[Intel-gfx] Ivybridge hang fixes respun
kenneth at whitecape.org
Wed Feb 8 21:53:48 CET 2012
These fix many GPU hangs for Eugeni, though not on my machine for some
Oddly, the register writes to UCGCTL2 and SQ_CHICKEN_MBCUNIT_CONFIG stick,
but the writes to L3_CHICKEN_MODE, L3CNTLREG1, and COMMON_SLICE_CHICKEN1
don't seem to take effect. Currently no theories why.
Manually writing these values with intel_reg_write /does/ fix the hangs
I'm fine with these going to -fixes. They seem to help some people, and
I highly doubt they'll make anything worse. It'd be nice to understand
why the register writes aren't sticking, though...
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