On Tue, Jun 07, 2016 at 01:47:56PM +0200, Boris Brezillon wrote:
> Adapt drm_pick_crtcs() and update_connector_routing() to fallback to
> drm_atomic_helper_best_encoder() if funcs->best_encoder() is NULL so
> that DRM drivers can leave this hook unassigned if they know they want
> to use drm_atomic_helper_best_encoder().
>
> Update the vtables documentation accordingly.
>
> Signed-off-by: Boris Brezillon <boris.brezillon@xxxxxxxxxxxxxxxxxx>
Applied to drm-misc, thanks. I think I'll wait with the driver patches
until next week or so.
-Daniel
> ---
> drivers/gpu/drm/drm_atomic_helper.c | 4 +++-
> drivers/gpu/drm/drm_fb_helper.c | 13 ++++++++++++-
> include/drm/drm_modeset_helper_vtables.h | 10 ++++++++--
> 3 files changed, 23 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
> index f6a3350..849d029 100644
> --- a/drivers/gpu/drm/drm_atomic_helper.c
> +++ b/drivers/gpu/drm/drm_atomic_helper.c
> @@ -300,8 +300,10 @@ update_connector_routing(struct drm_atomic_state *state,
> if (funcs->atomic_best_encoder)
> new_encoder = funcs->atomic_best_encoder(connector,
> connector_state);
> - else
> + else if (funcs->best_encoder)
> new_encoder = funcs->best_encoder(connector);
> + else
> + new_encoder = drm_atomic_helper_best_encoder(connector);
>
> if (!new_encoder) {
> DRM_DEBUG_ATOMIC("No suitable encoder found for [CONNECTOR:%d:%s]\n",
> diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
> index 7c2eb75..d44389a 100644
> --- a/drivers/gpu/drm/drm_fb_helper.c
> +++ b/drivers/gpu/drm/drm_fb_helper.c
> @@ -2000,7 +2000,18 @@ static int drm_pick_crtcs(struct drm_fb_helper *fb_helper,
> my_score++;
>
> connector_funcs = connector->helper_private;
> - encoder = connector_funcs->best_encoder(connector);
> +
> + /*
> + * If the DRM device implements atomic hooks and ->best_encoder() is
> + * NULL we fallback to the default drm_atomic_helper_best_encoder()
> + * helper.
> + */
> + if (fb_helper->dev->mode_config.funcs->atomic_commit &&
> + !connector_funcs->best_encoder)
> + encoder = drm_atomic_helper_best_encoder(connector);
> + else
> + encoder = connector_funcs->best_encoder(connector);
> +
> if (!encoder)
> goto out;
>
> diff --git a/include/drm/drm_modeset_helper_vtables.h b/include/drm/drm_modeset_helper_vtables.h
> index d4619dc..4e7a53b 100644
> --- a/include/drm/drm_modeset_helper_vtables.h
> +++ b/include/drm/drm_modeset_helper_vtables.h
> @@ -736,6 +736,11 @@ struct drm_connector_helper_funcs {
> * inspect dynamic configuration state should instead use
> * @atomic_best_encoder.
> *
> + * You can leave this function to NULL if the connector is only
> + * attached to a single encoder and you are using the atomic helpers.
> + * In this case, the core will call drm_atomic_helper_best_encoder()
> + * for you.
> + *
> * RETURNS:
> *
> * Encoder that should be used for the given connector and connector
> @@ -752,8 +757,9 @@ struct drm_connector_helper_funcs {
> * need to select the best encoder depending upon the desired
> * configuration and can't select it statically.
> *
> - * This function is used by drm_atomic_helper_check_modeset() and either
> - * this or @best_encoder is required.
> + * This function is used by drm_atomic_helper_check_modeset().
> + * If it is not implemented, the core will fallback to @best_encoder
> + * (or drm_atomic_helper_best_encoder() if @best_encoder is NULL).
> *
> * NOTE:
> *
> --
> 2.7.4
>
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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