Patch "drm/i915: Fix not finding the VBT when it overlaps with OPREGION_ASLE_EXT" has been added to the 4.10-stable tree
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This is a note to let you know that I've just added the patch titled
drm/i915: Fix not finding the VBT when it overlaps with OPREGION_ASLE_EXT
to the 4.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-i915-fix-not-finding-the-vbt-when-it-overlaps-with-opregion_asle_ext.patch
and it can be found in the queue-4.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.
Quoted 1 line
From
998d75730b40afc218c059d811869abe9676b305Mon Sep 17 00:00:00 2001
From: Hans de Goede <[email protected]>
Date: Tue, 14 Feb 2017 18:12:38 +0200
Subject: drm/i915: Fix not finding the VBT when it overlaps with OPREGION_ASLE_EXT
From: Hans de Goede <[email protected]>
commit 998d75730b40afc218c059d811869abe9676b305 upstream.
If there is no OPREGION_ASLE_EXT then a VBT stored in mailbox #4 may use the ASLE_EXT parts of the opregion. Adjust the vbt_size calculation for a vbt in mailbox #4 for this.
This fixes the driver not finding the VBT on a jumper ezpad mini3 cherrytrail tablet and on a ACER SW5_017 machine.
--- drivers/gpu/drm/i915/intel_opregion.c | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-)
drivers/gpu/drm/i915/intel_opregion.c +12 -1
@@ -982,7 +982,18 @@ int intel_opregion_setup(struct drm_i915 opregion->vbt_size = vbt_size; }else { vbt = base +OPREGION_VBT_OFFSET ; - vbt_size =OPREGION_ASLE_EXT_OFFSET -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;
Patches currently in stable-queue which might be from [email protected] are
queue-4.10/drm-i915-fix-not-finding-the-vbt-when-it-overlaps-with-opregion_asle_ext.patch