linux-kernel - Re: [PATCHv2] omap3isp: add support for CSI1 bus

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Date:   Sat, 4 Mar 2017 00:17:48 +0200
From:   Sakari Ailus <sakari.ailus@....fi>
To:     Pavel Machek <pavel@....cz>
Cc:     Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        mchehab@...nel.org, kernel list <linux-kernel@...r.kernel.org>,
        ivo.g.dimitrov.75@...il.com, sre@...nel.org, pali.rohar@...il.com,
        linux-media@...r.kernel.org
Subject: Re: [PATCHv2] omap3isp: add support for CSI1 bus

Hi Pavel,

On Thu, Mar 02, 2017 at 01:38:48PM +0100, Pavel Machek wrote:
> Hi!
> 
> > > Ok, how about this one?
> > > omap3isp: add rest of CSI1 support
> > >     
> > > CSI1 needs one more bit to be set up. Do just that.
> > >     
> > > It is not as straightforward as I'd like, see the comments in the code
> > > for explanation.
> ...
> > > +	if (isp->phy_type == ISP_PHY_TYPE_3430) {
> > > +		struct media_pad *pad;
> > > +		struct v4l2_subdev *sensor;
> > > +		const struct isp_ccp2_cfg *buscfg;
> > > +
> > > +		pad = media_entity_remote_pad(&ccp2->pads[CCP2_PAD_SINK]);
> > > +		sensor = media_entity_to_v4l2_subdev(pad->entity);
> > > +		/* Struct isp_bus_cfg has union inside */
> > > +		buscfg = &((struct isp_bus_cfg *)sensor->host_priv)->bus.ccp2;
> > > +
> > > +		csiphy_routing_cfg_3430(&isp->isp_csiphy2,
> > > +					ISP_INTERFACE_CCP2B_PHY1,
> > > +					enable, !!buscfg->phy_layer,
> > > +					buscfg->strobe_clk_pol);
> > 
> > You should do this through omap3isp_csiphy_acquire(), and not call
> > csiphy_routing_cfg_3430() directly from here.
> 
> Well, unfortunately omap3isp_csiphy_acquire() does have csi2
> assumptions hard-coded :-(.
> 
> This will probably fail.
> 
> 	        rval = omap3isp_csi2_reset(phy->csi2);
> 	        if (rval < 0)
> 		                goto done;

Yes. It needs to be fixed. :-)

> 				
> And this will oops:
> 
> static int omap3isp_csiphy_config(struct isp_csiphy *phy)
> {
> 	struct isp_csi2_device *csi2 = phy->csi2;
>         struct isp_pipeline *pipe = to_isp_pipeline(&csi2->subdev.entity);
>  	struct isp_bus_cfg *buscfg = pipe->external->host_priv;

There seems to be some more work left, yes. :-I

> 
> > > @@ -1137,10 +1159,19 @@ int omap3isp_ccp2_init(struct isp_device *isp)
> > >  	if (isp->revision == ISP_REVISION_2_0) {
> > >  		ccp2->vdds_csib = devm_regulator_get(isp->dev, "vdds_csib");
> > >  		if (IS_ERR(ccp2->vdds_csib)) {
> > > +			if (PTR_ERR(ccp2->vdds_csib) == -EPROBE_DEFER)
> > > +				return -EPROBE_DEFER;
> > 
> > This should go to a separate patch.
> 
> Ok, easy enough.
> 
> > >  			dev_dbg(isp->dev,
> > >  				"Could not get regulator vdds_csib\n");
> > >  			ccp2->vdds_csib = NULL;
> > >  		}
> > > +		/*
> > > +		 * If we set up ccp2->phy here,
> > > +		 * omap3isp_csiphy_acquire() will go ahead and assume
> > > +		 * csi2, dereferencing some null pointers.
> > > +		 *
> > > +		 * ccp2->phy = &isp->isp_csiphy2;
> > 
> > That needs to be fixed separately.
> 
> See analysis above. Yes, it would be nice to fix it. Can you provide
> some hints how to do that? Maybe even patch to test? :-).

If I only will have the time. Let's see if I can find some time this
week-end.

-- 
Kind regards,

Sakari Ailus
e-mail: sakari.ailus@....fi	XMPP: sailus@...iisi.org.uk