On Fri, Feb 07, 2020 at 03:59:45PM +0200, Ville Syrjala wrote:
> From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
>
> The docs say possible_clones should always include the encoder itself.
> Since most drivers don't want to deal with the complexities of cloning
> let's allow them to set possible_clones=0 and instead we'll fix that
> up in the core.
>
> We can't put this special case into drm_encoder_init() because drivers
> will have to fill up possible_clones after adding all the relevant
> encoders. Otherwise they wouldn't know the proper encoder indexes to
> use. So we'll just do it just before registering the encoders.
>
> TODO: Should we do something similar for possible_crtcs==0?
>
> Cc: Thomas Zimmermann <tzimmermann@xxxxxxx>
> Cc: Daniel Vetter <daniel@xxxxxxxx>
> Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
> ---
> drivers/gpu/drm/drm_encoder.c | 15 +++++++++++++++
> 1 file changed, 15 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_encoder.c b/drivers/gpu/drm/drm_encoder.c
> index e555281f43d4..f761d9306028 100644
> --- a/drivers/gpu/drm/drm_encoder.c
> +++ b/drivers/gpu/drm/drm_encoder.c
> @@ -66,11 +66,26 @@ static const struct drm_prop_enum_list drm_encoder_enum_list[] = {
> { DRM_MODE_ENCODER_DPI, "DPI" },
> };
>
> +/*
> + * For some reason we want the encoder itself included in
> + * possible_clones. Make life easy for drivers by allowing them
> + * to leave possible_clones unset if no cloning is possible.
> + */
> +static void fixup_possible_clones(struct drm_device *dev)
> +{
> + struct drm_encoder *encoder;
> +
> + drm_for_each_encoder(encoder, dev)
> + encoder->possible_clones |= drm_encoder_mask(encoder);
> +}
> +
> int drm_encoder_register_all(struct drm_device *dev)
> {
> struct drm_encoder *encoder;
> int ret = 0;
>
> + fixup_possible_clones(dev);
This is way too late, we've already registered the chardev minors at this
point. I think we need a new drm_mode_config_validate() at the top of
drm_dev_register, but which does _not_ run when the driver has a ->load
callback (which soon will be no driver at all).
Cheers, Daniel
> +
> drm_for_each_encoder(encoder, dev) {
> if (encoder->funcs->late_register)
> ret = encoder->funcs->late_register(encoder);
> --
> 2.24.1
>
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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