drm/fb-helper: Move out modeset config code

No functional changes, just moving code as-is and fixing includes.

Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
Reviewed-by: Maxime Ripard <maxime.ripard@bootlin.com>
Reviewed-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20190608152657.36613-4-noralf@tronnes.org

1 files changed, 701 insertions, 6 deletions

diff --git a/drivers/gpu/drm/drm_client_modeset.c b/drivers/gpu/drm/drm_client_modeset.c
index b1984f901a6d..006bf7390e7d 100644
--- a/drivers/gpu/drm/drm_client_modeset.c
+++ b/drivers/gpu/drm/drm_client_modeset.c
@@ -13,13 +13,22 @@
 
 #include <drm/drm_atomic.h>
 #include <drm/drm_client.h>
+#include <drm/drm_connector.h>
 #include <drm/drm_crtc.h>
 #include <drm/drm_device.h>
 #include <drm/drm_drv.h>
+#include <drm/drm_encoder.h>
+#include <drm/drm_print.h>
 
 #include "drm_crtc_internal.h"
 #include "drm_internal.h"
 
+#define DRM_CLIENT_MAX_CLONED_CONNECTORS	8
+
+struct drm_client_offset {
+	int x, y;
+};
+
 int drm_client_modeset_create(struct drm_client_dev *client)
 {
 	struct drm_device *dev = client->dev;
@@ -58,7 +67,7 @@ err_free:
 	return -ENOMEM;
 }
 
-void drm_client_modeset_release(struct drm_client_dev *client)
+static void drm_client_modeset_release(struct drm_client_dev *client)
 {
 	struct drm_mode_set *modeset;
 	unsigned int i;
@@ -75,8 +84,6 @@ void drm_client_modeset_release(struct drm_client_dev *client)
 		modeset->num_connectors = 0;
 	}
 }
-/* TODO: Remove export when modeset code has been moved over */
-EXPORT_SYMBOL(drm_client_modeset_release);
 
 void drm_client_modeset_free(struct drm_client_dev *client)
 {
@@ -95,7 +102,8 @@ void drm_client_modeset_free(struct drm_client_dev *client)
 	kfree(client->modesets);
 }
 
-struct drm_mode_set *drm_client_find_modeset(struct drm_client_dev *client, struct drm_crtc *crtc)
+static struct drm_mode_set *
+drm_client_find_modeset(struct drm_client_dev *client, struct drm_crtc *crtc)
 {
 	struct drm_mode_set *modeset;
 
@@ -105,8 +113,695 @@ struct drm_mode_set *drm_client_find_modeset(struct drm_client_dev *client, stru
 
