drm/panel: panel-simple: make panel_dpi_probe return a panel_desc

If the panel-simple driver is probed from a panel-dpi compatible, the
driver will use an empty panel_desc structure as a descriminant. It
will then allocate and fill another panel_desc as part of its probe.

However, that allocation needs to happen after the panel_simple
structure has been allocated, since panel_dpi_probe(), the function
doing the panel_desc allocation and initialization, takes a panel_simple
pointer as an argument.

This pointer is used to fill the panel_simple->desc pointer that is
still initialized with the empty panel_desc when panel_dpi_probe() is
called.

Since commit de04bb0089a9 ("drm/panel/panel-simple: Use the new
allocation in place of devm_kzalloc()"), we will need the panel
connector type found in panel_desc to allocate panel_simple. This
creates a circular dependency where we need panel_desc to create
panel_simple, and need panel_simple to create panel_desc.

Let's break that dependency by making panel_dpi_probe simply return the
panel_desc it initialized and move the panel_simple->desc assignment to
the caller.

This will not fix the breaking commit entirely, but will move us towards
the right direction.

Fixes: de04bb0089a9 ("drm/panel/panel-simple: Use the new allocation in place of devm_kzalloc()")
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Tested-by: Francesco Dolcini <francesco.dolcini@toradex.com> # Toradex Colibri iMX6
Link: https://lore.kernel.org/r/20250626-drm-panel-simple-fixes-v2-2-5afcaa608bdc@kernel.org
Signed-off-by: Maxime Ripard <mripard@kernel.org>

diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c
index 0a3b26bb4d731c54614e24e38018c308acd5367a..89188e683822f9202ec580c9a294e42083b9704a 100644 (file)
--- a/drivers/gpu/drm/panel/panel-simple.c
+++ b/drivers/gpu/drm/panel/panel-simple.c
@@ -432,8 +432,7 @@ static const struct drm_panel_funcs panel_simple_funcs = {
 
 static struct panel_desc panel_dpi;
 
-static int panel_dpi_probe(struct device *dev,
-                          struct panel_simple *panel)
+static struct panel_desc *panel_dpi_probe(struct device *dev)
 {
        struct display_timing *timing;
        const struct device_node *np;
@@ -445,17 +444,17 @@ static int panel_dpi_probe(struct device *dev,
        np = dev->of_node;
        desc = devm_kzalloc(dev, sizeof(*desc), GFP_KERNEL);
        if (!desc)
-               return -ENOMEM;
+               return ERR_PTR(-ENOMEM);
 
        timing = devm_kzalloc(dev, sizeof(*timing), GFP_KERNEL);
        if (!timing)
-               return -ENOMEM;
+               return ERR_PTR(-ENOMEM);
 
        ret = of_get_display_timing(np, "panel-timing", timing);
        if (ret < 0) {
                dev_err(dev, "%pOF: no panel-timing node found for \"panel-dpi\" binding\n",
                        np);
-               return ret;
+               return ERR_PTR(ret);
        }
 
        desc->timings = timing;
@@ -473,9 +472,7 @@ static int panel_dpi_probe(struct device *dev,
        /* We do not know the connector for the DT node, so guess it */
        desc->connector_type = DRM_MODE_CONNECTOR_DPI;
 
-       panel->desc = desc;
-
-       return 0;
+       return desc;
 }
 
 #define PANEL_SIMPLE_BOUNDS_CHECK(to_check, bounds, field) \
@@ -613,10 +610,13 @@ static int panel_simple_probe(struct device *dev, const struct panel_desc *desc)
 
        if (desc == &panel_dpi) {
                /* Handle the generic panel-dpi binding */
-               err = panel_dpi_probe(dev, panel);
-               if (err)
+               desc = panel_dpi_probe(dev);
+               if (IS_ERR(desc)) {
+                       err = PTR_ERR(desc);
                        goto free_ddc;
-               desc = panel->desc;
+               }
+
+               panel->desc = desc;
        } else {
                if (!of_get_display_timing(dev->of_node, "panel-timing", &dt))
                        panel_simple_parse_panel_timing_node(dev, panel, &dt);