intel_idle: prevent SKL-H boot failure when C8+C9+C10 enabled

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commit d70e28f57e upstream.

Some SKL-H configurations require "intel_idle.max_cstate=7" to boot.
While that is an effective workaround, it disables C10.

This patch detects the problematic configuration,
and disables C8 and C9, keeping C10 enabled.

Note that enabling SGX in BIOS SETUP can also prevent this issue,
if the system BIOS provides that option.

https://bugzilla.kernel.org/show_bug.cgi?id=109081
"Freezes with Intel i7 6700HQ (Skylake), unless intel_idle.max_cstate=7"

Signed-off-by: Len Brown <len.brown@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Len Brown 2016-03-13 00:33:48 -05:00 • committed by Greg Kroah-Hartman

parent ded1db97ac

commit 79d05ce04b

1 changed files with 86 additions and 22 deletions

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drivers/idle/intel_idle.c

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