linux-kernel - [PATCH 4.11 13/13] drm/i915: Disable decoupled MMIO

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Message-Id: <20170615175426.707438318@linuxfoundation.org>
Date:   Thu, 15 Jun 2017 19:54:47 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Zhe Wang <zhe1.wang@...el.com>,
        Praveen Paneri <praveen.paneri@...el.com>,
        Tvrtko Ursulin <tvrtko.ursulin@...el.com>,
        Daniel Vetter <daniel.vetter@...el.com>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        intel-gfx@...ts.freedesktop.org, Kai Chen <kai.chen@...el.com>,
        Jani Nikula <jani.nikula@...el.com>
Subject: [PATCH 4.11 13/13] drm/i915: Disable decoupled MMIO

4.11-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Kai Chen <kai.chen@...el.com>

commit 4c4c565513cca1c53a12956640b5915727431631 upstream.

The decoupled MMIO feature doesn't work as intended by HW team. Enabling
it with forcewake will only make debugging efforts more difficult, so
let's disable it.

Fixes: 85ee17ebeedd ("drm/i915/bxt: Broxton decoupled MMIO")
Cc: Zhe Wang <zhe1.wang@...el.com>
Cc: Praveen Paneri <praveen.paneri@...el.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@...el.com>
Cc: Daniel Vetter <daniel.vetter@...el.com>
Cc: Jani Nikula <jani.nikula@...ux.intel.com>
Cc: intel-gfx@...ts.freedesktop.org
Signed-off-by: Kai Chen <kai.chen@...el.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@...el.com>
Signed-off-by: Jani Nikula <jani.nikula@...el.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170523215812.18328-2-kai.chen@intel.com
(cherry picked from commit 0051c10acabb631cfd439eae73289e6e4c39b2b7)
Signed-off-by: Jani Nikula <jani.nikula@...el.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/gpu/drm/i915/i915_pci.c |    1 -
 1 file changed, 1 deletion(-)

--- a/drivers/gpu/drm/i915/i915_pci.c
+++ b/drivers/gpu/drm/i915/i915_pci.c
@@ -389,7 +389,6 @@ static const struct intel_device_info in
 	.has_hw_contexts = 1, \
 	.has_logical_ring_contexts = 1, \
 	.has_guc = 1, \
-	.has_decoupled_mmio = 1, \
 	.has_aliasing_ppgtt = 1, \
 	.has_full_ppgtt = 1, \
 	.has_full_48bit_ppgtt = 1, \