[PATCH 1/1] ACPI / LPSS: Force LPSS quirks on boot

[Aaron Ma]

From: Zhang Rui <rui.zhang at intel.com>

BugLink: https://bugs.launchpad.net/bugs/1804604

Commit 12864ff8545f (ACPI / LPSS: Avoid PM quirks on suspend and resume
from hibernation) bypasses lpss quirks for S3 and S4, by setting a flag
for S3/S4 in acpi_lpss_suspend(), and check that flag in
acpi_lpss_resume().

But this overlooks the boot case where acpi_lpss_resume() may get called
without a corresponding acpi_lpss_suspend() having been called.

Thus force setting the flag during boot.

Fixes: 12864ff8545f (ACPI / LPSS: Avoid PM quirks on suspend and resume from hibernation)
Link: https://bugzilla.kernel.org/show_bug.cgi?id=200989
Reported-and-tested-by: William Lieurance <william.lieurance at namikoda.com>
Signed-off-by: Zhang Rui <rui.zhang at intel.com>
Cc: 4.15+ <stable at vger.kernel.org> # 4.15+: 12864ff8545f (ACPI / LPSS: Avoid ...)
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki at intel.com>
(cherry picked from commit f11fc4bc669b8622510c1039499f5a9d24248fec)
Signed-off-by: Aaron Ma <aaron.ma at canonical.com>
---
 drivers/acpi/acpi_lpss.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/acpi/acpi_lpss.c b/drivers/acpi/acpi_lpss.c
index 8e37c2317e27..08b2ceb68066 100644
--- a/drivers/acpi/acpi_lpss.c
+++ b/drivers/acpi/acpi_lpss.c
@@ -736,7 +736,7 @@ static void acpi_lpss_dismiss(struct device *dev)
 #define LPSS_GPIODEF0_DMA_LLP		BIT(13)
 
 static DEFINE_MUTEX(lpss_iosf_mutex);
-static bool lpss_iosf_d3_entered;
+static bool lpss_iosf_d3_entered = true;
 
 static void lpss_iosf_enter_d3_state(void)
 {
-- 
2.17.1