Hi,
On 06-02-17 08:04, Jani Nikula wrote:
On Sun, 25 Dec 2016, Hans de Goede <hdego...@redhat.com> wrote:
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.
Cc: sta...@vger.kernel.org
Signed-off-by: Hans de Goede <hdego...@redhat.com>
---
Note even with this fixed the panel still does not work with 4.9,
but it does with drm-intel-next-queued :) I believe the missing bit in
4.9 is the "drm/915: Parsing the missed out DTD fields from the VBT"
commit, but I've not verified this.
---
drivers/gpu/drm/i915/intel_opregion.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/intel_opregion.c
b/drivers/gpu/drm/i915/intel_opregion.c
index f4429f6..eff35ae 100644
--- a/drivers/gpu/drm/i915/intel_opregion.c
+++ b/drivers/gpu/drm/i915/intel_opregion.c
@@ -982,7 +982,9 @@ int intel_opregion_setup(struct drm_i915_private *dev_priv)
opregion->vbt_size = vbt_size;
} else {
vbt = base + OPREGION_VBT_OFFSET;
- vbt_size = OPREGION_ASLE_EXT_OFFSET -
OPREGION_VBT_OFFSET;
+ vbt_size = (mboxes & MBOX_ASLE_EXT) ?
+ OPREGION_ASLE_EXT_OFFSET : OPREGION_SIZE;
+ vbt_size -= OPREGION_VBT_OFFSET;
First, I want a big fat warning comment about what's going on
here. Otherwise someone's bound to "fix" this later on.
Done for v2, which I will send shortly.
Second, per the spec, the ASLE ext mailbox is 1k in size, and there's a
1k reserved region at the end. We probably shouldn't allow VBT to extend
over there. But hey, per the spec we also shouldn't allow VBT to extend
over mailbox #5 either. So if you can't be bothered with that, neither
will I.
Hmm, that makes no sense, OPREGION_SIZE is 8192 bytes or 0x2000,
OPREGION_ASLE_EXT_OFFSET is 0x1C00 or 7168 bytes, if there is 1k
reserved after the ASLE ext mailbox then there is exactly 0 bytes
available for the ASLE ext mailbox or OPREGION_SIZE should be 9216
not 8192 (which I don't think so). Maybe the last 1k is either
the ASLE ext mailbox OR reserved ?
Anyways leaving this bit as is for now.
Regards,
Hans
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