 	return NULL;
 }
-/* TODO: Remove export when modeset code has been moved over */
-EXPORT_SYMBOL(drm_client_find_modeset);
+
+static struct drm_display_mode *
+drm_connector_has_preferred_mode(struct drm_connector *connector, int width, int height)
+{
+	struct drm_display_mode *mode;
+
+	list_for_each_entry(mode, &connector->modes, head) {
+		if (mode->hdisplay > width ||
+		    mode->vdisplay > height)
+			continue;
+		if (mode->type & DRM_MODE_TYPE_PREFERRED)
+			return mode;
+	}
+	return NULL;
+}
+
+static struct drm_display_mode *
+drm_connector_pick_cmdline_mode(struct drm_connector *connector)
+{
+	struct drm_cmdline_mode *cmdline_mode;
+	struct drm_display_mode *mode;
+	bool prefer_non_interlace;
+
+	cmdline_mode = &connector->cmdline_mode;
+	if (cmdline_mode->specified == false)
+		return NULL;
+
+	/* attempt to find a matching mode in the list of modes
+	 *  we have gotten so far, if not add a CVT mode that conforms
+	 */
+	if (cmdline_mode->rb || cmdline_mode->margins)
+		goto create_mode;
+
+	prefer_non_interlace = !cmdline_mode->interlace;
+again:
+	list_for_each_entry(mode, &connector->modes, head) {
+		/* check width/height */
+		if (mode->hdisplay != cmdline_mode->xres ||
+		    mode->vdisplay != cmdline_mode->yres)
+			continue;
+
+		if (cmdline_mode->refresh_specified) {
+			if (mode->vrefresh != cmdline_mode->refresh)
+				continue;
+		}
+
+		if (cmdline_mode->interlace) {
+			if (!(mode->flags & DRM_MODE_FLAG_INTERLACE))
+				continue;
+		} else if (prefer_non_interlace) {
+			if (mode->flags & DRM_MODE_FLAG_INTERLACE)
+				continue;
+		}
+		return mode;
+	}
+
+	if (prefer_non_interlace) {
+		prefer_non_interlace = false;
+		goto again;
+	}
+
+create_mode:
+	mode = drm_mode_create_from_cmdline_mode(connector->dev, cmdline_mode);
+	list_add(&mode->head, &connector->modes);
+
+	return mode;
+}
+
+static bool drm_connector_enabled(struct drm_connector *connector, bool strict)
+{
+	bool enable;
+
+	if (connector->display_info.non_desktop)
+		return false;
+
+	if (strict)
+		enable = connector->status == connector_status_connected;
+	else
+		enable = connector->status != connector_status_disconnected;
+
+	return enable;
+}
+
+static void drm_client_connectors_enabled(struct drm_connector **connectors,
+					  unsigned int connector_count,
+					  bool *enabled)
+{
+	bool any_enabled = false;
+	struct drm_connector *connector;
+	int i = 0;
+
+	for (i = 0; i < connector_count; i++) {
+		connector = connectors[i];
+		enabled[i] = drm_connector_enabled(connector, true);
+		DRM_DEBUG_KMS("connector %d enabled? %s\n", connector->base.id,
+			      connector->display_info.non_desktop ? "non desktop" : enabled[i] ? "yes" : "no");
+
+		any_enabled |= enabled[i];
+	}
+
+	if (any_enabled)
+		return;
+
+	for (i = 0; i < connector_count; i++)
+		enabled[i] = drm_connector_enabled(connectors[i], false);
+}
+
+static bool drm_client_target_cloned(struct drm_device *dev,
+				     struct drm_connector **connectors,
+				     unsigned int connector_count,
+				     struct drm_display_mode **modes,
+				     struct drm_client_offset *offsets,
+				     bool *enabled, int width, int height)
+{
+	int count, i, j;
+	bool can_clone = false;
+	struct drm_display_mode *dmt_mode, *mode;
+
+	/* only contemplate cloning in the single crtc case */
+	if (dev->mode_config.num_crtc > 1)
+		return false;
+
+	count = 0;
+	for (i = 0; i < connector_count; i++) {
+		if (enabled[i])
+			count++;
+	}
+
+	/* only contemplate cloning if more than one connector is enabled */
+	if (count <= 1)
+		return false;
+
+	/* check the command line or if nothing common pick 1024x768 */
+	can_clone = true;
+	for (i = 0; i < connector_count; i++) {
+		if (!enabled[i])
+			continue;
+		modes[i] = drm_connector_pick_cmdline_mode(connectors[i]);
+		if (!modes[i]) {
+			can_clone = false;
+			break;
+		}
+		for (j = 0; j < i; j++) {
+			if (!enabled[j])
+				continue;
+			if (!drm_mode_match(modes[j], modes[i],
