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