From: Paulo Zanoni <paulo.r.zanoni@intel.com>
Date: Fri, 4 Jul 2014 14:50:29 +0000 (-0300)
Subject: drm/i915: don't write powered down IRQ registers on Gen 8
X-Git-Tag: omap-for-v3.17/fixes-against-rc2~125^2~20^2~29
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=813bde438c575e2c84eed9702143d915702847e3;p=pandora-kernel.git

drm/i915: don't write powered down IRQ registers on Gen 8

If we enable unclaimed register reporting on Gen 8, we will discover
that the IRQ registers for pipes B and C are also on the power well,
so writes to them when the power well is disabled result in unclaimed
register errors.

Also, hsw_power_well_post_enable() already takes care of re-enabling
them once the power well is enabled.

Testcase: igt/pm_rpm/rte
Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
---

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