ACPI: Unconditionally set SCI_EN on resume

The ACPI spec tells us that the firmware will reenable SCI_EN on resume.
Reality disagrees in some cases. The ACPI spec tells us that the only way
to set SCI_EN is via an SMM call.
https://bugzilla.kernel.org/show_bug.cgi?id=13745 shows us that doing so
may break machines. Tracing the ACPI calls made by Windows shows that it
unconditionally sets SCI_EN on resume with a direct register write, and
therefore the overwhelming probability is that everything is fine with
this behaviour.

Signed-off-by: Matthew Garrett <mjg@redhat.com>
Tested-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Len Brown <len.brown@intel.com>

3 files changed, 2 insertions, 158 deletions

diff --git a/arch/x86/kernel/acpi/sleep.c b/arch/x86/kernel/acpi/sleep.c
index f9961034e557..82e508677b91 100644
--- a/arch/x86/kernel/acpi/sleep.c
+++ b/arch/x86/kernel/acpi/sleep.c
@@ -162,8 +162,6 @@ static int __init acpi_sleep_setup(char *str)
 #endif
                 if (strncmp(str, "old_ordering", 12) == 0)
                         acpi_old_suspend_ordering();
-                if (strncmp(str, "sci_force_enable", 16) == 0)
-                        acpi_set_sci_en_on_resume();
                 str = strchr(str, ',');
                 if (str != NULL)
                         str += strspn(str, ", \t");
diff --git a/drivers/acpi/sleep.c b/drivers/acpi/sleep.c
index baa76bbf244a..4ab2275b4461 100644
--- a/drivers/acpi/sleep.c
+++ b/drivers/acpi/sleep.c
@@ -80,22 +80,6 @@ static int acpi_sleep_prepare(u32 acpi_state)
 
 #ifdef CONFIG_ACPI_SLEEP
 static u32 acpi_target_sleep_state = ACPI_STATE_S0;
-/*
- * According to the ACPI specification the BIOS should make sure that ACPI is
- * enabled and SCI_EN bit is set on wake-up from S1 - S3 sleep states.  Still,
- * some BIOSes don't do that and therefore we use acpi_enable() to enable ACPI
- * on such systems during resume.  Unfortunately that doesn't help in
- * particularly pathological cases in which SCI_EN has to be set directly on
- * resume, although the specification states very clearly that this flag is
- * owned by the hardware.  The set_sci_en_on_resume variable will be set in such
- * cases.
- */
-static bool set_sci_en_on_resume;
-
-void __init acpi_set_sci_en_on_resume(void)
-{
-        set_sci_en_on_resume = true;
-}
 
 /*
  * ACPI 1.0 wants us to execute _PTS before suspending devices, so we allow the
@@ -253,11 +237,8 @@ static int acpi_suspend_enter(suspend_state_t pm_state)
                 break;
         }
 
-        /* If ACPI is not enabled by the BIOS, we need to enable it here. */
-        if (set_sci_en_on_resume)
-                acpi_write_bit_register(ACPI_BITREG_SCI_ENABLE, 1);
-        else
-                acpi_enable();
+        /* This violates the spec but is required for bug compatibility. */
+        acpi_write_bit_register(ACPI_BITREG_SCI_ENABLE, 1);
 
         /* Reprogram control registers and execute _BFS */
         acpi_leave_sleep_state_prep(acpi_state);
@@ -346,12 +327,6 @@ static int __init init_old_suspend_ordering(const struct dmi_system_id *d)
         return 0;
 }
 
