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drm/i915/opregion: rvda is relative from opregion base in opregion 2.1+ 

Starting from opregion version 2.1 (roughly corresponding to ICL+) the
RVDA field is relative from the beginning of opregion, not absolute
address.

Fix the error path while at it.

v2: Make relative vs. absolute conditional on the opregion version,
    bumped for the purpose. Turned out there are machines relying on
    absolute RVDA in the wild.

v3: Fix the version checks

Fixes: 04ebaadb9f ("drm/i915/opregion: handle VBT sizes bigger than 6 KB")
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Imre Deak <imre.deak@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190208184254.24123-2-jani.nikula@intel.com
This commit is contained in:
Jani Nikula 2019-02-08 20:42:53 +02:00
parent 98fdaaca95
commit a0f52c3d35
1 changed files with 21 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

24
drivers/gpu/drm/i915/intel_opregion.c
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@ -123,7 +123,8 @@ 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;
@ -964,9 +965,24 @@ int intel_opregion_setup(struct drm_i915_private *dev_priv)
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)) {
@ -976,6 +992,8 @@ 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;
}
}