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  1// SPDX-License-Identifier: MIT
  2/*
  3 * Copyright © 2023 Intel Corporation
  4 */
  5
  6#include "intel_display_params.h"
  7#include "i915_drv.h"
  8
  9#define intel_display_param_named(name, T, perm, desc) \
 10	module_param_named(name, intel_display_modparams.name, T, perm); \
 11	MODULE_PARM_DESC(name, desc)
 12#define intel_display_param_named_unsafe(name, T, perm, desc) \
 13	module_param_named_unsafe(name, intel_display_modparams.name, T, perm); \
 14	MODULE_PARM_DESC(name, desc)
 15
 16static struct intel_display_params intel_display_modparams __read_mostly = {
 17#define MEMBER(T, member, value, ...) .member = (value),
 18	INTEL_DISPLAY_PARAMS_FOR_EACH(MEMBER)
 19#undef MEMBER
 20};
 21/*
 22 * Note: As a rule, keep module parameter sysfs permissions read-only
 23 * 0400. Runtime changes are only supported through i915 debugfs.
 24 *
 25 * For any exceptions requiring write access and runtime changes through module
 26 * parameter sysfs, prevent debugfs file creation by setting the parameter's
 27 * debugfs mode to 0.
 28 */
 29
 30intel_display_param_named_unsafe(dmc_firmware_path, charp, 0400,
 31	"DMC firmware path to use instead of the default one. "
 32	"Use /dev/null to disable DMC and runtime PM.");
 33
 34intel_display_param_named_unsafe(vbt_firmware, charp, 0400,
 35	"Load VBT from specified file under /lib/firmware");
 36
 37intel_display_param_named_unsafe(lvds_channel_mode, int, 0400,
 38	 "Specify LVDS channel mode "
 39	 "(0=probe BIOS [default], 1=single-channel, 2=dual-channel)");
 40
 41intel_display_param_named_unsafe(panel_use_ssc, int, 0400,
 42	"Use Spread Spectrum Clock with panels [LVDS/eDP] "
 43	"(default: auto from VBT)");
 44
 45intel_display_param_named_unsafe(vbt_sdvo_panel_type, int, 0400,
 46	"Override/Ignore selection of SDVO panel mode in the VBT "
 47	"(-2=ignore, -1=auto [default], index in VBT BIOS table)");
 48
 49intel_display_param_named_unsafe(enable_dc, int, 0400,
 50	"Enable power-saving display C-states. "
 51	"(-1=auto [default]; 0=disable; 1=up to DC5; 2=up to DC6; "
 52	"3=up to DC5 with DC3CO; 4=up to DC6 with DC3CO)");
 53
 54intel_display_param_named_unsafe(enable_dpt, bool, 0400,
 55	"Enable display page table (DPT) (default: true)");
 56
 57intel_display_param_named_unsafe(enable_dsb, bool, 0400,
 58	"Enable display state buffer (DSB) (default: true)");
 59
 60intel_display_param_named_unsafe(enable_sagv, bool, 0400,
 61	"Enable system agent voltage/frequency scaling (SAGV) (default: true)");
 62
 63intel_display_param_named_unsafe(disable_power_well, int, 0400,
 64	"Disable display power wells when possible "
 65	"(-1=auto [default], 0=power wells always on, 1=power wells disabled when possible)");
 66
 67intel_display_param_named_unsafe(enable_ips, bool, 0400, "Enable IPS (default: true)");
 68
 69intel_display_param_named_unsafe(invert_brightness, int, 0400,
 70	"Invert backlight brightness "
 71	"(-1 force normal, 0 machine defaults, 1 force inversion), please "
 72	"report PCI device ID, subsystem vendor and subsystem device ID "
 73	"to dri-devel@lists.freedesktop.org, if your machine needs it. "
 74	"It will then be included in an upcoming module version.");
 75
 76/* WA to get away with the default setting in VBT for early platforms.Will be removed */
 77intel_display_param_named_unsafe(edp_vswing, int, 0400,
 78	"Ignore/Override vswing pre-emph table selection from VBT "
 79	"(0=use value from vbt [default], 1=low power swing(200mV),"
 80	"2=default swing(400mV))");
 81
 82intel_display_param_named(enable_dpcd_backlight, int, 0400,
 83	"Enable support for DPCD backlight control"
 84	"(-1=use per-VBT LFP backlight type setting [default], 0=disabled, 1=enable, 2=force VESA interface, 3=force Intel interface)");
 85
 86intel_display_param_named_unsafe(load_detect_test, bool, 0400,
 87	"Force-enable the VGA load detect code for testing (default:false). "
 88	"For developers only.");
 89
 90intel_display_param_named_unsafe(force_reset_modeset_test, bool, 0400,
 91	"Force a modeset during gpu reset for testing (default:false). "
 92	"For developers only.");
 93
 94intel_display_param_named(disable_display, bool, 0400,
 95	"Disable display (default: false)");
 96
 97intel_display_param_named(verbose_state_checks, bool, 0400,
