Hi Ajay,
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@xxxxxxxxxxx>
> ---
> 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)
>
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