For most of the panels, we need to provide delays during
various stages of panel powerup/powerdown.
So, Add a structure to hold those delay values and use them
in corresponding functions.
Signed-off-by: Ajay Kumar <ajaykumar...@samsung.com>
---
drivers/gpu/drm/panel/panel-simple.c | 30 ++++++++++++++++++++++++++++++
1 file changed, 30 insertions(+)
diff --git a/drivers/gpu/drm/panel/panel-simple.c
b/drivers/gpu/drm/panel/panel-simple.c
index 9801728..d6e92ea 100644
--- a/drivers/gpu/drm/panel/panel-simple.c
+++ b/drivers/gpu/drm/panel/panel-simple.c
@@ -41,6 +41,24 @@ 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 down itself completely
+ */
+ struct {
+ unsigned int prepare;
+ unsigned int enable;
+ unsigned int disable;
+ unsigned int unprepare;
+ } delay;
};
struct panel_simple {
@@ -106,6 +124,9 @@ 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;
@@ -123,6 +144,9 @@ 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;
@@ -145,6 +169,9 @@ 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;
@@ -157,6 +184,9 @@ 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);
--
1.7.9.5
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