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 | |
16 | static 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 | |
30 | intel_display_param_named_unsafe(vbt_firmware, charp, 0400, |
31 | "Load VBT from specified file under /lib/firmware" ); |
32 | |
33 | intel_display_param_named_unsafe(lvds_channel_mode, int, 0400, |
34 | "Specify LVDS channel mode " |
35 | "(0=probe BIOS [default], 1=single-channel, 2=dual-channel)" ); |
36 | |
37 | intel_display_param_named_unsafe(panel_use_ssc, int, 0400, |
38 | "Use Spread Spectrum Clock with panels [LVDS/eDP] " |
39 | "(default: auto from VBT)" ); |
40 | |
41 | intel_display_param_named_unsafe(vbt_sdvo_panel_type, int, 0400, |
42 | "Override/Ignore selection of SDVO panel mode in the VBT " |
43 | "(-2=ignore, -1=auto [default], index in VBT BIOS table)" ); |
44 | |
45 | intel_display_param_named_unsafe(enable_dc, int, 0400, |
46 | "Enable power-saving display C-states. " |
47 | "(-1=auto [default]; 0=disable; 1=up to DC5; 2=up to DC6; " |
48 | "3=up to DC5 with DC3CO; 4=up to DC6 with DC3CO)" ); |
49 | |
50 | intel_display_param_named_unsafe(enable_dpt, bool, 0400, |
51 | "Enable display page table (DPT) (default: true)" ); |
52 | |
53 | intel_display_param_named_unsafe(enable_sagv, bool, 0400, |
54 | "Enable system agent voltage/frequency scaling (SAGV) (default: true)" ); |
55 | |
56 | intel_display_param_named_unsafe(disable_power_well, int, 0400, |
57 | "Disable display power wells when possible " |
58 | "(-1=auto [default], 0=power wells always on, 1=power wells disabled when possible)" ); |
59 | |
60 | intel_display_param_named_unsafe(enable_ips, bool, 0400, "Enable IPS (default: true)" ); |
61 | |
62 | intel_display_param_named_unsafe(invert_brightness, int, 0400, |
63 | "Invert backlight brightness " |
64 | "(-1 force normal, 0 machine defaults, 1 force inversion), please " |
65 | "report PCI device ID, subsystem vendor and subsystem device ID " |
66 | "to dri-devel@lists.freedesktop.org, if your machine needs it. " |
67 | "It will then be included in an upcoming module version." ); |
68 | |
69 | /* WA to get away with the default setting in VBT for early platforms.Will be removed */ |
70 | intel_display_param_named_unsafe(edp_vswing, int, 0400, |
71 | "Ignore/Override vswing pre-emph table selection from VBT " |
72 | "(0=use value from vbt [default], 1=low power swing(200mV)," |
73 | "2=default swing(400mV))" ); |
74 | |
75 | intel_display_param_named(enable_dpcd_backlight, int, 0400, |
76 | "Enable support for DPCD backlight control" |
77 | "(-1=use per-VBT LFP backlight type setting [default], 0=disabled, 1=enable, 2=force VESA interface, 3=force Intel interface)" ); |
78 | |
79 | intel_display_param_named_unsafe(load_detect_test, bool, 0400, |
80 | "Force-enable the VGA load detect code for testing (default:false). " |
81 | "For developers only." ); |
82 | |
83 | intel_display_param_named_unsafe(force_reset_modeset_test, bool, 0400, |
84 | "Force a modeset during gpu reset for testing (default:false). " |
85 | "For developers only." ); |
86 | |
87 | intel_display_param_named(disable_display, bool, 0400, |
88 | "Disable display (default: false)" ); |
89 | |
90 | intel_display_param_named(verbose_state_checks, bool, 0400, |
91 | "Enable verbose logs (ie. WARN_ON()) in case of unexpected hw state conditions." ); |
92 | |
93 | intel_display_param_named_unsafe(nuclear_pageflip, bool, 0400, |
94 | "Force enable atomic functionality on platforms that don't have full support yet." ); |
95 | |
96 | intel_display_param_named_unsafe(enable_dp_mst, bool, 0400, |
97 | "Enable multi-stream transport (MST) for new DisplayPort sinks. (default: true)" ); |
98 | |
99 | intel_display_param_named_unsafe(enable_fbc, int, 0400, |
100 | "Enable frame buffer compression for power savings " |
101 | "(default: -1 (use per-chip default))" ); |
102 | |
103 | intel_display_param_named_unsafe(enable_psr, int, 0400, |
