linux-kernel - [PATCH RFC 3/4] drm/panel: Introduce simulated panel bridge API

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Date: Tue, 16 Jan 2024 14:22:06 -0800
From: Jessica Zhang <quic_jesszhan@...cinc.com>
To: Neil Armstrong <neil.armstrong@...aro.org>,
        Sam Ravnborg
	<sam@...nborg.org>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>
CC: <quic_abhinavk@...cinc.com>, <linux-kernel@...r.kernel.org>,
        <dri-devel@...ts.freedesktop.org>,
        Jessica Zhang <quic_jesszhan@...cinc.com>
Subject: [PATCH RFC 3/4] drm/panel: Introduce simulated panel bridge API

Add separate bridge and drm_panel API for getting the simulated panel.

Signed-off-by: Jessica Zhang <quic_jesszhan@...cinc.com>
---
 drivers/gpu/drm/bridge/panel.c | 24 ++++++++++++++++++++++++
 drivers/gpu/drm/drm_panel.c    | 33 +++++++++++++++++++++++++++++++++
 include/drm/drm_bridge.h       |  1 +
 include/drm/drm_panel.h        |  1 +
 4 files changed, 59 insertions(+)

diff --git a/drivers/gpu/drm/bridge/panel.c b/drivers/gpu/drm/bridge/panel.c
index e48823a4f1ede..87a83f4ce68a1 100644
--- a/drivers/gpu/drm/bridge/panel.c
+++ b/drivers/gpu/drm/bridge/panel.c
@@ -499,6 +499,30 @@ struct drm_connector *drm_panel_bridge_connector(struct drm_bridge *bridge)
 }
 EXPORT_SYMBOL(drm_panel_bridge_connector);
 
+/**
+ * drm_get_sim_panel_bridge - return the simulated panel bridge
+ * @dev: device to tie the bridge lifetime to
+ *
+ * This function will return a bridge for the simulated panel.
+ *
+ * Returns a pointer to the bridge if successful, or an error pointer
+ * otherwise.
+ */
+struct drm_bridge *drm_get_sim_panel_bridge(struct device *dev)
+{
+	struct drm_bridge *bridge;
+	struct drm_panel *panel;
+
+	panel = drm_find_sim_panel();
+	if (IS_ERR(panel))
+		return ERR_PTR(-EPROBE_DEFER);
+
+	bridge = devm_drm_panel_bridge_add(dev, panel);
+
+	return bridge;
+}
+EXPORT_SYMBOL(drm_get_sim_panel_bridge);
+
 #ifdef CONFIG_OF
 /**
  * devm_drm_of_get_bridge - Return next bridge in the chain
diff --git a/drivers/gpu/drm/drm_panel.c b/drivers/gpu/drm/drm_panel.c
index e814020bbcd3b..062541505fa74 100644
--- a/drivers/gpu/drm/drm_panel.c
+++ b/drivers/gpu/drm/drm_panel.c
@@ -290,6 +290,39 @@ int drm_panel_get_modes(struct drm_panel *panel,
 }
 EXPORT_SYMBOL(drm_panel_get_modes);
 
+/**
+ * drm_find_sim_panel - look up the simulated panel
+ *
+ * Searches for the simulated panel in the panel list.
+ *
+ * Return: A pointer to the simulated panel or an ERR_PTR() if the simulated
+ * panel was not found in the panel list.
+ *
+ * Possible error codes returned by this function:
+ * - EPROBE_DEFER: the panel device has not been probed yet, and the caller
+ *   should retry later
+*/
+struct drm_panel *drm_find_sim_panel(void)
+{
+	struct drm_panel *panel;
+
+	mutex_lock(&panel_lock);
+
+	list_for_each_entry(panel, &panel_list, list) {
+		bool is_sim_panel = !strncmp(panel->dev->driver->name,
+				"panel_simulation",
+				strlen("panel_simulation"));
+		if (is_sim_panel) {
+			mutex_unlock(&panel_lock);
+			return panel;
+		}
+	}
+
+	mutex_unlock(&panel_lock);
+	return ERR_PTR(-EPROBE_DEFER);
+}
+EXPORT_SYMBOL(drm_find_sim_panel);
+
 #ifdef CONFIG_OF
 /**
  * of_drm_find_panel - look up a panel using a device tree node
diff --git a/include/drm/drm_bridge.h b/include/drm/drm_bridge.h
index e39da5807ba71..941f1f825e2c6 100644
--- a/include/drm/drm_bridge.h
+++ b/include/drm/drm_bridge.h
@@ -927,6 +927,7 @@ static inline int drm_panel_bridge_set_orientation(struct drm_connector *connect
 }
 #endif
 
+struct drm_bridge *drm_get_sim_panel_bridge(struct device *dev);
 #if defined(CONFIG_OF) && defined(CONFIG_DRM_PANEL_BRIDGE)
 struct drm_bridge *devm_drm_of_get_bridge(struct device *dev, struct device_node *node,
 					  u32 port, u32 endpoint);
diff --git a/include/drm/drm_panel.h b/include/drm/drm_panel.h
index 10015891b056f..c3a5944c35a91 100644
--- a/include/drm/drm_panel.h
+++ b/include/drm/drm_panel.h
@@ -283,6 +283,7 @@ int drm_panel_enable(struct drm_panel *panel);
 int drm_panel_disable(struct drm_panel *panel);
 
 int drm_panel_get_modes(struct drm_panel *panel, struct drm_connector *connector);
+struct drm_panel *drm_find_sim_panel(void);
 
 #if defined(CONFIG_OF) && defined(CONFIG_DRM_PANEL)
 struct drm_panel *of_drm_find_panel(const struct device_node *np);

-- 
2.43.0