1 // SPDX-License-Identifier: MIT 2 /* 3 * Copyright © 2023 Intel Corporation 4 */ 5 6 #include "intel_display_params.h" 7 #include "i915_drv.h" 8 9 #define intel_display_param_named(name, T, perm, desc) \ 10 module_param_named(name, intel_display_modparams.name, T, perm); \ 11 MODULE_PARM_DESC(name, desc) 12 #define intel_display_param_named_unsafe(name, T, perm, desc) \ 13 module_param_named_unsafe(name, intel_display_modparams.name, T, perm); \ 14 MODULE_PARM_DESC(name, desc) 15 16 static struct intel_display_params intel_display_modparams __read_mostly = { 17 #define MEMBER(T, member, value, ...) .member = (value), 18 INTEL_DISPLAY_PARAMS_FOR_EACH(MEMBER) 19 #undef MEMBER 20 }; 21 /* 22 * Note: As a rule, keep module parameter sysfs permissions read-only 23 * 0400. Runtime changes are only supported through i915 debugfs. 24 * 25 * For any exceptions requiring write access and runtime changes through module 26 * parameter sysfs, prevent debugfs file creation by setting the parameter's 27 * debugfs mode to 0. 28 */ 29 30 intel_display_param_named_unsafe(dmc_firmware_path, charp, 0400, 31 "DMC firmware path to use instead of the default one. " 32 "Use /dev/null to disable DMC and runtime PM."); 33 34 intel_display_param_named_unsafe(vbt_firmware, charp, 0400, 35 "Load VBT from specified file under /lib/firmware"); 36 37 intel_display_param_named_unsafe(lvds_channel_mode, int, 0400, 38 "Specify LVDS channel mode " 39 "(0=probe BIOS [default], 1=single-channel, 2=dual-channel)"); 40 41 intel_display_param_named_unsafe(panel_use_ssc, int, 0400, 42 "Use Spread Spectrum Clock with panels [LVDS/eDP] " 43 "(default: auto from VBT)"); 44 45 intel_display_param_named_unsafe(vbt_sdvo_panel_type, int, 0400, 46 "Override/Ignore selection of SDVO panel mode in the VBT " 47 "(-2=ignore, -1=auto [default], index in VBT BIOS table)"); 48 49 intel_display_param_named_unsafe(enable_dc, int, 0400, 50 "Enable power-saving display C-states. " 51 "(-1=auto [default]; 0=disable; 1=up to DC5; 2=up to DC6; " 52 "3=up to DC5 with DC3CO; 4=up to DC6 with DC3CO)"); 53 54 intel_display_param_named_unsafe(enable_dpt, bool, 0400, 55 "Enable display page table (DPT) (default: true)"); 56 57 intel_display_param_named_unsafe(enable_sagv, bool, 0400, 58 "Enable system agent voltage/frequency scaling (SAGV) (default: true)"); 59 60 intel_display_param_named_unsafe(disable_power_well, int, 0400, 61 "Disable display power wells when possible " 62 "(-1=auto [default], 0=power wells always on, 1=power wells disabled when possible)"); 63 64 intel_display_param_named_unsafe(enable_ips, bool, 0400, "Enable IPS (default: true)"); 65 66 intel_display_param_named_unsafe(invert_brightness, int, 0400, 67 "Invert backlight brightness " 68 "(-1 force normal, 0 machine defaults, 1 force inversion), please " 69 "report PCI device ID, subsystem vendor and subsystem device ID " 70 "to dri-devel@lists.freedesktop.org, if your machine needs it. " 71 "It will then be included in an upcoming module version."); 72 73 /* WA to get away with the default setting in VBT for early platforms.Will be removed */ 74 intel_display_param_named_unsafe(edp_vswing, int, 0400, 75 "Ignore/Override vswing pre-emph table selection from VBT " 76 "(0=use value from vbt [default], 1=low power swing(200mV)," 77 "2=default swing(400mV))"); 78 79 intel_display_param_named(enable_dpcd_backlight, int, 0400, 80 "Enable support for DPCD backlight control" 81 "(-1=use per-VBT LFP backlight type setting [default], 0=disabled, 1=enable, 2=force VESA interface, 3=force Intel interface)"); 82 83 intel_display_param_named_unsafe(load_detect_test, bool, 0400, 84 "Force-enable the VGA load detect code for testing (default:false). " 85 "For developers only."); 86 87 intel_display_param_named_unsafe(force_reset_modeset_test, bool, 0400, 88 "Force a modeset during gpu reset for testing (default:false). " 89 "For developers only."); 90 91 intel_display_param_named(disable_display, bool, 0400, 92 "Disable display (default: false)"); 93 94 intel_display_param_named(verbose_state_checks, bool, 0400, 95 "Enable verbose logs (ie. WARN_ON()) in case of unexpected hw