linux-kernel - [PATCH 4.18 032/158] ACPI / LPSS: Force LPSS quirks on boot

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Message-Id: <20180917211712.495081607@linuxfoundation.org>
Date:   Tue, 18 Sep 2018 00:41:02 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Zhang Rui <rui.zhang@...el.com>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>
Subject: [PATCH 4.18 032/158] ACPI / LPSS: Force LPSS quirks on boot

4.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Zhang Rui <rui.zhang@...el.com>

commit f11fc4bc669b8622510c1039499f5a9d24248fec upstream.

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@...ikoda.com>
Signed-off-by: Zhang Rui <rui.zhang@...el.com>
Cc: 4.15+ <stable@...r.kernel.org> # 4.15+: 12864ff8545f (ACPI / LPSS: Avoid ...)
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/acpi/acpi_lpss.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/acpi/acpi_lpss.c
+++ b/drivers/acpi/acpi_lpss.c
@@ -879,7 +879,7 @@ static void acpi_lpss_dismiss(struct 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)
 {