lkml.org 
[lkml]   [2019]   [Dec]   [17]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v6 2/6] drm: rcar-du: lvds: Improve identification of panels
Date
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>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

---
v5->v6:
* No change

v4->v5:
* Addressed comments from Laurent's review

v3->v4:
* New patch extracted from patch:
"drm: rcar-du: lvds: Add dual-LVDS panels support"
---
drivers/gpu/drm/rcar-du/rcar_lvds.c | 75 +++++--------------------------------
1 file changed, 10 insertions(+), 65 deletions(-)

diff --git a/drivers/gpu/drm/rcar-du/rcar_lvds.c b/drivers/gpu/drm/rcar-du/rcar_lvds.c
index 87a5e8e..da71107 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>

@@ -712,79 +713,23 @@ 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);
- if (!local_output) {
- dev_dbg(lvds->dev, "unconnected port@1\n");
- ret = -ENODEV;
- goto done;
- }
-
- /*
- * Locate the connected entity and infer its type from the number of
- * endpoints.
- */
- remote = of_graph_get_remote_port_parent(local_output);
- if (!remote) {
- dev_dbg(lvds->dev, "unconnected endpoint %pOF\n", local_output);
- ret = -ENODEV;
- goto done;
- }
+ int ret;

- if (!of_device_is_available(remote)) {
- dev_dbg(lvds->dev, "connected entity %pOF is disabled\n",
- remote);
- ret = -ENODEV;
+ ret = drm_of_find_panel_or_bridge(lvds->dev->of_node, 1, 0,
+ &lvds->panel, &lvds->next_bridge);
+ if (ret)
goto done;
- }

- 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;
- }
-
- 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);
-
/*
* On D3/E3 the LVDS encoder provides a clock to the DU, which can be
* used for the DPAD output even when the LVDS output is not connected.
--
2.7.4
\
 
 \ /
  Last update: 2019-12-17 14:48    [W:0.055 / U:15.984 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site