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ACPI: handle systems which asynchoronously enable ACPI mode 

Folklore suggested that such systems existed
in the pre-history of ACPI.

However, we removed the SCI_EN polling loop from
acpi_hw_set_mode() in b430acbd7c
because it delayed resume by 3 seconds on boxes
that refused to set SCI_EN.

Matthew removed the call to acpi_enable() from
the suspend resume path.

James found a modern system that still needs to be polled
upon boot.

So here we restore the workaround, except that we
put it in acpi_enable() rather than the low level
acpi_hw_set_mode().

https://bugzilla.kernel.org/show_bug.cgi?id=16271

Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Len Brown 2010-06-28 20:55:01 -04:00
parent 9341625307
commit 3d695839a1
1 changed files with 11 additions and 8 deletions
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19
drivers/acpi/acpica/evxfevnt.c
View File

@ -70,6 +70,7 @@ acpi_ev_get_gpe_device(struct acpi_gpe_xrupt_info *gpe_xrupt_info,
acpi_status acpi_enable(void)
{
acpi_status status;
int retry;
ACPI_FUNCTION_TRACE(acpi_enable);
@ -98,16 +99,18 @@ acpi_status acpi_enable(void)
/* Sanity check that transition succeeded */
if (acpi_hw_get_mode() != ACPI_SYS_MODE_ACPI) {
ACPI_ERROR((AE_INFO,
"Hardware did not enter ACPI mode"));
return_ACPI_STATUS(AE_NO_HARDWARE_RESPONSE);
for (retry = 0; retry < 30000; ++retry) {
if (acpi_hw_get_mode() == ACPI_SYS_MODE_ACPI) {
if (retry != 0)
ACPI_WARNING((AE_INFO,
"Platform took > %d00 usec to enter ACPI mode", retry));
return_ACPI_STATUS(AE_OK);
}
acpi_os_stall(100); /* 100 usec */
}
ACPI_DEBUG_PRINT((ACPI_DB_INIT,
"Transition to ACPI mode successful\n"));
return_ACPI_STATUS(AE_OK);
ACPI_ERROR((AE_INFO, "Hardware did not enter ACPI mode"));
return_ACPI_STATUS(AE_NO_HARDWARE_RESPONSE);
}
ACPI_EXPORT_SYMBOL(acpi_enable)