[PATCH 4/4] drm/i915: fix link rates reported for SKL

From: Sivakumar Thulasimani <sivakumar.thulasimani@intel.com>
To: ville.syrjala@linux.intel.com, jani.nikula@linux.intel.com,
	intel-gfx@lists.freedesktop.org
Subject: [PATCH 4/4] drm/i915: fix link rates reported for SKL
Date: Mon, 17 Aug 2015 17:45:11 +0530	[thread overview]
Message-ID: <1439813711-2438-5-git-send-email-sivakumar.thulasimani@intel.com> (raw)
In-Reply-To: <1439813711-2438-1-git-send-email-sivakumar.thulasimani@intel.com>

From: "Thulasimani,Sivakumar" <sivakumar.thulasimani@intel.com>

This patch fixes the bug that SKL SKUs before B0 might return
HBR2 as supported even though it is not supposed to be enabled
on such platforms.

Signed-off-by: Sivakumar Thulasimani <sivakumar.thulasimani@intel.com>
---
 drivers/gpu/drm/i915/intel_dp.c |   14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 03523b3..963fdae 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -1224,21 +1224,23 @@ static bool intel_dp_is_hbr2_supported(struct drm_device *dev)
 static int
 intel_dp_source_rates(struct drm_device *dev, const int **source_rates)
 {
+	int size = 0;
 	if (IS_BROXTON(dev)) {
 		*source_rates = bxt_rates;
-		return ARRAY_SIZE(bxt_rates);
+		size = ARRAY_SIZE(bxt_rates);
 	} else if (IS_SKYLAKE(dev)) {
 		*source_rates = skl_rates;
-		return ARRAY_SIZE(skl_rates);
+		size = ARRAY_SIZE(skl_rates);
+	} else {
+		*source_rates = default_rates;
+		size = ARRAY_SIZE(default_rates);
 	}
 
-	*source_rates = default_rates;
-
 	/* This depends on the fact that 5.4 is last value in the array */
 	if (intel_dp_is_hbr2_supported(dev))
-		return (DP_LINK_BW_5_4 >> 3) + 1;
+		return size;
 	else
-		return (DP_LINK_BW_2_7 >> 3) + 1;
+		return size - 1;
 }
 
 static void
-- 
1.7.9.5

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