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

[Paul Kocialkowski <paul.kocialkowski@bootlin.com>]

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Hi Jernej,

On Thu 28 Apr 22, 10:09, Jernej Škrabec wrote:
> Dne četrtek, 28. april 2022 ob 09:55:56 CEST je Paul Kocialkowski napisal(a):
> > Hi Jernej,
> > 
> > Thanks a lot for all your reviews!
> > 
> > On Wed 27 Apr 22, 22:07, Jernej Škrabec wrote:
> > > 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@bootlin.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?
> > 
> > That is defined through Kconfig's auto-generated header, from the associated
> > option for the ISP driver. It is defined in the ISP support series so this
> > will effectively always be false for now.
> 
> Well, then, that driver should be merged before this patch. While I understand 
> that it's likely that ISP driver with such name will eventually materialize in 
> kernel, I don't want to rely on things that are not set in stone, e.g. already 
> merged.

Okay that would make sense, the patches adding ISP support in sun6i-csi could
be moved to the series adding support for the ISP.

Cheers,

Paul

> Best regards,
> Jernej
> 
> > 
> > > 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 {
> 
> 
> 
> 

-- 
Paul Kocialkowski, Bootlin
Embedded Linux and kernel engineering
https://bootlin.com

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