linux-kernel - [PATCH AUTOSEL for 4.4 20/28] drm/i915/bxt: Correct dual-link MIPI port control.

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Date:   Wed, 15 Nov 2017 02:46:03 +0000
From:   alexander.levin@...izon.com
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Cc:     Bob Paauwe <bob.j.paauwe@...el.com>,
        Ville Syrjälä <ville.syrjala@...ux.intel.com>,
        alexander.levin@...izon.com
Subject: [PATCH AUTOSEL for 4.4 20/28] drm/i915/bxt: Correct dual-link MIPI
 port control.

From: Bob Paauwe <bob.j.paauwe@...el.com>

[ Upstream commit 812b1d2fe527c3c68d04f379aef850dd02db5945 ]

For BXT, there is only one bit that enables/disables dual-link mode
and not different bits depending on which pipe is being used.

Signed-off-by: Bob Paauwe <bob.j.paauwe@...el.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1479767046-3964-1-git-send-email-bob.j.paauwe@intel.com
Signed-off-by: Ville Syrjälä <ville.syrjala@...ux.intel.com>
Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
---
 drivers/gpu/drm/i915/intel_dsi.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/intel_dsi.c b/drivers/gpu/drm/i915/intel_dsi.c
index 170ae6f4866e..93d6f43e4a59 100644
--- a/drivers/gpu/drm/i915/intel_dsi.c
+++ b/drivers/gpu/drm/i915/intel_dsi.c
@@ -400,7 +400,10 @@ static void intel_dsi_port_enable(struct intel_encoder *encoder)
 		if (intel_dsi->ports == ((1 << PORT_A) | (1 << PORT_C))) {
 			temp |= (intel_dsi->dual_link - 1)
 						<< DUAL_LINK_MODE_SHIFT;
-			temp |= intel_crtc->pipe ?
+			if (IS_BROXTON(dev_priv))
+				temp |= LANE_CONFIGURATION_DUAL_LINK_A;
+			else
+				temp |= intel_crtc->pipe ?
 					LANE_CONFIGURATION_DUAL_LINK_B :
 					LANE_CONFIGURATION_DUAL_LINK_A;
 		}
-- 
2.11.0