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SubjectRE: [PATCH v4 2/7] drm: rcar-du: lvds: Improve identification of panels
Date
Hi Laurent,

Thank you for your feedback!

> From: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> Sent: 13 December 2019 21:22
> Subject: Re: [PATCH v4 2/7] drm: rcar-du: lvds: Improve identification of panels
>
> 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().

Will take those out in v5

Thanks,
Fab

>
> >
> > - 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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