linux-kernel - [PATCH RFC 2/4] drm/dsi: Add API to register simulated DSI panel

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Date: Tue, 16 Jan 2024 14:22:05 -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 2/4] drm/dsi: Add API to register simulated DSI panel

Add new APIs to register a simulated panel.

For drivers that want to support a simulated panel, they must call
mipi_dsi_host_register_sim_panel().

Signed-off-by: Jessica Zhang <quic_jesszhan@...cinc.com>
---
 drivers/gpu/drm/drm_mipi_dsi.c | 30 ++++++++++++++++++++++++++++++
 include/drm/drm_mipi_dsi.h     |  1 +
 2 files changed, 31 insertions(+)

diff --git a/drivers/gpu/drm/drm_mipi_dsi.c b/drivers/gpu/drm/drm_mipi_dsi.c
index 843a6dbda93a0..6996014990979 100644
--- a/drivers/gpu/drm/drm_mipi_dsi.c
+++ b/drivers/gpu/drm/drm_mipi_dsi.c
@@ -153,6 +153,24 @@ static int mipi_dsi_device_add(struct mipi_dsi_device *dsi)
 	return device_add(&dsi->dev);
 }
 
+#if IS_ENABLED(CONFIG_DRM_PANEL_SIMULATION)
+static struct mipi_dsi_device *mipi_dsi_device_add_sim_panel(struct mipi_dsi_host *host)
+{
+	struct mipi_dsi_device_info info = { };
+
+	info.channel = 0;
+	info.node = NULL;
+	strscpy(info.type, "panel_simulation", sizeof(info.type));
+
+	return mipi_dsi_device_register_full(host, &info);
+}
+#else
+static struct mipi_dsi_device *mipi_dsi_device_add_sim_panel(struct mipi_dsi_host *host)
+{
+	return ERR_PTR(-ENODEV);
+}
+#endif
+
 #if IS_ENABLED(CONFIG_OF)
 static struct mipi_dsi_device *
 of_mipi_dsi_device_add(struct mipi_dsi_host *host, struct device_node *node)
@@ -324,6 +342,18 @@ struct mipi_dsi_host *of_find_mipi_dsi_host_by_node(struct device_node *node)
 }
 EXPORT_SYMBOL(of_find_mipi_dsi_host_by_node);
 
+int mipi_dsi_host_register_sim_panel(struct mipi_dsi_host *host)
+{
+	mipi_dsi_device_add_sim_panel(host);
+
+	mutex_lock(&host_lock);
+	list_add_tail(&host->list, &host_list);
+	mutex_unlock(&host_lock);
+
+	return 0;
+}
+EXPORT_SYMBOL(mipi_dsi_host_register_sim_panel);
+
 int mipi_dsi_host_register(struct mipi_dsi_host *host)
 {
 	struct device_node *node;
diff --git a/include/drm/drm_mipi_dsi.h b/include/drm/drm_mipi_dsi.h
index c0aec0d4d664e..4ca44b7b3efdb 100644
--- a/include/drm/drm_mipi_dsi.h
+++ b/include/drm/drm_mipi_dsi.h
@@ -107,6 +107,7 @@ struct mipi_dsi_host {
 	struct list_head list;
 };
 
+int mipi_dsi_host_register_sim_panel(struct mipi_dsi_host *host);
 int mipi_dsi_host_register(struct mipi_dsi_host *host);
 void mipi_dsi_host_unregister(struct mipi_dsi_host *host);
 struct mipi_dsi_host *of_find_mipi_dsi_host_by_node(struct device_node *node);

-- 
2.43.0