104 | "Enable PSR " |
105 | "(0=disabled, 1=enable up to PSR1, 2=enable up to PSR2) " |
106 | "Default: -1 (use per-chip default)" ); |
107 | |
108 | intel_display_param_named(psr_safest_params, bool, 0400, |
109 | "Replace PSR VBT parameters by the safest and not optimal ones. This " |
110 | "is helpful to detect if PSR issues are related to bad values set in " |
111 | " VBT. (0=use VBT parameters, 1=use safest parameters)" |
112 | "Default: 0" ); |
113 | |
114 | intel_display_param_named_unsafe(enable_psr2_sel_fetch, bool, 0400, |
115 | "Enable PSR2 selective fetch " |
116 | "(0=disabled, 1=enabled) " |
117 | "Default: 1" ); |
118 | |
119 | __maybe_unused |
120 | static void _param_print_bool(struct drm_printer *p, const char *driver_name, |
121 | const char *name, bool val) |
122 | { |
123 | drm_printf(p, f: "%s.%s=%s\n" , driver_name, name, str_yes_no(v: val)); |
124 | } |
125 | |
126 | __maybe_unused |
127 | static void _param_print_int(struct drm_printer *p, const char *driver_name, |
128 | const char *name, int val) |
129 | { |
130 | drm_printf(p, f: "%s.%s=%d\n" , driver_name, name, val); |
131 | } |
132 | |
133 | __maybe_unused |
134 | static void _param_print_uint(struct drm_printer *p, const char *driver_name, |
135 | const char *name, unsigned int val) |
136 | { |
137 | drm_printf(p, f: "%s.%s=%u\n" , driver_name, name, val); |
138 | } |
139 | |
140 | __maybe_unused |
141 | static void _param_print_ulong(struct drm_printer *p, const char *driver_name, |
142 | const char *name, unsigned long val) |
143 | { |
144 | drm_printf(p, f: "%s.%s=%lu\n" , driver_name, name, val); |
145 | } |
146 | |
147 | __maybe_unused |
148 | static void _param_print_charp(struct drm_printer *p, const char *driver_name, |
149 | const char *name, const char *val) |
150 | { |
151 | drm_printf(p, f: "%s.%s=%s\n" , driver_name, name, val); |
152 | } |
153 | |
154 | #define _param_print(p, driver_name, name, val) \ |
155 | _Generic(val, \ |
156 | bool : _param_print_bool, \ |
157 | int : _param_print_int, \ |
158 | unsigned int : _param_print_uint, \ |
159 | unsigned long : _param_print_ulong, \ |
160 | char * : _param_print_charp)(p, driver_name, name, val) |
161 | |
162 | /** |
163 | * intel_display_params_dump - dump intel display modparams |
164 | * @i915: i915 device |
165 | * @p: the &drm_printer |
166 | * |
167 | * Pretty printer for i915 modparams. |
168 | */ |
169 | void intel_display_params_dump(struct drm_i915_private *i915, struct drm_printer *p) |
170 | { |
171 | #define PRINT(T, x, ...) _param_print(p, i915->drm.driver->name, #x, i915->display.params.x); |
172 | INTEL_DISPLAY_PARAMS_FOR_EACH(PRINT); |
173 | #undef PRINT |
174 | } |
175 | |
176 | __maybe_unused static void _param_dup_charp(char **valp) |
177 | { |
178 | *valp = kstrdup(s: *valp ? *valp : "" , GFP_ATOMIC); |
179 | } |
180 | |
181 | __maybe_unused static void _param_nop(void *valp) |
182 | { |
183 | } |
184 | |
185 | #define _param_dup(valp) \ |
186 | _Generic(valp, \ |
187 | char ** : _param_dup_charp, \ |
188 | default : _param_nop) \ |
189 | (valp) |
190 | |
191 | void intel_display_params_copy(struct intel_display_params *dest) |
192 | { |
193 | *dest = intel_display_modparams; |
194 | #define DUP(T, x, ...) _param_dup(&dest->x); |
195 | INTEL_DISPLAY_PARAMS_FOR_EACH(DUP); |
196 | #undef DUP |
197 | } |
198 | |
199 | __maybe_unused static void _param_free_charp(char **valp) |
200 | { |
201 | kfree(objp: *valp); |
202 | *valp = NULL; |
203 | } |
204 | |
205 | #define _param_free(valp) \ |
206 | _Generic(valp, \ |
207 | char ** : _param_free_charp, \ |
208 | default : _param_nop) \ |
209 | (valp) |
210 | |
211 | /* free the allocated members, *not* the passed in params itself */ |
212 | void intel_display_params_free(struct intel_display_params *params) |
213 | { |
214 | #define FREE(T, x, ...) _param_free(¶ms->x); |
215 | INTEL_DISPLAY_PARAMS_FOR_EACH(FREE); |
216 | #undef FREE |
217 | } |
218 | |