From: Len Brown <len.brown@intel.com>
Date: Tue, 29 Jun 2010 00:55:01 +0000 (-0400)
Subject: ACPI: handle systems which asynchoronously enable ACPI mode
X-Git-Tag: v2.6.35~38^2~5^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3d695839a135a9b3f24b0d7cfd9c4fde2eadd2c5;p=pandora-kernel.git

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 b430acbd7c4b919886fa7fd92eeb7a695f1940d3
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>
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