[PATCH 1/1] Use cachable mapping for i915 opregion.

Michael Karcher kernel at mkarcher.dialup.fu-berlin.de
Sun Jan 23 09:23:34 PST 2011

The opregion is a shared memory region between ACPI and the graphics
driver. As the ACPI mapping has been changed to cachable in commit
6d5bbf00d251cc73223a71422d69e069dc2e0b8d, mapping the intel opregion
non-cachable now fails. As no bus-master hardware is involved in the
opregion, cachable map should do no harm.

Tested on a Fujitsu Lifebook P8010.

Signed-off-by: Michael Karcher <kernel at mkarcher.dialup.fu-berlin.de>
 drivers/gpu/drm/i915/intel_opregion.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_opregion.c b/drivers/gpu/drm/i915/intel_opregion.c
index f295a7a..dfaccd5 100644
--- a/drivers/gpu/drm/i915/intel_opregion.c
+++ b/drivers/gpu/drm/i915/intel_opregion.c
@@ -476,7 +476,7 @@ int intel_opregion_setup(struct drm_device *dev)
 		return -ENOTSUPP;
-	base = ioremap(asls, OPREGION_SIZE);
+	base = ioremap_cache(asls, OPREGION_SIZE);
 	if (!base)
 		return -ENOMEM;

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