2 * Copyright © 2014 Intel Corporation
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16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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27 struct i915_params i915 __read_mostly = {
29 .panel_ignore_lid = 1,
33 .lvds_channel_mode = 0,
35 .vbt_sdvo_panel_type = -1,
38 .enable_execlists = 0,
39 .enable_hangcheck = true,
42 .preliminary_hw_support = IS_ENABLED(CONFIG_DRM_I915_PRELIMINARY_HW_SUPPORT),
43 .disable_power_well = 1,
46 .prefault_disable = 0,
48 .invert_brightness = 0,
50 .enable_cmd_parser = 0,
56 module_param_named(modeset, i915.modeset, int, 0400);
57 TUNABLE_INT("drm.i915.modeset", &i915.modeset);
58 MODULE_PARM_DESC(modeset,
59 "Use kernel modesetting [KMS] (0=DRM_I915_KMS from .config, "
60 "1=on, -1=force vga console preference [default])");
62 module_param_named(panel_ignore_lid, i915.panel_ignore_lid, int, 0600);
63 TUNABLE_INT("drm.i915.panel_ignore_lid", &i915.panel_ignore_lid);
64 MODULE_PARM_DESC(panel_ignore_lid,
65 "Override lid status (0=autodetect, 1=autodetect disabled [default], "
66 "-1=force lid closed, -2=force lid open)");
68 module_param_named(powersave, i915.powersave, int, 0600);
69 TUNABLE_INT("drm.i915.powersave", &i915.powersave);
70 MODULE_PARM_DESC(powersave,
71 "Enable powersavings, fbc, downclocking, etc. (default: true)");
73 module_param_named_unsafe(semaphores, i915.semaphores, int, 0400);
74 TUNABLE_INT("drm.i915.semaphores", &i915.semaphores);
75 MODULE_PARM_DESC(semaphores,
76 "Use semaphores for inter-ring sync "
77 "(default: -1 (use per-chip defaults))");
79 module_param_named_unsafe(enable_rc6, i915.enable_rc6, int, 0400);
80 TUNABLE_INT("drm.i915.enable_rc6", &i915.enable_rc6);
81 MODULE_PARM_DESC(enable_rc6,
82 "Enable power-saving render C-state 6. "
83 "Different stages can be selected via bitmask values "
84 "(0 = disable; 1 = enable rc6; 2 = enable deep rc6; 4 = enable deepest rc6). "
85 "For example, 3 would enable rc6 and deep rc6, and 7 would enable everything. "
86 "default: -1 (use per-chip default)");
88 module_param_named_unsafe(enable_fbc, i915.enable_fbc, int, 0600);
89 TUNABLE_INT("drm.i915.enable_fbc", &i915.enable_fbc);
90 MODULE_PARM_DESC(enable_fbc,
91 "Enable frame buffer compression for power savings "
92 "(default: -1 (use per-chip default))");
94 module_param_named(lvds_downclock, i915.lvds_downclock, int, 0400);
95 TUNABLE_INT("drm.i915.lvds_downclock", &i915.lvds_downclock);
96 MODULE_PARM_DESC(lvds_downclock,
97 "Use panel (LVDS/eDP) downclocking for power savings "
100 module_param_named(lvds_channel_mode, i915.lvds_channel_mode, int, 0600);
101 TUNABLE_INT("drm.i915.lvds_channel_mode", &i915.lvds_channel_mode);
102 MODULE_PARM_DESC(lvds_channel_mode,
103 "Specify LVDS channel mode "
104 "(0=probe BIOS [default], 1=single-channel, 2=dual-channel)");
106 module_param_named(lvds_use_ssc, i915.panel_use_ssc, int, 0600);
107 TUNABLE_INT("drm.i915.panel_use_ssc", &i915.panel_use_ssc);
108 MODULE_PARM_DESC(lvds_use_ssc,
109 "Use Spread Spectrum Clock with panels [LVDS/eDP] "
110 "(default: auto from VBT)");
112 module_param_named(vbt_sdvo_panel_type, i915.vbt_sdvo_panel_type, int, 0600);
113 TUNABLE_INT("drm.i915.vbt_sdvo_panel_type", &i915.vbt_sdvo_panel_type);
114 MODULE_PARM_DESC(vbt_sdvo_panel_type,
115 "Override/Ignore selection of SDVO panel mode in the VBT "
116 "(-2=ignore, -1=auto [default], index in VBT BIOS table)");
