Merge branch 'linus' into locking/core, to pick up fixes

Signed-off-by: Ingo Molnar <mingo@kernel.org>

1 files changed, 33 insertions, 5 deletions

diff --git a/drivers/gpu/drm/i915/intel_opregion.c b/drivers/gpu/drm/i915/intel_opregion.c
index b8f106d9ecf8..3ac20153705a 100644
--- a/drivers/gpu/drm/i915/intel_opregion.c
+++ b/drivers/gpu/drm/i915/intel_opregion.c
@@ -55,7 +55,12 @@
 struct opregion_header {
 	u8 signature[16];
 	u32 size;
-	u32 opregion_ver;
+	struct {
+		u8 rsvd;
+		u8 revision;
+		u8 minor;
+		u8 major;
+	}  __packed over;
 	u8 bios_ver[32];
 	u8 vbios_ver[16];
 	u8 driver_ver[16];
@@ -119,7 +124,8 @@ struct opregion_asle {
 	u64 fdss;
 	u32 fdsp;
 	u32 stat;
-	u64 rvda;	/* Physical address of raw vbt data */
+	u64 rvda;	/* Physical (2.0) or relative from opregion (2.1+)
+			 * address of raw VBT data. */
 	u32 rvds;	/* Size of raw vbt data */
 	u8 rsvd[58];
 } __packed;
@@ -925,6 +931,11 @@ int intel_opregion_setup(struct drm_i915_private *dev_priv)
 	opregion->header = base;
 	opregion->lid_state = base + ACPI_CLID;
 
+	DRM_DEBUG_DRIVER("ACPI OpRegion version %u.%u.%u\n",
+			 opregion->header->over.major,
+			 opregion->header->over.minor,
+			 opregion->header->over.revision);
+
 	mboxes = opregion->header->mboxes;
 	if (mboxes & MBOX_ACPI) {
 		DRM_DEBUG_DRIVER("Public ACPI methods supported\n");
@@ -953,11 +964,26 @@ int intel_opregion_setup(struct drm_i915_private *dev_priv)
 	if (dmi_check_system(intel_no_opregion_vbt))
 		goto out;
 
-	if (opregion->header->opregion_ver >= 2 && opregion->asle &&
+	if (opregion->header->over.major >= 2 && opregion->asle &&
 	    opregion->asle->rvda && opregion->asle->rvds) {
-		opregion->rvda = memremap(opregion->asle->rvda,
-					  opregion->asle->rvds,
+		resource_size_t rvda = opregion->asle->rvda;
+
+		/*
+		 * opregion 2.0: rvda is the physical VBT address.
+		 *
+		 * opregion 2.1+: rvda is unsigned, relative offset from
+		 * opregion base, and should never point within opregion.
+		 */
+		if (opregion->header->over.major > 2 ||
+		    opregion->header->over.minor >= 1) {
+			WARN_ON(rvda < OPREGION_SIZE);
+
+			rvda += asls;
+		}
+
+		opregion->rvda = memremap(rvda, opregion->asle->rvds,
 					  MEMREMAP_WB);
+
 		vbt = opregion->rvda;
 		vbt_size = opregion->asle->rvds;
 		if (intel_bios_is_valid_vbt(vbt, vbt_size)) {
@@ -967,6 +993,8 @@ int intel_opregion_setup(struct drm_i915_private *dev_priv)
 			goto out;
 		} else {
 			DRM_DEBUG_KMS("Invalid VBT in ACPI OpRegion (RVDA)\n");
+			memunmap(opregion->rvda);
+			opregion->rvda = NULL;
 		}
 	}