path: root/drivers/gpu/drm/i915/i915_drv.c

/* i915_drv.c -- i830,i845,i855,i865,i915 driver -*- linux-c -*-
 */
/*
 *
 * Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
 * All Rights Reserved.
 *
 * 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 NON-INFRINGEMENT.
 * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS 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 <linux/device.h>
#include "drmP.h"
#include "drm.h"
#include "i915_drm.h"
#include "i915_drv.h"
#include "intel_drv.h"

#include <linux/console.h>
#include <linux/module.h>
#include "drm_crtc_helper.h"

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)");

int i915_semaphores __read_mostly = -1;
module_param_named(semaphores, i915_semaphores, int, 0600);
MODULE_PARM_DESC(semaphores,
		"Use semaphores for inter-ring sync (default: -1 (use per-chip defaults))");

int i915_enable_rc6 __read_mostly = -1;
module_param_named(i915_enable_rc6, i915_enable_rc6, int, 0400);
MODULE_PARM_DESC(i915_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)");

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: -1 (use per-chip default))");

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)");

int i915_lvds_channel_mode __read_mostly;
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)");

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: auto from VBT)");

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/Ignore selection of SDVO panel mode in the VBT "
		"(-2=ignore, -1=auto [default], index in VBT BIOS table)");

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)");

int i915_enable_ppgtt __read_mostly = -1;
module_param_named(i915_enable_ppgtt,