[PATCH 1/1][F] platform/x86: hp_wmi: Fix rfkill causing soft blocked wifi

[Timo Aaltonen]

From: Jorge Lopez <jorge.lopez2 at hp.com>

BugLink: https://bugs.launchpad.net/bugs/1996198

After upgrading BIOS to U82 01.02.01 Rev.A, the console is flooded
strange char "^@" which printed out every second and makes login
nearly impossible. Also the below messages were shown both in console
and journal/dmesg every second:

usb 1-3: Device not responding to setup address.
usb 1-3: device not accepting address 4, error -71
usb 1-3: device descriptor read/all, error -71
usb usb1-port3: unable to enumerate USB device

Wifi is soft blocked by checking rfkill. When unblocked manually,
after few seconds it would be soft blocked again. So I was suspecting
something triggered rfkill to soft block wifi.  At the end it was
fixed by removing hp_wmi module.

The root cause is the way hp-wmi driver handles command 1B on
post-2009 BIOS.  In pre-2009 BIOS, command 1Bh return 0x4 to indicate
that BIOS no longer controls the power for the wireless devices.

Signed-off-by: Jorge Lopez <jorge.lopez2 at hp.com>
Link: https://bugzilla.kernel.org/show_bug.cgi?id=216468
Reviewed-by: Mario Limonciello <mario.limonciello at amd.com>
Link: https://lore.kernel.org/r/20221028155527.7724-1-jorge.lopez2@hp.com
Cc: stable at vger.kernel.org
Reviewed-by: Hans de Goede <hdegoede at redhat.com>
Signed-off-by: Hans de Goede <hdegoede at redhat.com>
(backported from commit 1598bfa8e1faa932de42e1ee7628a1c4c4263f0a -- fixed some fuzz)
Signed-off-by: Timo Aaltonen <timo.aaltonen at canonical.com>
---
 drivers/platform/x86/hp-wmi.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/platform/x86/hp-wmi.c b/drivers/platform/x86/hp-wmi.c
index c3fdb0ecad96..a67773eca3ac 100644
--- a/drivers/platform/x86/hp-wmi.c
+++ b/drivers/platform/x86/hp-wmi.c
@@ -880,8 +880,16 @@ static int __init hp_wmi_bios_setup(struct platform_device *device)
 	wwan_rfkill = NULL;
 	rfkill2_count = 0;
 
-	if (hp_wmi_rfkill_setup(device))
-		hp_wmi_rfkill2_setup(device);
+	/*
+	 * In pre-2009 BIOS, command 1Bh return 0x4 to indicate that
+	 * BIOS no longer controls the power for the wireless
+	 * devices. All features supported by this command will no
+	 * longer be supported.
+	 */
+	if (!hp_wmi_bios_2009_later()) {
+		if (hp_wmi_rfkill_setup(device))
+			hp_wmi_rfkill2_setup(device);
+	}
 
 	return 0;
 }
-- 
2.37.2