drivers/gpu/drm/i915/display/intel_display_params.c

Source file repositories/reference/linux-study-clean/drivers/gpu/drm/i915/display/intel_display_params.c

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/i915/display/intel_display_params.c
Extension
.c
Size
8349 bytes
Lines
243
Domain
Driver Families
Bucket
drivers/gpu
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: MIT
/*
 * Copyright © 2023 Intel Corporation
 */

#include <linux/moduleparam.h>
#include <linux/slab.h>
#include <linux/string_choices.h>

#include <drm/drm_print.h>

#include "intel_display_params.h"

#define intel_display_param_named(name, T, perm, desc) \
	module_param_named(name, intel_display_modparams.name, T, perm); \
	MODULE_PARM_DESC(name, desc)
#define intel_display_param_named_unsafe(name, T, perm, desc) \
	module_param_named_unsafe(name, intel_display_modparams.name, T, perm); \
	MODULE_PARM_DESC(name, desc)

static struct intel_display_params intel_display_modparams __read_mostly = {
#define MEMBER(T, member, value, ...) .member = (value),
	INTEL_DISPLAY_PARAMS_FOR_EACH(MEMBER)
#undef MEMBER
};
/*
 * Note: As a rule, keep module parameter sysfs permissions read-only
 * 0400. Runtime changes are only supported through i915 debugfs.
 *
 * For any exceptions requiring write access and runtime changes through module
 * parameter sysfs, prevent debugfs file creation by setting the parameter's
 * debugfs mode to 0.
 */

intel_display_param_named_unsafe(dmc_firmware_path, charp, 0400,
	"DMC firmware path to use instead of the default one. "
	"Use /dev/null to disable DMC and runtime PM.");

intel_display_param_named_unsafe(vbt_firmware, charp, 0400,
	"Load VBT from specified file under /lib/firmware");

intel_display_param_named_unsafe(lvds_channel_mode, int, 0400,
	 "Specify LVDS channel mode "
	 "(0=probe BIOS [default], 1=single-channel, 2=dual-channel)");

intel_display_param_named_unsafe(panel_use_ssc, int, 0400,
	"Use Spread Spectrum Clock with panels [LVDS/eDP] "
	"(default: auto from VBT)");

intel_display_param_named_unsafe(vbt_sdvo_panel_type, int, 0400,
	"Override/Ignore selection of SDVO panel mode in the VBT "
	"(-2=ignore, -1=auto [default], index in VBT BIOS table)");

intel_display_param_named_unsafe(enable_dc, int, 0400,
	"Enable power-saving display C-states. "
	"(-1=auto [default]; 0=disable; 1=up to DC5; 2=up to DC6; "
	"3=up to DC5 with DC3CO; 4=up to DC6 with DC3CO)");

intel_display_param_named_unsafe(enable_dpt, bool, 0400,
	"Enable display page table (DPT) (default: true)");

intel_display_param_named_unsafe(enable_dsb, bool, 0400,
	"Enable display state buffer (DSB) (default: true)");

intel_display_param_named_unsafe(enable_flipq, bool, 0400,
	"Enable DMC flip queue (default: false)");

intel_display_param_named_unsafe(enable_sagv, bool, 0400,
	"Enable system agent voltage/frequency scaling (SAGV) (default: true)");

intel_display_param_named_unsafe(disable_power_well, int, 0400,
	"Disable display power wells when possible "
	"(-1=auto [default], 0=power wells always on, 1=power wells disabled when possible)");

intel_display_param_named_unsafe(enable_ips, bool, 0400, "Enable IPS (default: true)");

intel_display_param_named_unsafe(invert_brightness, int, 0400,
	"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.");

/* WA to get away with the default setting in VBT for early platforms.Will be removed */
intel_display_param_named_unsafe(edp_vswing, int, 0400,
	"Ignore/Override vswing pre-emph table selection from VBT "
	"(0=use value from vbt [default], 1=low power swing(200mV),"
	"2=default swing(400mV))");

intel_display_param_named(enable_dpcd_backlight, int, 0400,

Annotation

Implementation Notes