state conditions."); 96 97 intel_display_param_named_unsafe(nuclear_pageflip, bool, 0400, 98 "Force enable atomic functionality on platforms that don't have full support yet."); 99 100 intel_display_param_named_unsafe(enable_dp_mst, bool, 0400, 101 "Enable multi-stream transport (MST) for new DisplayPort sinks. (default: true)"); 102 103 intel_display_param_named_unsafe(enable_fbc, int, 0400, 104 "Enable frame buffer compression for power savings " 105 "(default: -1 (use per-chip default))"); 106 107 intel_display_param_named_unsafe(enable_psr, int, 0400, 108 "Enable PSR " 109 "(0=disabled, 1=enable up to PSR1, 2=enable up to PSR2) " 110 "Default: -1 (use per-chip default)"); 111 112 intel_display_param_named(psr_safest_params, bool, 0400, 113 "Replace PSR VBT parameters by the safest and not optimal ones. This " 114 "is helpful to detect if PSR issues are related to bad values set in " 115 " VBT. (0=use VBT parameters, 1=use safest parameters)" 116 "Default: 0"); 117 118 intel_display_param_named_unsafe(enable_psr2_sel_fetch, bool, 0400, 119 "Enable PSR2 selective fetch " 120 "(0=disabled, 1=enabled) " 121 "Default: 1"); 122 123 intel_display_param_named_unsafe(enable_dmc_wl, bool, 0400, 124 "Enable DMC wakelock " 125 "(0=disabled, 1=enabled) " 126 "Default: 0"); 127 128 __maybe_unused 129 static void _param_print_bool(struct drm_printer *p, const char *driver_name, 130 const char *name, bool val) 131 { 132 drm_printf(p, "%s.%s=%s\n", driver_name, name, str_yes_no(val)); 133 } 134 135 __maybe_unused 136 static void _param_print_int(struct drm_printer *p, const char *driver_name, 137 const char *name, int val) 138 { 139 drm_printf(p, "%s.%s=%d\n", driver_name, name, val); 140 } 141 142 __maybe_unused 143 static void _param_print_uint(struct drm_printer *p, const char *driver_name, 144 const char *name, unsigned int val) 145 { 146 drm_printf(p, "%s.%s=%u\n", driver_name, name, val); 147 } 148 149 __maybe_unused 150 static void _param_print_ulong(struct drm_printer *p, const char *driver_name, 151 const char *name, unsigned long val) 152 { 153 drm_printf(p, "%s.%s=%lu\n", driver_name, name, val); 154 } 155 156 __maybe_unused 157 static void _param_print_charp(struct drm_printer *p, const char *driver_name, 158 const char *name, const char *val) 159 { 160 drm_printf(p, "%s.%s=%s\n", driver_name, name, val); 161 } 162 163 #define _param_print(p, driver_name, name, val) \ 164 _Generic(val, \ 165 bool : _param_print_bool, \ 166 int : _param_print_int, \ 167 unsigned int : _param_print_uint, \ 168 unsigned long : _param_print_ulong, \ 169 char * : _param_print_charp)(p, driver_name, name, val) 170 171 /** 172 * intel_display_params_dump - dump intel display modparams 173 * @i915: i915 device 174 * @p: the &drm_printer 175 * 176 * Pretty printer for i915 modparams. 177 */ 178 void intel_display_params_dump(struct drm_i915_private *i915, struct drm_printer *p) 179 { 180 #define PRINT(T, x, ...) _param_print(p, i915->drm.driver->name, #x, i915->display.params.x); 181 INTEL_DISPLAY_PARAMS_FOR_EACH(PRINT); 182 #undef PRINT 183 } 184 185 __maybe_unused static void _param_dup_charp(char **valp) 186 { 187 *valp = kstrdup(*valp ? *valp : "", GFP_ATOMIC); 188 } 189 190 __maybe_unused static void _param_nop(void *valp) 191 { 192 } 193 194 #define _param_dup(valp) \ 195 _Generic(valp, \ 196 char ** : _param_dup_charp, \ 197 default : _param_nop) \ 198 (valp) 199 200 void intel_display_params_copy(struct intel_display_params *dest) 201 { 202 *dest = intel_display_modparams; 203 #define DUP(T, x, ...) _param_dup(&dest->x); 204 INTEL_DISPLAY_PARAMS_FOR_EACH(DUP); 205 #undef DUP 206 } 207 208 __maybe_unused static void _param_free_charp(char **valp) 209 { 210 kfree(*valp); 211 *valp = NULL; 212 } 213 214 #define _param_free(valp) \ 215 _Generic(valp, \ 216 char ** : _param_free_charp, \ 217 default : _param_nop) \ 218 (valp) 219 220 /* free the allocated members, *not* the passed in params itself */ 221 void intel_display_params_free(struct intel_display_params *params) 222 { 223 #define FREE(T, x, ...) _param_free(¶ms->x); 224 INTEL_DISPLAY_PARAMS_FOR_EACH(FREE); 225 #undef FREE 226 } 227