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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Akihiko Odaki <akihiko.odaki@gmail.com>,
        Mario Limonciello <mario.limonciello@amd.com>,
        Basavaraj Natikar <Basavaraj.Natikar@amd.com>,
        Jiri Kosina <jkosina@suse.cz>
Subject: [PATCH 5.19 22/72] HID: AMD_SFH: Add a DMI quirk entry for Chromebooks
Date:   Fri,  2 Sep 2022 14:18:58 +0200
Message-Id: <20220902121405.511661631@linuxfoundation.org>
In-Reply-To: <20220902121404.772492078@linuxfoundation.org>
References: <20220902121404.772492078@linuxfoundation.org>
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From: Akihiko Odaki <akihiko.odaki@gmail.com>

commit adada3f4930ac084740ea340bd8e94028eba4f22 upstream.

Google Chromebooks use Chrome OS Embedded Controller Sensor Hub instead
of Sensor Hub Fusion and leaves MP2 uninitialized, which disables all
functionalities, even including the registers necessary for feature
detections.

The behavior was observed with Lenovo ThinkPad C13 Yoga.

Signed-off-by: Akihiko Odaki <akihiko.odaki@gmail.com>
Suggested-by: Mario Limonciello <mario.limonciello@amd.com>
Acked-by: Basavaraj Natikar <Basavaraj.Natikar@amd.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/hid/amd-sfh-hid/amd_sfh_pcie.c |   18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

--- a/drivers/hid/amd-sfh-hid/amd_sfh_pcie.c
+++ b/drivers/hid/amd-sfh-hid/amd_sfh_pcie.c
@@ -285,11 +285,29 @@ static int amd_sfh_irq_init(struct amd_m
 	return 0;
 }
 
+static const struct dmi_system_id dmi_nodevs[] = {
+	{
+		/*
+		 * Google Chromebooks use Chrome OS Embedded Controller Sensor
+		 * Hub instead of Sensor Hub Fusion and leaves MP2
+		 * uninitialized, which disables all functionalities, even
+		 * including the registers necessary for feature detections.
+		 */
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "Google"),
+		},
+	},
+	{ }
+};
+
 static int amd_mp2_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 {
 	struct amd_mp2_dev *privdata;
 	int rc;
 
+	if (dmi_first_match(dmi_nodevs))
+		return -ENODEV;
+
 	privdata = devm_kzalloc(&pdev->dev, sizeof(*privdata), GFP_KERNEL);
 	if (!privdata)
 		return -ENOMEM;