From d74ce3ece4028a85aacf0d26a5ce13c872fcb949 Mon Sep 17 00:00:00 2001 From: Akihiko Odaki Date: Tue, 16 Aug 2022 19:21:20 +0900 Subject: [PATCH] HID: AMD_SFH: Add a DMI quirk entry for Chromebooks 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 Suggested-by: Mario Limonciello Acked-by: Basavaraj Natikar Signed-off-by: Jiri Kosina Signed-off-by: Greg Kroah-Hartman --- drivers/hid/amd-sfh-hid/amd_sfh_pcie.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/drivers/hid/amd-sfh-hid/amd_sfh_pcie.c b/drivers/hid/amd-sfh-hid/amd_sfh_pcie.c index 13a4db4..f17f061 100644 --- a/drivers/hid/amd-sfh-hid/amd_sfh_pcie.c +++ b/drivers/hid/amd-sfh-hid/amd_sfh_pcie.c @@ -281,11 +281,29 @@ static int amd_sfh_irq_init(struct amd_mp2_dev *privdata) 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; -- 2.7.4