drm/nouveau/disp: PIOR DP uses GPIO for HPD, not PMGR AUX interrupts

Fixes crash on boards with ANX9805 TMDS/DP encoders.

Cc: stable@vger.kernel.org # 6.4+
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Reviewed-by: Karol Herbst <kherbst@redhat.com>
Signed-off-by: Karol Herbst <kherbst@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230719044051.6975-2-skeggsb@gmail.com

Author: Ben Skeggs

drivers/gpu/drm/nouveau/nvkm/engine/disp/uconn.c

@@ -81,20 +81,29 @@ nvkm_uconn_uevent(struct nvkm_object *object, void *argv, u32 argc, struct nvkm_
 		return -ENOSYS;
 
 	list_for_each_entry(outp, &conn->disp->outps, head) {
-		if (outp->info.connector == conn->index && outp->dp.aux) {
-			if (args->v0.types & NVIF_CONN_EVENT_V0_PLUG  ) bits |= NVKM_I2C_PLUG;
-			if (args->v0.types & NVIF_CONN_EVENT_V0_UNPLUG) bits |= NVKM_I2C_UNPLUG;
-			if (args->v0.types & NVIF_CONN_EVENT_V0_IRQ   ) bits |= NVKM_I2C_IRQ;
+		if (outp->info.connector == conn->index)
+			break;
+	}
 
-			return nvkm_uevent_add(uevent, &device->i2c->event, outp->dp.aux->id, bits,
-					       nvkm_uconn_uevent_aux);
-		}
+	if (&outp->head == &conn->disp->outps)
+		return -EINVAL;
+
+	if (outp->dp.aux && !outp->info.location) {
+		if (args->v0.types & NVIF_CONN_EVENT_V0_PLUG  ) bits |= NVKM_I2C_PLUG;
+		if (args->v0.types & NVIF_CONN_EVENT_V0_UNPLUG) bits |= NVKM_I2C_UNPLUG;
+		if (args->v0.types & NVIF_CONN_EVENT_V0_IRQ   ) bits |= NVKM_I2C_IRQ;
+
+		return nvkm_uevent_add(uevent, &device->i2c->event, outp->dp.aux->id, bits,
+				       nvkm_uconn_uevent_aux);
 	}
 
 	if (args->v0.types & NVIF_CONN_EVENT_V0_PLUG  ) bits |= NVKM_GPIO_HI;
 	if (args->v0.types & NVIF_CONN_EVENT_V0_UNPLUG) bits |= NVKM_GPIO_LO;
-	if (args->v0.types & NVIF_CONN_EVENT_V0_IRQ)
-		return -EINVAL;
+	if (args->v0.types & NVIF_CONN_EVENT_V0_IRQ) {
+		/* TODO: support DP IRQ on ANX9805 and remove this hack. */
+		if (!outp->info.location)
+			return -EINVAL;
+	}
 
 	return nvkm_uevent_add(uevent, &device->gpio->event, conn->info.hpd, bits,
 			       nvkm_uconn_uevent_gpio);