This is a note to let you know that I've just added the patch titled
platform/x86: intel-vbtn: Update tablet mode switch at end of probe
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:
platform-x86-intel-vbtn-update-tablet-mode-switch-at.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.
commit fa9f9fe0de1fbf94914fcfb3c4a669b66bfaadc4
Author: Gwendal Grignou <gwendal@xxxxxxxxxxxx>
Date: Fri Mar 29 07:32:06 2024 -0700
platform/x86: intel-vbtn: Update tablet mode switch at end of probe
[ Upstream commit 434e5781d8cd2d0ed512d920c6cdeba4b33a2e81 ]
ACER Vivobook Flip (TP401NAS) virtual intel switch is implemented as
follow:
Device (VGBI)
{
Name (_HID, EisaId ("INT33D6") ...
Name (VBDS, Zero)
Method (_STA, 0, Serialized) // _STA: Status ...
Method (VBDL, 0, Serialized)
{
PB1E |= 0x20
VBDS |= 0x40
}
Method (VGBS, 0, Serialized)
{
Return (VBDS) /* \_SB_.PCI0.SBRG.EC0_.VGBI.VBDS */
}
...
}
By default VBDS is set to 0. At boot it is set to clamshell (bit 6 set)
only after method VBDL is executed.
Since VBDL is now evaluated in the probe routine later, after the device
is registered, the retrieved value of VBDS was still 0 ("tablet mode")
when setting up the virtual switch.
Make sure to evaluate VGBS after VBDL, to ensure the
convertible boots in clamshell mode, the expected default.
Fixes: 26173179fae1 ("platform/x86: intel-vbtn: Eval VBDL after registering our notifier")
Signed-off-by: Gwendal Grignou <gwendal@xxxxxxxxxxxx>
Reviewed-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@xxxxxxxxxxxxxxx>
Reviewed-by: Hans de Goede <hdegoede@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20240329143206.2977734-3-gwendal@xxxxxxxxxxxx
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@xxxxxxxxxxxxxxx>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@xxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/platform/x86/intel/vbtn.c b/drivers/platform/x86/intel/vbtn.c
index 6fb3e597c57aa..4e9d3f25c35d0 100644
--- a/drivers/platform/x86/intel/vbtn.c
+++ b/drivers/platform/x86/intel/vbtn.c
@@ -136,8 +136,6 @@ static int intel_vbtn_input_setup(struct platform_device *device)
priv->switches_dev->id.bustype = BUS_HOST;
if (priv->has_switches) {
- detect_tablet_mode(&device->dev);
-
ret = input_register_device(priv->switches_dev);
if (ret)
return ret;
@@ -316,6 +314,9 @@ static int intel_vbtn_probe(struct platform_device *device)
if (ACPI_FAILURE(status))
dev_err(&device->dev, "Error VBDL failed with ACPI status %d\n", status);
}
+ // Check switches after buttons since VBDL may have side effects.
+ if (has_switches)
+ detect_tablet_mode(&device->dev);
device_init_wakeup(&device->dev, true);
/*
