From: Chen Yu <yu.c.chen@xxxxxxxxx>
Commit 7bc5a2bad0b8 ("ACPI: Support _OSI("Darwin") correctly") always
reports positive value when Apple hardware queries _OSI("Darwin"). 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.
Link: https://bugzilla.kernel.org/show_bug.cgi?id=92111
Reported-by: Lukas Wunner <lukas@xxxxxxxxx>
Signed-off-by: Chen Yu <yu.c.chen@xxxxxxxxx>
Signed-off-by: Lv Zheng <lv.zheng@xxxxxxxxx>
---
Documentation/kernel-parameters.txt | 2 ++
drivers/acpi/blacklist.c | 23 ++++++++++++++++
drivers/acpi/osl.c | 49 ++++++++++++++++++++++++++++++-----
include/linux/acpi.h | 1 +
4 files changed, 68 insertions(+), 7 deletions(-)
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 0b3de80..c48f387 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -312,6 +312,8 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
acpi_osi=!* # remove all strings
acpi_osi=! # disable all built-in OS vendor
strings
+ acpi_osi=!! # enable all built-in OS vendor
+ strings
acpi_osi= # disable all strings
'acpi_osi=!' can be used in combination with single or
diff --git a/drivers/acpi/blacklist.c b/drivers/acpi/blacklist.c
index 675a941..8fc1afe 100644
--- a/drivers/acpi/blacklist.c
+++ b/drivers/acpi/blacklist.c
@@ -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(true, d); /* enable */
+ return 0;
+}
static int __init dmi_enable_osi_linux(const struct dmi_system_id *d)
{
acpi_dmi_osi_linux(true, 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
diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
index df1101e..b00657b 100644
--- a/drivers/acpi/osl.c
+++ b/drivers/acpi/osl.c
@@ -136,6 +136,9 @@ 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;
} osi_config;
static u32 acpi_osi_handler(acpi_string interface, u32 supported)
@@ -148,13 +151,11 @@ static u32 acpi_osi_handler(acpi_string interface, u32 supported)
osi_config.linux_dmi ? " via DMI" : "");
}
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;
+ pr_notice_once(
+ "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;
@@ -1486,6 +1487,9 @@ void __init acpi_osi_setup(char *str)
osi->enable = false;
}
return;
+ } else if (*str == '!') {
+ osi_config.default_disabling = 0;
+ return;
}
enable = false;
}
@@ -1503,6 +1507,33 @@ void __init acpi_osi_setup(char *str)
}
}
+static void __init __acpi_osi_setup_darwin(bool 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_osi_setup_darwin(bool enable)
+{
+ osi_config.darwin_cmdline = 1;
+ /* Override acpi_blacklisted() */
+ osi_config.darwin_dmi = 0;
+ __acpi_osi_setup_darwin(enable);
+}
+
+void __init acpi_dmi_osi_darwin(bool enable, const struct dmi_system_id *d)
+{
+ pr_notice("DMI detected to setup _OSI(\"Darwin\"): %s\n", d->ident);
+ osi_config.darwin_dmi = 1;
+ __acpi_osi_setup_darwin(enable);
+}
+
static void __init __acpi_osi_setup_linux(bool enable)
{
osi_config.linux_enable = !!enable;
@@ -1576,6 +1607,10 @@ static int __init osi_setup(char *str)
acpi_osi_setup_linux(true);
else if (str && !strcmp("!Linux", str))
acpi_osi_setup_linux(false);
+ else if (str && !strcmp("Darwin", str))
+ acpi_osi_setup_darwin(true);
+ else if (str && !strcmp("!Darwin", str))
+ acpi_osi_setup_darwin(false);
else
acpi_osi_setup(str);
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index fceea1e..1455919 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -354,6 +354,7 @@ 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(bool enable, const struct dmi_system_id *d);
+extern void acpi_dmi_osi_darwin(bool enable, const struct dmi_system_id *d);
extern void acpi_osi_setup(char *str);
extern bool acpi_osi_is_win8(void);
--
1.7.10
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