+					    DRM_MODE_MATCH_TIMINGS |
+					    DRM_MODE_MATCH_CLOCK |
+					    DRM_MODE_MATCH_FLAGS |
+					    DRM_MODE_MATCH_3D_FLAGS))
+				can_clone = false;
+		}
+	}
+
+	if (can_clone) {
+		DRM_DEBUG_KMS("can clone using command line\n");
+		return true;
+	}
+
+	/* try and find a 1024x768 mode on each connector */
+	can_clone = true;
+	dmt_mode = drm_mode_find_dmt(dev, 1024, 768, 60, false);
+
+	for (i = 0; i < connector_count; i++) {
+		if (!enabled[i])
+			continue;
+
+		list_for_each_entry(mode, &connectors[i]->modes, head) {
+			if (drm_mode_match(mode, dmt_mode,
+					   DRM_MODE_MATCH_TIMINGS |
+					   DRM_MODE_MATCH_CLOCK |
+					   DRM_MODE_MATCH_FLAGS |
+					   DRM_MODE_MATCH_3D_FLAGS))
+				modes[i] = mode;
+		}
+		if (!modes[i])
+			can_clone = false;
+	}
+
+	if (can_clone) {
+		DRM_DEBUG_KMS("can clone using 1024x768\n");
+		return true;
+	}
+	DRM_INFO("kms: can't enable cloning when we probably wanted to.\n");
+	return false;
+}
+
+static int drm_client_get_tile_offsets(struct drm_connector **connectors,
+				       unsigned int connector_count,
+				       struct drm_display_mode **modes,
+				       struct drm_client_offset *offsets,
+				       int idx,
+				       int h_idx, int v_idx)
+{
+	struct drm_connector *connector;
+	int i;
+	int hoffset = 0, voffset = 0;
+
+	for (i = 0; i < connector_count; i++) {
+		connector = connectors[i];
+		if (!connector->has_tile)
+			continue;
+
+		if (!modes[i] && (h_idx || v_idx)) {
+			DRM_DEBUG_KMS("no modes for connector tiled %d %d\n", i,
+				      connector->base.id);
+			continue;
+		}
+		if (connector->tile_h_loc < h_idx)
+			hoffset += modes[i]->hdisplay;
+
+		if (connector->tile_v_loc < v_idx)
+			voffset += modes[i]->vdisplay;
+	}
+	offsets[idx].x = hoffset;
+	offsets[idx].y = voffset;
+	DRM_DEBUG_KMS("returned %d %d for %d %d\n", hoffset, voffset, h_idx, v_idx);
+	return 0;
+}
+
+static bool drm_client_target_preferred(struct drm_connector **connectors,
+					unsigned int connector_count,
+					struct drm_display_mode **modes,
+					struct drm_client_offset *offsets,
+					bool *enabled, int width, int height)
+{
+	const u64 mask = BIT_ULL(connector_count) - 1;
+	struct drm_connector *connector;
+	u64 conn_configured = 0;
+	int tile_pass = 0;
+	int i;
+
+retry:
+	for (i = 0; i < connector_count; i++) {
+		connector = connectors[i];
+
+		if (conn_configured & BIT_ULL(i))
+			continue;
+
+		if (enabled[i] == false) {
+			conn_configured |= BIT_ULL(i);
+			continue;
+		}
+
+		/* first pass over all the untiled connectors */
+		if (tile_pass == 0 && connector->has_tile)
+			continue;
+
+		if (tile_pass == 1) {
+			if (connector->tile_h_loc != 0 ||
+			    connector->tile_v_loc != 0)
+				continue;
+
+		} else {
+			if (connector->tile_h_loc != tile_pass - 1 &&
+			    connector->tile_v_loc != tile_pass - 1)
+			/* if this tile_pass doesn't cover any of the tiles - keep going */
+				continue;
+
+			/*
+			 * find the tile offsets for this pass - need to find
+			 * all tiles left and above
+			 */
+			drm_client_get_tile_offsets(connectors, connector_count, modes, offsets, i,
+						    connector->tile_h_loc, connector->tile_v_loc);
+		}
+		DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n",
+			      connector->base.id);
+
+		/* got for command line mode first */
+		modes[i] = drm_connector_pick_cmdline_mode(connector);
+		if (!modes[i]) {
+			DRM_DEBUG_KMS("looking for preferred mode on connector %d %d\n",
+				      connector->base.id, connector->tile_group ? connector->tile_group->id : 0);
+			modes[i] = drm_connector_has_preferred_mode(connector, width, height);
+		}
+		/* No preferred modes, pick one off the list */
+		if (!modes[i] && !list_empty(&connector->modes)) {
+			list_for_each_entry(modes[i], &connector->modes, head)
+				break;
+		}
+		DRM_DEBUG_KMS("found mode %s\n", modes[i] ? modes[i]->name :
+			  "none");
+		conn_configured |= BIT_ULL(i);
+	}
+
+	if ((conn_configured & mask) != mask) {
