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Commit 3c8a7d12 authored by Shashank Babu Chinta Venkata's avatar Shashank Babu Chinta Venkata Committed by Alistair Delva
Browse files

ANDROID: driver: gpu: drm: add notifier for panel related events 



Add support for notfier of panel blank/unblank events.
This allows external drivers such as touch, backlight
drivers etc to subscribe to panel related events.

Signed-off-by: default avatarShashank Babu Chinta Venkata <sbchin@codeaurora.org>
Bug: 139653858
Change-Id: I3ac644c1c931b959a511ee4a999a417a4b7bdcd1
parent 580ab004

drivers/gpu/drm/drm_panel.c

+22 −0
Original line number Diff line number Diff line
@@ -48,6 +48,7 @@ static LIST_HEAD(panel_list); 
void drm_panel_init(struct drm_panel *panel)

{

	INIT_LIST_HEAD(&panel->list);

	BLOCKING_INIT_NOTIFIER_HEAD(&panel->nh);

}

EXPORT_SYMBOL(drm_panel_init);
@@ -169,6 +170,27 @@ struct drm_panel *of_drm_find_panel(const struct device_node *np) 
EXPORT_SYMBOL(of_drm_find_panel);

#endif



int drm_panel_notifier_register(struct drm_panel *panel,

	struct notifier_block *nb)

{

	return blocking_notifier_chain_register(&panel->nh, nb);

}

EXPORT_SYMBOL(drm_panel_notifier_register);



int drm_panel_notifier_unregister(struct drm_panel *panel,

	struct notifier_block *nb)

{

	return blocking_notifier_chain_unregister(&panel->nh, nb);

}

EXPORT_SYMBOL(drm_panel_notifier_unregister);



int drm_panel_notifier_call_chain(struct drm_panel *panel,

	unsigned long val, void *v)

{

	return blocking_notifier_call_chain(&panel->nh, val, v);

}

EXPORT_SYMBOL(drm_panel_notifier_call_chain);



MODULE_AUTHOR("Thierry Reding <treding@nvidia.com>");

MODULE_DESCRIPTION("DRM panel infrastructure");

MODULE_LICENSE("GPL and additional rights");

include/drm/drm_connector.h

+9 −0
Original line number Diff line number Diff line
@@ -39,6 +39,7 @@ struct drm_encoder; 
struct drm_property;

struct drm_property_blob;

struct drm_printer;

struct drm_panel;

struct edid;



enum drm_connector_force {
@@ -497,6 +498,7 @@ struct drm_connector_state { 
	struct drm_writeback_job *writeback_job;



	/**



	 * @hdr_output_metadata:

	 * DRM blob property for HDR output metadata

	 */
@@ -1174,6 +1176,13 @@ struct drm_connector { 
	/* HDR metdata */

	struct hdr_output_metadata hdr_output_metadata;

	struct hdr_sink_metadata hdr_sink_metadata;



	/**

	 * @panel:

	 *

	 * Can find the panel which connected to drm_connector.

	 */

	struct drm_panel *panel;

};



#define obj_to_connector(x) container_of(x, struct drm_connector, base)

include/drm/drm_panel.h

+31 −0
Original line number Diff line number Diff line
@@ -27,6 +27,23 @@ 
#include <linux/err.h>

#include <linux/errno.h>

#include <linux/list.h>

#include <linux/notifier.h>



/* A hardware display blank change occurred */

#define DRM_PANEL_EVENT_BLANK		0x01

/* A hardware display blank early change occurred */

#define DRM_PANEL_EARLY_EVENT_BLANK	0x02



enum {

	/* panel: power on */

	DRM_PANEL_BLANK_UNBLANK,

	/* panel: power off */

	DRM_PANEL_BLANK_POWERDOWN,

};



struct drm_panel_notifier {

	void *data;

};



struct device_node;

struct drm_connector;
@@ -94,6 +111,13 @@ struct drm_panel { 
	const struct drm_panel_funcs *funcs;



	struct list_head list;



	/**

	 * @nh:

	 *

	 * panel notifier list head

	 */

	struct blocking_notifier_head nh;

};



/**
@@ -195,6 +219,13 @@ void drm_panel_remove(struct drm_panel *panel); 
int drm_panel_attach(struct drm_panel *panel, struct drm_connector *connector);

int drm_panel_detach(struct drm_panel *panel);



int drm_panel_notifier_register(struct drm_panel *panel,

	struct notifier_block *nb);

int drm_panel_notifier_unregister(struct drm_panel *panel,

	struct notifier_block *nb);

int drm_panel_notifier_call_chain(struct drm_panel *panel,

	unsigned long val, void *v);



#if defined(CONFIG_OF) && defined(CONFIG_DRM_PANEL)

struct drm_panel *of_drm_find_panel(const struct device_node *np);

#else