From: Daniel Vetter <daniel@ffwll.ch>
To: Intel Graphics Development <intel-gfx@lists.freedesktop.org>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Subject: Re: [PATCH] drm/i915: Fixup hpd irq register setup ordering
Date: Sun, 9 Dec 2012 20:17:54 +0100 [thread overview]
Message-ID: <20121209191754.GG11556@phenom.ffwll.local> (raw)
In-Reply-To: <1355080498-3870-1-git-send-email-daniel.vetter@ffwll.ch>
On Sun, Dec 09, 2012 at 08:14:58PM +0100, Daniel Vetter wrote:
> For GMCH platforms we set up the hpd irq registers in the irq
> postinstall hook. But since we only enable the irq sources we actually
> need in PORT_HOTPLUG_EN/STATUS, taking dev_priv->hotplug_supported_mask
> into account, no hpd interrupt sources is enabled since
>
> commit 52d7ecedac3f96fb562cb482c139015372728638
> Author: Daniel Vetter <daniel.vetter@ffwll.ch>
> Date: Sat Dec 1 21:03:22 2012 +0100
>
> drm/i915: reorder setup sequence to have irqs for output setup
>
> Wrongly set-up interrupts also lead broken hw-based load-detection on
> at least GM45, resulting in ghost VGA/TV-out outputs.
>
> To fix this, delay the hotplug register setup until after all outputs
> are set up, by moving it into a new dev_priv->display.hpd_irq_callback.
> We might also move the PCH_SPLIT platforms to such a setup eventually.
>
> Another funny part is that we need to delay the fbdev initial config
> probing until after the hpd regs are setup, for otherwise it'll detect
> ghost outputs. But we can only enable the hpd interrupt handling
> itself (and the output polling) _after_ that initial scan, due to
> massive locking brain-damage in the fbdev setup code. Add a big
> comment to explain this cute little dragon lair.
>
> Reported-by: Chris Wilson <chris@chris-wilson.co.uk>
> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=54943
--
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch
next prev parent reply other threads:[~2012-12-09 19:16 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-12-09 19:14 [PATCH] drm/i915: Fixup hpd irq register setup ordering Daniel Vetter
2012-12-09 19:17 ` Daniel Vetter [this message]
2012-12-09 19:42 ` Daniel Vetter
2012-12-10 13:40 ` Chris Wilson
2012-12-10 21:01 ` Jesse Barnes
2012-12-10 21:55 ` Daniel Vetter
2012-12-11 13:05 ` Daniel Vetter
2012-12-11 15:58 ` Imre Deak
2012-12-11 16:24 ` Daniel Vetter
2012-12-11 12:06 ` Daniel Vetter
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