From: "Luke D. Jones" To: hdegoede@redhat.com Cc: corentin.chary@gmail.com, ilpo.jarvinen@linux.intel.com, platform-driver-x86@vger.kernel.org, linux-kernel@vger.kernel.org, "Luke D. Jones" Subject: [PATCH v4 7/9] platform/x86: asus-wmi: ROG Ally increase wait time, allow MCU powersave Date: Thu, 4 Apr 2024 13:16:50 +1300 [thread overview] Message-ID: <20240404001652.86207-8-luke@ljones.dev> (raw) In-Reply-To: <20240404001652.86207-1-luke@ljones.dev> The previous work to allow the MCU to be resumed correctly after sleep and resume tried to take the shortest possible time. However as work continues in various other parts of the s2idle subsystems it has shown that it wasn't entirely reliable. If the MCU disable/enable call is done correctly the MCU fully removes its USB endpoints, and this shows as a full USB device reconnection on resume. When we tried to short this as much as possible sometimes the MCU doesn't get to complete what it needs to do before going to low-power and this affected the reconnection. Through trial it is found that the minimum time required is approx 1200ms to allow a proper disconnect and disable, and the same amount of time on resume is required to prevent a rapid disconnect/reconnect happening on seemingly random occasions. To be safe the time is now 1500ms for msleep. Reviewed-by: Ilpo Järvinen Signed-off-by: Luke D. Jones --- drivers/platform/x86/asus-wmi.c | 12 ++---------- 1 file changed, 2 insertions(+), 10 deletions(-) diff --git a/drivers/platform/x86/asus-wmi.c b/drivers/platform/x86/asus-wmi.c index 976e26c82f80..ab98f91e573c 100644 --- a/drivers/platform/x86/asus-wmi.c +++ b/drivers/platform/x86/asus-wmi.c @@ -140,7 +140,7 @@ module_param(fnlock_default, bool, 0444); /* 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 +#define ASUS_USB0_PWR_EC0_CSEE_WAIT 1500 static const char * const ashs_ids[] = { "ATK4001", "ATK4002", NULL }; @@ -4829,6 +4829,7 @@ static int asus_hotk_resume_early(struct device *device) struct asus_wmi *asus = dev_get_drvdata(device); if (asus->ally_mcu_usb_switch) { + /* sleep required to prevent USB0 being yanked then reappearing rapidly */ 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 @@ -4840,17 +4841,8 @@ static int asus_hotk_resume_early(struct device *device) 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"); -- 2.44.0