Comment 23 for bug 1449401

$ git bisect good
d960a0bdfb6406d65c29cad4689d03c895fa5fcd is the first bad commit
commit d960a0bdfb6406d65c29cad4689d03c895fa5fcd
Author: Arun Siluvery <email address hidden>
Date: Thu Mar 26 14:49:27 2015 +0200

    drm/i915/bdw: Apply workarounds in render ring init function

    BugLink: http://bugs.launchpad.net/bugs/1374389

    For BDW workarounds are currently initialized in init_clock_gating() but
    they are lost during reset, suspend/resume etc; this patch moves the WAs
    that are part of register state context to render ring init fn otherwise
    default context ends up with incorrect values as they don't get initialized
    until init_clock_gating fn.

    v2: Add workarounds to golden render state
    This method has its own issues, first of all this is different for
    each gen and it is generated using a tool so adding new workaround
    and mainitaining them across gens is not a straightforward process.

    v3: Use LRIs to emit these workarounds (Ville)
    Instead of modifying the golden render state the same LRIs are
    emitted from within the driver.

    v4: Use abstract name when exporting gen specific routines (Chris)

    For: VIZ-4092
    Signed-off-by: Arun Siluvery <email address hidden>
    Reviewed-by: Ville Syrjälä <email address hidden>
    Signed-off-by: Daniel Vetter <email address hidden>
    (backported from commit 86d7f23842f1bce3ab5e8c8d0c676112bbc4c99b)
    Signed-off-by: Timo Aaltonen <email address hidden>

    Conflicts:
     drivers/gpu/drm/i915/intel_ringbuffer.c
    Signed-off-by: Brad Figg <email address hidden>

:040000 040000 dadeaa890a6bee2e5d2fbd3cc0490ca0019d334d 34647b04b44f8b912d13e41c990b2eface864642 M drivers