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1// SPDX-License-Identifier: MIT2/*3 * Copyright © 2023 Intel Corporation4 */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 16static 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 MEMBER20};21/*22 * Note: As a rule, keep module parameter sysfs permissions read-only23 * 0400. Runtime changes are only supported through i915 debugfs.24 *25 * For any exceptions requiring write access and runtime changes through module26 * parameter sysfs, prevent debugfs file creation by setting the parameter's27 * debugfs mode to 0.28 */29 30intel_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 34intel_display_param_named_unsafe(vbt_firmware, charp, 0400,35 "Load VBT from specified file under /lib/firmware");36 37intel_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 41intel_display_param_named_unsafe(panel_use_ssc, int, 0400,42 "Use Spread Spectrum Clock with panels [LVDS/eDP] "43 "(default: auto from VBT)");44 45intel_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 49intel_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 54intel_display_param_named_unsafe(enable_dpt, bool, 0400,55 "Enable display page table (DPT) (default: true)");56 57intel_display_param_named_unsafe(enable_dsb, bool, 0400,58 "Enable display state buffer (DSB) (default: true)");59 60intel_display_param_named_unsafe(enable_sagv, bool, 0400,61 "Enable system agent voltage/frequency scaling (SAGV) (default: true)");62 63intel_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 67intel_display_param_named_unsafe(enable_ips, bool, 0400, "Enable IPS (default: true)");68 69intel_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 */77intel_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 82intel_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 86intel_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 90intel_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 94intel_display_param_named(disable_display, bool, 0400,95 "Disable display (default: false)");96 97intel_display_param_named(verbose_state_checks, bool, 0400,98 "Enable verbose logs (ie. WARN_ON()) in case of unexpected hw state conditions.");99 100intel_display_param_named_unsafe(nuclear_pageflip, bool, 0400,101 "Force enable atomic functionality on platforms that don't have full support yet.");102 103intel_display_param_named_unsafe(enable_dp_mst, bool, 0400,104 "Enable multi-stream transport (MST) for new DisplayPort sinks. (default: true)");105 106intel_display_param_named_unsafe(enable_fbc, int, 0400,107 "Enable frame buffer compression for power savings "108 "(default: -1 (use per-chip default))");109 110intel_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 115intel_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 121intel_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 126intel_display_param_named_unsafe(enable_dmc_wl, bool, 0400,127 "Enable DMC wakelock "128 "(0=disabled, 1=enabled) "129 "Default: 0");130 131__maybe_unused132static 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_unused139static 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_unused146static 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_unused153static 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_unused160static 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 modparams176 * @display: display device177 * @p: the &drm_printer178 *179 * Pretty printer for i915 modparams.180 */181void intel_display_params_dump(struct intel_display *display, struct drm_printer *p)182{183#define PRINT(T, x, ...) _param_print(p, display->drm->driver->name, #x, display->params.x);184 INTEL_DISPLAY_PARAMS_FOR_EACH(PRINT);185#undef PRINT186}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 203void 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 DUP209}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 */224void 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 FREE229}230