+		tile_pass++;
+		goto retry;
+	}
+	return true;
+}
+
+static bool connector_has_possible_crtc(struct drm_connector *connector,
+					struct drm_crtc *crtc)
+{
+	struct drm_encoder *encoder;
+	int i;
+
+	drm_connector_for_each_possible_encoder(connector, encoder, i) {
+		if (encoder->possible_crtcs & drm_crtc_mask(crtc))
+			return true;
+	}
+
+	return false;
+}
+
+static int drm_client_pick_crtcs(struct drm_client_dev *client,
+				 struct drm_connector **connectors,
+				 unsigned int connector_count,
+				 struct drm_crtc **best_crtcs,
+				 struct drm_display_mode **modes,
+				 int n, int width, int height)
+{
+	struct drm_device *dev = client->dev;
+	struct drm_connector *connector;
+	int my_score, best_score, score;
+	struct drm_crtc **crtcs, *crtc;
+	struct drm_mode_set *modeset;
+	int o;
+
+	if (n == connector_count)
+		return 0;
+
+	connector = connectors[n];
+
+	best_crtcs[n] = NULL;
+	best_score = drm_client_pick_crtcs(client, connectors, connector_count,
+					   best_crtcs, modes, n + 1, width, height);
+	if (modes[n] == NULL)
+		return best_score;
+
+	crtcs = kcalloc(connector_count, sizeof(*crtcs), GFP_KERNEL);
+	if (!crtcs)
+		return best_score;
+
+	my_score = 1;
+	if (connector->status == connector_status_connected)
+		my_score++;
+	if (connector->cmdline_mode.specified)
+		my_score++;
+	if (drm_connector_has_preferred_mode(connector, width, height))
+		my_score++;
+
+	/*
+	 * select a crtc for this connector and then attempt to configure
+	 * remaining connectors
+	 */
+	drm_client_for_each_modeset(modeset, client) {
+		crtc = modeset->crtc;
+
+		if (!connector_has_possible_crtc(connector, crtc))
+			continue;
+
+		for (o = 0; o < n; o++)
+			if (best_crtcs[o] == crtc)
+				break;
+
+		if (o < n) {
+			/* ignore cloning unless only a single crtc */
+			if (dev->mode_config.num_crtc > 1)
+				continue;
+
+			if (!drm_mode_equal(modes[o], modes[n]))
+				continue;
+		}
+
+		crtcs[n] = crtc;
+		memcpy(crtcs, best_crtcs, n * sizeof(*crtcs));
+		score = my_score + drm_client_pick_crtcs(client, connectors, connector_count,
+							 crtcs, modes, n + 1, width, height);
+		if (score > best_score) {
+			best_score = score;
+			memcpy(best_crtcs, crtcs, connector_count * sizeof(*crtcs));
+		}
+	}
+
+	kfree(crtcs);
+	return best_score;
+}
+
+/* Try to read the BIOS display configuration and use it for the initial config */
+static bool drm_client_firmware_config(struct drm_client_dev *client,
+				       struct drm_connector **connectors,
+				       unsigned int connector_count,
+				       struct drm_crtc **crtcs,
+				       struct drm_display_mode **modes,
+				       struct drm_client_offset *offsets,
+				       bool *enabled, int width, int height)
+{
+	unsigned int count = min_t(unsigned int, connector_count, BITS_PER_LONG);
+	unsigned long conn_configured, conn_seq, mask;
+	struct drm_device *dev = client->dev;
+	int i, j;
+	bool *save_enabled;
+	bool fallback = true, ret = true;
+	int num_connectors_enabled = 0;
+	int num_connectors_detected = 0;
+	struct drm_modeset_acquire_ctx ctx;
+
+	if (!drm_drv_uses_atomic_modeset(dev))
+		return false;
+
+	save_enabled = kcalloc(count, sizeof(bool), GFP_KERNEL);
+	if (!save_enabled)
+		return false;
+
+	drm_modeset_acquire_init(&ctx, 0);
+
+	while (drm_modeset_lock_all_ctx(dev, &ctx) != 0)
+		drm_modeset_backoff(&ctx);
+
+	memcpy(save_enabled, enabled, count);
+	mask = GENMASK(count - 1, 0);
+	conn_configured = 0;
+retry:
+	conn_seq = conn_configured;
+	for (i = 0; i < count; i++) {
+		struct drm_connector *connector;
+		struct drm_encoder *encoder;
+		struct drm_crtc *new_crtc;
+
+		connector = connectors[i];
+
+		if (conn_configured & BIT(i))
+			continue;
+
+		if (conn_seq == 0 && !connector->has_tile)
+			continue;
+
+		if (connector->status == connector_status_connected)
+			num_connectors_detected++;
+
+		if (!enabled[i]) {
+			DRM_DEBUG_KMS("connector %s not enabled, skipping\n",
+				      connector->name);
