Hi Ajay,
[RESEND with reconstructed mail receivers, sorry for noise]
I am glad we have finally more fine-grained callbacks. Just few nitpicks.
On 07/31/2014 07:42 PM, Ajay Kumar wrote:
Most of the panels need an init sequence as mentioned below: -- poweron LCD unit/LCD_EN -- start video data -- poweron LED unit/BACKLIGHT_EN And, a de-init sequence as mentioned below: -- poweroff LED unit/BACKLIGHT_EN -- stop video data -- poweroff LCD unit/LCD_EN With existing callbacks for drm panel, we cannot accomodate such panels, since only two callbacks, i.e "panel_enable" and panel_disable are supported.
This patch adds: -- "prepare" callback which can be called before the actual video data is on, and then call the "enable" callback after the video data is available.
-- "unprepare" callback which can be called after the video data is off, and use "disable" callback to do something before switching off the video data.
Now, we can easily map the above scenario as shown below: poweron LCD unit/LCD_EN = "prepare" callback poweron LED unit/BACKLIGHT_EN = "enable" callback poweroff LED unit/BACKLIGHT_EN = "disable" callback poweroff LCD unit/LCD_EN = "unprepare" callback
Signed-off-by: Ajay Kumar ajaykumar.rs-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org
include/drm/drm_panel.h | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+)
diff --git a/include/drm/drm_panel.h b/include/drm/drm_panel.h index c2ab77a..9addc69 100644 --- a/include/drm/drm_panel.h +++ b/include/drm/drm_panel.h @@ -31,7 +31,9 @@ struct drm_device; struct drm_panel;
struct drm_panel_funcs {
- int (*unprepare)(struct drm_panel *panel); int (*disable)(struct drm_panel *panel);
- int (*prepare)(struct drm_panel *panel); int (*enable)(struct drm_panel *panel); int (*get_modes)(struct drm_panel *panel);
}; @@ -46,6 +48,14 @@ struct drm_panel { struct list_head list; };
+static inline int drm_panel_unprepare(struct drm_panel *panel) +{
- if (panel && panel->funcs && panel->funcs->unprepare)
return panel->funcs->unprepare(panel);- return panel ? -ENOSYS : -EINVAL;
+}
Wouldn't be better to return 0 in case there is no callback. In such case we could avoid implementing ugly dummy callbacks in each panel driver. This is true for all prepare/unprepare/enable/disable callbacks.
Regards Andrzej
static inline int drm_panel_disable(struct drm_panel *panel) { if (panel && panel->funcs && panel->funcs->disable) @@ -54,6 +64,14 @@ static inline int drm_panel_disable(struct drm_panel *panel) return panel ? -ENOSYS : -EINVAL; }
+static inline int drm_panel_prepare(struct drm_panel *panel) +{
- if (panel && panel->funcs && panel->funcs->prepare)
return panel->funcs->prepare(panel);- return panel ? -ENOSYS : -EINVAL;
+}
static inline int drm_panel_enable(struct drm_panel *panel) { if (panel && panel->funcs && panel->funcs->enable)