On Wed, 30 Nov 2011 03:42:00 +0000, Ben Widawsky <[email protected]> wrote: Non-text part: multipart/signed > On Tue, Nov 29, 2011 at 04:47:57PM -0800, Eric Anholt wrote: > > On Mon, 28 Nov 2011 18:48:04 -0800, "Keith Packard" <[email protected]> > > wrote: > > Non-text part: multipart/mixed > > Non-text part: multipart/signed > > > > > > Just reading through vol1c.4 of the bspec this evening and found > > > something odd. > > > > > > Bit 11 of MI_MODE is "Invalidate UHPTR enable". > > > Bit 12 of MI_MODE is "MI_FLUSH Enable" > > > > > > And, yet, in i915_reg.h: > > > > > > #define MI_MODE 0x0209c > > > # define VS_TIMER_DISPATCH (1 << 6) > > > # define MI_FLUSH_ENABLE (1 << 11) > > > > > > Are we off-by-one on MI_FLUSH_ENABLE? Seems like this would cause > > > serious problems... > > > > I think we are. On the other hand, based on actual behavior plus > > reading of simulator, I believe that the bit does nothing, regardless. > > I do not think so. We've (Chris, I, and perhaps Jesse?) been through > this excercise at least twice before, and both times resulted in hangs > when we switched to bit 12 on Ironlake, not sure about other platforms.
There is no MI_FLUSH enable bit on Ironlake in my copy of the docs. Bit 12 is MBZ on that hardware.
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