Linus Walleij <linus.wall...@linaro.org> writes:
> The PL111 needs to filter valid modes based on memory bandwidth.
> I guess it is a pretty simple operation, so we can still claim
> the DRM KMS helper pipeline is simple after adding this (optional)
> vtable callback.
>
> Signed-off-by: Linus Walleij <linus.wall...@linaro.org>
> ---
> drivers/gpu/drm/drm_simple_kms_helper.c | 15 +++++++++++++++
> include/drm/drm_simple_kms_helper.h | 15 +++++++++++++++
> 2 files changed, 30 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_simple_kms_helper.c
> b/drivers/gpu/drm/drm_simple_kms_helper.c
> index dc9fd109de14..b7840cf34808 100644
> --- a/drivers/gpu/drm/drm_simple_kms_helper.c
> +++ b/drivers/gpu/drm/drm_simple_kms_helper.c
> @@ -34,6 +34,20 @@ static const struct drm_encoder_funcs
> drm_simple_kms_encoder_funcs = {
> .destroy = drm_encoder_cleanup,
> };
>
> +static enum drm_mode_status
> +drm_simple_kms_crtc_mode_valid(struct drm_crtc *crtc,
> + const struct drm_display_mode *mode)
> +{
> + struct drm_simple_display_pipe *pipe;
> +
> + pipe = container_of(crtc, struct drm_simple_display_pipe, crtc);
> + if (!pipe->funcs || !pipe->funcs->mode_valid)
> + /* Anything goes */
> + return MODE_OK;
> +
> + return pipe->funcs->mode_valid(crtc, mode);
> +}
> +
> static int drm_simple_kms_crtc_check(struct drm_crtc *crtc,
> struct drm_crtc_state *state)
> {
> @@ -72,6 +86,7 @@ static void drm_simple_kms_crtc_disable(struct drm_crtc
> *crtc,
> }
>
> static const struct drm_crtc_helper_funcs drm_simple_kms_crtc_helper_funcs =
> {
> + .mode_valid = drm_simple_kms_crtc_mode_valid,
> .atomic_check = drm_simple_kms_crtc_check,
> .atomic_enable = drm_simple_kms_crtc_enable,
> .atomic_disable = drm_simple_kms_crtc_disable,
> diff --git a/include/drm/drm_simple_kms_helper.h
> b/include/drm/drm_simple_kms_helper.h
> index 6d9adbb46293..ad74cb33c539 100644
> --- a/include/drm/drm_simple_kms_helper.h
> +++ b/include/drm/drm_simple_kms_helper.h
> @@ -21,6 +21,21 @@ struct drm_simple_display_pipe;
> * display pipeline
> */
> struct drm_simple_display_pipe_funcs {
> + /**
> + * @mode_valid:
> + *
> + * This function is called to filter out valid modes from the
> + * suggestions suggested by the bridge or display. This optional
> + * hook is passed in when initializing the pipeline.
> + *
> + * RETURNS:
> + *
> + * MODE_OK if the mode is acceptable.
> + * MODE_BAD if we need to try something else.
> + */I don't see why MODE_BAD would be the only valid error return from this hook. Can we just use the same RETURNS docs as other mode_valid methods? Other than that, Reviewed-by: Eric Anholt <e...@anholt.net> > + enum drm_mode_status (*mode_valid)(struct drm_crtc *crtc, > + const struct drm_display_mode *mode); > + > /** > * @enable: > * > -- > 2.14.3
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