From: Damien Lespiau <damien.lespiau@intel.com>
Date: Wed, 11 Feb 2015 17:43:24 +0000 (+0000)
Subject: drm/i915/skl: Implement WaDisableHBR2
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=8749be86a8f0c8a956d20f7d3c768ed6d1e356a1;p=linux-beck.git

drm/i915/skl: Implement WaDisableHBR2

v2: Use the recently introduced INTEL_REVID() and SKL_REVID defines
    (Nick Hoath)

Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Tested-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=89554
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
---

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 33d58773cfe5..ca60060710d2 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -134,7 +134,10 @@ intel_dp_max_link_bw(struct intel_dp *intel_dp)
 	case DP_LINK_BW_2_7:
 		break;
 	case DP_LINK_BW_5_4: /* 1.2 capable displays may advertise higher bw */
-		if (((IS_HASWELL(dev) && !IS_HSW_ULX(dev)) ||
+		if (IS_SKYLAKE(dev) && INTEL_REVID(dev) <= SKL_REVID_B0)
+			/* WaDisableHBR2:skl */
+			max_link_bw = DP_LINK_BW_2_7;
+		else if (((IS_HASWELL(dev) && !IS_HSW_ULX(dev)) ||
 		     INTEL_INFO(dev)->gen >= 8) &&
 		    intel_dp->dpcd[DP_DPCD_REV] >= 0x12)
 			max_link_bw = DP_LINK_BW_5_4;