dmaengine Archive on lore.kernel.org
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From: Sven Van Asbroeck <thesven73@gmail.com>
To: Fabio Estevam <festevam@gmail.com>
Cc: Robin Gong <yibin.gong@nxp.com>, Shawn Guo <shawnguo@kernel.org>,
	Sascha Hauer <s.hauer@pengutronix.de>, Vinod <vkoul@kernel.org>,
	Dan Williams <dan.j.williams@intel.com>,
	NXP Linux Team <linux-imx@nxp.com>,
	"moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
	<linux-arm-kernel@lists.infradead.org>,
	dmaengine@vger.kernel.org, Sascha Hauer <kernel@pengutronix.de>,
	Michael Olbrich <m.olbrich@pengutronix.de>
Subject: Re: [PATCH v1] dmaengine: imx-sdma: remove BD_INTR for channel0
Date: Fri, 14 Jun 2019 09:25:51 -0400
Message-ID: <CAGngYiUWy5FM-zsT55-yY=kahLObZGYw=zU0F9Tzp9T2S3G6LA@mail.gmail.com> (raw)
In-Reply-To: <CAOMZO5Do+BsZEX43w283yWed8fQVtTC+zAvoktPLTj4c_f798w@mail.gmail.com>

On Fri, Jun 14, 2019 at 6:49 AM Fabio Estevam <festevam@gmail.com> wrote:
>
> According to the original report from Sven the issue started to happen
> on 5.0, so it would be good to add a Fixes tag and Cc stable so that
> this fix could be backported to 5.0/5.1 stable trees.

Good catch !

However, the issue is highly timing-dependent. It will come and go depending
on the kernel version, devicetree and defconfig. If it works for me on
4.19, that
doesn't mean the bug is gone on 4.19.

Looking at the commit history, I think the commit below possibly introduced the
issue. Until this commit, sdma_run_channel() would wait on the interrupt
before proceeding. It has been there since 4.8:

Fixes: 1d069bfa3c78 ("dmaengine: imx-sdma: ack channel 0 IRQ in the
interrupt handler")

But my knowledge of imx-sdma is non-existent, so I invite the more knowledgeable
people in this thread to take a look at this commit.

[Adding Michael Olbrich to the thread]

  reply index

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-14  8:39 yibin.gong
2019-06-14 10:49 ` Fabio Estevam
2019-06-14 13:25   ` Sven Van Asbroeck [this message]
2019-06-14 18:09     ` Michael Olbrich
2019-06-17  2:14       ` Robin Gong
2019-06-17 10:15         ` m.olbrich
2019-06-18  6:08           ` Robin Gong
2019-06-17  2:02     ` Robin Gong
2019-06-17 13:27       ` Sven Van Asbroeck
2019-06-18  5:50         ` Robin Gong
2019-06-14 13:35 ` Sven Van Asbroeck
2019-06-17  1:42   ` Robin Gong

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