Hi, Rafael > From: Rafael J. Wysocki [mailto:rjw@xxxxxxxxxxxxx] > Subject: Re: [PATCH 3/3] ACPI / scan: Enable GPEs before scanning the namespace > > On Tuesday, August 15, 2017 4:12:24 AM CEST Zheng, Lv wrote: > > Hi, Rafael > > > > > From: linux-acpi-owner@xxxxxxxxxxxxxxx [mailto:linux-acpi-owner@xxxxxxxxxxxxxxx] On Behalf Of > Rafael J. > > > Wysocki > > > Subject: [PATCH 3/3] ACPI / scan: Enable GPEs before scanning the namespace > > > > > > From: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx> > > > > > > On some systems the platform firmware expects GPEs to be enabled > > > before the enumeration of devices and if that expectation is not > > > met, the systems in question may not boot in some situations. > > > > > > For this reason, change the initialization ordering of the ACPI > > > subsystem to make it enable GPEs before scanning the namespace > > > for the first time in order to enumerate devices. > > > > > > Reported-by: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx> > > > Suggested-by: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx> > > > Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx> > > > --- > > > drivers/acpi/scan.c | 8 ++++---- > > > 1 file changed, 4 insertions(+), 4 deletions(-) > > > > > > Index: linux-pm/drivers/acpi/scan.c > > > =================================================================== > > > --- linux-pm.orig/drivers/acpi/scan.c > > > +++ linux-pm/drivers/acpi/scan.c > > > @@ -2139,6 +2139,10 @@ int __init acpi_scan_init(void) > > > acpi_get_spcr_uart_addr(); > > > } > > > > > > + acpi_gpe_apply_masked_gpes(); > > > + acpi_update_all_gpes(); > > > + acpi_ec_ecdt_start(); > > > + > > > > Just for your information. > > A recent internal bug reveals that acpi_ec_ecdt_start() should only be > > invoked after the enumeration (acpi_ec_add()) for now. > > The function contains logics that need to be altered by acpi_ec_add(). > > > > So it seems we can only do less aggressive change by moving the GPE > > related 2 lines up. > > OK, done. > > Please check my linux-next branch and see if that's what it should be. I confirmed. And refreshed my EC regression fix on top of that with v2 tagged in the subjects. Thanks and best regards Lv -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
