linux-kernel - [PATCH] hwmon: (dell-smm) Disable fan support for Dell XPS13 9333

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Message-Id: <20180605173833.27003-1-kernelorg@elchenberg.name>
Date:   Tue,  5 Jun 2018 19:38:32 +0200
From:   Helge Eichelberg <kernelorg@...henberg.name>
To:     unlisted-recipients:; (no To-header on input)
Cc:     Helge Eichelberg <kernelorg@...henberg.name>,
        Pali Rohár <pali.rohar@...il.com>,
        Jean Delvare <jdelvare@...e.com>,
        Guenter Roeck <linux@...ck-us.net>,
        linux-hwmon@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] hwmon: (dell-smm) Disable fan support for Dell XPS13 9333

Calling fan related SMM functions implemented by Dell BIOS firmware on Dell
XPS13 9333 freeze kernel for about 500ms. Until Dell fixes it we need to
disable fan support for Dell XPS13 9333.

Via "force" module param fan support can be enabled.

Link: https://bugzilla.kernel.org/show_bug.cgi?id=195751
Signed-off-by: Helge Eichelberg <kernelorg@...henberg.name>
---
 drivers/hwmon/dell-smm-hwmon.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/hwmon/dell-smm-hwmon.c b/drivers/hwmon/dell-smm-hwmon.c
index bf3bb7e1adab..9d3ef879dc51 100644
--- a/drivers/hwmon/dell-smm-hwmon.c
+++ b/drivers/hwmon/dell-smm-hwmon.c
@@ -1074,6 +1074,13 @@ static struct dmi_system_id i8k_blacklist_fan_support_dmi_table[] __initdata = {
 			DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Vostro 3360"),
 		},
 	},
+	{
+		.ident = "Dell XPS13 9333",
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
+			DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "XPS13 9333"),
+		},
+	},
 	{ }
 };
 
-- 
2.14.1