Re: [PATCH v2 6/7] drm/vc4: dsi: stop using deprecated drmm_of_get_bridge()

[Paul Cercueil <paul.cercueil@bootlin.com>]

Le jeudi 01 octobre 2026 à 10:56 +0200, Paul Cercueil a écrit :
> Hi Luca,
> 
> Le mardi 29 septembre 2026 à 15:39 +0200, Luca Ceresoli a écrit :
> > drmm_of_get_bridge() is deprecated, switch to
> > of_drm_get_bridge_by_endpoint(). As of_drm_get_bridge_by_endpoint() returns
> > a refcounted bridge, ensure it is put by using bridge.next_bridge.
> > 
> > drm_panel.h becomes unused, drop the include.
> > 
> > Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
> > ---
> >  drivers/gpu/drm/vc4/vc4_dsi.c | 10 ++++------
> >  1 file changed, 4 insertions(+), 6 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/vc4/vc4_dsi.c b/drivers/gpu/drm/vc4/vc4_dsi.c
> > index 0148f2befed1..30598738cfcf 100644
> > --- a/drivers/gpu/drm/vc4/vc4_dsi.c
> > +++ b/drivers/gpu/drm/vc4/vc4_dsi.c
> > @@ -35,7 +35,6 @@
> >  #include <drm/drm_edid.h>
> >  #include <drm/drm_mipi_dsi.h>
> >  #include <drm/drm_of.h>
> > -#include <drm/drm_panel.h>
> >  #include <drm/drm_print.h>
> >  #include <drm/drm_probe_helper.h>
> >  #include <drm/drm_simple_kms_helper.h>
> > @@ -555,7 +554,6 @@ struct vc4_dsi {
> >  
> >  	struct platform_device *pdev;
> >  
> > -	struct drm_bridge *out_bridge;
> >  	struct drm_bridge bridge;
> >  
> >  	void __iomem *regs;
> > @@ -1165,7 +1163,7 @@ static int vc4_dsi_bridge_attach(struct drm_bridge
> > *bridge,
> >  	struct vc4_dsi *dsi = bridge_to_vc4_dsi(bridge);
> >  
> >  	/* Attach the panel or bridge to the dsi bridge */
> > -	return drm_bridge_attach(encoder, dsi->out_bridge,
> > +	return drm_bridge_attach(encoder, dsi->bridge.next_bridge,
> >  				 &dsi->bridge, flags);
> >  }
> >  
> > @@ -1749,9 +1747,9 @@ static int vc4_dsi_bind(struct device *dev, struct
> > device *master, void *data)
> >  		return ret;
> >  	}
> >  
> > -	dsi->out_bridge = drmm_of_get_bridge(drm, dev->of_node, 0, 0);
> > -	if (IS_ERR(dsi->out_bridge))
> > -		return PTR_ERR(dsi->out_bridge);
> > +	dsi->bridge.next_bridge = of_drm_get_bridge_by_endpoint(dev-
> > >of_node,
> > 0, 0);
> > +	if (IS_ERR(dsi->bridge.next_bridge))
> > +		return PTR_ERR(dsi->bridge.next_bridge);
> 
> I had to double-check that it is fine to leave the .next_bridge field as a
> pointer-encoded error. It works because drm_bridge_put() handles this case.
> 
> Reviewed-by: Paul Cercueil <paul.cercueil@bootlin.com>

Actually scrap that - I missed Sashiko's review which found an issue I had
totally missed.

-Paul