This is a note to let you know that I've just added the patch titled
HID: AMD_SFH: Add a DMI quirk entry for Chromebooks
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
hid-amd_sfh-add-a-dmi-quirk-entry-for-chromebooks.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From adada3f4930ac084740ea340bd8e94028eba4f22 Mon Sep 17 00:00:00 2001
From: Akihiko Odaki <akihiko.odaki@xxxxxxxxx>
Date: Tue, 16 Aug 2022 19:21:20 +0900
Subject: HID: AMD_SFH: Add a DMI quirk entry for Chromebooks
From: Akihiko Odaki <akihiko.odaki@xxxxxxxxx>
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@xxxxxxxxx>
Suggested-by: Mario Limonciello <mario.limonciello@xxxxxxx>
Acked-by: Basavaraj Natikar <Basavaraj.Natikar@xxxxxxx>
Signed-off-by: Jiri Kosina <jkosina@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
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
@@ -281,11 +281,29 @@ 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;
Patches currently in stable-queue which might be from akihiko.odaki@xxxxxxxxx are
queue-5.15/hid-amd_sfh-add-a-dmi-quirk-entry-for-chromebooks.patch
