From: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
To: Tomi Valkeinen <tomi.valkeinen@ti.com>
Cc: Peter Ujfalusi <peter.ujfalusi@ti.com>,
devicetree@vger.kernel.org, jsarha@ti.com,
dri-devel@lists.freedesktop.org
Subject: Re: [PATCH v2 2/2] drm/omap: partial workaround for DRA7xx DMM errata i878
Date: Wed, 04 Apr 2018 12:51:19 +0300 [thread overview]
Message-ID: <4932838.akKzjW5mjy@avalon> (raw)
In-Reply-To: <ec0847aa-3883-a9f2-6005-47654df27205@ti.com>
Hi Tomi,
On Wednesday, 4 April 2018 10:37:05 EEST Tomi Valkeinen wrote:
> On 04/04/18 00:11, Laurent Pinchart wrote:
> > I assume access to DMM-mapped buffers to be way more frequent than access
> > to the DMM registers. If that's the case, this partial workaround should
> > only slightly lower the probability of system lock-up. Do you have plans
> > to implement a workaround that will fix the problem completely ?
>
> CPU only accesses memory via DMM when using TILER 2D buffers, which are
> not officially supported. For non-2D, the pages are mapped directly to
> the CPU without DMM in between.
What is the DMM used for with non-2D then ? Does it need to be setup at all ?
--
Regards,
Laurent Pinchart
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next prev parent reply other threads:[~2018-04-04 9:51 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-03-22 13:42 [PATCH v2 0/2] drm/omap: Workaround for errata i878 Peter Ujfalusi
2018-03-22 13:42 ` [PATCH v2 1/2] dt-bindings: arm: omap: dmm: Document new compatible for DRA7xx family Peter Ujfalusi
2018-03-23 8:31 ` Peter Ujfalusi
2018-04-03 20:48 ` Laurent Pinchart
2018-03-26 22:24 ` Rob Herring
2018-04-03 20:44 ` Laurent Pinchart
2018-03-22 13:42 ` [PATCH v2 2/2] drm/omap: partial workaround for DRA7xx DMM errata i878 Peter Ujfalusi
2018-03-23 8:32 ` Peter Ujfalusi
2018-03-29 10:18 ` Tomi Valkeinen
2018-03-29 12:11 ` Peter Ujfalusi
2018-04-03 21:11 ` Laurent Pinchart
2018-04-04 7:37 ` Tomi Valkeinen
2018-04-04 9:51 ` Laurent Pinchart [this message]
2018-04-04 10:02 ` Tomi Valkeinen
2018-04-04 10:28 ` Laurent Pinchart
2018-04-04 10:33 ` Tomi Valkeinen
2018-04-04 11:17 ` Laurent Pinchart
2018-04-04 10:50 ` Tomi Valkeinen
2018-04-04 11:08 ` Laurent Pinchart
2018-04-10 6:50 ` Peter Ujfalusi
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