From: Michał Kępień <kernel@kempniu.pl>
Date: Fri, 16 Jun 2017 04:40:56 +0000 (+0200)
Subject: platform/x86: fujitsu-laptop: do not update ACPI device power status
X-Git-Tag: v4.13-rc1~135^2~3
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=1c1946269f6a7b3c96a7164f0c9b48854ac8a6e2;p=karo-tx-linux.git

platform/x86: fujitsu-laptop: do not update ACPI device power status

Calling acpi_bus_update_power() for ACPI devices FUJ02B1 and FUJ02E3 is
pointless as they are not power manageable (neither _PS0 nor _PR0 is
defined for any of them), which causes their power state to be inherited
from their parent devices.  Given the ACPI paths of these two devices
(\_SB.PCI0.LPCB.FJEX, \_SB.FEXT), their parent devices are also not
power manageable.  These parent devices will thus have their power state
initialized to ACPI_STATE_D0, which in turn causes the power state for
both FUJ02B1 and FUJ02E3 to always be ACPI_STATE_D0 ("on").

Remove relevant acpi_bus_update_power() calls along with parts of debug
messages that they were supposed to have an effect on.

Signed-off-by: Michał Kępień <kernel@kempniu.pl>
Reviewed-by: Jonathan Woithe <jwoithe@just42.net>
Signed-off-by: Darren Hart (VMware) <dvhart@infradead.org>
---

diff --git a/drivers/platform/x86/fujitsu-laptop.c b/drivers/platform/x86/fujitsu-laptop.c
index c01b8ed99478..1ab7a115094b 100644
--- a/drivers/platform/x86/fujitsu-laptop.c
+++ b/drivers/platform/x86/fujitsu-laptop.c
@@ -402,7 +402,6 @@ static int fujitsu_backlight_register(struct acpi_device *device)
 static int acpi_fujitsu_bl_add(struct acpi_device *device)
 {
 	struct fujitsu_bl *priv;
-	int state = 0;
 	int error;
 
 	if (acpi_video_get_backlight_type() != acpi_backlight_vendor)
@@ -421,15 +420,8 @@ static int acpi_fujitsu_bl_add(struct acpi_device *device)
 	if (error)
 		return error;
 
-	error = acpi_bus_update_power(device->handle, &state);
-	if (error) {
-		pr_err("Error reading power state\n");
-		return error;
-	}
-
-	pr_info("ACPI: %s [%s] (%s)\n",
-	       acpi_device_name(device), acpi_device_bid(device),
-	       !device->power.state ? "on" : "off");
+	pr_info("ACPI: %s [%s]\n",
+		acpi_device_name(device), acpi_device_bid(device));
 
 	if (acpi_has_method(device->handle, METHOD_NAME__INI)) {
 		vdbg_printk(FUJLAPTOP_DBG_INFO, "Invoking _INI\n");
@@ -790,7 +782,6 @@ static int acpi_fujitsu_laptop_leds_register(struct acpi_device *device)
 static int acpi_fujitsu_laptop_add(struct acpi_device *device)
 {
 	struct fujitsu_laptop *priv;
-	int state = 0;
 	int error;
 	int i;
 
@@ -818,15 +809,8 @@ static int acpi_fujitsu_laptop_add(struct acpi_device *device)
 	if (error)
 		goto err_free_fifo;
 
-	error = acpi_bus_update_power(device->handle, &state);
-	if (error) {
-		pr_err("Error reading power state\n");
-		goto err_free_fifo;
-	}
-
-	pr_info("ACPI: %s [%s] (%s)\n",
-		acpi_device_name(device), acpi_device_bid(device),
-		!device->power.state ? "on" : "off");
+	pr_info("ACPI: %s [%s]\n",
+		acpi_device_name(device), acpi_device_bid(device));
 
 	if (acpi_has_method(device->handle, METHOD_NAME__INI)) {
 		vdbg_printk(FUJLAPTOP_DBG_INFO, "Invoking _INI\n");