linux-kernel - [PATCH v3] Fix WWAN device disabled issue after S3 deep

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Date:   Mon,  8 Nov 2021 14:06:48 +0800
From:   Slark Xiao <slark_xiao@....com>
To:     hmh@....eng.br, hdegoede@...hat.com, mgross@...ux.intel.com
Cc:     markpearson@...ovo.com, njoshi1@...ovo.com,
        ibm-acpi-devel@...ts.sourceforge.net,
        platform-driver-x86@...r.kernel.or, linux-kernel@...r.kernel.org,
        Slark Xiao <slark_xiao@....com>
Subject: [PATCH v3] Fix WWAN device disabled issue after S3 deep

When WWAN device wake from S3 deep, under thinkpad platform,
WWAN would be disabled. This disable status could be checked
by command 'nmcli r wwan' or 'rfkill list'.

Issue analysis as below:
  When host resume from S3 deep, thinkpad_acpi driver would
call hotkey_resume() function. Finnaly, it will use
wan_get_status to check the current status of WWAN device.
During this resume progress, wan_get_status would always
return off even WWAN boot up completely.
  In patch V2, Hans said 'sw_state should be unchanged
after a suspend/resume. It's better to drop the
tpacpi_rfk_update_swstate call all together from the
resume path'.
  And it's confimed by Lenovo that GWAN is no longer
 available from WHL generation because the design does not
 match with current pin control.

Signed-off-by: Slark Xiao <slark_xiao@....com>
---
 drivers/platform/x86/thinkpad_acpi.c | 12 ------------
 1 file changed, 12 deletions(-)

diff --git a/drivers/platform/x86/thinkpad_acpi.c b/drivers/platform/x86/thinkpad_acpi.c
index 50ff04c84650..f1cbd27282e1 100644
--- a/drivers/platform/x86/thinkpad_acpi.c
+++ b/drivers/platform/x86/thinkpad_acpi.c
@@ -1178,15 +1178,6 @@ static int tpacpi_rfk_update_swstate(const struct tpacpi_rfk *tp_rfk)
 	return status;
 }

-/* Query FW and update rfkill sw state for all rfkill switches */
-static void tpacpi_rfk_update_swstate_all(void)
-{
-	unsigned int i;
-
-	for (i = 0; i < TPACPI_RFK_SW_MAX; i++)
-		tpacpi_rfk_update_swstate(tpacpi_rfkill_switches[i]);
-}
-
 /*
  * Sync the HW-blocking state of all rfkill switches,
  * do notice it causes the rfkill core to schedule uevents
@@ -3129,9 +3120,6 @@ static void tpacpi_send_radiosw_update(void)
 	if (wlsw == TPACPI_RFK_RADIO_OFF)
 		tpacpi_rfk_update_hwblock_state(true);

-	/* Sync sw blocking state */
-	tpacpi_rfk_update_swstate_all();
-
 	/* Sync hw blocking state last if it is hw-unblocked */
 	if (wlsw == TPACPI_RFK_RADIO_ON)
 		tpacpi_rfk_update_hwblock_state(false);
-- 
2.25.1