From a64a62ce9a380213dc9e192f762266d70c9b40ec Mon Sep 17 00:00:00 2001 From: Lv Zheng Date: Tue, 26 Sep 2017 16:54:09 +0800 Subject: ACPI / EC: Fix regression related to PM ops support in ECDT device On platforms (ASUS X550ZE and possibly all ASUS X series) with valid ECDT EC but invalid DSDT EC, EC PM ops won't be invoked as ECDT EC is not an ACPI device. Thus the following commit actually removed post-resume acpi_ec_enable_event() invocation for such platforms, and triggered a regression on them that after being resumed, EC (actually should be ECDT) driver stops handling EC events: Commit: c2b46d679b30c5c0d7eb47a21085943242bdd8dc Subject: ACPI / EC: Add PM operations to improve event handling for resume process Notice that the root cause actually is "ECDT is not an ACPI device" rather than "the timing of acpi_ec_enable_event() invocation", this patch fixes this issue by enumerating ECDT EC as an ACPI device. Due to the existence of the noirq stage, the ability of tuning the timing of acpi_ec_enable_event() invocation is still meaningful. This patch is a little bit different from the posted fix by moving acpi_config_boot_ec() from acpi_ec_ecdt_start() to acpi_ec_add() to make sure that EC event handling won't be stopped as long as the ACPI EC driver is bound. Thus the following sequence shouldn't disable EC event handling: unbind,suspend,resume,bind. Fixes: c2b46d679b30 (ACPI / EC: Add PM operations to improve event handling for resume process) Link: https://bugzilla.kernel.org/show_bug.cgi?id=196847 Reported-by: Luya Tshimbalanga Tested-by: Luya Tshimbalanga Cc: 4.9+ # 4.9+ Signed-off-by: Lv Zheng Signed-off-by: Rafael J. Wysocki --- drivers/acpi/scan.c | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) (limited to 'drivers/acpi/scan.c') diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c index 602f8ff212f2..2f2f50322ffb 100644 --- a/drivers/acpi/scan.c +++ b/drivers/acpi/scan.c @@ -1024,6 +1024,9 @@ static void acpi_device_get_busid(struct acpi_device *device) case ACPI_BUS_TYPE_SLEEP_BUTTON: strcpy(device->pnp.bus_id, "SLPF"); break; + case ACPI_BUS_TYPE_ECDT_EC: + strcpy(device->pnp.bus_id, "ECDT"); + break; default: acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer); /* Clean up trailing underscores (if any) */ @@ -1304,6 +1307,9 @@ static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp, case ACPI_BUS_TYPE_SLEEP_BUTTON: acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF); break; + case ACPI_BUS_TYPE_ECDT_EC: + acpi_add_id(pnp, ACPI_ECDT_HID); + break; } } @@ -2049,6 +2055,21 @@ void acpi_bus_trim(struct acpi_device *adev) } EXPORT_SYMBOL_GPL(acpi_bus_trim); +int acpi_bus_register_early_device(int type) +{ + struct acpi_device *device = NULL; + int result; + + result = acpi_add_single_object(&device, NULL, + type, ACPI_STA_DEFAULT); + if (result) + return result; + + device->flags.match_driver = true; + return device_attach(&device->dev); +} +EXPORT_SYMBOL_GPL(acpi_bus_register_early_device); + static int acpi_bus_scan_fixed(void) { int result = 0; -- cgit v1.2.3-70-g09d2