drm/client: Handle tiled displays better

When testing on my tiled display, initially the tiled display is
detected correctly:
[90376.523692] xe 0000:67:00.0: [drm:drm_client_firmware_config.isra.0 [drm]] fallback: Not all outputs enabled
[90376.523713] xe 0000:67:00.0: [drm:drm_client_firmware_config.isra.0 [drm]] Enabled: 0, detected: 2
...
[90376.523967] xe 0000:67:00.0: [drm:drm_client_modeset_probe [drm]] [CRTC:82:pipe A] desired mode 1920x2160 set (1920,0)
[90376.524020] xe 0000:67:00.0: [drm:drm_client_modeset_probe [drm]] [CRTC:134:pipe B] desired mode 1920x2160 set (0,0)

But then, when modes have been set:
[90379.729525] xe 0000:67:00.0: [drm:drm_client_firmware_config.isra.0 [drm]] [CONNECTOR:287:DP-4] on [CRTC:82:pipe A]: 1920x2160
[90379.729640] xe 0000:67:00.0: [drm:drm_client_firmware_config.isra.0 [drm]] [CONNECTOR:289:DP-5] on [CRTC:134:pipe B]: 1920x2160
...
[90379.730036] xe 0000:67:00.0: [drm:drm_client_modeset_probe [drm]] [CRTC:82:pipe A] desired mode 1920x2160 set (0,0)
[90379.730124] xe 0000:67:00.0: [drm:drm_client_modeset_probe [drm]] [CRTC:134:pipe B] desired mode 1920x2160 set (0,0)

Call drm_client_get_tile_offsets() in drm_client_firmware_config() as
well, to ensure that the offset is set correctly.

This has to be done as a separate pass, as the tile order may not be
equal to the drm connector order.

Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20250116142825.3933-2-dev@lankhorst.se
Signed-off-by: Maarten Lankhorst <dev@lankhorst.se>
Cc: <stable@vger.kernel.org>

Author: Maarten Lankhorst

drivers/gpu/drm/drm_client_modeset.c

@@ -743,6 +743,15 @@ static bool drm_client_firmware_config(struct drm_client_dev *client,
 	if ((conn_configured & mask) != mask && conn_configured != conn_seq)
 		goto retry;
 
+	for (i = 0; i < count; i++) {
+		struct drm_connector *connector = connectors[i];
+
+		if (connector->has_tile)
+			drm_client_get_tile_offsets(dev, connectors, connector_count,
+						    modes, offsets, i,
+						    connector->tile_h_loc, connector->tile_v_loc);
+	}
+
 	/*
 	 * 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