linux-kernel - Re: [PATCH v3 2/5] media: hantro: Reduce H264 extra space for motion vectors

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Date:   Mon, 09 Dec 2019 15:11:41 -0300
From:   Ezequiel Garcia <ezequiel@...labora.com>
To:     Tomasz Figa <tfiga@...omium.org>, Jonas Karlman <jonas@...boo.se>
Cc:     Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        Hans Verkuil <hverkuil@...all.nl>,
        Boris Brezillon <boris.brezillon@...labora.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        "linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 2/5] media: hantro: Reduce H264 extra space for
 motion vectors

On Wed, 2019-11-20 at 21:44 +0900, Tomasz Figa wrote:
> Hi Jonas,
> 
> On Thu, Nov 7, 2019 at 7:34 AM Jonas Karlman <jonas@...boo.se> wrote:
> > A decoded 8-bit 4:2:0 frame need memory for up to 448 bytes per
> > macroblock with additional 32 bytes on multi-core variants.
> > 
> > Memory layout is as follow:
> > 
> > +---------------------------+
> > > Y-plane   256 bytes x MBs |
> > +---------------------------+
> > > UV-plane  128 bytes x MBs |
> > +---------------------------+
> > > MV buffer  64 bytes x MBs |
> > +---------------------------+
> > > MC sync          32 bytes |
> > +---------------------------+
> > 
> > Reduce the extra space allocated now that motion vector buffer offset no
> > longer is based on the extra space.
> > 
> > Only allocate extra space for 64 bytes x MBs of motion vector buffer
> > and 32 bytes for multi-core sync.
> > 
> > Fixes: a9471e25629b ("media: hantro: Add core bits to support H264 decoding")
> > Signed-off-by: Jonas Karlman <jonas@...boo.se>
> > Reviewed-by: Boris Brezillon <boris.brezillon@...labora.com>
> > ---
> > Changes in v3:
> >   - add memory layout to code comment (Boris)
> > Changes in v2:
> >   - updated commit message
> > ---
> >  drivers/staging/media/hantro/hantro_v4l2.c | 20 ++++++++++++++++++--
> >  1 file changed, 18 insertions(+), 2 deletions(-)
> > 
> 
> Thanks for the patch!
> 
> What platform did you test it on and how? Was it tested with IOMMU enabled?

Hello Tomasz,

Please note that this series has been picked-up and is merged
in v5.5-rc1.

IIRC, we tested these patches on RK3399 and RK3288 (that means
with an IOMMU). I've just ran some more extensive tests on RK3288,
on media/master; and I plan to test some more on RK3399 later this week.

Do you have any specific concern in mind?

Thanks,
Ezequiel