From: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
To: Chen-Yu Tsai <wens@csie.org>
Cc: Linux Media Mailing List <linux-media@vger.kernel.org>,
devicetree <devicetree@vger.kernel.org>,
linux-kernel <linux-kernel@vger.kernel.org>,
linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
devel@driverdev.osuosl.org,
Mauro Carvalho Chehab <mchehab@kernel.org>,
Rob Herring <robh+dt@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
Maxime Ripard <maxime.ripard@bootlin.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
linux-sunxi@googlegroups.com, Hans Verkuil <hverkuil@xs4all.nl>,
Sakari Ailus <sakari.ailus@linux.intel.com>,
Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Subject: Re: [linux-sunxi] [PATCH 14/15] arm64: dts: allwinner: h5: Add Video Engine and reserved memory node
Date: Fri, 30 Nov 2018 14:16:50 +0100 [thread overview]
Message-ID: <2a52719446c1050990494e44a991acb932da8273.camel@bootlin.com> (raw)
In-Reply-To: <CAGb2v64pVKG4mSAF48xR54yj00rQ6iTvgYQB9Bf-XWmH2FhVqQ@mail.gmail.com>
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Hi,
On Thu, 2018-11-15 at 23:35 +0800, Chen-Yu Tsai wrote:
> On Thu, Nov 15, 2018 at 10:51 PM Paul Kocialkowski
> <paul.kocialkowski@bootlin.com> wrote:
> > This adds nodes for the Video Engine and the associated reserved memory
> > for the H5. Up to 96 MiB of memory are dedicated to the CMA pool.
> >
> > The pool is located at the end of the first 256 MiB of RAM so that the
> > VPU can access it. It is unclear whether this is still a hard
> > requirement for this platform, but it seems safer that way.
>
> I think we can actually test this. You could move the reserved memory
> pool beyond 256 MiB, and have cedrus decode stuff, and try to display
> the results. If it's gibberish, or the system crashes, it's likely the
> memory access wrapped around at 256 MiB.
>
> What do you think?
I did the test on various platforms and found that starting with the
A33, the VPU can map any address in RAM! SO we shouldn't need reserved
memory nodes for these devices after all.
Cheers,
Paul
--
Paul Kocialkowski, Bootlin (formerly Free Electrons)
Embedded Linux and kernel engineering
https://bootlin.com
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next prev parent reply other threads:[~2018-11-30 13:16 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-15 14:49 [PATCH 00/15] Cedrus support for the Allwinner H5 and A64 platforms Paul Kocialkowski
2018-11-15 14:49 ` [PATCH 01/15] ARM: dts: sun8i-a33: Remove heading 0 in video-codec unit address Paul Kocialkowski
2018-11-15 15:50 ` Chen-Yu Tsai
2018-11-16 9:59 ` Paul Kocialkowski
2018-11-15 14:50 ` [PATCH 02/15] ARM: dts: sun8i-h3: " Paul Kocialkowski
2018-11-15 15:50 ` Chen-Yu Tsai
2018-11-15 14:50 ` [PATCH 03/15] ARM: dts: sun8i-h3: Fix the system-control register range Paul Kocialkowski
2018-11-15 15:51 ` Chen-Yu Tsai
2018-11-15 14:50 ` [PATCH 04/15] soc: sunxi: sram: Enable EMAC clock access for H3 variant Paul Kocialkowski
2018-11-15 15:53 ` Chen-Yu Tsai
2018-11-15 14:50 ` [PATCH 05/15] dt-bindings: sram: sunxi: Add bindings for the H5 with SRAM C1 Paul Kocialkowski
2018-12-04 21:46 ` Rob Herring
2018-11-15 14:50 ` [PATCH 06/15] soc: sunxi: sram: Add support for the H5 SoC system control Paul Kocialkowski
2018-11-15 14:50 ` [PATCH 07/15] arm64: dts: allwinner: h5: Add system-control node with SRAM C1 Paul Kocialkowski
2018-11-15 16:52 ` Chen-Yu Tsai
2018-11-30 3:38 ` Chen-Yu Tsai
2018-11-30 13:26 ` Paul Kocialkowski
2018-11-15 14:50 ` [PATCH 08/15] ARM/arm64: sunxi: Move H3/H5 syscon label over to soc-specific nodes Paul Kocialkowski
2018-11-16 9:39 ` Maxime Ripard
2018-11-16 9:47 ` Chen-Yu Tsai
2018-11-16 9:56 ` Paul Kocialkowski
2018-11-16 16:39 ` Maxime Ripard
2018-11-15 14:50 ` [PATCH 09/15] dt-bindings: sram: sunxi: Add compatible for the A64 SRAM C1 Paul Kocialkowski
2018-12-04 21:47 ` Rob Herring
2018-11-15 14:50 ` [PATCH 10/15] arm64: dts: allwinner: a64: Add support for the SRAM C1 section Paul Kocialkowski
2018-11-15 16:39 ` Chen-Yu Tsai
2018-11-15 14:50 ` [PATCH 11/15] dt-bindings: media: cedrus: Add compatibles for the A64 and H5 Paul Kocialkowski
2018-12-04 21:47 ` Rob Herring
2018-11-15 14:50 ` [PATCH 12/15] media: cedrus: Add device-tree compatible and variant for H5 support Paul Kocialkowski
2018-11-15 14:50 ` [PATCH 13/15] media: cedrus: Add device-tree compatible and variant for A64 support Paul Kocialkowski
2018-11-15 14:50 ` [PATCH 14/15] arm64: dts: allwinner: h5: Add Video Engine and reserved memory node Paul Kocialkowski
2018-11-15 15:35 ` [linux-sunxi] " Chen-Yu Tsai
2018-11-30 13:16 ` Paul Kocialkowski [this message]
2018-11-15 14:50 ` [PATCH 15/15] arm64: dts: allwinner: a64: " Paul Kocialkowski
2018-11-16 9:41 ` Maxime Ripard
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