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From 0a399a37fbe6f6b2b9062e1c076df28608b628c9 Mon Sep 17 00:00:00 2001
From: "Luke D. Jones" <luke@ljones.dev>
Date: Fri, 24 Nov 2023 21:13:11 +1300
Subject: [PATCH v2] platform/x86: asus-wmi: disable USB0 hub on ROG Ally
before suspend
ASUS have worked around an issue in XInput where it doesn't support USB
selective suspend, whcih causes suspend issues in Windows. They worked
around this by adjusting the MCU firmware to disable the USB0 hub when
the screen is switched off during the Microsoft DSM suspend path in ACPI.
The issue we have with this however is one of timing - the call the tells
the MCU to this isn't able to complete before suspend is done so we call
this in a prepare() and add a small msleep() to ensure it is done. This
must be done before the screen is switched off to prevent a variety of
possible races.
Without this the MCU is unable to initialise itself correctly on resume.
Signed-off-by: Luke D. Jones <luke@ljones.dev>
---
drivers/platform/x86/asus-wmi.c | 40 +++++++++++++++++++++++++++++++++
1 file changed, 40 insertions(+)
diff --git a/drivers/platform/x86/asus-wmi.c b/drivers/platform/x86/asus-wmi.c
index 6a79f16233ab..563c9ab31bc7 100644
--- a/drivers/platform/x86/asus-wmi.c
+++ b/drivers/platform/x86/asus-wmi.c
@@ -16,6 +16,7 @@
#include <linux/acpi.h>
#include <linux/backlight.h>
#include <linux/debugfs.h>
+#include <linux/delay.h>
#include <linux/dmi.h>
#include <linux/fb.h>
#include <linux/hwmon.h>
@@ -132,6 +133,9 @@ module_param(fnlock_default, bool, 0444);
#define ASUS_SCREENPAD_BRIGHT_MAX 255
#define ASUS_SCREENPAD_BRIGHT_DEFAULT 60
+/* Controls the power state of the USB0 hub on ROG Ally which input is on */
+#define ASUS_USB0_PWR_EC0_CSEE "\\_SB.PCI0.SBRG.EC0.CSEE"
+
static const char * const ashs_ids[] = { "ATK4001", "ATK4002", NULL };
static int throttle_thermal_policy_write(struct asus_wmi *);
@@ -300,6 +304,9 @@ struct asus_wmi {
bool fnlock_locked;
+ /* The ROG Ally device requires the USB hub to be disabled before suspend */
+ bool pre_suspend_ec0_csee_disable;
+
struct asus_wmi_debug debug;
struct asus_wmi_driver *driver;
@@ -4488,6 +4495,8 @@ static int asus_wmi_add(struct platform_device *pdev)
asus->nv_temp_tgt_available = asus_wmi_dev_is_present(asus, ASUS_WMI_DEVID_NV_THERM_TARGET);
asus->panel_overdrive_available = asus_wmi_dev_is_present(asus, ASUS_WMI_DEVID_PANEL_OD);
asus->mini_led_mode_available = asus_wmi_dev_is_present(asus, ASUS_WMI_DEVID_MINI_LED_MODE);
+ asus->pre_suspend_ec0_csee_disable = acpi_has_method(NULL, ASUS_USB0_PWR_EC0_CSEE)
+ && dmi_match(DMI_BOARD_NAME, "RC71L");
err = fan_boost_mode_check_present(asus);
if (err)
@@ -4654,6 +4663,35 @@ static int asus_hotk_resume(struct device *device)
asus_wmi_fnlock_update(asus);
asus_wmi_tablet_mode_get_state(asus);
+
+ return 0;
+}
+
+static int asus_hotk_resume_early(struct device *device)
+{
+ struct asus_wmi *asus = dev_get_drvdata(device);
+
+ if (asus->pre_suspend_ec0_csee_disable) {
+ /* sleep required to ensure USB0 is enabled before drivers notice */
+ if (ACPI_FAILURE(acpi_execute_simple_method(NULL, ASUS_USB0_PWR_EC0_CSEE, 0xB8)))
+ pr_warn("ASUS ROG Ally failed to set USB hub power on\n");
+ }
+
+ return 0;
+}
+
+static int asus_hotk_prepare(struct device *device)
+{
+ struct asus_wmi *asus = dev_get_drvdata(device);
+
+ if (asus->pre_suspend_ec0_csee_disable) {
+ /* sleep required to ensure USB0 is disabled before sleep continues */
+ if (ACPI_FAILURE(acpi_execute_simple_method(NULL, ASUS_USB0_PWR_EC0_CSEE, 0xB7)))
+ pr_warn("ASUS ROG Ally failed to set USB hub power off\n");
+ else
+ msleep(100);
+ }
+
return 0;
}
@@ -4701,6 +4739,8 @@ static const struct dev_pm_ops asus_pm_ops = {
.thaw = asus_hotk_thaw,
.restore = asus_hotk_restore,
.resume = asus_hotk_resume,
+ .resume_early = asus_hotk_resume_early,
+ .prepare = asus_hotk_prepare,
};
/* Registration ***************************************************************/
--
2.43.0
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