drm/i915: provide module parameter description

static int i915_modeset __read_mostly = -1;

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])");

unsigned int i915_fbpercrtc __always_unused = 0;

module_param_named(fbpercrtc, i915_fbpercrtc, int, 0400);

int i915_panel_ignore_lid __read_mostly = 0;

module_param_named(panel_ignore_lid, i915_panel_ignore_lid, int, 0600);

MODULE_PARM_DESC(panel_ignore_lid,

		"Override lid status (0=autodetect [default], 1=lid open, "

		"-1=lid closed)");

unsigned int i915_powersave __read_mostly = 1;

module_param_named(powersave, i915_powersave, int, 0600);

MODULE_PARM_DESC(powersave,

		"Enable powersavings, fbc, downclocking, etc. (default: true)");

unsigned int i915_semaphores __read_mostly = 0;

module_param_named(semaphores, i915_semaphores, int, 0600);

MODULE_PARM_DESC(semaphores,

		"Use semaphores for inter-ring sync (default: false)");

unsigned int i915_enable_rc6 __read_mostly = 0;

module_param_named(i915_enable_rc6, i915_enable_rc6, int, 0600);

MODULE_PARM_DESC(i915_enable_rc6,

		"Enable power-saving render C-state 6 (default: true)");

unsigned int i915_enable_fbc __read_mostly = 1;

module_param_named(i915_enable_fbc, i915_enable_fbc, int, 0600);

MODULE_PARM_DESC(i915_enable_fbc,

		"Enable frame buffer compression for power savings "

		"(default: false)");

unsigned int i915_lvds_downclock __read_mostly = 0;

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)");

unsigned int i915_panel_use_ssc __read_mostly = 1;

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: true)");

int i915_vbt_sdvo_panel_type __read_mostly = -1;

module_param_named(vbt_sdvo_panel_type, i915_vbt_sdvo_panel_type, int, 0600);

MODULE_PARM_DESC(vbt_sdvo_panel_type,

		"Override selection of SDVO panel mode in the VBT "

		"(default: auto)");

static bool i915_try_reset __read_mostly = true;

module_param_named(reset, i915_try_reset, bool, 0600);

MODULE_PARM_DESC(reset, "Attempt GPU resets (default: true)");

bool i915_enable_hangcheck __read_mostly = 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)");

static struct drm_driver driver;

extern int intel_agp_enabled;