linux-kernel - [PATCH v3] drm/i915: Honor SSC quirk table over the default, unless set by user

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Date:	Wed, 09 Nov 2011 17:12:56 +0100
From:	Michel Alexandre Salim <salimma@...oraproject.org>
To:	intel-gfx@...ts.freedesktop.org
Cc:	Keith Packard <keithp@...thp.com>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Chris Wilson <chris@...is-wilson.co.uk>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: [PATCH v3] drm/i915: Honor SSC quirk table over the default, unless
 set by user

>From a90bf9ac2a40869242a79c88958c99dacc3da2a9 Mon Sep 17 00:00:00 2001
From: Michel Alexandre Salim <salimma@...oraproject.org>
Date: Wed, 9 Nov 2011 14:18:45 +0100
Subject: [PATCH v3] drm/i915: Honor SSC quirk table over the default, unless set by user

Commit 72bbe58cd9568c7766cc219a779ea68a02132797 makes the check against
the quirk table unreachable if i915_panel_use_ssc is automatically set
to a non-zero value. This patch changes the tests so that unless
i915_panel_use_ssc is set to exactly 1, the quirk table is checked.

This ensures that on known quirky hardware, SSC is disabled unless
specifically enabled by the user.

Signed-off-by: Michel Alexandre Salim <salimma@...oraproject.org>
---
 drivers/gpu/drm/i915/intel_display.c |    7 +++++--
 1 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 981b1f1..aa7b0c8 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -4660,10 +4660,13 @@ static void intel_update_watermarks(struct drm_device *dev)
 
 static inline bool intel_panel_use_ssc(struct drm_i915_private *dev_priv)
 {
+	if (i915_panel_use_ssc == 1)
+		return true;
+	if (dev_priv->quirks & QUIRK_LVDS_SSC_DISABLE)
+		return false;
 	if (i915_panel_use_ssc >= 0)
 		return i915_panel_use_ssc != 0;
-	return dev_priv->lvds_use_ssc
-		&& !(dev_priv->quirks & QUIRK_LVDS_SSC_DISABLE);
+	return dev_priv->lvds_use_ssc;
 }
 
 /**
-- 
1.7.7



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