Most of the panels need an init sequence as mentioned below:
-- poweron LCD unit/LCD_EN
-- start video data
-- poweron LED unit/BL_EN
With existing callbacks for drm panel, we cannot accomodate such
panels, since only one callback, i.e "panel_enable" is supported.
This patch adds a "pre_enable" callback which can be called before
the actual video data is on, and then call the "enable" callback
after the video data is available.
Signed-off-by: Ajay Kumar <ajaykumar.rs@xxxxxxxxxxx>
---
include/drm/drm_panel.h | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/include/drm/drm_panel.h b/include/drm/drm_panel.h
index c2ab77a..89210bf 100644
--- a/include/drm/drm_panel.h
+++ b/include/drm/drm_panel.h
@@ -32,6 +32,7 @@ struct drm_panel;
struct drm_panel_funcs {
int (*disable)(struct drm_panel *panel);
+ int (*pre_enable)(struct drm_panel *panel);
int (*enable)(struct drm_panel *panel);
int (*get_modes)(struct drm_panel *panel);
};
@@ -54,6 +55,14 @@ static inline int drm_panel_disable(struct drm_panel *panel)
return panel ? -ENOSYS : -EINVAL;
}
+static inline int drm_panel_pre_enable(struct drm_panel *panel)
+{
+ if (panel && panel->funcs && panel->funcs->pre_enable)
+ return panel->funcs->pre_enable(panel);
+
+ return panel ? -ENOSYS : -EINVAL;
+}
+
static inline int drm_panel_enable(struct drm_panel *panel)
{
if (panel && panel->funcs && panel->funcs->enable)
--
1.8.1.2
--
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