Re: [PATCH V2 3/4] drm/panel: Add prepare_upstream_first flag to drm_panel

[Jagan Teki <jagan@amarulasolutions.com>]

On Fri, Mar 4, 2022 at 8:48 PM Dave Stevenson
<dave.stevenson@raspberrypi.com> wrote:
>
> Mapping to the drm_bridge flag pre_enable_upstream_first,
> add a new flag prepare_upstream_first to drm_panel to allow
> the panel driver to request that the upstream bridge should
> be pre_enabled before the panel prepare.
>
> Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
> ---
>  drivers/gpu/drm/bridge/panel.c |  3 +++
>  include/drm/drm_panel.h        | 10 ++++++++++
>  2 files changed, 13 insertions(+)
>
> diff --git a/drivers/gpu/drm/bridge/panel.c b/drivers/gpu/drm/bridge/panel.c
> index 5be057575183..2ea08b3ba326 100644
> --- a/drivers/gpu/drm/bridge/panel.c
> +++ b/drivers/gpu/drm/bridge/panel.c
> @@ -234,6 +234,9 @@ struct drm_bridge *drm_panel_bridge_add_typed(struct drm_panel *panel,
>         panel_bridge->bridge.ops = DRM_BRIDGE_OP_MODES;
>         panel_bridge->bridge.type = connector_type;
>
> +       panel_bridge->bridge.pre_enable_upstream_first =
> +                                               panel->prepare_upstream_first;
> +

panel_bridge is common for bridge users who used panel and those who
might not need upstream first, so better to handle per bridge user
whoever needs this.

Thanks,
Jagan.