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drm/panic: Add drm_panic_is_enabled()

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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
This commit is contained in:
Jocelyn Falempe 2024-07-17 10:48:39 +02:00
parent ef82428612
commit 9f774c42a9
2 changed files with 27 additions and 0 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

7
drivers/gpu/drm/drm_crtc_internal.h
View file

@ -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__ */

20
drivers/gpu/drm/drm_panic.c
View file

@ -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.