linux-kernel - [PATCH 4.9 169/206] drm/i915: disable PSR by default on HSW/BDW

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Date:   Tue, 10 Jan 2017 14:37:32 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Rodrigo Vivi <rodrigo.vivi@...el.com>,
        Jim Bride <jim.bride@...ux.intel.com>,
        Paulo Zanoni <paulo.r.zanoni@...el.com>,
        Jani Nikula <jani.nikula@...el.com>
Subject: [PATCH 4.9 169/206] drm/i915: disable PSR by default on HSW/BDW

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

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

From: Paulo Zanoni <paulo.r.zanoni@...el.com>

commit 1c4672ce4eeaeaadeea8adabaad21262b7172607 upstream.

We've been ignoring the poor bugzilla reporters that say PSR causes
system lockups and all other sorts of problems. The earliest bug
report is from April, so I think we can use the "revert the offending
commit if no fixes are presented within 8 months" rule here.

Fixes: 9b58e352b463 ("drm/i915: Enable PSR by default on Haswell and Broadwell.")
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=97602
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=97515
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=96736
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=96704
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=96569
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=95176
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=94985
Cc: Rodrigo Vivi <rodrigo.vivi@...el.com>
Cc: Jim Bride <jim.bride@...ux.intel.com>
Signed-off-by: Paulo Zanoni <paulo.r.zanoni@...el.com>
Acked-by: Rodrigo Vivi <rodrigo.vivi@...el.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@...el.com>
Acked-by: Jani Nikula <jani.nikula@...el.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1481662664-18986-1-git-send-email-paulo.r.zanoni@intel.com
(cherry picked from commit 2ee7dc497e348eecbb82adbb1ea9e9a7e29fe921)
Signed-off-by: Jani Nikula <jani.nikula@...el.com>
Signed-off-by: Paulo Zanoni <paulo.r.zanoni@...el.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/gpu/drm/i915/intel_psr.c |   10 +++-------
 1 file changed, 3 insertions(+), 7 deletions(-)

After we merged this, we closed even more fd.o bugs...

--- a/drivers/gpu/drm/i915/intel_psr.c
+++ b/drivers/gpu/drm/i915/intel_psr.c
@@ -825,13 +825,9 @@ void intel_psr_init(struct drm_device *d
 	dev_priv->psr_mmio_base = IS_HASWELL(dev_priv) ?
 		HSW_EDP_PSR_BASE : BDW_EDP_PSR_BASE;
 
-	/* Per platform default */
-	if (i915.enable_psr == -1) {
-		if (IS_HASWELL(dev) || IS_BROADWELL(dev))
-			i915.enable_psr = 1;
-		else
-			i915.enable_psr = 0;
-	}
+	/* Per platform default: all disabled. */
+	if (i915.enable_psr == -1)
+		i915.enable_psr = 0;
 
 	/* Set link_standby x link_off defaults */
 	if (IS_HASWELL(dev) || IS_BROADWELL(dev))