118 module_param_named(reset, i915.reset, bool, 0600);
119 TUNABLE_INT("drm.i915.reset", &i915.reset);
120 MODULE_PARM_DESC(reset, "Attempt GPU resets (default: true)");
122 module_param_named(enable_hangcheck, i915.enable_hangcheck, bool, 0644);
123 MODULE_PARM_DESC(enable_hangcheck,
124 "Periodically check GPU activity for detecting hangs. "
125 "WARNING: Disabling this can cause system wide hangs. "
128 module_param_named_unsafe(enable_ppgtt, i915.enable_ppgtt, int, 0400);
129 TUNABLE_INT("drm.i915.enable_ppgtt", &i915.enable_ppgtt);
130 MODULE_PARM_DESC(enable_ppgtt,
131 "Override PPGTT usage. "
132 "(-1=auto [default], 0=disabled, 1=aliasing, 2=full)");
134 module_param_named(enable_execlists, i915.enable_execlists, int, 0400);
135 MODULE_PARM_DESC(enable_execlists,
136 "Override execlists usage. "
137 "(-1=auto, 0=disabled [default], 1=enabled)");
139 module_param_named(enable_psr, i915.enable_psr, int, 0600);
140 TUNABLE_INT("drm.i915.enable_psr", &i915.enable_psr);
141 MODULE_PARM_DESC(enable_psr, "Enable PSR (default: false)");
143 module_param_named(preliminary_hw_support, i915.preliminary_hw_support, int, 0600);
144 MODULE_PARM_DESC(preliminary_hw_support,
145 "Enable preliminary hardware support.");
147 module_param_named(disable_power_well, i915.disable_power_well, int, 0600);
148 MODULE_PARM_DESC(disable_power_well,
149 "Disable the power well when possible (default: true)");
151 module_param_named(enable_ips, i915.enable_ips, int, 0600);
152 MODULE_PARM_DESC(enable_ips, "Enable IPS (default: true)");
154 module_param_named(fastboot, i915.fastboot, bool, 0600);
155 MODULE_PARM_DESC(fastboot,
156 "Try to skip unnecessary mode sets at boot time (default: false)");
158 module_param_named(prefault_disable, i915.prefault_disable, bool, 0600);
159 MODULE_PARM_DESC(prefault_disable,
160 "Disable page prefaulting for pread/pwrite/reloc (default:false). "
161 "For developers only.");
163 module_param_named(invert_brightness, i915.invert_brightness, int, 0600);
164 TUNABLE_INT("drm.i915.panel_invert_brightness", &i915.invert_brightness);
165 MODULE_PARM_DESC(invert_brightness,
166 "Invert backlight brightness "
167 "(-1 force normal, 0 machine defaults, 1 force inversion), please "
168 "report PCI device ID, subsystem vendor and subsystem device ID "
169 "to dri-devel@lists.freedesktop.org, if your machine needs it. "
170 "It will then be included in an upcoming module version.");
172 module_param_named(disable_display, i915.disable_display, bool, 0600);
173 MODULE_PARM_DESC(disable_display, "Disable display (default: false)");
175 module_param_named(disable_vtd_wa, i915.disable_vtd_wa, bool, 0600);
176 MODULE_PARM_DESC(disable_vtd_wa, "Disable all VT-d workarounds (default: false)");
178 module_param_named(enable_cmd_parser, i915.enable_cmd_parser, int, 0600);
179 MODULE_PARM_DESC(enable_cmd_parser,
180 "Enable command parsing (1=enabled [default], 0=disabled)");
182 module_param_named(use_mmio_flip, i915.use_mmio_flip, int, 0600);
183 TUNABLE_INT("drm.i915.use_mmio_flip", &i915.use_mmio_flip);
184 MODULE_PARM_DESC(use_mmio_flip,
185 "use MMIO flips (-1=never, 0=driver discretion [default], 1=always)");
187 module_param_named(mmio_debug, i915.mmio_debug, bool, 0600);
188 MODULE_PARM_DESC(mmio_debug,
189 "Enable the MMIO debug code (default: false). This may negatively "
190 "affect performance.");