Re: [PATCH v2 1/9] drm/fb-helper: Eliminate the .best_encoder() usage

["Ville Syrjälä" <ville.syrjala@linux.intel.com>]

On Thu, Jun 28, 2018 at 11:27:07AM -0400, Alex Deucher wrote:
> On Thu, Jun 28, 2018 at 9:13 AM, Ville Syrjala
> <ville.syrjala@linux.intel.com> wrote:
> > From: Ville Syrjälä <ville.syrjala@linux.intel.com>
> >
> > 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.
> >
> > v2: Avoid oopsing on NULL encoders (Daniel)
> >     s/connector_crtc_ok/connector_has_possible_crtc/
> >
> > Cc: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
> > Cc: Harry Wentland <harry.wentland@amd.com>
> > Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
> > Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
> > Reviewed-by: Alex Deucher <alexander.deucher@amd.com> #v1
> > Suggested-by: Daniel Vetter <daniel.vetter@ffwll.ch>
> > Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
> 
> Series is:
> Reviewed-by: Alex Deucher <alexander.deucher@amd.com>

Thanks for the review. Series pushed to drm-misc-next.

> 
> > ---
> >  drivers/gpu/drm/drm_fb_helper.c | 41 ++++++++++++++++++++++++-----------------
> >  1 file changed, 24 insertions(+), 17 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
> > index cab14f253384..b37f06317d51 100644
> > --- a/drivers/gpu/drm/drm_fb_helper.c
> > +++ b/drivers/gpu/drm/drm_fb_helper.c
> > @@ -2323,6 +2323,27 @@ static bool drm_target_preferred(struct drm_fb_helper *fb_helper,
> >         return true;
> >  }
> >
> > +static bool connector_has_possible_crtc(struct drm_connector *connector,
> > +                                       struct drm_crtc *crtc)
> > +{
> > +       int i;
> > +
> > +       for (i = 0; i < DRM_CONNECTOR_MAX_ENCODER; i++) {
> > +               struct drm_encoder *encoder;
> > +
> > +               if (connector->encoder_ids[i] == 0)
> > +                       break;
> > +
> > +               encoder = drm_encoder_find(connector->dev, NULL,
> > +                                          connector->encoder_ids[i]);
> > +
> > +               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 +2352,6 @@ 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 +2382,6 @@ 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 +2389,8 @@ 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_has_possible_crtc(connector,
> > +                                                crtc->mode_set.crtc))
> >                         continue;
> >
> >                 for (o = 0; o < n; o++)
> > @@ -2410,7 +2417,7 @@ 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
> >
> > _______________________________________________
> > dri-devel mailing list
> > dri-devel@lists.freedesktop.org
> > https://lists.freedesktop.org/mailman/listinfo/dri-devel

-- 
Ville Syrjälä
Intel
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