[PATCH 1/2] drm: Add few more wrapper functions for drm panel

[Deepak M]

Currently there are few pair of functions which
are called during the panel enable/disable sequence.
To improve the granularity, adding few more wrapper
functions so that the functions are more specific
on what they are doing.

Cc: Thierry Reding <thierry.reding at gmail.com>
Cc: David Airlie <airlied at linux.ie>
Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
Cc: Daniel Vetter <daniel.vetter at intel.com>
Cc: Jani Nikula <jani.nikula at intel.com>
Signed-off-by: Deepak M <m.deepak at intel.com>
Signed-off-by: Gaurav K Singh <gaurav.k.singh at intel.com>
---
 include/drm/drm_panel.h | 92 +++++++++++++++++++++++++++++++++++++++++--------
 1 file changed, 77 insertions(+), 15 deletions(-)

diff --git a/include/drm/drm_panel.h b/include/drm/drm_panel.h
index 13ff44b..dadbcea 100644
--- a/include/drm/drm_panel.h
+++ b/include/drm/drm_panel.h
@@ -33,23 +33,33 @@ struct display_timing;
 
 /**
  * struct drm_panel_funcs - perform operations on a given panel
- * @disable: disable panel (turn off back light, etc.)
- * @unprepare: turn off panel
- * @prepare: turn on panel and perform set up
- * @enable: enable panel (turn on back light, etc.)
+ * @disable: disable panel
+ * @unprepare: uninitialize the panel
+ * @prepare: initialze the panel
+ * @enable: enable panel
  * @get_modes: add modes to the connector that the panel is attached to and
  * return the number of modes added
  * @get_timings: copy display timings into the provided array and return
  * the number of display timings available
+ * @power_on: powering on the panel
+ * @power_off: powering off the panel
+ * @backlight_on: turning on backlight
+ * @backlight_off: turning off backlight
+ *
+ * The .power_on function is called to turn on the panel and wait for it to
+ * become ready.
  *
  * The .prepare() function is typically called before the display controller
- * starts to transmit video data. Panel drivers can use this to turn the panel
- * on and wait for it to become ready. If additional configuration is required
- * (via a control bus such as I2C, SPI or DSI for example) this is a good time
- * to do that.
+ * starts to transmit video data. Panels will be iniatilzed during this call.
+ * If additional configuration is required (via a control bus such as I2C,
+ * SPI or DSI for example) this is a good time to do that. Some panels expects
+ * to wait and also to send some cmds before enabling the panel.
+ *
+ * The .enable() will typically enable the panel, some DSI panels need
+ * additional operations to opearte in differnt modes other than initalizing.
  *
- * After the display controller has started transmitting video data, it's safe
- * to call the .enable() function. This will typically enable the backlight to
+ * The .backlight_on() After the display controller has started transmitting
+ * video data, it's safe to turn on the panel backlight, which will
  * make the image on screen visible. Some panels require a certain amount of
  * time or frames before the image is displayed. This function is responsible
  * for taking this into account before enabling the backlight to avoid visual
@@ -57,13 +67,20 @@ struct display_timing;
  *
  * Before stopping video transmission from the display controller it can be
  * necessary to turn off the panel to avoid visual glitches. This is done in
- * the .disable() function. Analogously to .enable() this typically involves
- * turning off the backlight and waiting for some time to make sure no image
- * is visible on the panel. It is then safe for the display controller to
- * cease transmission of video data.
+ * the .backlight_off() function, this typically involves turning off the
+ * backlight and waiting for some time to make sure no image is visible
+ * on the panel.
+ *
+ * .disable() function will cease transmission of video data.
+ *
+ * .unprepare() function will typically uninitalize the panel.
  *
  * To save power when no video data is transmitted, a driver can power down
- * the panel. This is the job of the .unprepare() function.
+ * the panel. This is the job of the .power_off() function.
+ *
+ * The below sequence can be followed while calling these ops
+ * Enable : power_on(), prepare(), enable(), backlight_on()
+ * Disable : backlight_off(), disable(), unprepare(), power_off()
  */
 struct drm_panel_funcs {
 	int (*disable)(struct drm_panel *panel);
@@ -73,6 +90,10 @@ struct drm_panel_funcs {
 	int (*get_modes)(struct drm_panel *panel);
 	int (*get_timings)(struct drm_panel *panel, unsigned int num_timings,
 			   struct display_timing *timings);
+	int (*power_on)(struct drm_panel *panel);
+	int (*power_off)(struct drm_panel *panel);
+	int (*backlight_on)(struct drm_panel *panel);
+	int (*backlight_off)(struct drm_panel *panel);
 };
 
 struct drm_panel {
@@ -117,6 +138,47 @@ static inline int drm_panel_enable(struct drm_panel *panel)
 	return panel ? -ENOSYS : -EINVAL;
 }
 
+static inline int drm_panel_power_on(struct drm_panel *panel)
+{
+	if (panel && panel->funcs && panel->funcs->power_on)
+		return panel->funcs->power_on(panel);
+
+	return panel ? -ENOSYS : -EINVAL;
+}
+
+static inline int drm_panel_power_off(struct drm_panel *panel)
+{
+	if (panel && panel->funcs && panel->funcs->power_off)
+		return panel->funcs->power_off(panel);
+
+	return panel ? -ENOSYS : -EINVAL;
+}
+
+static inline int drm_panel_backlight_on(struct drm_panel *panel)
+{
+	if (panel && panel->funcs && panel->funcs->backlight_on)
+		return panel->funcs->backlight_on(panel);
+
+	return panel ? -ENOSYS : -EINVAL;
+}
+
+static inline int drm_panel_backlight_off(struct drm_panel *panel)
+{
+	if (panel && panel->funcs && panel->funcs->backlight_off)
+		return panel->funcs->backlight_off(panel);
+
+	return panel ? -ENOSYS : -EINVAL;
+}
+
+static inline int drm_panel_get_info(struct drm_panel *panel,
+				struct drm_connector *connector)
+{
+	if (connector && panel && panel->funcs && panel->funcs->get_info)
+		return panel->funcs->get_info(panel, connector);
+
+	return panel ? -ENOSYS : -EINVAL;
+}
+
 static inline int drm_panel_get_modes(struct drm_panel *panel)
 {
 	if (panel && panel->funcs && panel->funcs->get_modes)
-- 
1.9.1