-static int __init init_set_sci_en_on_resume(const struct dmi_system_id *d)
-{
-        set_sci_en_on_resume = true;
-        return 0;
-}
-
 static struct dmi_system_id __initdata acpisleep_dmi_table[] = {
         {
         .callback = init_old_suspend_ordering,
@@ -370,22 +345,6 @@ static struct dmi_system_id __initdata acpisleep_dmi_table[] = {
                 },
         },
         {
-        .callback = init_set_sci_en_on_resume,
-        .ident = "Apple MacBook 1,1",
-        .matches = {
-                DMI_MATCH(DMI_SYS_VENDOR, "Apple Computer, Inc."),
-                DMI_MATCH(DMI_PRODUCT_NAME, "MacBook1,1"),
-                },
-        },
-        {
-        .callback = init_set_sci_en_on_resume,
-        .ident = "Apple MacMini 1,1",
-        .matches = {
-                DMI_MATCH(DMI_SYS_VENDOR, "Apple Computer, Inc."),
-                DMI_MATCH(DMI_PRODUCT_NAME, "Macmini1,1"),
-                },
-        },
-        {
         .callback = init_old_suspend_ordering,
         .ident = "Asus Pundit P1-AH2 (M2N8L motherboard)",
         .matches = {
@@ -394,94 +353,6 @@ static struct dmi_system_id __initdata acpisleep_dmi_table[] = {
                 },
         },
         {
-        .callback = init_set_sci_en_on_resume,
-        .ident = "Toshiba Satellite L300",
-        .matches = {
-                DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
-                DMI_MATCH(DMI_PRODUCT_NAME, "Satellite L300"),
-                },
-        },
-        {
-        .callback = init_set_sci_en_on_resume,
-        .ident = "Hewlett-Packard HP G7000 Notebook PC",
-        .matches = {
-                DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
-                DMI_MATCH(DMI_PRODUCT_NAME, "HP G7000 Notebook PC"),
-                },
-        },
-        {
-        .callback = init_set_sci_en_on_resume,
-        .ident = "Hewlett-Packard HP Pavilion dv3 Notebook PC",
-        .matches = {
-                DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
-                DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion dv3 Notebook PC"),
-                },
-        },
-        {
-        .callback = init_set_sci_en_on_resume,
-        .ident = "Hewlett-Packard Pavilion dv4",
-        .matches = {
-                DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
-                DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion dv4"),
-                },
-        },
-        {
-        .callback = init_set_sci_en_on_resume,
-        .ident = "Hewlett-Packard Pavilion dv7",
-        .matches = {
-                DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
-                DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion dv7"),
-                },
-        },
-        {
-        .callback = init_set_sci_en_on_resume,
-        .ident = "Hewlett-Packard Compaq Presario C700 Notebook PC",
-        .matches = {
-                DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
-                DMI_MATCH(DMI_PRODUCT_NAME, "Compaq Presario C700 Notebook PC"),
-                },
-        },
-        {
-        .callback = init_set_sci_en_on_resume,
-        .ident = "Hewlett-Packard Compaq Presario CQ40 Notebook PC",
-        .matches = {
-                DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
-                DMI_MATCH(DMI_PRODUCT_NAME, "Compaq Presario CQ40 Notebook PC"),
-                },
-        },
-        {
-        .callback = init_set_sci_en_on_resume,
-        .ident = "Lenovo ThinkPad T410",
-        .matches = {
-                DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
-                DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T410"),
-                },
-        },
-        {
-        .callback = init_set_sci_en_on_resume,
-        .ident = "Lenovo ThinkPad T510",
-        .matches = {
-                DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
-                DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T510"),
-                },
-        },
-        {
-        .callback = init_set_sci_en_on_resume,
-        .ident = "Lenovo ThinkPad W510",
-        .matches = {
-                DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
-                DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad W510"),
-                },
-        },
-        {
-        .callback = init_set_sci_en_on_resume,
-        .ident = "Lenovo ThinkPad X201[s]",
-        .matches = {
-                DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
-                DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X201"),
-                },
-        },
-        {
         .callback = init_old_suspend_ordering,
         .ident = "Panasonic CF51-2L",
         .matches = {
@@ -490,30 +361,6 @@ static struct dmi_system_id __initdata acpisleep_dmi_table[] = {
                 DMI_MATCH(DMI_BOARD_NAME, "CF51-2L"),
                 },
         },
-        {
-        .callback = init_set_sci_en_on_resume,
-        .ident = "Dell Studio 1558",
-        .matches = {
-                DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
-                DMI_MATCH(DMI_PRODUCT_NAME, "Studio 1558"),
-                },
-        },
-        {
-        .callback = init_set_sci_en_on_resume,
-        .ident = "Dell Studio 1557",
-        .matches = {
-                DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
-                DMI_MATCH(DMI_PRODUCT_NAME, "Studio 1557"),
-                },
-        },
-        {
-        .callback = init_set_sci_en_on_resume,
-        .ident = "Dell Studio 1555",
-        .matches = {
-                DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
-                DMI_MATCH(DMI_PRODUCT_NAME, "Studio 1555"),
-                },
-        },
         {},
 };
 #endif /* CONFIG_SUSPEND */
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index b926afe8c03e..87ca4913294c 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -251,7 +251,6 @@ int acpi_check_mem_region(resource_size_t start, resource_size_t n,
 void __init acpi_no_s4_hw_signature(void);
 void __init acpi_old_suspend_ordering(void);
 void __init acpi_s4_no_nvs(void);
-void __init acpi_set_sci_en_on_resume(void);
 #endif /* CONFIG_PM_SLEEP */
 
 struct acpi_osc_context {