From: Michael Jones <michael.jones@matrix-vision.de>
To: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc: Linux Media Mailing List <linux-media@vger.kernel.org>
Subject: omap3isp buffer alignment
Date: Thu, 11 Aug 2011 11:57:04 +0200 [thread overview]
Message-ID: <4E43A770.7080308@matrix-vision.de> (raw)
Hi Laurent,
If I understood your discussion with Russell [1] correctly, user pointer
buffers are required to be page-aligned because of the IOMMU API, and
it's desirable to keep the IOMMU driver that way for other subsystems
which may use it. So we're stuck with user buffers needing to be
page-aligned.
There's a check in ispvideo.c:isp_video_buffer_prepare() that the buffer
address is 32-byte aligned. Isn't this superfluous considering the
page-aligned restriction?
-Michael
[1]
http://www.mail-archive.com/linux-omap%40vger.kernel.org/msg50611.html
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next reply other threads:[~2011-08-11 9:57 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-08-11 9:57 Michael Jones [this message]
2011-08-11 21:21 ` omap3isp buffer alignment Sakari Ailus
2011-08-12 9:28 ` Laurent Pinchart
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