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| author |   Alan Cox <alan@linux.intel.com> | 2011-11-29 22:27:45 +0000 |
|---|---|---|
| committer |   Dave Airlie <airlied@redhat.com> | 2011-12-06 09:55:41 +0000 |
| commit | aa0c45fdca0cff3d1ba06578a84c9bc7f29a0960 (patch) | |
| tree | ed2b380de5668f7b7d8ee87b8433ef2082924ef4 /drivers/gpu/drm/gma500/mid_bios.c | |
| parent | gma500: Be smarter about layout (diff) | |
| download | linux-dev-aa0c45fdca0cff3d1ba06578a84c9bc7f29a0960.tar.xz linux-dev-aa0c45fdca0cff3d1ba06578a84c9bc7f29a0960.zip | |
gma500: Fix oaktrail probing part 1
The Oaktrail platform does not use the GCT/VBT format that is used by the
Moorestowm (non PC legacy) equivalent device. It uses the BIOS tables which
means an opregion and the like.
The current code uses the wrong table which breaks things like the Fujitsu
q550 tablets. Fix the table usage as a first step.
The problem was found and diagnosed by Chia-I Wu
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Diffstat (limited to 'drivers/gpu/drm/gma500/mid_bios.c')
| -rw-r--r-- | drivers/gpu/drm/gma500/mid_bios.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/gpu/drm/gma500/mid_bios.c b/drivers/gpu/drm/gma500/mid_bios.c index 018ab469772e..128e6bb37568 100644 --- a/drivers/gpu/drm/gma500/mid_bios.c +++ b/drivers/gpu/drm/gma500/mid_bios.c @@ -142,6 +142,12 @@ static void mid_get_vbt_data(struct drm_psb_private *dev_priv) memcpy(vbt, vbt_virtual, sizeof(*vbt)); iounmap(vbt_virtual); /* Free virtual address space */ + /* No matching signature don't process the data */ + if (memcmp(vbt->signature, "$GCT", 4)) { + vbt->size = 0; + return; + } + dev_dbg(dev->dev, "GCT revision is %x\n", vbt->revision); switch (vbt->revision) { |