drm/nouveau/kms: pass event mask to hpd handler

Will be moving the DP link status check / re-train here so it's safe
from racing with modeset routing changes.

MST message handling etc. will remain where it is.
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>

drivers/gpu/drm/nouveau/nouveau_connector.c

@@ -1162,14 +1162,15 @@ nouveau_connector_funcs_lvds = {
 };
 
 void
-nouveau_connector_hpd(struct drm_connector *connector)
+nouveau_connector_hpd(struct nouveau_connector *nv_connector, u64 bits)
 {
-	struct nouveau_drm *drm = nouveau_drm(connector->dev);
-	u32 mask = drm_connector_mask(connector);
+	struct nouveau_drm *drm = nouveau_drm(nv_connector->base.dev);
+	u32 mask = drm_connector_mask(&nv_connector->base);
 	unsigned long flags;
 
 	spin_lock_irqsave(&drm->hpd_lock, flags);
 	if (!(drm->hpd_pending & mask)) {
+		nv_connector->hpd_pending |= bits;
 		drm->hpd_pending |= mask;
 		schedule_work(&drm->hpd_work);
 	}
@@ -1185,15 +1186,13 @@ nouveau_connector_hotplug(struct nvif_notify *notify)
 	struct drm_device *dev = connector->dev;
 	struct nouveau_drm *drm = nouveau_drm(dev);
 	const struct nvif_notify_conn_rep_v0 *rep = notify->data;
-	bool plugged = (rep->mask != NVIF_NOTIFY_CONN_V0_UNPLUG);
 
 	if (rep->mask & NVIF_NOTIFY_CONN_V0_IRQ) {
 		nouveau_dp_irq(drm, nv_connector);
 		return NVIF_NOTIFY_KEEP;
 	}
 
-	NV_DEBUG(drm, "%splugged %s\n", plugged ? "" : "un", connector->name);
-	nouveau_connector_hpd(connector);
+	nouveau_connector_hpd(nv_connector, rep->mask);
 
 	return NVIF_NOTIFY_KEEP;
 }

drivers/gpu/drm/nouveau/nouveau_connector.h

@@ -124,6 +124,7 @@ struct nouveau_connector {
 	u8 *dcb;
 
 	struct nvif_conn conn;
+	u64 hpd_pending;
 	struct nvif_notify hpd;
 
 	struct drm_dp_aux aux;
@@ -198,7 +199,7 @@ nouveau_crtc_connector_get(struct nouveau_crtc *nv_crtc)
 
 struct drm_connector *
 nouveau_connector_create(struct drm_device *, const struct dcb_output *);
-void nouveau_connector_hpd(struct drm_connector *connector);
+void nouveau_connector_hpd(struct nouveau_connector *, u64 bits);
 
 extern int nouveau_tv_disable;
 extern int nouveau_ignorelid;

drivers/gpu/drm/nouveau/nouveau_display.c

@@ -488,14 +488,28 @@ nouveau_display_hpd_work(struct work_struct *work)
 	drm_connector_list_iter_begin(dev, &conn_iter);
 
 	nouveau_for_each_non_mst_connector_iter(connector, &conn_iter) {
+		struct nouveau_connector *nv_connector = nouveau_connector(connector);
 		enum drm_connector_status old_status = connector->status;
-		u64 old_epoch_counter = connector->epoch_counter;
+		u64 bits, old_epoch_counter = connector->epoch_counter;
 
 		if (!(pending & drm_connector_mask(connector)))
 			continue;
 
-		connector->status = drm_helper_probe_detect(connector, NULL,
-							    false);
+		spin_lock_irq(&drm->hpd_lock);
+		bits = nv_connector->hpd_pending;
+		nv_connector->hpd_pending = 0;
+		spin_unlock_irq(&drm->hpd_lock);
+
+		drm_dbg_kms(dev, "[CONNECTOR:%d:%s] plug:%d unplug:%d irq:%d\n",
+			    connector->base.id, connector->name,
+			    !!(bits & NVIF_NOTIFY_CONN_V0_PLUG),
+			    !!(bits & NVIF_NOTIFY_CONN_V0_UNPLUG),
+			    !!(bits & NVIF_NOTIFY_CONN_V0_IRQ));
+
+		if (bits & NVIF_NOTIFY_CONN_V0_IRQ)
+			continue;
+
+		connector->status = drm_helper_probe_detect(connector, NULL, false);
 		if (old_epoch_counter == connector->epoch_counter)
 			continue;
 

drivers/gpu/drm/nouveau/nouveau_dp.c

@@ -29,8 +29,7 @@
 #include "nouveau_encoder.h"
 #include "nouveau_crtc.h"
 
-#include <nvif/class.h>
-#include <nvif/cl5070.h>
+#include <nvif/event.h>
 
 MODULE_PARM_DESC(mst, "Enable DisplayPort multi-stream (default: enabled)");
 static int nouveau_mst = 1;
@@ -218,8 +217,8 @@ void nouveau_dp_irq(struct nouveau_drm *drm,
 	struct drm_connector *connector = &nv_connector->base;
 	struct nouveau_encoder *outp = find_encoder(connector, DCB_OUTPUT_DP);
 	struct nv50_mstm *mstm;
+	u64 hpd = 0;
 	int ret;
-	bool send_hpd = false;
 
 	if (!outp)
 		return;
@@ -231,14 +230,14 @@ void nouveau_dp_irq(struct nouveau_drm *drm,
 
 	if (mstm && mstm->is_mst) {
 		if (!nv50_mstm_service(drm, nv_connector, mstm))
-			send_hpd = true;
+			hpd |= NVIF_NOTIFY_CONN_V0_UNPLUG;
 	} else {
 		drm_dp_cec_irq(&nv_connector->aux);
 
 		if (nouveau_dp_has_sink_count(connector, outp)) {
 			ret = drm_dp_read_sink_count(&nv_connector->aux);
 			if (ret != outp->dp.sink_count)
-				send_hpd = true;
+				hpd |= NVIF_NOTIFY_CONN_V0_PLUG;
 			if (ret >= 0)
 				outp->dp.sink_count = ret;
 		}
@@ -246,8 +245,7 @@ void nouveau_dp_irq(struct nouveau_drm *drm,
 
 	mutex_unlock(&outp->dp.hpd_irq_lock);
 
-	if (send_hpd)
-		nouveau_connector_hpd(connector);
+	nouveau_connector_hpd(nv_connector, NVIF_NOTIFY_CONN_V0_IRQ | hpd);
 }
 
 /* TODO: