Merge pull request #286 from versusvoid/update-connector-crtc-bindings

Update Connector-CRTC bindings after resume in DRM backend

2 files changed, 65 insertions, 28 deletions

diff --git a/backend/drm/backend.c b/backend/drm/backend.c
index 9fbfe58c..40b559e2 100644
--- a/backend/drm/backend.c
+++ b/backend/drm/backend.c
@@ -62,10 +62,13 @@ static void session_signal(struct wl_listener *listener, void *data) {
 
 	if (session->active) {
 		wlr_log(L_INFO, "DRM fd resumed");
+		wlr_drm_scan_connectors(drm);
 
 		struct wlr_drm_connector *conn;
 		wl_list_for_each(conn, &drm->outputs, link){
-			wlr_drm_connector_start_renderer(conn);
+			if (conn->output.current_mode) {
+				wlr_output_set_mode(&conn->output, conn->output.current_mode);
+			}
 
 			if (!conn->crtc) {
 				continue;
diff --git a/backend/drm/drm.c b/backend/drm/drm.c
index d0bdfcd5..441ba24e 100644
--- a/backend/drm/drm.c
+++ b/backend/drm/drm.c
@@ -259,7 +259,8 @@ static void wlr_drm_connector_enable(struct wlr_output *output, bool enable) {
 	}
 }
 
-static void realloc_planes(struct wlr_drm_backend *drm, const uint32_t *crtc_in) {
+static void realloc_planes(struct wlr_drm_backend *drm, const uint32_t *crtc_in,
+		bool *changed_outputs) {
 	// overlay, primary, cursor
 	for (int type = 0; type < 3; ++type) {
 		if (drm->num_type_planes[type] == 0) {
@@ -298,6 +299,7 @@ static void realloc_planes(struct wlr_drm_backend *drm, const uint32_t *crtc_in)
 			struct wlr_drm_plane *new = &drm->type_planes[type][crtc_res[i]];
 
 			if (*old != new) {
+				changed_outputs[crtc_res[i]] = true;
 				if (*old) {
 					wlr_drm_surface_finish(&(*old)->surf);
 				}
@@ -308,10 +310,12 @@ static void realloc_planes(struct wlr_drm_backend *drm, const uint32_t *crtc_in)
 	}
 }
 
-static void realloc_crtcs(struct wlr_drm_backend *drm, struct wlr_drm_connector *conn) {
+static void realloc_crtcs(struct wlr_drm_backend *drm,
+		struct wlr_drm_connector *conn, bool *changed_outputs) {
 	uint32_t crtc[drm->num_crtcs];
 	uint32_t crtc_res[drm->num_crtcs];
-	uint32_t possible_crtc[wl_list_length(&drm->outputs)];
+	ssize_t num_outputs = wl_list_length(&drm->outputs);
+	uint32_t possible_crtc[num_outputs];
 
 	for (size_t i = 0; i < drm->num_crtcs; ++i) {
 		crtc[i] = UNMATCHED;
@@ -327,41 +331,50 @@ static void realloc_crtcs(struct wlr_drm_backend *drm, struct wlr_drm_connector
 			index = i;
 		}
 
-		if (c->state != WLR_DRM_CONN_CONNECTED) {
-			continue;
+		if (c->crtc) {
+			crtc[c->crtc - drm->crtcs] = i;
+		}
+
+		if (c->state == WLR_DRM_CONN_CONNECTED) {
+			possible_crtc[i] = c->possible_crtc;
 		}
 
-		possible_crtc[i] = c->possible_crtc;
-		crtc[c->crtc - drm->crtcs] = i;
 	}
 	assert(index != -1);
 
 	possible_crtc[index] = conn->possible_crtc;
-	match_obj(wl_list_length(&drm->outputs), possible_crtc, drm->num_crtcs,
-		crtc, crtc_res);
+	match_obj(wl_list_length(&drm->outputs), possible_crtc,
+		drm->num_crtcs, crtc, crtc_res);
 
-	bool matched = false;
+	bool matched[num_outputs];
+	memset(matched, false, sizeof(matched));
 	for (size_t i = 0; i < drm->num_crtcs; ++i) {
-		// We don't want any of the current monitors to be deactivated.
-		if (crtc[i] != UNMATCHED && crtc_res[i] == UNMATCHED) {
-			return;
-		}
-		if (crtc_res[i] == index) {
-			matched = true;
+		if (crtc_res[i] != UNMATCHED) {
+			matched[crtc_res[i]] = true;
 		}
 	}
 
 	// There is no point doing anything if this monitor doesn't get activated
-	if (!matched) {
+	if (!matched[index]) {
 		return;
 	}
 
 	for (size_t i = 0; i < drm->num_crtcs; ++i) {
+		// We don't want any of the current monitors to be deactivated.
+		if (crtc[i] != UNMATCHED && !matched[crtc[i]]) {
+			return;
+		}
+	}
+
+	changed_outputs[index] = true;
+
+	for (size_t i = 0; i < drm->num_crtcs; ++i) {
 		if (crtc_res[i] == UNMATCHED) {
 			continue;
 		}
 
 		if (crtc_res[i] != crtc[i]) {
+			changed_outputs[crtc_res[i]] = true;
 			struct wlr_drm_connector *c;
 			size_t pos = 0;
 			wl_list_for_each(c, &drm->outputs, link) {
@@ -374,7 +387,7 @@ static void realloc_crtcs(struct wlr_drm_backend *drm, struct wlr_drm_connector
 		}
 	}
 
