1 // SPDX-License-Identifier: GPL-2.0-or-later
3  *  osi.c - _OSI implementation
27 	bool enable;  member
30 static struct acpi_osi_config {
40 static struct acpi_osi_config osi_config;
41 static struct acpi_osi_entry
48 	 * Linux-Dell-Video is used by BIOS to disable RTD3 for NVidia graphics
55 	{"Linux-Dell-Video", true},
57 	 * Linux-Lenovo-NV-HDMI-Audio is used by BIOS to power on NVidia's HDMI
58 	 * audio device which is turned off for power-saving in Windows OS.
63 	{"Linux-Lenovo-NV-HDMI-Audio", true},
65 	 * Linux-HPI-Hybrid-Graphics is used by BIOS to enable dGPU to
70 	{"Linux-HPI-Hybrid-Graphics", true},
73 static u32 acpi_osi_handler(acpi_string interface, u32 supported)  in acpi_osi_handler()
96 	bool enable = true;  in acpi_osi_setup()  local
120 				osi->enable = false;  in acpi_osi_setup()
127 		enable = false;  in acpi_osi_setup()
132 		if (!strcmp(osi->string, str)) {  in acpi_osi_setup()
133 			osi->enable = enable;  in acpi_osi_setup()
135 		} else if (osi->string[0] == '\0') {  in acpi_osi_setup()
136 			osi->enable = enable;  in acpi_osi_setup()
137 			strncpy(osi->string, str, OSI_STRING_LENGTH_MAX);  in acpi_osi_setup()
143 static void __init __acpi_osi_setup_darwin(bool enable)  in __acpi_osi_setup_darwin()  argument
145 	osi_config.darwin_enable = !!enable;  in __acpi_osi_setup_darwin()
146 	if (enable) {  in __acpi_osi_setup_darwin()
155 static void __init acpi_osi_setup_darwin(bool enable)  in acpi_osi_setup_darwin()  argument
160 	__acpi_osi_setup_darwin(enable);  in acpi_osi_setup_darwin()
166  * From pre-history through Linux-2.6.22, Linux responded TRUE upon a BIOS
171  * ill-conceived and opening the door to an un-bounded number of BIOS
174  * For example, OSI(Linux) was used on resume to re-POST a video card on
177  * capability, Linux has no way to tell the BIOS to skip the time-consuming
178  * POST -- putting Linux at a permanent performance disadvantage. On
185  * Linux-2.6.23 onward we respond FALSE.
192 static void __init __acpi_osi_setup_linux(bool enable)  in __acpi_osi_setup_linux()  argument
194 	osi_config.linux_enable = !!enable;  in __acpi_osi_setup_linux()
195 	if (enable)  in __acpi_osi_setup_linux()
201 static void __init acpi_osi_setup_linux(bool enable)  in acpi_osi_setup_linux()  argument
206 	__acpi_osi_setup_linux(enable);  in acpi_osi_setup_linux()
214  * otherwise string is added to list, augmenting built-in strings
216 static void __init acpi_osi_setup_late(void)  in acpi_osi_setup_late()
234 		str = osi->string;  in acpi_osi_setup_late()
237 		if (osi->enable) {  in acpi_osi_setup_late()
249 static int __init osi_setup(char *str)  in osi_setup()
272 static void __init acpi_osi_dmi_darwin(void)  in acpi_osi_dmi_darwin()
279 static void __init acpi_osi_dmi_linux(bool enable,  in acpi_osi_dmi_linux()  argument
282 	pr_notice("DMI detected to setup _OSI(\"Linux\"): %s\n", d->ident);  in acpi_osi_dmi_linux()
284 	__acpi_osi_setup_linux(enable);  in acpi_osi_dmi_linux()
287 static int __init dmi_enable_osi_linux(const struct dmi_system_id *d)  in dmi_enable_osi_linux()
294 static int __init dmi_disable_osi_vista(const struct dmi_system_id *d)  in dmi_disable_osi_vista()
296 	pr_notice("DMI detected: %s\n", d->ident);  in dmi_disable_osi_vista()
304 static int __init dmi_disable_osi_win7(const struct dmi_system_id *d)  in dmi_disable_osi_win7()
306 	pr_notice("DMI detected: %s\n", d->ident);  in dmi_disable_osi_win7()
312 static int __init dmi_disable_osi_win8(const struct dmi_system_id *d)  in dmi_disable_osi_win8()
314 	pr_notice("DMI detected: %s\n", d->ident);  in dmi_disable_osi_win8()
326 static const struct dmi_system_id acpi_osi_dmi_table[] __initconst = {
348 		     DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star International"),
354 	.ident = "Sony VGN-NS10J_S",
357 		     DMI_MATCH(DMI_PRODUCT_NAME, "VGN-NS10J_S"),
362 	.ident = "Sony VGN-SR290J",
365 		     DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR290J"),
370 	.ident = "VGN-NS50B_L",
373 		     DMI_MATCH(DMI_PRODUCT_NAME, "VGN-NS50B_L"),
378 	.ident = "VGN-SR19XN",
381 		     DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR19XN"),
491 static __init void acpi_osi_dmi_blacklisted(void)  in acpi_osi_dmi_blacklisted()
495 	/* Enable _OSI("Darwin") for Apple platforms. */  in acpi_osi_dmi_blacklisted()