Re: i915_driver_irq_handler: irq 42: nobody cared

On Die, 2012-04-10 at 11:34 -0700, Jesse Barnes wrote:

On Tue, 10 Apr 2012 20:11:29 +0200 Jiri Slaby jslaby@suse.cz wrote:

...

On 04/10/2012 06:26 PM, Jesse Barnes wrote:

...

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?

I'm not sure I got it right. This doesn't help: --- a/drivers/gpu/drm/i915/i915_irq.c +++ b/drivers/gpu/drm/i915/i915_irq.c @@ -1416,6 +1416,17 @@ static irqreturn_t i915_driver_irq_handler(DRM_IRQ_ARGS) iir = new_iir; }

•   if (ret == IRQ_NONE) {
  

•           u32 hp = I915_READ(PORT_HOTPLUG_STAT);
  

•           if (hp) {
  

•                   I915_WRITE(PORT_HOTPLUG_STAT, hp);
  

•                   I915_READ(PORT_HOTPLUG_STAT);
  

•           }
  

•           if (printk_ratelimit())
  

•                   printk(KERN_DEBUG "%s: %.8x\n", __func__, hp);
  

•   }
  
    return ret;
  

}

Yeah that looks right, you still get 0x300?

You said 'If you write 0x3 back' above, but this code writes 0x300. Which is right?