Hi Maxime,
On Fri 18 Mar 22, 17:18, Maxime Ripard wrote:
> On Fri, Mar 18, 2022 at 05:02:49PM +0100, Paul Kocialkowski wrote:
> > While bridge/panel detection was initially relying on the usual
> > port/ports-based of graph detection, it was recently changed to
> > perform the lookup on any child node that is not port/ports
> > instead when such a node is available, with no fallback on the
> > usual way.
> >
> > This results in breaking detection when a child node is present
> > but does not contain any panel or bridge node, even when the
> > usual port/ports-based of graph is there.
> >
> > In order to support both situations properly, this commit reworks
> > the logic to try both options and not just one of the two: it will
> > only return -EPROBE_DEFER when both have failed.
> >
> > Signed-off-by: Paul Kocialkowski <paul.kocialkowski@xxxxxxxxxxx>
> > Fixes: 80253168dbfd ("drm: of: Lookup if child node has panel or bridge")
> > ---
> >
> > Changes since v1:
> > - Renamed remote to node;
> > - Renamed helper to find_panel_or_bridge;
> > - Cleared bridge pointer early;
> > - Returned early to make the code more concise;
> >
> > ---
> > drivers/gpu/drm/drm_of.c | 98 ++++++++++++++++++++--------------------
> > 1 file changed, 49 insertions(+), 49 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/drm_of.c b/drivers/gpu/drm/drm_of.c
> > index 9d90cd75c457..63137c833b7a 100644
> > --- a/drivers/gpu/drm/drm_of.c
> > +++ b/drivers/gpu/drm/drm_of.c
> > @@ -219,6 +219,28 @@ int drm_of_encoder_active_endpoint(struct device_node *node,
> > }
> > EXPORT_SYMBOL_GPL(drm_of_encoder_active_endpoint);
> >
> > +static int find_panel_or_bridge(struct device_node *node,
> > + struct drm_panel **panel,
> > + struct drm_bridge **bridge)
> > +{
> > + if (panel) {
> > + *panel = of_drm_find_panel(node);
> > + if (!IS_ERR(*panel))
> > + return 0;
> > + else
> > + *panel = NULL;
>
> You don't need the else branch here, we already cleared panel in
> drm_of_find_panel_or_bridge
I think we do, because of_drm_find_panel doesn't return NULL when an error
happens but PTR_ERR(), so we need to clear it to keep up with previous
expectations.
> Looks good otherwise, thanks!
Great, thanks for the review!
Paul
--
Paul Kocialkowski, Bootlin
Embedded Linux and kernel engineering
https://bootlin.com
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