linux-kernel - [PATCH] ACPI / LPSS: Don't skip late system PM ops for hibernate on BYT/CHT

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Date:   Wed,  3 Apr 2019 13:43:52 +0800
From:   Kai-Heng Feng <kai.heng.feng@...onical.com>
To:     rjw@...ysocki.net
Cc:     lenb@...nel.org, hdegoede@...hat.com, rhowell@...o.edu,
        linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
        Kai-Heng Feng <kai.heng.feng@...onical.com>
Subject: [PATCH] ACPI / LPSS: Don't skip late system PM ops for hibernate on BYT/CHT

i2c-designware-platdrv fails to work after the system restored from
hibernation:
[ 272.775692] i2c_designware 80860F41:00: Unknown Synopsys component type: 0xffffffff

Commit 48402cee6889 ("ACPI / LPSS: Resume BYT/CHT I2C controllers from
resume_noirq") makes acpi_lpss_{suspend_late,resume_early}() bail early
on BYT/CHT as resume_from_noirq is set. This means dw_i2c_plat_resume()
doesn't gets called by acpi_lpss_resume_early(), and this causes the
issue.

Introduce acpi_lpss_{poweroff_late,restore_early}() to make sure
driver's own poweroff_late and restore_early get called.

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=202139
Fixes: 48402cee6889 ("ACPI / LPSS: Resume BYT/CHT I2C controllers from resume_noirq")
Signed-off-by: Kai-Heng Feng <kai.heng.feng@...onical.com>
---
 drivers/acpi/acpi_lpss.c | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/drivers/acpi/acpi_lpss.c b/drivers/acpi/acpi_lpss.c
index 1e2a10a06b9d..49aef186d73d 100644
--- a/drivers/acpi/acpi_lpss.c
+++ b/drivers/acpi/acpi_lpss.c
@@ -1058,6 +1058,11 @@ static int acpi_lpss_suspend_late(struct device *dev)
 	return acpi_lpss_do_suspend_late(dev);
 }
 
+static int acpi_lpss_poweroff_late(struct device *dev)
+{
+	return acpi_lpss_do_suspend_late(dev);
+}
+
 static int acpi_lpss_suspend_noirq(struct device *dev)
 {
 	struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
@@ -1089,6 +1094,11 @@ static int acpi_lpss_resume_early(struct device *dev)
 	return acpi_lpss_do_resume_early(dev);
 }
 
+static int acpi_lpss_restore_early(struct device *dev)
+{
+	return acpi_lpss_do_resume_early(dev);
+}
+
 static int acpi_lpss_resume_noirq(struct device *dev)
 {
 	struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
@@ -1141,10 +1151,10 @@ static struct dev_pm_domain acpi_lpss_pm_domain = {
 		.freeze_noirq = acpi_subsys_freeze_noirq,
 		.thaw_noirq = acpi_subsys_thaw_noirq,
 		.poweroff = acpi_subsys_suspend,
-		.poweroff_late = acpi_lpss_suspend_late,
+		.poweroff_late = acpi_lpss_poweroff_late,
 		.poweroff_noirq = acpi_subsys_suspend_noirq,
 		.restore_noirq = acpi_subsys_resume_noirq,
-		.restore_early = acpi_lpss_resume_early,
+		.restore_early = acpi_lpss_restore_early,
 #endif
 		.runtime_suspend = acpi_lpss_runtime_suspend,
 		.runtime_resume = acpi_lpss_runtime_resume,
-- 
2.17.1