From 897623dde19cb32d85a4d05d513aec810f587af2 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ville=20Syrj=C3=A4l=C3=A4?= <ville.syrjala@linux.intel.com>
Date: Wed, 6 Oct 2021 23:49:37 +0300
Subject: drm/i915: Fix icl+ combo phy static lane power down setup
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Git-commit: ead3ea12e133416fbd800eedb2fb5d0faf2df431
Patch-mainline: v5.17-rc1
References: jsc#PED-1166 jsc#PED-1168 jsc#PED-1170 jsc#PED-1218 jsc#PED-1220 jsc#PED-1222 jsc#PED-1223 jsc#PED-1225

Our lane power down defines already include the necessary shift,
don't shift them a second time.

Fortunately we masked off the correct bits, so we accidentally
left all lanes powered up all the time.

Bits 8-11 where we end up writing our misdirected lane mask are
documented as MBZ, but looks like you can actually write there
so they're not read only bits. No idea what side effect the
bogus register write might have.

Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/4151
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211006204937.30774-17-ville.syrjala@linux.intel.com
Reviewed-by: Imre Deak <imre.deak@intel.com>
Acked-by: Patrik Jakobsson <pjakobsson@suse.de>
---
 drivers/gpu/drm/i915/display/intel_combo_phy.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/display/intel_combo_phy.c b/drivers/gpu/drm/i915/display/intel_combo_phy.c
index 634e8d449457..f628e0542933 100644
--- a/drivers/gpu/drm/i915/display/intel_combo_phy.c
+++ b/drivers/gpu/drm/i915/display/intel_combo_phy.c
@@ -301,7 +301,7 @@ void intel_combo_phy_power_up_lanes(struct drm_i915_private *dev_priv,
 
 	val = intel_de_read(dev_priv, ICL_PORT_CL_DW10(phy));
 	val &= ~PWR_DOWN_LN_MASK;
-	val |= lane_mask << PWR_DOWN_LN_SHIFT;
+	val |= lane_mask;
 	intel_de_write(dev_priv, ICL_PORT_CL_DW10(phy), val);
 }
 
-- 
2.38.1