linux-kernel - [PATCH] drm/i915/vlv: Prevent enabling hpd polling in late suspend

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Date:   Wed, 26 Oct 2016 12:36:09 -0400
From:   Lyude <lyude@...hat.com>
To:     intel-gfx@...ts.freedesktop.org
Cc:     Lyude <lyude@...hat.com>,
        Ville Syrjälä 
        <ville.syrjala@...ux.intel.com>,
        Jani Saarinen <jani.saarinen@...el.com>,
        Petry Latvala <petri.latvala@...el.com>,
        Daniel Vetter <daniel.vetter@...el.com>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        David Airlie <airlied@...ux.ie>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: [PATCH] drm/i915/vlv: Prevent enabling hpd polling in late suspend

One of the CI machines began to run into issues with the hpd poller
suddenly waking up in the midst of the late suspend phase. It looks like
this is getting caused by the fact we now deinitialize power wells in
late suspend, which means that intel_hpd_poll_init() gets called in late
suspend causing polling to get re-enabled. So, when deinitializing power
wells on valleyview we now refrain from enabling polling in the midst of
suspend.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=98040
Fixes: 19625e85c6ec ("drm/i915: Enable polling when we don't have hpd")
Signed-off-by: Lyude <lyude@...hat.com>
Cc: Ville Syrjälä <ville.syrjala@...ux.intel.com>
Cc: Jani Saarinen <jani.saarinen@...el.com>
Cc: Petry Latvala <petri.latvala@...el.com>
---
 drivers/gpu/drm/i915/intel_runtime_pm.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/intel_runtime_pm.c b/drivers/gpu/drm/i915/intel_runtime_pm.c
index 82edba2..ac85482 100644
--- a/drivers/gpu/drm/i915/intel_runtime_pm.c
+++ b/drivers/gpu/drm/i915/intel_runtime_pm.c
@@ -1138,7 +1138,9 @@ static void vlv_display_power_well_deinit(struct drm_i915_private *dev_priv)
 
 	intel_power_sequencer_reset(dev_priv);
 
-	intel_hpd_poll_init(dev_priv);
+	/* Prevent us from re-enabling polling on accident in late suspend */
+	if (!dev_priv->drm.dev->power.is_suspended)
+		intel_hpd_poll_init(dev_priv);
 }
 
 static void vlv_display_power_well_enable(struct drm_i915_private *dev_priv,
-- 
2.7.4