On Fri, Dec 20, 2019 at 08:41:12PM +0200, Ville Syrjälä wrote:
> On Thu, Dec 19, 2019 at 01:51:15PM -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.
> >
> > v2:
> > * Change crtc_state scope, remove tile_grp_id (Ville)
> > * Use intel_connector_needs_modeset() (Ville)
> > * Add modeset_synced_crtcs (Ville)
> > * Make sure synced crtcs are forced full modeset
> > after fastset check (Ville)
> >
> > Suggested-by: Ville Syrjälä <[email protected]>
> > Cc: Ville Syrjälä <[email protected]>
> > Cc: José Roberto de Souza <[email protected]>
> > Cc: Matt Roper <[email protected]>
> > Bugzilla: https://gitlab.freedesktop.org/drm/intel/issues/5
> > Signed-off-by: Manasi Navare <[email protected]>
> > ---
> > drivers/gpu/drm/i915/display/intel_display.c | 143 +++++++++++++++++--
> > 1 file changed, 131 insertions(+), 12 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/i915/display/intel_display.c
> > b/drivers/gpu/drm/i915/display/intel_display.c
> > index a3f9430493ae..00608d8cef50 100644
> > --- a/drivers/gpu/drm/i915/display/intel_display.c
> > +++ b/drivers/gpu/drm/i915/display/intel_display.c
> > @@ -13910,18 +13910,6 @@ static void intel_crtc_check_fastset(const struct
> > intel_crtc_state *old_crtc_sta
> > new_crtc_state->uapi.mode_changed = false;
> > new_crtc_state->update_pipe = true;
> >
> > - /*
> > - * If we're not doing the full modeset we want to
> > - * keep the current M/N values as they may be
> > - * sufficiently different to the computed values
> > - * to cause problems.
> > - *
> > - * FIXME: should really copy more fuzzy state here
> > - */
> > - new_crtc_state->fdi_m_n = old_crtc_state->fdi_m_n;
> > - new_crtc_state->dp_m_n = old_crtc_state->dp_m_n;
> > - new_crtc_state->dp_m2_n2 = old_crtc_state->dp_m2_n2;
> > - new_crtc_state->has_drrs = old_crtc_state->has_drrs;
> > }
> >
> > static int intel_crtc_add_planes_to_state(struct intel_atomic_state *state,
> > @@ -14032,6 +14020,105 @@ static int intel_atomic_check_crtcs(struct
> > intel_atomic_state *state)
> > return 0;
> > }
> >
> > +static void
> > +intel_dp_modeset_synced_crtcs(struct intel_atomic_state *state)
> > +{
> > + struct intel_crtc_state *new_crtc_state;
> > + struct intel_crtc *crtc;
> > + int i;
> > +
> > + for_each_new_intel_crtc_in_state(state, crtc,
> > + new_crtc_state, i) {
> > + if (is_trans_port_sync_mode(new_crtc_state)) {
> > + new_crtc_state->uapi.mode_changed = true;
> > + new_crtc_state->update_pipe = false;
> > + }
>
> Upon further thinking this is not quite right even for the post fastset
> check part. You're not checking at all whether these crtcs here are
> actually synced to the crtc that still had its needs_modeset() flagged.
> So this can end up forcing a modeset on an entirely unrelated crtc. We
> don't want that.
>
> You could fix that by passing in a transcoder bitmask, and then only
> flagging a modeset on crtcs whose cpu_transcoder matches the bitmask.
> (see intel_modeset_transcoders() in my branch).
>
> > + }
> > +}
> > +
> > +static void
> > +intel_dp_atomic_check_synced_crtcs(struct intel_atomic_state *state)
> > +{
> > + struct intel_crtc_state *new_crtc_state;
> > + struct intel_crtc *crtc;
> > + int i;
> > +
> > + for_each_new_intel_crtc_in_state(state, crtc,
> > + new_crtc_state, i) {
> > + if (!is_trans_port_sync_mode(new_crtc_state) ||
> > + !needs_modeset(new_crtc_state))
> > + continue;
> > +
> > + intel_dp_modeset_synced_crtcs(state);
I guess in this call I can add master trans and sync_mode_slaves_bitmask
And then if the crtcs in state are in sync mode and their cpu_trans matches the
master trans
or transcoders in the slave mask, add them to the modeset?
