linux-kernel - Re: [PATCH v4 43/45] media: sun6i-csi: Detect the availability of the ISP

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Date:   Wed, 27 Apr 2022 22:07:49 +0200
From:   Jernej Škrabec <jernej.skrabec@...il.com>
To:     linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-sunxi@...ts.linux.dev,
        Paul Kocialkowski <paul.kocialkowski@...tlin.com>
Cc:     Yong Deng <yong.deng@...ewell.com>,
        Paul Kocialkowski <paul.kocialkowski@...tlin.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Chen-Yu Tsai <wens@...e.org>,
        Samuel Holland <samuel@...lland.org>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Subject: Re: [PATCH v4 43/45] media: sun6i-csi: Detect the availability of the ISP

Dne petek, 15. april 2022 ob 17:28:09 CEST je Paul Kocialkowski napisal(a):
> Add a helper to detect whether the ISP is available and connected
> and store the indication in a driver-wide variable.
> 
> Signed-off-by: Paul Kocialkowski <paul.kocialkowski@...tlin.com>
> ---
>  .../platform/sunxi/sun6i-csi/sun6i_csi.c      | 33 +++++++++++++++++++
>  .../platform/sunxi/sun6i-csi/sun6i_csi.h      |  3 ++
>  2 files changed, 36 insertions(+)
> 
> diff --git a/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c
> b/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c index
> a88deb8ba1e7..f185cbd113c7 100644
> --- a/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c
> +++ b/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c
> @@ -25,6 +25,35 @@
>  #include "sun6i_csi_capture.h"
>  #include "sun6i_csi_reg.h"
> 
> +/* ISP */
> +
> +static bool sun6i_csi_isp_detect(struct sun6i_csi_device *csi_dev)
> +{
> +	struct device *dev = csi_dev->dev;
> +	struct fwnode_handle *handle = NULL;
> +
> +	/* ISP is not available if disabled in kernel config. */
> +	if (!IS_ENABLED(CONFIG_VIDEO_SUN6I_ISP))

Where is this symbol defined?

Best regards,
Jernej

> +		return 0;
> +
> +	/*
> +	 * ISP is not available if not connected via fwnode graph.
> +	 * This weill also check that the remote parent node is available.
> +	 */
> +	handle = fwnode_graph_get_endpoint_by_id(dev_fwnode(dev),
> +						 
SUN6I_CSI_PORT_ISP, 0,
> +						 
FWNODE_GRAPH_ENDPOINT_NEXT);
> +	if (!handle)
> +		return 0;
> +
> +	fwnode_handle_put(handle);
> +
> +	dev_info(dev, "ISP link is available\n");
> +	csi_dev->isp_available = true;
> +
> +	return 0;
> +}
> +
>  /* Media */
> 
>  static const struct media_device_ops sun6i_csi_media_ops = {
> @@ -306,6 +335,10 @@ static int sun6i_csi_probe(struct platform_device
> *platform_dev) if (ret)
>  		return ret;
> 
> +	ret = sun6i_csi_isp_detect(csi_dev);
> +	if (ret)
> +		goto error_resources;
> +
>  	ret = sun6i_csi_v4l2_setup(csi_dev);
>  	if (ret)
>  		goto error_resources;
> diff --git a/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.h
> b/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.h index
> 6aa83dd11684..9b105c341047 100644
> --- a/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.h
> +++ b/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.h
> @@ -22,6 +22,7 @@
>  enum sun6i_csi_port {
>  	SUN6I_CSI_PORT_PARALLEL		= 0,
>  	SUN6I_CSI_PORT_MIPI_CSI2	= 1,
> +	SUN6I_CSI_PORT_ISP		= 2,
>  };
> 
>  struct sun6i_csi_buffer {
> @@ -46,6 +47,8 @@ struct sun6i_csi_device {
>  	struct clk			*clock_mod;
>  	struct clk			*clock_ram;
>  	struct reset_control		*reset;
> +
> +	bool				isp_available;
>  };
> 
>  struct sun6i_csi_variant {