Re: [Intel-gfx] [PATCH 1/3] drm/i915/dp: Make sure all tiled connectors get added to the state with full modeset

[Manasi Navare <manasi.d.navare@intel.com>]

On Mon, Dec 16, 2019 at 11:37:38PM +0200, Ville Syrjälä wrote:
> On Mon, Dec 16, 2019 at 11:13:09AM -0800, Manasi Navare wrote:
> > On Mon, Dec 16, 2019 at 04:37:38PM +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.syrjala@linux.intel.com>
> > > > Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
> > > > Cc: José Roberto de Souza <jose.souza@intel.com>
> > > > Bugzilla: https://gitlab.freedesktop.org/drm/intel/issues/5
> > > > Signed-off-by: Manasi Navare <manasi.d.navare@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;
> > > > +	struct drm_connector_list_iter conn_list_iter;
> > > > +	struct drm_crtc_state *crtc_state;
> > > > +
> > > > +	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;
> > > > +
> > > > +		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;
> > > > +
> > > > +		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,
> > > > +				      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;
> > > > +
> > > > +	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;
> > > > +
> > > > +			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;
> > > > +}
> > > 
> > > BTW after some more pondering I don't think this alone is sufficient.
> > > The tile information may have already disppeared so I believe we also
> > > need to make sure we mark all currently synced crtcs as needing a
> > > modeset if any of them need a modeset. And I guess that's pretty much
> > > the same function we'll need to handle fastset correctly.
> > >
> > 
> > The crtcs in the current state get synced and master/slave assignments happen in icl_add_sync_mode_crtcs before compute_config call
> > So are you suggesting basically moving this function after the crtcs are synced and then just setting modeset
> > to true for all synced crtcs if one of them needs modeset?
> 
> I think it should look something like:
> 
> modeset_tiled_things();
> modeset_synced_things();

but modeset_synced_things() should be called after icl_add_sync_crtcs() which as per your review should be called
from within modeset_pipe_config just before compute_config() call.

> 
> for_each() {

This is the for_each_crtc loop in intel_atomic_check() right?

> 	modeset_pipes_config();

So have icl_add_sync_crtcs outside of modeset_pipe_config()?

> 	if (can_fastset()) {
> 		modeset=false;
> 		fastset=true;
> 	}
> }
> 
> modeset_synced_things();
> 
> for_each() {
> 	if (!modeset && fastset)
> 		copy_state();
> }
We already do this in the code right?

Manasi

> 
> > 
> > And why would the tile information be disappeared?  
> 
> It'll get updated whenever someone does a getconnector() or whatever.
> 
> Example:
> 1. sync pipe A and B, pipe A is master
> 2. swap pipe B display for something else
> 3. getconnector() -> tile info goes poof
> 4. do something on pipe A that needs a modeset
>    no tile info so we miss that pipe B also needs a modeset
> 
> -- 
> Ville Syrjälä
> Intel
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