drm/panel: simple: Support delays in panel functions

For most of the panels, we need to provide delays during various stages
of panel power up and power down. Add a structure to hold those delay
values and use them in corresponding functions.

Signed-off-by: Ajay Kumar <ajaykumar.rs@samsung.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>

1 files changed, 30 insertions, 0 deletions

diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c
index 806beae77938..7798bdc9da54 100644
--- a/drivers/gpu/drm/panel/panel-simple.c
+++ b/drivers/gpu/drm/panel/panel-simple.c
@@ -43,6 +43,24 @@ struct panel_desc {
                 unsigned int width;
                 unsigned int height;
         } size;
+
+        /**
+         * @prepare: the time (in milliseconds) that it takes for the panel to
+         *           become ready and start receiving video data
+         * @enable: the time (in milliseconds) that it takes for the panel to
+         *          display the first valid frame after starting to receive
+         *          video data
+         * @disable: the time (in milliseconds) that it takes for the panel to
+         *           turn the display off (no content is visible)
+         * @unprepare: the time (in milliseconds) that it takes for the panel
+         *             to power itself down completely
+         */
+        struct {
+                unsigned int prepare;
+                unsigned int enable;
+                unsigned int disable;
+                unsigned int unprepare;
+        } delay;
 };
 
 struct panel_simple {
@@ -109,6 +127,9 @@ static int panel_simple_disable(struct drm_panel *panel)
                 backlight_update_status(p->backlight);
         }
 
+        if (p->desc->delay.disable)
+                msleep(p->desc->delay.disable);
+
         p->enabled = false;
 
         return 0;
@@ -126,6 +147,9 @@ static int panel_simple_unprepare(struct drm_panel *panel)
 
         regulator_disable(p->supply);
 
+        if (p->desc->delay.unprepare)
+                msleep(p->desc->delay.unprepare);
+
         p->prepared = false;
 
         return 0;
@@ -148,6 +172,9 @@ static int panel_simple_prepare(struct drm_panel *panel)
         if (p->enable_gpio)
                 gpiod_set_value_cansleep(p->enable_gpio, 1);
 
+        if (p->desc->delay.prepare)
+                msleep(p->desc->delay.prepare);
+
         p->prepared = true;
 
         return 0;
@@ -160,6 +187,9 @@ static int panel_simple_enable(struct drm_panel *panel)
         if (p->enabled)
                 return 0;
 
+        if (p->desc->delay.enable)
+                msleep(p->desc->delay.enable);
+
         if (p->backlight) {
                 p->backlight->props.power = FB_BLANK_UNBLANK;
                 backlight_update_status(p->backlight);