 98	"Enable verbose logs (ie. WARN_ON()) in case of unexpected hw state conditions.");
 99
100intel_display_param_named_unsafe(nuclear_pageflip, bool, 0400,
101	"Force enable atomic functionality on platforms that don't have full support yet.");
102
103intel_display_param_named_unsafe(enable_dp_mst, bool, 0400,
104	"Enable multi-stream transport (MST) for new DisplayPort sinks. (default: true)");
105
106intel_display_param_named_unsafe(enable_fbc, int, 0400,
107	"Enable frame buffer compression for power savings "
108	"(default: -1 (use per-chip default))");
109
110intel_display_param_named_unsafe(enable_psr, int, 0400,
111	"Enable PSR "
112	"(0=disabled, 1=enable up to PSR1, 2=enable up to PSR2) "
113	"Default: -1 (use per-chip default)");
114
115intel_display_param_named(psr_safest_params, bool, 0400,
116	"Replace PSR VBT parameters by the safest and not optimal ones. This "
117	"is helpful to detect if PSR issues are related to bad values set in "
118	" VBT. (0=use VBT parameters, 1=use safest parameters)"
119	"Default: 0");
120
121intel_display_param_named_unsafe(enable_psr2_sel_fetch, bool, 0400,
122	"Enable PSR2 and Panel Replay selective fetch "
123	"(0=disabled, 1=enabled) "
124	"Default: 1");
125
126intel_display_param_named_unsafe(enable_dmc_wl, bool, 0400,
127	"Enable DMC wakelock "
128	"(0=disabled, 1=enabled) "
129	"Default: 0");
130
131__maybe_unused
132static void _param_print_bool(struct drm_printer *p, const char *driver_name,
133			      const char *name, bool val)
134{
135	drm_printf(p, "%s.%s=%s\n", driver_name, name, str_yes_no(val));
136}
137
138__maybe_unused
139static void _param_print_int(struct drm_printer *p, const char *driver_name,
140			     const char *name, int val)
141{
142	drm_printf(p, "%s.%s=%d\n", driver_name, name, val);
143}
144
145__maybe_unused
146static void _param_print_uint(struct drm_printer *p, const char *driver_name,
147			      const char *name, unsigned int val)
148{
149	drm_printf(p, "%s.%s=%u\n", driver_name, name, val);
150}
151
152__maybe_unused
153static void _param_print_ulong(struct drm_printer *p, const char *driver_name,
154			       const char *name, unsigned long val)
155{
156	drm_printf(p, "%s.%s=%lu\n", driver_name, name, val);
157}
158
159__maybe_unused
160static void _param_print_charp(struct drm_printer *p, const char *driver_name,
161			       const char *name, const char *val)
162{
163	drm_printf(p, "%s.%s=%s\n", driver_name, name, val);
164}
165
166#define _param_print(p, driver_name, name, val)			\
167	_Generic(val,						\
168		 bool : _param_print_bool,			\
169		 int : _param_print_int,			\
170		 unsigned int : _param_print_uint,		\
171		 unsigned long : _param_print_ulong,		\
172		 char * : _param_print_charp)(p, driver_name, name, val)
173
174/**
175 * intel_display_params_dump - dump intel display modparams
176 * @params: display params
177 * @driver_name: driver name to use for printing
178 * @p: the &drm_printer
179 *
180 * Pretty printer for i915 modparams.
181 */
182void intel_display_params_dump(const struct intel_display_params *params,
183			       const char *driver_name, struct drm_printer *p)
184{
185#define PRINT(T, x, ...) _param_print(p, driver_name, #x, params->x);
186	INTEL_DISPLAY_PARAMS_FOR_EACH(PRINT);
187#undef PRINT
188}
189
190__maybe_unused static void _param_dup_charp(char **valp)
191{
192	*valp = kstrdup(*valp ? *valp : "", GFP_ATOMIC);
193}
194
195__maybe_unused static void _param_nop(void *valp)
196{
197}
198
199#define _param_dup(valp)				\
200	_Generic(valp,					\
201		 char ** : _param_dup_charp,		\
202		 default : _param_nop)			\
203		(valp)
204
205void intel_display_params_copy(struct intel_display_params *dest)
206{
207	*dest = intel_display_modparams;
208#define DUP(T, x, ...) _param_dup(&dest->x);
209	INTEL_DISPLAY_PARAMS_FOR_EACH(DUP);
210#undef DUP
211}
212
213__maybe_unused static void _param_free_charp(char **valp)
214{
215	kfree(*valp);
216	*valp = NULL;
217}
218
219#define _param_free(valp)				\
220	_Generic(valp,					\
221		 char ** : _param_free_charp,		\
222		 default : _param_nop)			\
223		(valp)
224
225/* free the allocated members, *not* the passed in params itself */
226void intel_display_params_free(struct intel_display_params *params)
227{
228#define FREE(T, x, ...) _param_free(&params->x);
229	INTEL_DISPLAY_PARAMS_FOR_EACH(FREE);
230#undef FREE
231}