提交 ccbf6b64 编写于 作者: J Jani Nikula

drm/i915/opregion: try to validate RVDA VBT only if it's there

Seems more sensible this way, and reduces indent for the more common
case.
Reviewed-by: NBob Paauwe <bob.j.paauwe@intel.com>
Signed-off-by: NJani Nikula <jani.nikula@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1490783578-6065-2-git-send-email-jani.nikula@intel.com
上级 0e53f472
......@@ -920,8 +920,8 @@ int intel_opregion_setup(struct drm_i915_private *dev_priv)
char buf[sizeof(OPREGION_SIGNATURE)];
int err = 0;
void *base;
const void *vbt = NULL;
u32 vbt_size = 0;
const void *vbt;
u32 vbt_size;
BUILD_BUG_ON(sizeof(struct opregion_header) != 0x100);
BUILD_BUG_ON(sizeof(struct opregion_acpi) != 0x100);
......@@ -984,30 +984,29 @@ int intel_opregion_setup(struct drm_i915_private *dev_priv)
MEMREMAP_WB);
vbt = opregion->rvda;
vbt_size = opregion->asle->rvds;
if (intel_bios_is_valid_vbt(vbt, vbt_size)) {
DRM_DEBUG_KMS("Found valid VBT in ACPI OpRegion (RVDA)\n");
opregion->vbt = vbt;
opregion->vbt_size = vbt_size;
goto out;
}
}
vbt = base + OPREGION_VBT_OFFSET;
/*
* The VBT specification says that if the ASLE ext mailbox is not used
* its area is reserved, but on some CHT boards the VBT extends into the
* ASLE ext area. Allow this even though it is against the spec, so we
* do not end up rejecting the VBT on those boards (and end up not
* finding the LCD panel because of this).
*/
vbt_size = (mboxes & MBOX_ASLE_EXT) ?
OPREGION_ASLE_EXT_OFFSET : OPREGION_SIZE;
vbt_size -= OPREGION_VBT_OFFSET;
if (intel_bios_is_valid_vbt(vbt, vbt_size)) {
DRM_DEBUG_KMS("Found valid VBT in ACPI OpRegion (RVDA)\n");
DRM_DEBUG_KMS("Found valid VBT in ACPI OpRegion (Mailbox #4)\n");
opregion->vbt = vbt;
opregion->vbt_size = vbt_size;
} else {
vbt = base + OPREGION_VBT_OFFSET;
/*
* The VBT specification says that if the ASLE ext mailbox is
* not used its area is reserved, but on some CHT boards the VBT
* extends into the ASLE ext area. Allow this even though it is
* against the spec, so we do not end up rejecting the VBT on
* those boards (and end up not finding the LCD panel because of
* this).
*/
vbt_size = (mboxes & MBOX_ASLE_EXT) ?
OPREGION_ASLE_EXT_OFFSET : OPREGION_SIZE;
vbt_size -= OPREGION_VBT_OFFSET;
if (intel_bios_is_valid_vbt(vbt, vbt_size)) {
DRM_DEBUG_KMS("Found valid VBT in ACPI OpRegion (Mailbox #4)\n");
opregion->vbt = vbt;
opregion->vbt_size = vbt_size;
}
}
out:
......
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