+			conn_configured |= BIT(i);
+			continue;
+		}
+
+		if (connector->force == DRM_FORCE_OFF) {
+			DRM_DEBUG_KMS("connector %s is disabled by user, skipping\n",
+				      connector->name);
+			enabled[i] = false;
+			continue;
+		}
+
+		encoder = connector->state->best_encoder;
+		if (!encoder || WARN_ON(!connector->state->crtc)) {
+			if (connector->force > DRM_FORCE_OFF)
+				goto bail;
+
+			DRM_DEBUG_KMS("connector %s has no encoder or crtc, skipping\n",
+				      connector->name);
+			enabled[i] = false;
+			conn_configured |= BIT(i);
+			continue;
+		}
+
+		num_connectors_enabled++;
+
+		new_crtc = connector->state->crtc;
+
+		/*
+		 * Make sure we're not trying to drive multiple connectors
+		 * with a single CRTC, since our cloning support may not
+		 * match the BIOS.
+		 */
+		for (j = 0; j < count; j++) {
+			if (crtcs[j] == new_crtc) {
+				DRM_DEBUG_KMS("fallback: cloned configuration\n");
+				goto bail;
+			}
+		}
+
+		DRM_DEBUG_KMS("looking for cmdline mode on connector %s\n",
+			      connector->name);
+
+		/* go for command line mode first */
+		modes[i] = drm_connector_pick_cmdline_mode(connector);
+
+		/* try for preferred next */
+		if (!modes[i]) {
+			DRM_DEBUG_KMS("looking for preferred mode on connector %s %d\n",
+				      connector->name, connector->has_tile);
+			modes[i] = drm_connector_has_preferred_mode(connector, width, height);
+		}
+
+		/* No preferred mode marked by the EDID? Are there any modes? */
+		if (!modes[i] && !list_empty(&connector->modes)) {
+			DRM_DEBUG_KMS("using first mode listed on connector %s\n",
+				      connector->name);
+			modes[i] = list_first_entry(&connector->modes,
+						    struct drm_display_mode,
+						    head);
+		}
+
+		/* last resort: use current mode */
+		if (!modes[i]) {
+			/*
+			 * IMPORTANT: We want to use the adjusted mode (i.e.
+			 * after the panel fitter upscaling) as the initial
+			 * config, not the input mode, which is what crtc->mode
+			 * usually contains. But since our current
+			 * code puts a mode derived from the post-pfit timings
+			 * into crtc->mode this works out correctly.
+			 *
+			 * This is crtc->mode and not crtc->state->mode for the
+			 * fastboot check to work correctly.
+			 */
+			DRM_DEBUG_KMS("looking for current mode on connector %s\n",
+				      connector->name);
+			modes[i] = &connector->state->crtc->mode;
+		}
+		crtcs[i] = new_crtc;
+
+		DRM_DEBUG_KMS("connector %s on [CRTC:%d:%s]: %dx%d%s\n",
+			      connector->name,
+			      connector->state->crtc->base.id,
+			      connector->state->crtc->name,
+			      modes[i]->hdisplay, modes[i]->vdisplay,
+			      modes[i]->flags & DRM_MODE_FLAG_INTERLACE ? "i" : "");
+
+		fallback = false;
+		conn_configured |= BIT(i);
+	}
+
+	if ((conn_configured & mask) != mask && conn_configured != conn_seq)
+		goto retry;
+
+	/*
+	 * If the BIOS didn't enable everything it could, fall back to have the
+	 * same user experiencing of lighting up as much as possible like the
+	 * fbdev helper library.
+	 */
+	if (num_connectors_enabled != num_connectors_detected &&
+	    num_connectors_enabled < dev->mode_config.num_crtc) {
+		DRM_DEBUG_KMS("fallback: Not all outputs enabled\n");
+		DRM_DEBUG_KMS("Enabled: %i, detected: %i\n", num_connectors_enabled,
+			      num_connectors_detected);
+		fallback = true;
+	}
+
+	if (fallback) {
+bail:
+		DRM_DEBUG_KMS("Not using firmware configuration\n");
+		memcpy(enabled, save_enabled, count);
+		ret = false;
+	}
+
+	drm_modeset_drop_locks(&ctx);
+	drm_modeset_acquire_fini(&ctx);
+
+	kfree(save_enabled);
+	return ret;
+}
+
+/**
+ * drm_client_modeset_probe() - Probe for displays
+ * @client: DRM client
+ * @width: Maximum display mode width (optional)
+ * @height: Maximum display mode height (optional)
+ *
+ * This function sets up display pipelines for enabled connectors and stores the
+ * config in the client's modeset array.
+ *
+ * Returns:
+ * Zero on success or negative error code on failure.
