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drm/i915: Never fully mask the the EI up rps interrupt on SNB/IVB

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SNB (and IVB too I suppose) starts to misbehave if the GPU gets stuck
in an infinite batch buffer loop. The GPU apparently hogs something
critical and CPUs start to lose interrupts and whatnot. We can keep
the system limping along by unmasking some interrupts in
GEN6_PMINTRMSK. The EI up interrupt has been previously chosen for
that task, so let's never mask it.

v2: s/gen6_rps_pm_mask/gen6_sanitize_rps_pm_mask/ (Chris)

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=93122
Signed-off-by: Ville Syrjälä <[email protected]>
Reviewed-by: Chris Wilson <[email protected]>
Signed-off-by: Chris Wilson <[email protected]>
Link: http://patchwork.freedesktop.org/patch/msgid/[email protected]
Cc: [email protected]
(cherry picked from commit 12c100bfa5)
Signed-off-by: Daniel Vetter <[email protected]>
This commit is contained in:
Ville Syrjälä 2016-05-23 17:42:48 +03:00 • committed by Daniel Vetter
commit a7b4667a00
1 changed files with 2 additions and 1 deletions
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3
drivers/gpu/drm/i915/intel_pm.c
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@ -4892,7 +4892,8 @@ void gen6_rps_idle(struct drm_i915_private *dev_priv)
else
gen6_set_rps(dev_priv, dev_priv->rps.idle_freq);
dev_priv->rps.last_adj = 0;
I915_WRITE(GEN6_PMINTRMSK, 0xffffffff);
I915_WRITE(GEN6_PMINTRMSK,
gen6_sanitize_rps_pm_mask(dev_priv, ~0));
}
mutex_unlock(&dev_priv->rps.hw_lock);