text: /*
   * Copyright © 2014 Intel Corporation
   *
   * Permission is hereby granted, free of charge, to any person obtaining a
   * copy of this software and associated documentation files (the
   * "Software"), to deal in the Software without restriction, including
   * without limitation the rights to use, copy, modify, merge, publish,
   * distribute, sub license, and/or sell copies of the Software, and to
   * permit persons to whom the Software is furnished to do so, subject to
   * the following conditions:
   *
   * The above copyright notice and this permission notice (including the
   * next paragraph) shall be included in all copies or substantial portions
   * of the Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
   * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
   * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
   * IN THE SOFTWARE.
   */
  
  #include "i915_drv.h"
  
  struct i915_params i915 __read_mostly = {
  	.modeset = -1,
  	.panel_ignore_lid = 1,
  	.powersave = 1,
  	.semaphores = -1,
  	.lvds_downclock = 0,
  	.lvds_channel_mode = 0,
  	.panel_use_ssc = -1,
  	.vbt_sdvo_panel_type = -1,
  	.enable_rc6 = -1,
  	.enable_fbc = -1,
  	.enable_hangcheck = true,
  	.enable_ppgtt = -1,
  	.enable_psr = 0,
  	.preliminary_hw_support = IS_ENABLED(CONFIG_DRM_I915_PRELIMINARY_HW_SUPPORT),
  	.disable_power_well = 1,
  	.enable_ips = 1,
  	.fastboot = 0,
  	.prefault_disable = 0,
  	.reset = true,
  	.invert_brightness = 0,
  	.disable_display = 0,
  	.enable_cmd_parser = 0,
  };
  
  module_param_named(modeset, i915.modeset, int, 0400);
  MODULE_PARM_DESC(modeset,
  	"Use kernel modesetting [KMS] (0=DRM_I915_KMS from .config, "
  	"1=on, -1=force vga console preference [default])");
  
  module_param_named(panel_ignore_lid, i915.panel_ignore_lid, int, 0600);
  MODULE_PARM_DESC(panel_ignore_lid,
  	"Override lid status (0=autodetect, 1=autodetect disabled [default], "
  	"-1=force lid closed, -2=force lid open)");
  
  module_param_named(powersave, i915.powersave, int, 0600);
  MODULE_PARM_DESC(powersave,
  	"Enable powersavings, fbc, downclocking, etc. (default: true)");
  
  module_param_named(semaphores, i915.semaphores, int, 0400);
  MODULE_PARM_DESC(semaphores,
  	"Use semaphores for inter-ring sync "
  	"(default: -1 (use per-chip defaults))");
  
  module_param_named(enable_rc6, i915.enable_rc6, int, 0400);
  MODULE_PARM_DESC(enable_rc6,
  	"Enable power-saving render C-state 6. "
  	"Different stages can be selected via bitmask values "
  	"(0 = disable; 1 = enable rc6; 2 = enable deep rc6; 4 = enable deepest rc6). "
  	"For example, 3 would enable rc6 and deep rc6, and 7 would enable everything. "
  	"default: -1 (use per-chip default)");
  
  module_param_named(enable_fbc, i915.enable_fbc, int, 0600);
  MODULE_PARM_DESC(enable_fbc,
  	"Enable frame buffer compression for power savings "
  	"(default: -1 (use per-chip default))");
  
  module_param_named(lvds_downclock, i915.lvds_downclock, int, 0400);
  MODULE_PARM_DESC(lvds_downclock,
  	"Use panel (LVDS/eDP) downclocking for power savings "
  	"(default: false)");
  
  module_param_named(lvds_channel_mode, i915.lvds_channel_mode, int, 0600);
  MODULE_PARM_DESC(lvds_channel_mode,
  	 "Specify LVDS channel mode "
  	 "(0=probe BIOS [default], 1=single-channel, 2=dual-channel)");
  
  module_param_named(lvds_use_ssc, i915.panel_use_ssc, int, 0600);
  MODULE_PARM_DESC(lvds_use_ssc,
  	"Use Spread Spectrum Clock with panels [LVDS/eDP] "
  	"(default: auto from VBT)");
  
  module_param_named(vbt_sdvo_panel_type, i915.vbt_sdvo_panel_type, int, 0600);
  MODULE_PARM_DESC(vbt_sdvo_panel_type,
  	"Override/Ignore selection of SDVO panel mode in the VBT "
  	"(-2=ignore, -1=auto [default], index in VBT BIOS table)");
  
  module_param_named(reset, i915.reset, bool, 0600);
  MODULE_PARM_DESC(reset, "Attempt GPU resets (default: true)");
  
  module_param_named(enable_hangcheck, i915.enable_hangcheck, bool, 0644);
  MODULE_PARM_DESC(enable_hangcheck,
  	"Periodically check GPU activity for detecting hangs. "
  	"WARNING: Disabling this can cause system wide hangs. "
  	"(default: true)");
  
  module_param_named(enable_ppgtt, i915.enable_ppgtt, int, 0400);
  MODULE_PARM_DESC(enable_ppgtt,
  	"Override PPGTT usage. "
  	"(-1=auto [default], 0=disabled, 1=aliasing, 2=full)");
  
  module_param_named(enable_psr, i915.enable_psr, int, 0600);
  MODULE_PARM_DESC(enable_psr, "Enable PSR (default: false)");
  
  module_param_named(preliminary_hw_support, i915.preliminary_hw_support, int, 0600);
  MODULE_PARM_DESC(preliminary_hw_support,
  	"Enable preliminary hardware support.");
  
  module_param_named(disable_power_well, i915.disable_power_well, int, 0600);
  MODULE_PARM_DESC(disable_power_well,
  	"Disable the power well when possible (default: true)");
  
  module_param_named(enable_ips, i915.enable_ips, int, 0600);
  MODULE_PARM_DESC(enable_ips, "Enable IPS (default: true)");
  
  module_param_named(fastboot, i915.fastboot, bool, 0600);
  MODULE_PARM_DESC(fastboot,
  	"Try to skip unnecessary mode sets at boot time (default: false)");
  
  module_param_named(prefault_disable, i915.prefault_disable, bool, 0600);
  MODULE_PARM_DESC(prefault_disable,
  	"Disable page prefaulting for pread/pwrite/reloc (default:false). "
  	"For developers only.");
  
  module_param_named(invert_brightness, i915.invert_brightness, int, 0600);
  MODULE_PARM_DESC(invert_brightness,
  	"Invert backlight brightness "
  	"(-1 force normal, 0 machine defaults, 1 force inversion), please "
  	"report PCI device ID, subsystem vendor and subsystem device ID "
  	"to dri-devel@lists.freedesktop.org, if your machine needs it. "
  	"It will then be included in an upcoming module version.");
  
  module_param_named(disable_display, i915.disable_display, bool, 0600);
  MODULE_PARM_DESC(disable_display, "Disable display (default: false)");
  
  module_param_named(enable_cmd_parser, i915.enable_cmd_parser, int, 0600);
  MODULE_PARM_DESC(enable_cmd_parser,
  		 "Enable command parsing (1=enabled, 0=disabled [default])");
  