Re: [Intel-gfx] [PATCH 3/6] drm/mst: cached EDID for logical ports

On Wed, Oct 22, 2014 at 12:32:04PM +1000, Dave Airlie wrote:

From: Dave Airlie airlied@redhat.com

Logical ports are never going to have EDID changes, they are used for the internal ports on MST monitors.

We cache the EDIDs from these to save time at MST probe.

Signed-off-by: Dave Airlie airlied@redhat.com

drivers/gpu/drm/drm_dp_mst_topology.c | 20 ++++++++++++++++++-- drivers/gpu/drm/i915/intel_dp_mst.c | 2 +- include/drm/drm_dp_mst_helper.h | 4 +++- 3 files changed, 22 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c index 50926db..ce1113c 100644 --- a/drivers/gpu/drm/drm_dp_mst_topology.c +++ b/drivers/gpu/drm/drm_dp_mst_topology.c @@ -858,6 +858,8 @@ static void drm_dp_destroy_port(struct kref *kref) struct drm_dp_mst_topology_mgr *mgr = port->mgr; if (!port->input) { port->vcpi.num_slots = 0;

• kfree(port->cached_edid);
  

  if (port->connector) (*port->mgr->cbs->destroy_connector)(mgr, port->connector); drm_dp_port_teardown_pdt(port, port->pdt);

@@ -1096,6 +1098,10 @@ static void drm_dp_add_port(struct drm_dp_mst_branch *mstb, char proppath[255]; build_mst_prop_path(port, mstb, proppath); port->connector = (*mstb->mgr->cbs->add_connector)(mstb->mgr, port, proppath);

• if (port->port_num >= 8) {
  

• 	port->cached_edid = drm_get_edid(port->connector, &port->aux.ddc);
  

• }
  

I'm confused about how this works ... the tile property gets added in the intel ->add_connector callback already, but that relies upon drm_get_edid having parsed the displayid stuff. What am I missing? -Daniel

}

/* put reference to this port */ @@ -2149,7 +2155,8 @@ EXPORT_SYMBOL(drm_dp_mst_hpd_irq);

• This returns the current connection state for a port. It validates the
• port pointer still exists so the caller doesn't require a reference

*/ -enum drm_connector_status drm_dp_mst_detect_port(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port) +enum drm_connector_status drm_dp_mst_detect_port(struct drm_connector *connector,

• 				 struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port)
  

{ enum drm_connector_status status = connector_status_disconnected;

@@ -2168,6 +2175,10 @@ enum drm_connector_status drm_dp_mst_detect_port(struct drm_dp_mst_topology_mgr

case DP_PEER_DEVICE_SST_SINK: status = connector_status_connected;

• /* for logical ports - cache the EDID */
  

• if (port->port_num >= 8 && !port->cached_edid) {
  

• 	port->cached_edid = drm_get_edid(connector, &port->aux.ddc);
  

• }
  

  break; case DP_PEER_DEVICE_DP_LEGACY_CONV: if (port->ldps)

@@ -2199,7 +2210,12 @@ struct edid *drm_dp_mst_get_edid(struct drm_connector *connector, struct drm_dp_ if (!port) return NULL;

• edid = drm_get_edid(connector, &port->aux.ddc);

• if (port->cached_edid)

• edid = drm_edid_duplicate(port->cached_edid);
  

• else

• edid = drm_get_edid(connector, &port->aux.ddc);
  

• drm_mode_connector_set_tile_property(connector); drm_dp_put_port(port); return edid;

} diff --git a/drivers/gpu/drm/i915/intel_dp_mst.c b/drivers/gpu/drm/i915/intel_dp_mst.c index d9a7a78..c66e73a 100644 --- a/drivers/gpu/drm/i915/intel_dp_mst.c +++ b/drivers/gpu/drm/i915/intel_dp_mst.c @@ -283,7 +283,7 @@ intel_mst_port_dp_detect(struct drm_connector *connector) struct intel_connector *intel_connector = to_intel_connector(connector); struct intel_dp *intel_dp = intel_connector->mst_port;

• return drm_dp_mst_detect_port(&intel_dp->mst_mgr, intel_connector->port);

• return drm_dp_mst_detect_port(connector, &intel_dp->mst_mgr, intel_connector->port);

}

static enum drm_connector_status diff --git a/include/drm/drm_dp_mst_helper.h b/include/drm/drm_dp_mst_helper.h index 338fc10..ee6fbad 100644 --- a/include/drm/drm_dp_mst_helper.h +++ b/include/drm/drm_dp_mst_helper.h @@ -92,6 +92,8 @@ struct drm_dp_mst_port { struct drm_dp_vcpi vcpi; struct drm_connector *connector; struct drm_dp_mst_topology_mgr *mgr;

• struct edid *cached_edid; /* for DP logical ports - make tiling work */

};

/** @@ -474,7 +476,7 @@ int drm_dp_mst_topology_mgr_set_mst(struct drm_dp_mst_topology_mgr *mgr, bool ms int drm_dp_mst_hpd_irq(struct drm_dp_mst_topology_mgr *mgr, u8 *esi, bool *handled);

-enum drm_connector_status drm_dp_mst_detect_port(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port); +enum drm_connector_status drm_dp_mst_detect_port(struct drm_connector *connector, struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port);

struct edid *drm_dp_mst_get_edid(struct drm_connector *connector, struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port);

-- 2.1.0

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