On Tue, 10 Apr 2012 10:47:49 +0200 Jiri Slaby <jslaby@xxxxxxx> wrote: > On 04/09/2012 07:11 PM, Jesse Barnes wrote: > > On Fri, 30 Mar 2012 11:45:43 +0100 Chris Wilson > > <chris@xxxxxxxxxxxxxxxxxx> wrote: > > > >> On Fri, 30 Mar 2012 11:59:28 +0200, Jiri Slaby <jslaby@xxxxxxx> > >> wrote: > >>> I don't know what to dump more, because iir is obviously zero > >>> too. What other sources of interrupts are on the (G33) chip? > >> > >> IIR is the master interrupt, with chained secondary interrupt > >> statuses. If IIR is 0, the interrupt wasn't raised by the GPU. > > > > I've actually seen cases where one of the PIPE*STAT regs is stuck, > > and even if IIR is 0 we still get interrupts... Jiri can you verify > > the PIPE*STAT regs have bits set, maybe one or more we don't check > > for? > > Note that I already attached their contents... This is what is in them > (pipes 0 and 1): > [ 3572.968581] i915_driver_irq_handler: 0=00000000 1=00000000 > [ 3572.977472] i915_driver_irq_handler: 0=00000000 1=00000000 > [ 3576.224839] i915_driver_irq_handler: 0=00000000 1=00000000 > [ 3576.243558] i915_driver_irq_handler: 0=00000000 1=00000000 > [ 3576.384912] i915_driver_irq_handler: 0=00000000 1=00000000 > [ 3576.403462] i915_driver_irq_handler: 0=00000000 1=00000000 > [ 3577.464100] i915_driver_irq_handler: 0=00000000 1=00000000 > [ 3577.477383] i915_driver_irq_handler: 0=00000000 1=00000000 > [ 3577.829016] i915_driver_irq_handler: 0=00020000 1=00000000 > [ 3577.830093] i915_driver_irq_handler: 0=00020000 1=00000000 > > I.e. the handler is called when IIR=0 and both pipe stats are 0. Oh sorry missed the PIPE*STAT, I thought it was IMR or something, I should have read more closely. So port hotplug is always reporting that port C has a hotplug interrupt though... If you write 0x3 back to it does the interrupt stop? -- Jesse Barnes, Intel Open Source Technology Center
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