From 0c99c5288eb9b1bbc9684b0ec0fd7efc578749b3 Mon Sep 17 00:00:00 2001 From: Zhang Rui Date: Thu, 17 Dec 2009 16:02:08 +0800 Subject: ACPI: Disable explicit power state retrieval on fans If the ACPI power state can be got both directly and indirectly, we prefer to get it indirectly. https://bugzilla.redhat.com/show_bug.cgi?id=531916 describes a system with a _PSC method for the fan that always returns "on". There's no benefit in us always requesting the state of the fan when performing transitions - we want to do everything we can to ensure that the fan turns on when it should do, not risk hardware damage by believing the hardware when it tells us the fan is already on. Given that the Leading Other OS(tm) works fine on this machine, it seems likely that it behaves in much this way. inspired-by: Matthew Garrett Signed-off-by: Zhang Rui Signed-off-by: Len Brown --- drivers/acpi/bus.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) (limited to 'drivers/acpi/bus.c') diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c index cf761b904e4a..ae9226de93a6 100644 --- a/drivers/acpi/bus.c +++ b/drivers/acpi/bus.c @@ -190,16 +190,16 @@ int acpi_bus_get_power(acpi_handle handle, int *state) * Get the device's power state either directly (via _PSC) or * indirectly (via power resources). */ - if (device->power.flags.explicit_get) { + if (device->power.flags.power_resources) { + result = acpi_power_get_inferred_state(device); + if (result) + return result; + } else if (device->power.flags.explicit_get) { status = acpi_evaluate_integer(device->handle, "_PSC", NULL, &psc); if (ACPI_FAILURE(status)) return -ENODEV; device->power.state = (int)psc; - } else if (device->power.flags.power_resources) { - result = acpi_power_get_inferred_state(device); - if (result) - return result; } *state = device->power.state; -- cgit v1.2.1 From 6a4e2b7503d1f630bface040cf0f5a7aac1fabdb Mon Sep 17 00:00:00 2001 From: Zhao Yakui Date: Fri, 8 Jan 2010 21:29:58 +0800 Subject: ACPI: Advertise to BIOS in _OSC: _OST on _PPC changes If the BIOS pokes the system-wide OSC bits to see if Linux supports evaluating _OST after a _PPC change notification, answer yes. Also, fix an oversight where we neglected to set the OSC bit advertising processor aggregator device support when acpi-pad is compiled as a module. Signed-off-by: Zhao Yakui Signed-off-by: Len Brown --- drivers/acpi/bus.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) (limited to 'drivers/acpi/bus.c') diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c index cf761b904e4a..a52126e46307 100644 --- a/drivers/acpi/bus.c +++ b/drivers/acpi/bus.c @@ -490,9 +490,14 @@ static void acpi_bus_osc_support(void) capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE; capbuf[OSC_SUPPORT_TYPE] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */ -#ifdef CONFIG_ACPI_PROCESSOR_AGGREGATOR +#if defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR) ||\ + defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR_MODULE) capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PAD_SUPPORT; #endif + +#if defined(CONFIG_ACPI_PROCESSOR) || defined(CONFIG_ACPI_PROCESSOR_MODULE) + capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PPC_OST_SUPPORT; +#endif if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle))) return; if (ACPI_SUCCESS(acpi_run_osc(handle, &context))) -- cgit v1.2.1