-	realloc_planes(drm, crtc_res);
+	realloc_planes(drm, crtc_res, changed_outputs);
 }
 
 static uint32_t get_possible_crtcs(int fd, uint32_t conn_id) {
@@ -413,6 +426,7 @@ static bool wlr_drm_connector_set_mode(struct wlr_output *output,
 		struct wlr_output_mode *mode) {
 	struct wlr_drm_connector *conn = (struct wlr_drm_connector *)output;
 	struct wlr_drm_backend *drm = (struct wlr_drm_backend *)output->backend;
+	bool changed_outputs[wl_list_length(&drm->outputs)];
 
 	wlr_log(L_INFO, "Modesetting '%s' with '%ux%u@%u mHz'", conn->output.name,
 			mode->width, mode->height, mode->refresh);
@@ -422,7 +436,8 @@ static bool wlr_drm_connector_set_mode(struct wlr_output *output,
 		goto error_conn;
 	}
 
-	realloc_crtcs(drm, conn);
+	memset(changed_outputs, false, sizeof(changed_outputs));
+	realloc_crtcs(drm, conn, changed_outputs);
 
 	if (!conn->crtc) {
 		wlr_log(L_ERROR, "Unable to match %s with a CRTC", conn->output.name);
@@ -437,18 +452,23 @@ static bool wlr_drm_connector_set_mode(struct wlr_output *output,
 		crtc->cursor ? crtc->cursor - drm->cursor_planes : -1);
 
 	conn->state = WLR_DRM_CONN_CONNECTED;
-	conn->output.width = mode->width;
-	conn->output.height = mode->height;
 	conn->output.current_mode = mode;
-	wl_signal_emit(&conn->output.events.resolution, &conn->output);
+	if (conn->output.width != mode->width || conn->output.height != mode->height) {
+		conn->output.width = mode->width;
+		conn->output.height = mode->height;
+		wl_signal_emit(&conn->output.events.resolution, &conn->output);
+	}
 
 	// Since realloc_crtcs can deallocate planes on OTHER outputs,
-	// we actually need to reinitalise all of them
+	// we actually need to reinitalise any than has changed
+	ssize_t output_index = -1;
 	wl_list_for_each(conn, &drm->outputs, link) {
+		output_index += 1;
 		struct wlr_output_mode *mode = conn->output.current_mode;
 		struct wlr_drm_crtc *crtc = conn->crtc;
 
-		if (conn->state != WLR_DRM_CONN_CONNECTED) {
+		if (conn->state != WLR_DRM_CONN_CONNECTED ||
+				!changed_outputs[output_index]) {
 			continue;
 		}
 
@@ -698,6 +718,9 @@ void wlr_drm_scan_connectors(struct wlr_drm_backend *drm) {
 			wlr_log_errno(L_ERROR, "Failed to get DRM connector");
 			continue;
 		}
+		drmModeEncoder *curr_enc = drmModeGetEncoder(drm->fd,
+			drm_conn->encoder_id);
+
 		int index = -1;
 		struct wlr_drm_connector *c, *wlr_conn = NULL;
 		wl_list_for_each(c, &drm->outputs, link) {
@@ -707,10 +730,12 @@ void wlr_drm_scan_connectors(struct wlr_drm_backend *drm) {
 				break;
 			}
 		}
+
 		if (!wlr_conn) {
 			wlr_conn = calloc(1, sizeof(*wlr_conn));
 			if (!wlr_conn) {
 				wlr_log_errno(L_ERROR, "Allocation failed");
+				drmModeFreeEncoder(curr_enc);
 				drmModeFreeConnector(drm_conn);
 				continue;
 			}
@@ -724,11 +749,8 @@ void wlr_drm_scan_connectors(struct wlr_drm_backend *drm) {
 			wlr_conn->state = WLR_DRM_CONN_DISCONNECTED;
 			wlr_conn->id = drm_conn->connector_id;
 
-			drmModeEncoder *curr_enc = drmModeGetEncoder(drm->fd,
-					drm_conn->encoder_id);
 			if (curr_enc) {
 				wlr_conn->old_crtc = drmModeGetCrtc(drm->fd, curr_enc->crtc_id);
-				drmModeFreeEncoder(curr_enc);
 			}
 
 			wlr_conn->output.phys_width = drm_conn->mmWidth;
@@ -753,6 +775,17 @@ void wlr_drm_scan_connectors(struct wlr_drm_backend *drm) {
 			seen[index] = true;
 		}
 
+		if (curr_enc) {
+			for (size_t i = 0; i < drm->num_crtcs; ++i) {
+				if (drm->crtcs[i].id == curr_enc->crtc_id) {
+					wlr_conn->crtc = &drm->crtcs[i];
+					break;
+				}
+			}
+		} else {
+			wlr_conn->crtc = NULL;
+		}
+
 		if (wlr_conn->state == WLR_DRM_CONN_DISCONNECTED &&
 				drm_conn->connection == DRM_MODE_CONNECTED) {
 			wlr_log(L_INFO, "'%s' connected", wlr_conn->output.name);
@@ -790,6 +823,7 @@ void wlr_drm_scan_connectors(struct wlr_drm_backend *drm) {
 			wlr_drm_connector_cleanup(wlr_conn);
 		}
 
+		drmModeFreeEncoder(curr_enc);
 		drmModeFreeConnector(drm_conn);
 	}