different consequences. When the problem addressed by this series
> appear you get a whole bunch of tx timeouts (and maybe errors from Bluetooth
> layer) and monitoring received Bluetooth packets with hciconfig shows a
> complete freeze of rx counter. Only resetting the hci_uart driver and the wl1837mon then helps.
> With these patches applied the rx data shold still coming in even if a single or
> multiple tx timeout error happen. I'm not sure where the error comes from and what the
> consequences for the Bluetooth layer are.

For testing, I've used a UART connected to my development host and
configured *mismatching* baud rates. Sending /dev/urandom from the host
to the i.MX6 then triggered the DMA hang (because each character
triggers and error indication, which "uses" a full buffer).

Regards,
Jan
-- 
Pengutronix e.K.                           |                             |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |


      reply index

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-23 13:58 Philipp Puschmann
2019-09-23 13:58 ` [PATCH v5 1/3] dmaengine: imx-sdma: fix buffer ownership Philipp Puschmann
2019-12-03  9:47   ` Lucas Stach
2019-12-04  9:19   ` Robin Gong
2019-12-10  9:44     ` Philipp Puschmann
2019-12-10 13:01       ` Robin Gong
2019-09-23 13:58 ` [PATCH v5 2/3] dmaengine: imx-sdma: fix dma freezes Philipp Puschmann
2019-09-24  3:14   ` Robin Gong
2019-09-23 13:58 ` [PATCH v5 3/3] dmaengine: imx-sdma: drop redundant variable Philipp Puschmann
2019-09-23 14:55 ` [PATCH v5 0/3] Fix UART DMA freezes for i.MX SOCs Adam Ford
2019-09-23 15:06   ` Philipp Puschmann
2019-09-23 15:09     ` Jan Lübbe [this message]

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=8cc51d485ee016589b752426412e57c23e35a4cc.camel@pengutronix.de \
    --to=jlu@pengutronix.de \
    --cc=aford173@gmail.com \
    --cc=dan.j.williams@intel.com \
    --cc=dmaengine@vger.kernel.org \
    --cc=festevam@gmail.com \
    --cc=fugang.duan@nxp.com \
    --cc=kernel@pengutronix.de \
    --cc=l.stach@pengutronix.de \
    --cc=linux-arm-kernel@lists.infradead.org \
    --cc=linux-imx@nxp.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=philipp.puschmann@emlix.com \
    --cc=s.hauer@pengutronix.de \
    --cc=shawnguo@kernel.org \
    --cc=vkoul@kernel.org \
    --cc=yibin.gong@nxp.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

dmaengine Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/dmaengine/0 dmaengine/git/0.git

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

Example config snippet for mirrors

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


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