linux-kernel - Re: i915_driver_irq_handler: irq 42: nobody cared

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Date:	Tue, 10 Apr 2012 20:11:29 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	Jesse Barnes <jbarnes@...tuousgeek.org>
CC:	Chris Wilson <chris@...is-wilson.co.uk>,
	Jiri Slaby <jirislaby@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	dri-devel@...ts.freedesktop.org, daniel@...ll.ch
Subject: Re: i915_driver_irq_handler: irq 42: nobody cared

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;
 }

thanks,
-- 
js
suse labs


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