linux-kernel - Re: [PATCH v3 07/15] media: sun6i-csi: Add support for MIPI CSI-2 bridge input

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Message-ID: <20201214113424.cx7ox6i5bm7lszhb@gilmour>
Date:   Mon, 14 Dec 2020 12:34:24 +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,
        linux-doc@...r.kernel.org, devel@...verdev.osuosl.org,
        linux-sunxi@...glegroups.com, Yong Deng <yong.deng@...ewell.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh+dt@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        Jonathan Corbet <corbet@....net>,
        Kishon Vijay Abraham I <kishon@...com>,
        Vinod Koul <vkoul@...nel.org>,
        Helen Koike <helen.koike@...labora.com>,
        Dafna Hirschfeld <dafna.hirschfeld@...labora.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Hans Verkuil <hans.verkuil@...co.com>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        kevin.lhopital@...mail.com
Subject: Re: [PATCH v3 07/15] media: sun6i-csi: Add support for MIPI CSI-2
 bridge input

On Fri, Dec 11, 2020 at 04:57:00PM +0100, Paul Kocialkowski wrote:
> The A31 CSI controller supports a MIPI CSI-2 bridge input, which has
> its own dedicated port in the fwnode graph.
> 
> Support for this input is added with this change:
> - two pads are defined for the media entity instead of one
>   and only one needs to be connected at a time;
> - the pads currently match the fwnode graph representation;
> - links are created between our pads and the subdevs for each
>   interface and are no longer immutable so that userspace can select
>   which interface to use in case both are bound to a subdev;
> - fwnode endpoints are parsed and stored for each interface;
> - the active subdev (and fwnode endpoint) is retrieved when validating
>   the media link at stream on time and cleared at stream off;
> - an error is raised if both links are active at the same time;
> - the MIPI interface bit is set if the MIPI CSI-2 bridge endpoint is
>   active.
> 
> In the future, the media entity representation might evolve to:
> - distinguish the internal parallel bridge and data formatter;
> - represent each of the 4 internal channels that can exist between
>   the parallel bridge (for BT656 time-multiplex) and MIPI CSI-2
>   (internal channels can be mapped to virtual channels);
> - connect the controller's output to the ISP instead of its
>   DMA engine.
> 
> Finally note that the MIPI CSI-2 bridges should not be linked in
> the fwnode graph unless they have a sensor subdev attached.
> 
> Signed-off-by: Paul Kocialkowski <paul.kocialkowski@...tlin.com>
> ---
>  .../platform/sunxi/sun6i-csi/sun6i_csi.c      | 123 ++++++++++++++----
>  .../platform/sunxi/sun6i-csi/sun6i_csi.h      |   3 -
>  .../platform/sunxi/sun6i-csi/sun6i_video.c    |  53 ++++----
>  .../platform/sunxi/sun6i-csi/sun6i_video.h    |   7 +-
>  4 files changed, 135 insertions(+), 51 deletions(-)
> 
> diff --git a/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c b/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c
> index f1150de94e98..481181038e1e 100644
> --- a/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c
> +++ b/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c
> @@ -52,15 +52,16 @@ bool sun6i_csi_is_format_supported(struct sun6i_csi *csi,
>  				   u32 pixformat, u32 mbus_code)
>  {
>  	struct sun6i_csi_dev *sdev = sun6i_csi_to_dev(csi);
> +	struct v4l2_fwnode_endpoint *endpoint = sdev->csi.video.source_endpoint;
>  
>  	/*
>  	 * Some video receivers have the ability to be compatible with
>  	 * 8bit and 16bit bus width.
>  	 * Identify the media bus format from device tree.
>  	 */
> -	if ((sdev->csi.v4l2_ep.bus_type == V4L2_MBUS_PARALLEL
> -	     || sdev->csi.v4l2_ep.bus_type == V4L2_MBUS_BT656)
> -	     && sdev->csi.v4l2_ep.bus.parallel.bus_width == 16) {
> +	if ((endpoint->bus_type == V4L2_MBUS_PARALLEL
> +	     || endpoint->bus_type == V4L2_MBUS_BT656)
> +	     && endpoint->bus.parallel.bus_width == 16) {

The operators should be at the end of the previous line, not at the beginning

Maxime

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