> > + }
> > +}
> > +
> > +static int
> > +intel_dp_modeset_all_tiles(struct intel_atomic_state *state, int
> > tile_grp_id)
> > +{
> > + struct drm_i915_private *dev_priv = to_i915(state->base.dev);
> > + struct drm_connector *connector;
> > + struct drm_connector_list_iter conn_list_iter;
> > +
> > + drm_connector_list_iter_begin(&dev_priv->drm, &conn_list_iter);
> > + drm_for_each_connector_iter(connector, &conn_list_iter) {
> > + struct drm_connector_state *conn_iter_state;
> > + struct drm_crtc_state *crtc_state;
> > +
> > + if (!(connector->has_tile &&
> > + connector->tile_group->id == tile_grp_id))
> > + continue;
> > + conn_iter_state = drm_atomic_get_connector_state(&state->base,
> > + connector);
> > + 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;
> > +
> > + 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_check_tiled_conns(struct intel_atomic_state *state)
> > +{
> > + struct drm_i915_private *dev_priv = to_i915(state->base.dev);
> > + struct drm_connector *connector;
> > + struct drm_connector_state *old_conn_state, *new_conn_state;
> > + int i, ret;
> > +
> > + if (INTEL_GEN(dev_priv) < 11)
> > + return 0;
> > +
> > + /* Is tiled, mark all other tiled CRTCs as needing a modeset */
> > + for_each_oldnew_connector_in_state(&state->base, connector,
> > + old_conn_state, new_conn_state, i) {
> > + if (!connector->has_tile)
> > + continue;
> > + if (!intel_connector_needs_modeset(state, old_conn_state,
> > + new_conn_state))
> > + continue;
> > +
> > + ret = intel_dp_modeset_all_tiles(state,
> > connector->tile_group->id);
> > + if (ret)
> > + return ret;
> > + }
> > +
> > + return 0;
> > +}
> > +
> > /**
> > * intel_atomic_check - validate state object
> > * @dev: drm device
> > @@ -14059,6 +14146,12 @@ static int intel_atomic_check(struct drm_device
> > *dev,
> > if (ret)
> > goto fail;
> >
> > + ret = intel_dp_atomic_check_tiled_conns(state);
> > + if (ret)
> > + goto fail;
>
> Since this is not sufficient for the pre-compute_config() check I think
> we should drop this part for now. It's a somewhat unlikely scenario
> after all so we can do it as a followup.
>
Well we do need this for handling the hotplug cases correctly so that the
connector disconnected
are added to the modeset which is working well with this function.
Manasi
> > +
> > + intel_dp_atomic_check_synced_crtcs(state);
> > +
> > for_each_oldnew_intel_crtc_in_state(state, crtc, old_crtc_state,
> > new_crtc_state, i) {
> > if (!needs_modeset(new_crtc_state)) {
> > @@ -14089,6 +14182,32 @@ static int intel_atomic_check(struct drm_device
> > *dev,
> > any_ms = true;
> > }
> >
> > + /*
> > + * In case of port synced crtcs, if one of the synced crtcs
> > + * needs a full modeset, all other synced crtcs should be
> > + * forced a full modeset.
> > + */
> > + intel_dp_atomic_check_synced_crtcs(state);
> > +
> > + for_each_oldnew_intel_crtc_in_state(state, crtc, old_crtc_state,
> > + new_crtc_state, i) {
> > + if (needs_modeset(new_crtc_state))
> > + continue;
> > +
> > + /*
> > + * If we're not doing the full modeset we want to
> > + * keep the current M/N values as they may be
> > + * sufficiently different to the computed values
> > + * to cause problems.
> > + *
> > + * FIXME: should really copy more fuzzy state here
> > + */
> > + new_crtc_state->fdi_m_n = old_crtc_state->fdi_m_n;
> > + new_crtc_state->dp_m_n = old_crtc_state->dp_m_n;
> > + new_crtc_state->dp_m2_n2 = old_crtc_state->dp_m2_n2;
> > + new_crtc_state->has_drrs = old_crtc_state->has_drrs;
> > + }
> > +
> > if (any_ms && !check_digital_port_conflicts(state)) {
> > DRM_DEBUG_KMS("rejecting conflicting digital port
> > configuration\n");
> > ret = EINVAL;
> > --
> > 2.19.1
>
> --
> Ville Syrjälä
> Intel
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