+ */
+int drm_client_modeset_probe(struct drm_client_dev *client, unsigned int width, unsigned int height)
+{
+	struct drm_connector *connector, **connectors = NULL;
+	struct drm_connector_list_iter conn_iter;
+	struct drm_device *dev = client->dev;
+	unsigned int total_modes_count = 0;
+	struct drm_client_offset *offsets;
+	unsigned int connector_count = 0;
+	struct drm_display_mode **modes;
+	struct drm_crtc **crtcs;
+	int i, ret = 0;
+	bool *enabled;
+
+	DRM_DEBUG_KMS("\n");
+
+	if (!width)
+		width = dev->mode_config.max_width;
+	if (!height)
+		height = dev->mode_config.max_height;
+
+	drm_connector_list_iter_begin(dev, &conn_iter);
+	drm_client_for_each_connector_iter(connector, &conn_iter) {
+		struct drm_connector **tmp;
+
+		tmp = krealloc(connectors, (connector_count + 1) * sizeof(*connectors), GFP_KERNEL);
+		if (!tmp) {
+			ret = -ENOMEM;
+			goto free_connectors;
+		}
+
+		connectors = tmp;
+		drm_connector_get(connector);
+		connectors[connector_count++] = connector;
+	}
+	drm_connector_list_iter_end(&conn_iter);
+
+	if (!connector_count)
+		return 0;
+
+	crtcs = kcalloc(connector_count, sizeof(*crtcs), GFP_KERNEL);
+	modes = kcalloc(connector_count, sizeof(*modes), GFP_KERNEL);
+	offsets = kcalloc(connector_count, sizeof(*offsets), GFP_KERNEL);
+	enabled = kcalloc(connector_count, sizeof(bool), GFP_KERNEL);
+	if (!crtcs || !modes || !enabled || !offsets) {
+		DRM_ERROR("Memory allocation failed\n");
+		ret = -ENOMEM;
+		goto out;
+	}
+
+	mutex_lock(&client->modeset_mutex);
+
+	mutex_lock(&dev->mode_config.mutex);
+	for (i = 0; i < connector_count; i++)
+		total_modes_count += connectors[i]->funcs->fill_modes(connectors[i], width, height);
+	if (!total_modes_count)
+		DRM_DEBUG_KMS("No connectors reported connected with modes\n");
+	drm_client_connectors_enabled(connectors, connector_count, enabled);
+
+	if (!drm_client_firmware_config(client, connectors, connector_count, crtcs,
+					modes, offsets, enabled, width, height)) {
+		memset(modes, 0, connector_count * sizeof(*modes));
+		memset(crtcs, 0, connector_count * sizeof(*crtcs));
+		memset(offsets, 0, connector_count * sizeof(*offsets));
+
+		if (!drm_client_target_cloned(dev, connectors, connector_count, modes,
+					      offsets, enabled, width, height) &&
+		    !drm_client_target_preferred(connectors, connector_count, modes,
+						 offsets, enabled, width, height))
+			DRM_ERROR("Unable to find initial modes\n");
+
+		DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n",
+			      width, height);
+
+		drm_client_pick_crtcs(client, connectors, connector_count,
+				      crtcs, modes, 0, width, height);
+	}
+	mutex_unlock(&dev->mode_config.mutex);
+
+	drm_client_modeset_release(client);
+
+	for (i = 0; i < connector_count; i++) {
+		struct drm_display_mode *mode = modes[i];
+		struct drm_crtc *crtc = crtcs[i];
+		struct drm_client_offset *offset = &offsets[i];
+
+		if (mode && crtc) {
+			struct drm_mode_set *modeset = drm_client_find_modeset(client, crtc);
+			struct drm_connector *connector = connectors[i];
+
+			DRM_DEBUG_KMS("desired mode %s set on crtc %d (%d,%d)\n",
+				      mode->name, crtc->base.id, offset->x, offset->y);
+
+			if (WARN_ON_ONCE(modeset->num_connectors == DRM_CLIENT_MAX_CLONED_CONNECTORS ||
+					 (dev->mode_config.num_crtc > 1 && modeset->num_connectors == 1))) {
+				ret = -EINVAL;
+				break;
+			}
+
+			modeset->mode = drm_mode_duplicate(dev, mode);
+			drm_connector_get(connector);
+			modeset->connectors[modeset->num_connectors++] = connector;
+			modeset->x = offset->x;
+			modeset->y = offset->y;
+		}
+	}
+
+	mutex_unlock(&client->modeset_mutex);
+out:
+	kfree(crtcs);
+	kfree(modes);
+	kfree(offsets);
+	kfree(enabled);
+free_connectors:
+	for (i = 0; i < connector_count; i++)
+		drm_connector_put(connectors[i]);
+	kfree(connectors);
+
+	return ret;
+}
+EXPORT_SYMBOL(drm_client_modeset_probe);
 
 /**
  * drm_client_panel_rotation() - Check panel orientation