linux-kernel - Re: [PATCH v5 2/2] media: V3s: Add support for Allwinner CSI.

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Date:   Thu, 11 Jan 2018 14:28:44 +0100
From:   Maxime Ripard <maxime.ripard@...e-electrons.com>
To:     Yong Deng <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>,
        "David S. Miller" <davem@...emloft.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Randy Dunlap <rdunlap@...radead.org>,
        Hans Verkuil <hans.verkuil@...co.com>,
        Stanimir Varbanov <stanimir.varbanov@...aro.org>,
        Hugues Fruchet <hugues.fruchet@...com>,
        Yannick Fertre <yannick.fertre@...com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Arnd Bergmann <arnd@...db.de>,
        Benjamin Gaignard <benjamin.gaignard@...aro.org>,
        Ramesh Shanmugasundaram <ramesh.shanmugasundaram@...renesas.com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Rick Chang <rick.chang@...iatek.com>,
        linux-media@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-sunxi@...glegroups.com, megous@...ous.com
Subject: Re: [PATCH v5 2/2] media: V3s: Add support for Allwinner CSI.

Hi Yong,

On Thu, Jan 11, 2018 at 11:06:06AM +0800, Yong Deng wrote:
> Allwinner V3s SoC features two CSI module. CSI0 is used for MIPI CSI-2
> interface and CSI1 is used for parallel interface. This is not
> documented in datasheet but by test 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>

I've needed this patch in order to fix a NULL pointer dereference:
http://code.bulix.org/oz6gmb-257359?raw

This is needed because while it's ok to have a NULL pointer to
v4l2_subdev_pad_config when you call the subdev set_fmt with
V4L2_SUBDEV_FORMAT_ACTIVE, it's not with V4L2_SUBDEV_FORMAT_TRY, and
sensors will assume taht it's a valid pointer.

Otherwise,
Tested-by: Maxime Ripard <maxime.ripard@...e-electrons.com>

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

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