On Wed, Jun 27, 2018 at 11:03:31AM +0200, Daniel Vetter wrote:
> On Tue, Jun 26, 2018 at 08:47:07PM +0300, Ville Syrjala wrote:
> > From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
> >
> > Instead of using the .best_encoder() hook to figure out whether a given
> > connector+crtc combo will work, let's instead do what userspace does and
> > just iterate over all the encoders for the connector, and then check
> > each crtc against each encoder's possible_crtcs bitmask.
> >
> > Cc: Dhinakaran Pandiyan <dhinakaran.pandiyan@xxxxxxxxx>
> > Cc: Harry Wentland <harry.wentland@xxxxxxx>
> > Cc: Daniel Vetter <daniel.vetter@xxxxxxxx>
> > Acked-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
> > Suggested-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
> > Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
> > ---
> > drivers/gpu/drm/drm_fb_helper.c | 36 +++++++++++++++++++-----------------
> > 1 file changed, 19 insertions(+), 17 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
> > index cab14f253384..61c39cd75a27 100644
> > --- a/drivers/gpu/drm/drm_fb_helper.c
> > +++ b/drivers/gpu/drm/drm_fb_helper.c
> > @@ -2323,6 +2323,23 @@ static bool drm_target_preferred(struct drm_fb_helper *fb_helper,
> > return true;
> > }
> >
> > +static bool connector_crtc_ok(struct drm_connector *connector,
> > + struct drm_crtc *crtc)
> > +{
> > + int i;
> > +
> > + for (i = 0; i < DRM_CONNECTOR_MAX_ENCODER; i++) {
> > + struct drm_encoder *encoder =
> > + drm_encoder_find(connector->dev, NULL,
> > + connector->encoder_ids[i]);
> > +
>
> Shouldn't we also check for encoder != NULL here? Just for the case where
> a connector does not work on the given crtc, where we do expect to
> actually run off the end of the valid entries in the array.
Yeah. This one is obviously crap. Originally I had it after the
for_each_encoder_ids() thing so didn't need any checks, but then
thought I should move it before just in case people don't like
that particular macro. And apparently forgot to think when doing
that.
>
> With that fixed:
>
> Reviewed-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
>
> > + if (encoder->possible_crtcs & drm_crtc_mask(crtc))
> > + return true;
> > + }
> > +
> > + return false;
> > +}
> > +
> > static int drm_pick_crtcs(struct drm_fb_helper *fb_helper,
> > struct drm_fb_helper_crtc **best_crtcs,
> > struct drm_display_mode **modes,
> > @@ -2331,7 +2348,6 @@ static int drm_pick_crtcs(struct drm_fb_helper *fb_helper,
> > int c, o;
> > struct drm_connector *connector;
> > const struct drm_connector_helper_funcs *connector_funcs;
> > - struct drm_encoder *encoder;
> > int my_score, best_score, score;
> > struct drm_fb_helper_crtc **crtcs, *crtc;
> > struct drm_fb_helper_connector *fb_helper_conn;
> > @@ -2362,20 +2378,6 @@ static int drm_pick_crtcs(struct drm_fb_helper *fb_helper,
> >
> > connector_funcs = connector->helper_private;
> >
> > - /*
> > - * If the DRM device implements atomic hooks and ->best_encoder() is
> > - * NULL we fallback to the default drm_atomic_helper_best_encoder()
> > - * helper.
> > - */
> > - if (drm_drv_uses_atomic_modeset(fb_helper->dev) &&
> > - !connector_funcs->best_encoder)
> > - encoder = drm_atomic_helper_best_encoder(connector);
> > - else
> > - encoder = connector_funcs->best_encoder(connector);
> > -
> > - if (!encoder)
> > - goto out;
> > -
> > /*
> > * select a crtc for this connector and then attempt to configure
> > * remaining connectors
> > @@ -2383,7 +2385,7 @@ static int drm_pick_crtcs(struct drm_fb_helper *fb_helper,
> > for (c = 0; c < fb_helper->crtc_count; c++) {
> > crtc = &fb_helper->crtc_info[c];
> >
> > - if ((encoder->possible_crtcs & (1 << c)) == 0)
> > + if (!connector_crtc_ok(connector, crtc->mode_set.crtc))
> > continue;
> >
> > for (o = 0; o < n; o++)
> > @@ -2410,7 +2412,7 @@ static int drm_pick_crtcs(struct drm_fb_helper *fb_helper,
> > sizeof(struct drm_fb_helper_crtc *));
> > }
> > }
> > -out:
> > +
> > kfree(crtcs);
> > return best_score;
> > }
> > --
> > 2.16.4
> >
>
> --
> Daniel Vetter
> Software Engineer, Intel Corporation
> http://blog.ffwll.ch
--
Ville Syrjälä
Intel
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