Commit e10cfdc3 authored by Chen Yu's avatar Chen Yu Committed by Rafael J. Wysocki
Browse files

ACPI / osi: Fix default _OSI(Darwin) support 

The following commit always reports positive value when Apple hardware
queries _OSI("Darwin"):

 Commit: 7bc5a2ba
 Subject: ACPI: Support _OSI("Darwin") correctly

However since this implementation places the judgement in runtime, it
breaks acpi_osi=!Darwin and cannot return unsupported for _OSI("WinXXX")
invoked before invoking _OSI("Darwin").

This patch fixes the issues by reverting the wrong support and implementing
the default behavior of _OSI("Darwin")/_OSI("WinXXX") on Apple hardware via
DMI matching.

Fixes: 7bc5a2ba (ACPI: Support _OSI("Darwin") correctly)
Link: https://bugzilla.kernel.org/show_bug.cgi?id=92111


Reported-and-tested-by: default avatarLukas Wunner <lukas@wunner.de>
Signed-off-by: default avatarChen Yu <yu.c.chen@intel.com>
Signed-off-by: default avatarLv Zheng <lv.zheng@intel.com>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent a707edeb

drivers/acpi/blacklist.c

+23 −0
Original line number Diff line number Diff line
@@ -133,6 +133,11 @@ int __init acpi_blacklisted(void) 
	return blacklisted;

}

#ifdef CONFIG_DMI

static int __init dmi_enable_osi_darwin(const struct dmi_system_id *d)

{

	acpi_dmi_osi_darwin(1, d);	/* enable */

	return 0;

}

static int __init dmi_enable_osi_linux(const struct dmi_system_id *d)

{

	acpi_dmi_osi_linux(1, d);	/* enable */
@@ -331,6 +336,24 @@ static struct dmi_system_id acpi_osi_dmi_table[] __initdata = { 
		},

	},



	/*

	 * Enable _OSI("Darwin") for all apple platforms.

	 */

	{

	.callback = dmi_enable_osi_darwin,

	.ident = "Apple hardware",

	.matches = {

		     DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),

		},

	},

	{

	.callback = dmi_enable_osi_darwin,

	.ident = "Apple hardware",

	.matches = {

		     DMI_MATCH(DMI_SYS_VENDOR, "Apple Computer, Inc."),

		},

	},



#ifdef CONFIG_ACPI_REV_OVERRIDE_POSSIBLE

	/*

	 * DELL XPS 13 (2015) switches sound between HDA and I2S

drivers/acpi/osl.c

+51 −7
Original line number Diff line number Diff line
@@ -135,6 +135,9 @@ static struct acpi_osi_config { 
	unsigned int	linux_enable:1;

	unsigned int	linux_dmi:1;

	unsigned int	linux_cmdline:1;

	unsigned int	darwin_enable:1;

	unsigned int	darwin_dmi:1;

	unsigned int	darwin_cmdline:1;

	u8		default_disabling;

} osi_config = {0, 0, 0, 0};
@@ -150,13 +153,12 @@ static u32 acpi_osi_handler(acpi_string interface, u32 supported) 
	}



	if (!strcmp("Darwin", interface)) {

		/*

		 * Apple firmware will behave poorly if it receives positive

		 * answers to "Darwin" and any other OS. Respond positively

		 * to Darwin and then disable all other vendor strings.

		 */

		acpi_update_interfaces(ACPI_DISABLE_ALL_VENDOR_STRINGS);

		supported = ACPI_UINT32_MAX;



		printk_once(KERN_NOTICE PREFIX

			"BIOS _OSI(Darwin) query %s%s\n",

			osi_config.darwin_enable ? "honored" : "ignored",

			osi_config.darwin_cmdline ? " via cmdline" :

			osi_config.darwin_dmi ? " via DMI" : "");

	}



	return supported;
@@ -1783,6 +1785,44 @@ void __init acpi_osi_setup(char *str) 
	}

}



static void __init set_osi_darwin(unsigned int enable)

{

	if (osi_config.darwin_enable != enable)

		osi_config.darwin_enable = enable;



	if (enable) {

		acpi_osi_setup("!");

		acpi_osi_setup("Darwin");

	} else {

		acpi_osi_setup("!!");

		acpi_osi_setup("!Darwin");

	}

}



static void __init acpi_cmdline_osi_darwin(unsigned int enable)

{

	/* cmdline set the default and override DMI */

	osi_config.darwin_cmdline = 1;

	osi_config.darwin_dmi = 0;

	set_osi_darwin(enable);



	return;

}



void __init acpi_dmi_osi_darwin(int enable, const struct dmi_system_id *d)

{

	printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident);



	if (enable == -1)

		return;



	/* DMI knows that this box asks OSI(Darwin) */

	osi_config.darwin_dmi = 1;

	set_osi_darwin(enable);



	return;

}



static void __init set_osi_linux(unsigned int enable)

{

	if (osi_config.linux_enable != enable)
@@ -1870,6 +1910,10 @@ static int __init osi_setup(char *str) 
		acpi_cmdline_osi_linux(1);

	else if (str && !strcmp("!Linux", str))

		acpi_cmdline_osi_linux(0);

	else if (str && !strcmp("Darwin", str))

		acpi_cmdline_osi_darwin(1);

	else if (str && !strcmp("!Darwin", str))

		acpi_cmdline_osi_darwin(0);

	else

		acpi_osi_setup(str);

include/linux/acpi.h

+1 −0
Original line number Diff line number Diff line
@@ -360,6 +360,7 @@ extern char acpi_video_backlight_string[]; 
extern long acpi_is_video_device(acpi_handle handle);

extern int acpi_blacklisted(void);

extern void acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d);

extern void acpi_dmi_osi_darwin(int enable, const struct dmi_system_id *d);

extern void acpi_osi_setup(char *str);

extern bool acpi_osi_is_win8(void);

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