ACPI: EC / PM: Disable non-wakeup GPEs for suspend-to-idle

[ Upstream commit f941d3e41da7f86bdb9dcc1977c2bcc6b89bfe47 ]

There are systems in which non-wakeup GPEs fire during the "noirq"
suspend stage of suspending devices and that effectively prevents the
system that tries to suspend to idle from entering any low-power
state at all.  If the offending GPE fires regularly and often enough,
the system appears to be suspended, but in fact it is in a tight loop
over "noirq" suspend and "noirq" resume of devices all the time.

To prevent that from happening, disable all non-wakeup GPEs except
for the EC GPE for suspend-to-idle (the EC GPE is special, because
on some systems it has to be enabled for power button wakeup events
to be generated as expected).

Fixes: 147a7d9d25ca (ACPI / PM: Do not reconfigure GPEs for suspend-to-idle)
Link: https://bugzilla.kernel.org/show_bug.cgi?id=201987
Reported-by: Zhang Rui <rui.zhang@intel.com>
Tested-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Tested-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c
index d4e5610..9d66a47 100644 (file)
--- a/drivers/acpi/ec.c
+++ b/drivers/acpi/ec.c
@@ -1034,6 +1034,18 @@ void acpi_ec_unblock_transactions(void)
                acpi_ec_start(first_ec, true);
 }
 
+void acpi_ec_mark_gpe_for_wake(void)
+{
+       if (first_ec && !ec_no_wakeup)
+               acpi_mark_gpe_for_wake(NULL, first_ec->gpe);
+}
+
+void acpi_ec_set_gpe_wake_mask(u8 action)
+{
+       if (first_ec && !ec_no_wakeup)
+               acpi_set_gpe_wake_mask(NULL, first_ec->gpe, action);
+}
+
 void acpi_ec_dispatch_gpe(void)
 {
        if (first_ec)

diff --git a/drivers/acpi/internal.h b/drivers/acpi/internal.h
index 530a3f6..f59d0b9 100644 (file)
--- a/drivers/acpi/internal.h
+++ b/drivers/acpi/internal.h
@@ -188,6 +188,8 @@ int acpi_ec_ecdt_probe(void);
 int acpi_ec_dsdt_probe(void);
 void acpi_ec_block_transactions(void);
 void acpi_ec_unblock_transactions(void);
+void acpi_ec_mark_gpe_for_wake(void);
+void acpi_ec_set_gpe_wake_mask(u8 action);
 void acpi_ec_dispatch_gpe(void);
 int acpi_ec_add_query_handler(struct acpi_ec *ec, u8 query_bit,
                              acpi_handle handle, acpi_ec_query_func func,

diff --git a/drivers/acpi/sleep.c b/drivers/acpi/sleep.c
index 754d59f..74c4890 100644 (file)
--- a/drivers/acpi/sleep.c
+++ b/drivers/acpi/sleep.c
@@ -940,6 +940,8 @@ static int lps0_device_attach(struct acpi_device *adev,
 
                acpi_handle_debug(adev->handle, "_DSM function mask: 0x%x\n",
                                  bitmask);
+
+               acpi_ec_mark_gpe_for_wake();
        } else {
                acpi_handle_debug(adev->handle,
                                  "_DSM function 0 evaluation failed\n");
@@ -968,11 +970,16 @@ static int acpi_s2idle_prepare(void)
        if (lps0_device_handle) {
                acpi_sleep_run_lps0_dsm(ACPI_LPS0_SCREEN_OFF);
                acpi_sleep_run_lps0_dsm(ACPI_LPS0_ENTRY);
+
+               acpi_ec_set_gpe_wake_mask(ACPI_GPE_ENABLE);
        }
 
        if (acpi_sci_irq_valid())
                enable_irq_wake(acpi_sci_irq);
 
+       /* Change the configuration of GPEs to avoid spurious wakeup. */
+       acpi_enable_all_wakeup_gpes();
+       acpi_os_wait_events_complete();
        return 0;
 }
 
@@ -1017,10 +1024,14 @@ static void acpi_s2idle_sync(void)
 
 static void acpi_s2idle_restore(void)
 {
+       acpi_enable_all_runtime_gpes();
+
        if (acpi_sci_irq_valid())
                disable_irq_wake(acpi_sci_irq);
 
        if (lps0_device_handle) {
+               acpi_ec_set_gpe_wake_mask(ACPI_GPE_DISABLE);
+
                acpi_sleep_run_lps0_dsm(ACPI_LPS0_EXIT);
                acpi_sleep_run_lps0_dsm(ACPI_LPS0_SCREEN_ON);
        }