[PATCH] drm/i915: rip out the PM_IIR WARN, again

[Daniel Vetter <daniel.vetter@ffwll.ch>]

This has accidentally been reintroduced with

commit 22aae764a3fa21ee502b99e8986cb4e49ec14cfe
Author:     Ben Widawsky <ben@bwidawsk.net>
Date: Tue May 28 19:22:24 2013 -0700

    drm/i915: Create a more generic pm handler for hsw+

See

commit 58bf8062d0b293b8e1028e5b0342082002886bd4
Author: Daniel Vetter <daniel.vetter@ffwll.ch>
Date:   Thu Jun 21 14:55:22 2012 +0200

    drm/i915: rip out the PM_IIR WARN

for the extensive reasoning why the WARN is bogus.

Cc: Damien Lespiau <damien.lespiau@intel.com>
Cc: Ben Widawsky <ben@bwidawsk.net>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=65197
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
---
 drivers/gpu/drm/i915/i915_irq.c |    7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index da5c9ab..df85abc 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -934,11 +934,8 @@ static void hsw_pm_irq_handler(struct drm_i915_private *dev_priv,
 
 	spin_lock_irqsave(&dev_priv->rps.lock, flags);
 	dev_priv->rps.pm_iir |= pm_iir & GEN6_PM_DEFERRED_EVENTS;
-	if (dev_priv->rps.pm_iir) {
-		I915_WRITE(GEN6_PMIMR, dev_priv->rps.pm_iir);
-		/* never want to mask useful interrupts. (also posting read) */
-		WARN_ON(I915_READ_NOTRACE(GEN6_PMIMR) & ~GEN6_PM_DEFERRED_EVENTS);
-	}
+	I915_WRITE(GEN6_PMIMR, dev_priv->rps.pm_iir);
+	POSTING_READ(GEN6_PMIMR);
 	spin_unlock_irqrestore(&dev_priv->rps.lock, flags);
 
 	queue_work(dev_priv->wq, &dev_priv->rps.work);
-- 
1.7.10.4