[PATCH AUTOSEL 5.19 13/38] HID: AMD_SFH: Add a DMI quirk entry for Chromebooks

Sasha Levin
2022-09-10T21:17:38Z

From: Akihiko Odaki <akihiko.odaki@gmail.com>

[ Upstream commit adada3f4930ac084740ea340bd8e94028eba4f22 ]

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: Sasha Levin <sashal@kernel.org>
---
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 1441787a154a8..9b97dc0695e3a 100644
--- 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_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;
--
2.35.1