From 9f774c42a908affba615bbed7463dd4f904dd5f1 Mon Sep 17 00:00:00 2001
From: Jocelyn Falempe <jfalempe@redhat.com>
Date: Wed, 17 Jul 2024 10:48:39 +0200
Subject: [PATCH] drm/panic: Add drm_panic_is_enabled()
It allows to check if the drm device supports drm_panic.
Prepare the work to have better integration with fbcon and vtconsole.
Signed-off-by: Jocelyn Falempe <jfalempe@redhat.com>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20240717090102.968152-2-jfalempe@redhat.com
---
drivers/gpu/drm/drm_crtc_internal.h | 7 +++++++
drivers/gpu/drm/drm_panic.c | 20 ++++++++++++++++++++
2 files changed, 27 insertions(+)
diff --git a/drivers/gpu/drm/drm_crtc_internal.h b/drivers/gpu/drm/drm_crtc_internal.h
index 20e9d7b206a21..c10de39cbe831 100644
--- a/drivers/gpu/drm/drm_crtc_internal.h
+++ b/drivers/gpu/drm/drm_crtc_internal.h
@@ -317,4 +317,11 @@ drm_edid_load_firmware(struct drm_connector *connector)
}
#endif
+/* drm_panic.c */
+#ifdef CONFIG_DRM_PANIC
+bool drm_panic_is_enabled(struct drm_device *dev);
+#else
+bool drm_panic_is_enabled(struct drm_device *dev) {return false; }
+#endif
+
#endif /* __DRM_CRTC_INTERNAL_H__ */
diff --git a/drivers/gpu/drm/drm_panic.c b/drivers/gpu/drm/drm_panic.c
index 8794c7f6c0eef..9f1a3568e62de 100644
--- a/drivers/gpu/drm/drm_panic.c
+++ b/drivers/gpu/drm/drm_panic.c
@@ -703,6 +703,26 @@ static void debugfs_register_plane(struct drm_plane *plane, int index)
static void debugfs_register_plane(struct drm_plane *plane, int index) {}
#endif /* CONFIG_DRM_PANIC_DEBUG */
+/**
+ * drm_panic_is_enabled
+ * @dev: the drm device that may supports drm_panic
+ *
+ * returns true if the drm device supports drm_panic
+ */
+bool drm_panic_is_enabled(struct drm_device *dev)
+{
+ struct drm_plane *plane;
+
+ if (!dev->mode_config.num_total_plane)
+ return false;
+
+ drm_for_each_plane(plane, dev)
+ if (plane->helper_private && plane->helper_private->get_scanout_buffer)
+ return true;
+ return false;
+}
+EXPORT_SYMBOL(drm_panic_is_enabled);
+
/**
* drm_panic_register() - Initialize DRM panic for a device
* @dev: the drm device on which the panic screen will be displayed.
--
GitLab