linux-kernel - Re: [PATCH v2 1/3] media: V3s: Add support for Allwinner CSI.

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Date:   Wed, 22 Nov 2017 10:45:26 +0100
From:   Maxime Ripard <maxime.ripard@...e-electrons.com>
To:     Yong <yong.deng@...ewell.com>
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Chen-Yu Tsai <wens@...e.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "David S. Miller" <davem@...emloft.net>,
        Hans Verkuil <hverkuil@...all.nl>,
        Arnd Bergmann <arnd@...db.de>,
        Hugues Fruchet <hugues.fruchet@...com>,
        Yannick Fertre <yannick.fertre@...com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Benoit Parrot <bparrot@...com>,
        Benjamin Gaignard <benjamin.gaignard@...aro.org>,
        Jean-Christophe Trotin <jean-christophe.trotin@...com>,
        Ramesh Shanmugasundaram <ramesh.shanmugasundaram@...renesas.com>,
        Minghsiu Tsai <minghsiu.tsai@...iatek.com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Robert Jarzmik <robert.jarzmik@...e.fr>,
        linux-media@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-sunxi@...glegroups.com
Subject: Re: [PATCH v2 1/3] media: V3s: Add support for Allwinner CSI.

Hi,

On Wed, Nov 22, 2017 at 09:33:06AM +0800, Yong wrote:
> > On Thu, Jul 27, 2017 at 01:01:35PM +0800, Yong Deng wrote:
> > > Allwinner V3s SoC have two CSI module. CSI0 is used for MIPI interface
> > > and CSI1 is used for parallel interface. This is not documented in
> > > datasheet but by testing and guess.
> > > 
> > > This patch implement a v4l2 framework driver for it.
> > > 
> > > Currently, the driver only support the parallel interface. MIPI-CSI2,
> > > ISP's support are not included in this patch.
> > > 
> > > Signed-off-by: Yong Deng <yong.deng@...ewell.com>
> > 
> > Thanks again for this driver.
> > 
> > It seems like at least this iteration is behaving in a weird way with
> > DMA transfers for at least YU12 and NV12 (and I would assume YV12).
> > 
> > Starting a transfer of multiple frames in either of these formats,
> > using either ffmpeg (ffmpeg -f v4l2 -video_size 640x480 -framerate 30
> > -i /dev/video0 output.mkv) or yavta (yavta -c80 -p -F --skip 0 -f NV12
> > -s 640x480 $(media-c tl -e 'sun6i-csi')) will end up in a panic.
> > 
> > The panic seems to be generated with random data going into parts of
> > the kernel memory, the pattern being in my case something like
> > 0x8287868a which is very odd (always around 0x88)
> > 
> > It turns out that when you cover the sensor, the values change to
> > around 0x28, so it really seems like it's pixels that have been copied
> > there.
> > 
> > I've looked quickly at the DMA setup, and it seems reasonable to
> > me. Do you have the same issue on your side? Have you been able to
> > test those formats using your hardware?
> 
> I had tested the following formats with BT1120 input:
> V4L2_PIX_FMT_NV12		-> NV12
> V4L2_PIX_FMT_NV21		-> NV21
> V4L2_PIX_FMT_NV16		-> NV16
> V4L2_PIX_FMT_NV61		-> NV61
> V4L2_PIX_FMT_YUV420		-> YU12
> V4L2_PIX_FMT_YVU420		-> YV12
> V4L2_PIX_FMT_YUV422P		-> 422P
> And they all work fine.

Ok, that's good to know.

> > Given that they all are planar formats and YUYV and the likes work
> > just fine, maybe we can leave them aside for now?
> 
> V4L2_PIX_FMT_YUV422P and V4L2_PIX_FMT_YUYV is OK, and V4L2_PIX_FMT_NV12
> is bad? It's really weird.
> 
> What's your input bus code format, type and width?

The sensor is an ov5640, so the MBUS code for the bus is
MEDIA_BUS_FMT_YUYV8_2X8.

Thanks!
Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

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