Re: [RFC PATCH 1/2] drm: Introduce drm_panel_prepare_for_mode callback

[Dmitry Baryshkov]

On Sun, Apr 12, 2026 at 08:00:44AM -0300, Val Packett wrote:
> Modern OLED panels often need to vary their prepare commands based on the
> mode being set (resolution and refresh rate). Introduce a new variant of
> the drm_panel_prepare callback that passes the chosen mode as an argument
> to allow for this.
> 
> Signed-off-by: Val Packett <val@xxxxxxxxxxxx>
> ---
>  drivers/gpu/drm/bridge/panel.c |  8 ++++++--
>  drivers/gpu/drm/drm_panel.c    | 15 +++++++++++++--
>  include/drm/drm_panel.h        | 12 ++++++++++++
>  3 files changed, 31 insertions(+), 4 deletions(-)
> 

A (somewhat) better approach would be to let add .atomic_foo callbacks,
which would receive drm_atomic_state instance. See  the discussion
around [1].

[1] https://lore.kernel.org/dri-devel/nfc6ih43gjpi5u67fpkkxgwwygv53grdldq7tfp5iiukrkiy2u@53fsrtezzkyt/

-- 
With best wishes
Dmitry