1 /*- 2 * Copyright (c) 2022 Beckhoff Automation GmbH & Co. KG 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23 * SUCH DAMAGE. 24 * 25 */ 26 27 #include <sys/param.h> 28 #include <sys/systm.h> 29 30 #include <video/cmdline.h> 31 32 const char * 33 video_get_options(const char *connector_name) 34 { 35 char tunable[64]; 36 const char *options; 37 38 /* 39 * A user may use loader tunables to set a specific mode for the 40 * console. Tunables are read in the following order: 41 * 1. kern.vt.fb.modes.$connector_name 42 * 2. kern.vt.fb.default_mode 43 * 44 * Example of a mode specific to the LVDS connector: 45 * kern.vt.fb.modes.LVDS="1024x768" 46 * 47 * Example of a mode applied to all connectors not having a 48 * connector-specific mode: 49 * kern.vt.fb.default_mode="640x480" 50 */ 51 snprintf(tunable, sizeof(tunable), "kern.vt.fb.modes.%s", 52 connector_name); 53 if (bootverbose) { 54 printf("[drm] Connector %s: get mode from tunables:\n", connector_name); 55 printf("[drm] - %s\n", tunable); 56 printf("[drm] - kern.vt.fb.default_mode\n"); 57 } 58 options = kern_getenv(tunable); 59 if (options == NULL) 60 options = kern_getenv("kern.vt.fb.default_mode"); 61 62 return (options); 63 } 64