linux-kernel - Re: [PATCH 12/14] media: sunxi: Add support for the A83T MIPI CSI-2 controller

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Message-ID: <20201026170041.qsjzxlurufuuhcsq@gilmour.lan>
Date:   Mon, 26 Oct 2020 18:00:41 +0100
From:   Maxime Ripard <maxime@...no.tech>
To:     Paul Kocialkowski <paul.kocialkowski@...tlin.com>
Cc:     linux-media@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        devel@...verdev.osuosl.org, linux-sunxi@...glegroups.com,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh+dt@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
        Yong Deng <yong.deng@...ewell.com>,
        Kishon Vijay Abraham I <kishon@...com>,
        Vinod Koul <vkoul@...nel.org>,
        Helen Koike <helen.koike@...labora.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Hans Verkuil <hans.verkuil@...co.com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Hans Verkuil <hverkuil@...all.nl>, kevin.lhopital@...mail.com
Subject: Re: [PATCH 12/14] media: sunxi: Add support for the A83T MIPI CSI-2
 controller

On Fri, Oct 23, 2020 at 07:45:44PM +0200, Paul Kocialkowski wrote:
> The A83T supports MIPI CSI-2 with a composite controller, covering both the
> protocol logic and the D-PHY implementation. This controller seems to be found
> on the A83T only and probably was abandonned since.
> 
> This implementation splits the protocol and D-PHY registers and uses the PHY
> framework internally. The D-PHY is not registered as a standalone PHY driver
> since it cannot be used with any other controller.
> 
> There are a few notable points about the controller:
> - The initialisation sequence involes writing specific magic init values that
>   do not seem to make any particular sense given the concerned register fields.
> - Interrupts appear to be hitting regardless of the interrupt mask registers,
>   which can cause a serious flood when transmission errors occur.

Ah, so it's a separate driver too.

> This work is based on the first version of the driver submitted by
> Kévin L'hôpital, which was adapted to mainline from the Allwinner BSP.
> This version integrates MIPI CSI-2 support as a standalone V4L2 subdev
> instead of merging it in the sun6i-csi driver.
> 
> It was tested on a Banana Pi M3 board with an OV8865 sensor in a 4-lane
> configuration.

Co-developped-by and SoB from Kevin?

Looking at the driver, the same comments from the v3s apply there

Maxime

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