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Zou Nan hai
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(cherry picked from c2bdb76814755c9ac6e66a8815f23af0fe4f3a91 commit)
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Handle relative as well as absolute target sequence numbers.
Return error if target sequence has already passed, so userspace can deal with
this situation as it sees fit.
On success, return the sequence number of the vertical blank when the buffer
swap is expected to take place.
Also add DRM_IOCTL_I915_VBLANK_SWAP definition for userspace code that may want
to use ioctl() instead of drmCommandWriteRead().
(cherry picked from d5a0f107511e128658e2d5e15bd7e6215c507f29 commit)
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This uses the core facility to schedule a driver callback that will be called
ASAP after the given vertical blank interrupt with the HW lock held.
(cherry picked from 257771fa290b62d4d2ad896843cf3a207978d0bb commit)
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In the intel case, we can associate a flush with a sequence.
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Disable the i915 IRQ turnoff for now since it seems to be causing problems.
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smack my whitespace up.
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This is a patch prepared by Guangdeng Liao based off of Tungsten Graphics's
final code drop.
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i915 vblanks can be generated from either pipe a or b, however a disabled
pipe generates no interrupts. This change allows the X server to select
which pipe generates vblank interrupts.
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(Tungsten Graphics)
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that particular file. Its contents have changed a good bit since the
original sis code, and the original sis code didn't care much about
attribution since it routinely disclaims Precision Insight/VA Linux
from responsibility. Also, adjust formatting around license headers
(have a comment open immediately before the "Copyright" line, not as a
runon of any previous comments) for automatic processing into FreeBSD,
where /*- is used to signal the beginning of license headers for
automatic compilation of license lists.
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