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_dsb, bool, 0400, 58 "Enable display state buffer (DSB) (default: true)"); 59 60 intel_display_param_named_unsafe(enable_sagv, bool, 0400, 61 "Enable system agent voltage/frequency scaling (SAGV) (default: true)"); 62 63 intel_display_param_named_unsafe(disable_power_well, int, 0400, 64 "Disable display power wells when possible " 65 "(-1=auto [default], 0=power wells always on, 1=power wells disabled when possible)"); 66 67 intel_display_param_named_unsafe(enable_ips, bool, 0400, "Enable IPS (default: true)"); 68 69 intel_display_param_named_unsafe(invert_brightness, int, 0400, 70 "Invert backlight brightness " 71 "(-1 force normal, 0 machine defaults, 1 force inversion), please " 72 "report PCI device ID, subsystem vendor and subsystem device ID " 73 "to dri-devel@lists.freedesktop.org, if your machine needs it. " 74 "It will then be included in an upcoming module version."); 75 76 /* WA to get away with the default setting in VBT for early platforms.Will be removed */ 77 intel_display_param_named_unsafe(edp_vswing, int, 0400, 78 "Ignore/Override vswing pre-emph table selection from VBT " 79 "(0=use value from vbt [default], 1=low power swing(200mV)," 80 "2=default swing(400mV))"); 81 82 intel_display_param_named(enable_dpcd_backlight, int, 0400, 83 "Enable support for DPCD backlight control" 84 "(-1=use per-VBT LFP backlight type setting [default], 0=disabled, 1=enable, 2=force VESA interface, 3=force Intel interface)"); 85 86 intel_display_param_named_unsafe(load_detect_test, bool, 0400, 87 "Force-enable the VGA load detect code for testing (default:false). " 88 "For developers only."); 89 90 intel_display_param_named_unsafe(force_reset_modeset_test, bool, 0400, 91 "Force a modeset during gpu reset for testing (default:false). " 92 "For developers only."); 93 94 intel_display_param_named(disable_display, bool, 0400, 95 "Disable display (default: false)"); 96 97 intel_display_param_named(verbose_state_checks, bool, 0400, 98 "Enable verbose logs (ie. WARN_ON()) in case of unexpected hw state conditions."); 99 100 intel_display_param_named_unsafe(nuclear_pageflip, bool, 0400, 101 "Force enable atomic functionality on platforms that don't have full support yet."); 102 103 intel_display_param_named_unsafe(enable_dp_mst, bool, 0400, 104 "Enable multi-stream transport (MST) for new DisplayPort sinks. (default: true)"); 105 106 intel_display_param_named_unsafe(enable_fbc, int, 0400, 107 "Enable frame buffer compression for power savings " 108 "(default: -1 (use per-chip default))"); 109 110 intel_display_param_named_unsafe(enable_psr, int, 0400, 111 "Enable PSR " 112 "(0=disabled, 1=enable up to PSR1, 2=enable up to PSR2) " 113 "Default: -1 (use per-chip default)"); 114 115 intel_display_param_named(psr_safest_params, bool, 0400, 116 "Replace PSR VBT parameters by the safest and not optimal ones. This " 117 "is helpful to detect if PSR issues are related to bad values set in " 118 " VBT. (0=use VBT parameters, 1=use safest parameters)" 119 "Default: 0"); 120 121 intel_display_param_named_unsafe(enable_psr2_sel_fetch, bool, 0400, 122 "Enable PSR2 and Panel Replay selective fetch " 123 "(0=disabled, 1=enabled) " 124 "Default: 1"); 125 126 intel_display_param_named_unsafe(enable_dmc_wl, bool, 0400, 127 "Enable DMC wakelock " 128 "(0=disabled, 1=enabled) " 129 "Default: 0"); 130 131 __maybe_unused 132 static void _param_print_bool(struct drm_printer *p, const char *driver_name, 133 const char *name, bool val) 134 { 135 drm_printf(p, "%s.%s=%s\n", driver_name, name, str_yes_no(val)); 136 } 137 138 __maybe_unused 139 static void _param_print_int(struct drm_printer *p, const char *driver_name, 140 const char *name, int val) 141 { 142 drm_printf(p, "%s.%s=%d\n", driver_name, name, val); 143 } 144 145 __maybe_unused 146 static void _param_print_uint(struct drm_printer *p, const char *driver_name, 147 const char *name, unsigned int val) 148 { 149 drm_printf(p, "%s.%s=%u\n", driver_name, name, val); 150 } 151 152 __maybe_unused 153 static void _param_print_ulong(struct drm_printer *p, const char *driver_name, 154 const char *name, unsigned long val) 155 { 156 drm_printf(p, "%s.%s=%lu\n", driver_name, name, val); 157 } 158 159 __maybe_unused 160 static void _param_print_charp(struct drm_printer *p, const char *driver_name, 161 const char *name, const char *val) 162 { 163 drm_printf(p, "%s.%s=%s\n", driver_name, name, val); 164 } 165 166 #define _param_print(p, driver_name, name, val) \ 167 _Generic(val, \ 168 bool : _param_print_bool, \ 169 int : _param_print_int, \ 170 unsigned int : _param_print_uint, \ 171 unsigned long : _param_print_ulong, \ 172 char * : _param_print_charp)(p, driver_name, name, val) 173 174 /** 175 * intel_display_params_dump - dump intel display modparams 176 * @i915: i915 device 177 * @p: the &drm_printer 178 * 179 * Pretty printer for i915 modparams. 180 */ 181 void intel_display_params_dump(struct drm_i915_private *i915, struct drm_printer *p) 182 { 183 #define PRINT(T, x, ...) _param_print(p, i915->drm.driver->name, #x, i915->display.params.x); 184 INTEL_DISPLAY_PARAMS_FOR_EACH(PRINT); 185 #undef PRINT 186 } 187 188 __maybe_unused static void _param_dup_charp(char **valp) 189 { 190 *valp = kstrdup(*valp ? *valp : "", GFP_ATOMIC); 191 } 192 193 __maybe_unused static void _param_nop(void *valp) 194 { 195 } 196 197 #define _param_dup(valp) \ 198 _Generic(valp, \ 199 char ** : _param_dup_charp, \ 200 default : _param_nop) \ 201 (valp) 202 203 void intel_display_params_copy(struct intel_display_params *dest) 204 { 205 *dest = intel_display_modparams; 206 #define DUP(T, x, ...) _param_dup(&dest->x); 207 INTEL_DISPLAY_PARAMS_FOR_EACH(DUP); 208 #undef DUP 209 } 210 211 __maybe_unused static void _param_free_charp(char **valp) 212 { 213 kfree(*valp); 214 *valp = NULL; 215 } 216 217 #define _param_free(valp) \ 218 _Generic(valp, \ 219 char ** : _param_free_charp, \ 220 default : _param_nop) \ 221 (valp) 222 223 /* free the allocated members, *not* the passed in params itself */ 224 void intel_display_params_free(struct intel_display_params *params) 225 { 226 #define FREE(T, x, ...) _param_free(¶ms->x); 227 INTEL_DISPLAY_PARAMS_FOR_EACH(FREE); 228 #undef FREE 229 } 230