Messages in this thread Patch in this message | | | Date | Fri, 13 Dec 2019 23:21:35 +0200 | From | Laurent Pinchart <> | Subject | Re: [PATCH v4 2/7] drm: rcar-du: lvds: Improve identification of panels |
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Hi Fabrizio,
Thank you for the patch.
On Fri, Dec 06, 2019 at 04:32:49PM +0000, Fabrizio Castro wrote: > Dual-LVDS panels are mistakenly identified as bridges, this > commit replaces the current logic with a call to > drm_of_find_panel_or_bridge to sort that out. > > Signed-off-by: Fabrizio Castro <fabrizio.castro@bp.renesas.com> > > --- > v3->v4: > * New patch extracted from patch: > "drm: rcar-du: lvds: Add dual-LVDS panels support" > --- > drivers/gpu/drm/rcar-du/rcar_lvds.c | 45 +++++++++---------------------------- > 1 file changed, 10 insertions(+), 35 deletions(-) > > diff --git a/drivers/gpu/drm/rcar-du/rcar_lvds.c b/drivers/gpu/drm/rcar-du/rcar_lvds.c > index 8c6c172..3cb0a83 100644 > --- a/drivers/gpu/drm/rcar-du/rcar_lvds.c > +++ b/drivers/gpu/drm/rcar-du/rcar_lvds.c > @@ -21,6 +21,7 @@ > #include <drm/drm_atomic.h> > #include <drm/drm_atomic_helper.h> > #include <drm/drm_bridge.h> > +#include <drm/drm_of.h> > #include <drm/drm_panel.h> > #include <drm/drm_probe_helper.h> > > @@ -705,10 +706,7 @@ static int rcar_lvds_parse_dt_companion(struct rcar_lvds *lvds) > static int rcar_lvds_parse_dt(struct rcar_lvds *lvds) > { > struct device_node *local_output = NULL; > - struct device_node *remote_input = NULL; > struct device_node *remote = NULL; > - struct device_node *node; > - bool is_bridge = false; > int ret = 0; > > local_output = of_graph_get_endpoint_by_regs(lvds->dev->of_node, 1, 0); > @@ -736,45 +734,22 @@ static int rcar_lvds_parse_dt(struct rcar_lvds *lvds) > goto done; > }
I think you can remove the calls above this too. drm_of_find_panel_or_bridge() calls of_graph_get_remote_node(), which in turn calls of_graph_get_endpoint_by_regs(), of_graph_get_remote_port_parent() and checks the status of the remote with of_device_is_available().
> > - remote_input = of_graph_get_remote_endpoint(local_output); > - > - for_each_endpoint_of_node(remote, node) { > - if (node != remote_input) { > - /* > - * We've found one endpoint other than the input, this > - * must be a bridge. > - */ > - is_bridge = true; > - of_node_put(node); > - break; > - } > - } > - > - if (is_bridge) { > - lvds->next_bridge = of_drm_find_bridge(remote); > - if (!lvds->next_bridge) { > - ret = -EPROBE_DEFER; > - goto done; > - } > + ret = drm_of_find_panel_or_bridge(lvds->dev->of_node, 1, 0, > + &lvds->panel, &lvds->next_bridge); > + if (ret) > + goto done; > > - if (lvds->info->quirks & RCAR_LVDS_QUIRK_DUAL_LINK) > - lvds->dual_link = lvds->next_bridge->timings > - ? lvds->next_bridge->timings->dual_link > - : false; > - } else { > - lvds->panel = of_drm_find_panel(remote); > - if (IS_ERR(lvds->panel)) { > - ret = PTR_ERR(lvds->panel); > - goto done; > - } > - } > + if ((lvds->info->quirks & RCAR_LVDS_QUIRK_DUAL_LINK) && > + lvds->next_bridge) > + lvds->dual_link = lvds->next_bridge->timings > + ? lvds->next_bridge->timings->dual_link > + : false; > > if (lvds->dual_link) > ret = rcar_lvds_parse_dt_companion(lvds); > > done: > of_node_put(local_output); > - of_node_put(remote_input); > of_node_put(remote); > > /*
-- Regards,
Laurent Pinchart
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