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Message-ID: <3cae1ab1-841c-4414-9b70-76d6823cbd16@manjaro.org>
Date: Mon, 27 Nov 2023 15:03:34 +0700
From: Philip Müller <philm@...jaro.org>
To: "Luke D. Jones" <luke@...nes.dev>, hdegoede@...hat.com
Cc: ilpo.jarvinen@...ux.intel.com, corentin.chary@...il.com,
platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/1] platform/x86: asus-wmi: disable USB0 hub on ROG
Ally before suspend
On 27.11.23 06:05, Luke D. Jones wrote:
> ASUS have worked around an issue in XInput where it doesn't support USB
> selective suspend, which 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.
>
> Further to this the MCU powersave option must also be disabled as it can
> cause a number of issues such as:
> - unreliable resume connection of N-Key
> - complete loss of N-Key if the power is plugged in while suspended
> Disabling the powersave option prevents this.
>
> Without this the MCU is unable to initialise itself correctly on resume.
>
> Signed-off-by: Luke D. Jones <luke@...nes.dev>
> ---
> drivers/platform/x86/asus-wmi.c | 50 ++++++++++++++++++++++
> include/linux/platform_data/x86/asus-wmi.h | 3 ++
> 2 files changed, 53 insertions(+)
>
> diff --git a/drivers/platform/x86/asus-wmi.c b/drivers/platform/x86/asus-wmi.c
> index 6a79f16233ab..4ba33dfebfd4 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 +133,11 @@ 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"
> +/* 300ms so far seems to produce a reliable result on AC and battery */
> +#define ASUS_USB0_PWR_EC0_CSEE_WAIT 300
> +
> static const char * const ashs_ids[] = { "ATK4001", "ATK4002", NULL };
>
> static int throttle_thermal_policy_write(struct asus_wmi *);
> @@ -300,6 +306,9 @@ struct asus_wmi {
>
> bool fnlock_locked;
>
> + /* The ROG Ally device requires the MCU USB device be disconnected before suspend */
> + bool ally_mcu_usb_switch;
> +
> struct asus_wmi_debug debug;
>
> struct asus_wmi_driver *driver;
> @@ -4488,6 +4497,8 @@ 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->ally_mcu_usb_switch = 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 +4665,43 @@ 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->ally_mcu_usb_switch) {
> + if (ACPI_FAILURE(acpi_execute_simple_method(NULL, ASUS_USB0_PWR_EC0_CSEE, 0xB8)))
> + dev_err(device, "ROG Ally MCU failed to connect USB dev\n");
> + else
> + msleep(ASUS_USB0_PWR_EC0_CSEE_WAIT);
> + }
> + return 0;
> +}
> +
> +static int asus_hotk_prepare(struct device *device)
> +{
> + struct asus_wmi *asus = dev_get_drvdata(device);
> + int result, err;
> +
> + if (asus->ally_mcu_usb_switch) {
> + /* When powersave is enabled it causes many issues with resume of USB hub */
> + result = asus_wmi_get_devstate_simple(asus, ASUS_WMI_DEVID_MCU_POWERSAVE);
> + if (result == 1) {
> + dev_warn(device, "MCU powersave enabled, disabling to prevent resume issues");
> + err = asus_wmi_set_devstate(ASUS_WMI_DEVID_MCU_POWERSAVE, 0, &result);
> + if (err || result != 1)
> + dev_err(device, "Failed to set MCU powersave mode: %d\n", err);
> + }
> + /* sleep required to ensure USB0 is disabled before sleep continues */
> + if (ACPI_FAILURE(acpi_execute_simple_method(NULL, ASUS_USB0_PWR_EC0_CSEE, 0xB7)))
> + dev_err(device, "ROG Ally MCU failed to disconnect USB dev\n");
> + else
> + msleep(ASUS_USB0_PWR_EC0_CSEE_WAIT);
> + }
> return 0;
> }
>
> @@ -4701,6 +4749,8 @@ 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 ***************************************************************/
> diff --git a/include/linux/platform_data/x86/asus-wmi.h b/include/linux/platform_data/x86/asus-wmi.h
> index 63e630276499..ab1c7deff118 100644
> --- a/include/linux/platform_data/x86/asus-wmi.h
> +++ b/include/linux/platform_data/x86/asus-wmi.h
> @@ -114,6 +114,9 @@
> /* Charging mode - 1=Barrel, 2=USB */
> #define ASUS_WMI_DEVID_CHARGE_MODE 0x0012006C
>
> +/* MCU powersave mode */
> +#define ASUS_WMI_DEVID_MCU_POWERSAVE 0x001200E2
> +
> /* epu is connected? 1 == true */
> #define ASUS_WMI_DEVID_EGPU_CONNECTED 0x00090018
> /* egpu on/off */
Tested-by: Philip Mueller <philm@...jaro.org>
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