On Fri, Dec 13, 2019 at 10:05:49PM +0200, Ville Syrjälä wrote:
> On Wed, Dec 11, 2019 at 01:14:23PM -0800, Manasi Navare wrote:
> > In case of tiled displays, all the tiles are linke dto each other
> > for transcoder port sync. So in intel_atomic_check() we need to make
> > sure that we add all the tiles to the modeset and if one of the
> > tiles needs a full modeset then mark all other tiles for a full modeset.
> >
> > Suggested-by: Ville Syrjälä <ville.syrj...@linux.intel.com>
> > Cc: Ville Syrjälä <ville.syrj...@linux.intel.com>
> > Cc: José Roberto de Souza <jose.so...@intel.com>
> > Bugzilla: https://gitlab.freedesktop.org/drm/intel/issues/5
> > Signed-off-by: Manasi Navare <manasi.d.nav...@intel.com>
> > ---
> > drivers/gpu/drm/i915/display/intel_display.c | 78 ++++++++++++++++++++
> > 1 file changed, 78 insertions(+)
> >
> > diff --git a/drivers/gpu/drm/i915/display/intel_display.c
> > b/drivers/gpu/drm/i915/display/intel_display.c
> > index 803993a01ca7..7263eaa66cda 100644
> > --- a/drivers/gpu/drm/i915/display/intel_display.c
> > +++ b/drivers/gpu/drm/i915/display/intel_display.c
> > @@ -14066,6 +14066,80 @@ static int intel_atomic_check_crtcs(struct
> > intel_atomic_state *state)
> > return 0;
> > }
> >
> > +static int
> > +intel_dp_modeset_all_tiles(struct drm_i915_private *dev_priv,
> > + struct intel_atomic_state *state, int tile_grp_id)
> > +{
> > + struct drm_connector *conn_iter;
> 'connector'
Ok
> > + struct drm_connector_list_iter conn_list_iter;
> > + struct drm_crtc_state *crtc_state;
>
> crtc_state has needlessly wide scope.
Ok will add it inside the loop
>
> > +
> > + drm_connector_list_iter_begin(&dev_priv->drm, &conn_list_iter);
> > + drm_for_each_connector_iter(conn_iter, &conn_list_iter) {
> > + struct drm_connector_state *conn_iter_state;
>
> 'conn_state' is the most popular name.
>
> > +
> > + if (!conn_iter->has_tile)
> > + continue;
> > + conn_iter_state = drm_atomic_get_connector_state(&state->base,
> > + conn_iter);
> > + if (IS_ERR(conn_iter_state)) {
> > + drm_connector_list_iter_end(&conn_list_iter);
> > + return PTR_ERR(conn_iter_state);
> > + }
> > +
> > + if (!conn_iter_state->crtc)
> > + continue;
> > +
> > + if (conn_iter->tile_group->id != tile_grp_id)
> > + continue;
>
> The tile group check should be part of the same if with the has_tile
> check.
Ok yes. So not pass the tile grp id at all just compare with current
connector's tile_grp_id ?
>
> > +
> > + crtc_state = drm_atomic_get_crtc_state(&state->base,
> > conn_iter_state->crtc);
> > + if (IS_ERR(crtc_state)) {
> > + drm_connector_list_iter_end(&conn_list_iter);
> > + return PTR_ERR(conn_iter_state);
> > + }
> > + crtc_state->mode_changed = true;
> > + }
> > + drm_connector_list_iter_end(&conn_list_iter);
> > +
> > + return 0;
> > +}
> > +
> > +static int
> > +intel_dp_atomic_trans_port_sync_check(struct drm_i915_private *dev_priv,
>
> Pointless variable. Can be extracted from the atomic state.
>
> > + struct intel_atomic_state *state)
> > +{
> > + struct drm_connector *connector;
> > + struct drm_crtc_state *crtc_state;
> > + struct drm_connector_state *connector_state;
> > + int i, ret, tile_grp_id = 0;
>
> tile_grp_id is rather pointless. crtc_state and ret can move into
> tighter scope. And the next suggestion allows you to kill crtc_state
> entirely...
tile_grp_id is useless because I should just use it from current connector
obtained from state?
>
> > +
> > + if (INTEL_GEN(dev_priv) < 11)
> > + return 0;
> > +
> > + /* Is tiled, mark all other tiled CRTCs as needing a modeset */
> > + for_each_new_connector_in_state(&state->base, connector,
> > connector_state, i) {
> > + if (!connector->has_tile)
> > + continue;
> > + if (connector_state->crtc &&
> > + tile_grp_id != connector->tile_group->id) {
> > + crtc_state = drm_atomic_get_new_crtc_state(&state->base,
> > +
> > connector_state->crtc);
> > + if (!drm_atomic_crtc_needs_modeset(crtc_state))
> > + continue;
>
> This should to be able to be shortened to just
> intel_connector_needs_modeset().
Ok will use that instead.
>
> > +
> > + tile_grp_id = connector->tile_group->id;
> > + } else
> > + continue;
> > +
> > + ret = intel_dp_modeset_all_tiles(dev_priv, state, tile_grp_id);
> > + if (ret)
> > + return ret;
> > + }
> > +
> > + return 0;
> > +}
> > +
> > /**
> > * intel_atomic_check - validate state object
> > * @dev: drm device
> > @@ -14093,6 +14167,10 @@ static int intel_atomic_check(struct drm_device
> > *dev,
> > if (ret)
> > goto fail;
> >
> > + ret = intel_dp_atomic_trans_port_sync_check(dev_priv, state);
> > + if (ret)
> > + goto fail;
>
> We should probably do this from the connector .atomic_check() hook if
> Jose is going to do the MST thing that way. But no real problem doing
> here I think.
If you dont have a strong preference I will leave it here since Jose's code is
not in yet.
Manasi
>
> > +
> > for_each_oldnew_intel_crtc_in_state(state, crtc, old_crtc_state,
> > new_crtc_state, i) {
> > if (!needs_modeset(new_crtc_state)) {
> > --
> > 2.19.1
>
> --
> Ville Syrjälä
> Intel
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