[PATCH] drm: simple_kms_helper: Add mode_valid() callback support

[Daniel Vetter]

On Tue, Feb 20, 2018 at 10:52:46AM +0100, Thierry Reding wrote:
> On Tue, Feb 20, 2018 at 08:28:59AM +0100, Linus Walleij wrote:
> > 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.
> > 
> > Reviewed-by: Eric Anholt <eric at anholt.net>
> > Reviewed-by: Daniel Vetter <daniel.vetter at ffwll.ch>
> > Signed-off-by: Linus Walleij <linus.walleij at linaro.org>
> > ---
> > ChangeLog v1->v2:
> > - Fix up the kerneldoc to just refer to the enum.
> > - Collect Eric's and Daniel's review tags.
> > ---
> >  drivers/gpu/drm/drm_simple_kms_helper.c | 15 +++++++++++++++
> >  include/drm/drm_simple_kms_helper.h     | 14 ++++++++++++++
> >  2 files changed, 29 insertions(+)
> > 
> > diff --git a/drivers/gpu/drm/drm_simple_kms_helper.c b/drivers/gpu/drm/drm_simple_kms_helper.c
> > index 9f3b1c94802b..652cde9a5a6b 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..d9e4c3c3f009 100644
> > --- a/include/drm/drm_simple_kms_helper.h
> > +++ b/include/drm/drm_simple_kms_helper.h
> > @@ -21,6 +21,20 @@ 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
> 
> This is a little awkward to read. Perhaps something like "... filter out
> valid modes from those suggested by..."?

If you want to respin the kerneldoc I suggest you align more with the one
for drm_crtc_helper_funcs.mode_valid. There's a bunch of things you're
missing here. I think for consistency probably best to just copypaste the
entire thing, with an s/crtc/simple display pipe/ or similar.
-Daniel


> 
> Otherwise looks good:
> 
> Reviewed-by: Thierry Reding <treding at nvidia.com>



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-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch