From: Jagan Teki <jagan@xxxxxxxxxx>
commit <3d7039e1e649> ("drm: bridge: mcde_dsi: Switch to devm_drm_of_get_bridge")
switched to devm_drm_of_get_bridge for looking up if child node has panel
or bridge.
However commit <b089c0a9b14c> ("Revert "drm: of: Lookup if child node
has panel or bridge") has reverted panel or bridge child node lookup
from devm_drm_of_get_bridge as it breaks the non-trivial cases the
first child node might not be a panel or bridge.
So, revert this commit to switch the previous behavior of looking up
child panel or bridge.
Signed-off-by: Jagan Teki <jagan@xxxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/mcde/mcde_dsi.c | 44 ++++++++++++++++++++++++++++-----
1 file changed, 38 insertions(+), 6 deletions(-)
diff --git a/drivers/gpu/drm/mcde/mcde_dsi.c b/drivers/gpu/drm/mcde/mcde_dsi.c
index 083a4728654d..5651734ce977 100644
--- a/drivers/gpu/drm/mcde/mcde_dsi.c
+++ b/drivers/gpu/drm/mcde/mcde_dsi.c
@@ -19,6 +19,7 @@
#include <drm/drm_mipi_dsi.h>
#include <drm/drm_modeset_helper_vtables.h>
#include <drm/drm_of.h>
+#include <drm/drm_panel.h>
#include <drm/drm_print.h>
#include <drm/drm_probe_helper.h>
@@ -38,6 +39,7 @@ struct mcde_dsi {
struct device *dev;
struct mcde *mcde;
struct drm_bridge bridge;
+ struct drm_panel *panel;
struct drm_bridge *bridge_out;
struct mipi_dsi_host dsi_host;
struct mipi_dsi_device *mdsi;
@@ -1071,7 +1073,9 @@ static int mcde_dsi_bind(struct device *dev, struct device *master,
struct drm_device *drm = data;
struct mcde *mcde = to_mcde(drm);
struct mcde_dsi *d = dev_get_drvdata(dev);
- struct drm_bridge *bridge;
+ struct device_node *child;
+ struct drm_panel *panel = NULL;
+ struct drm_bridge *bridge = NULL;
if (!of_get_available_child_count(dev->of_node)) {
dev_info(dev, "unused DSI interface\n");
@@ -1096,10 +1100,37 @@ static int mcde_dsi_bind(struct device *dev, struct device *master,
return PTR_ERR(d->lp_clk);
}
- bridge = devm_drm_of_get_bridge(dev, dev->of_node, 0, 0);
- if (IS_ERR(bridge)) {
- dev_err(dev, "error to get bridge\n");
- return PTR_ERR(bridge);
+ /* Look for a panel as a child to this node */
+ for_each_available_child_of_node(dev->of_node, child) {
+ panel = of_drm_find_panel(child);
+ if (IS_ERR(panel)) {
+ dev_err(dev, "failed to find panel try bridge (%ld)\n",
+ PTR_ERR(panel));
+ panel = NULL;
+
+ bridge = of_drm_find_bridge(child);
+ if (!bridge) {
+ dev_err(dev, "failed to find bridge\n");
+ return -EINVAL;
+ }
+ }
+ }
+ if (panel) {
+ bridge = drm_panel_bridge_add_typed(panel,
+ DRM_MODE_CONNECTOR_DSI);
+ if (IS_ERR(bridge)) {
+ dev_err(dev, "error adding panel bridge\n");
+ return PTR_ERR(bridge);
+ }
+ dev_info(dev, "connected to panel\n");
+ d->panel = panel;
+ } else if (bridge) {
+ /* TODO: AV8100 HDMI encoder goes here for example */
+ dev_info(dev, "connected to non-panel bridge (unsupported)\n");
+ return -ENODEV;
+ } else {
+ dev_err(dev, "no panel or bridge\n");
+ return -ENODEV;
}
d->bridge_out = bridge;
@@ -1122,7 +1153,8 @@ static void mcde_dsi_unbind(struct device *dev, struct device *master,
{
struct mcde_dsi *d = dev_get_drvdata(dev);
- drm_bridge_remove(d->bridge_out);
+ if (d->panel)
+ drm_panel_bridge_remove(d->bridge_out);
regmap_update_bits(d->prcmu, PRCM_DSI_SW_RESET,
PRCM_DSI_SW_RESET_DSI0_SW_RESETN, 0);
}
--
2.25.1
