[Intel-gfx] [PATCH 26/28] drm/i915/tgl: skip setting PORT_CL_DW12_* on initialization

[Lucas De Marchi]

According to the spec when initializing the display in TGL we should not
set PORT_CL_DW12 for the Aux channel of the combo PHYs. We will re-use the
power well hooks from ICL so just check for IS_TIGERLAKE() inside it.

Cc: Imre Deak <imre.d...@intel.com>
Signed-off-by: Lucas De Marchi <lucas.demar...@intel.com>
---
 drivers/gpu/drm/i915/display/intel_display_power.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_display_power.c 
b/drivers/gpu/drm/i915/display/intel_display_power.c
index fb0706f92b29..a8d3b0541edb 100644
--- a/drivers/gpu/drm/i915/display/intel_display_power.c
+++ b/drivers/gpu/drm/i915/display/intel_display_power.c
@@ -451,8 +451,10 @@ icl_combo_phy_aux_power_well_enable(struct 
drm_i915_private *dev_priv,
        val = I915_READ(regs->driver);
        I915_WRITE(regs->driver, val | HSW_PWR_WELL_CTL_REQ(pw_idx));
 
-       val = I915_READ(ICL_PORT_CL_DW12(port));
-       I915_WRITE(ICL_PORT_CL_DW12(port), val | ICL_LANE_ENABLE_AUX);
+       if (!IS_TIGERLAKE(dev_priv)) {
+               val = I915_READ(ICL_PORT_CL_DW12(port));
+               I915_WRITE(ICL_PORT_CL_DW12(port), val | ICL_LANE_ENABLE_AUX);
+       }
 
        hsw_wait_for_power_well_enable(dev_priv, power_well);
 
@@ -479,8 +481,10 @@ icl_combo_phy_aux_power_well_disable(struct 
drm_i915_private *dev_priv,
        enum port port = ICL_AUX_PW_TO_PORT(pw_idx);
        u32 val;
 
-       val = I915_READ(ICL_PORT_CL_DW12(port));
-       I915_WRITE(ICL_PORT_CL_DW12(port), val & ~ICL_LANE_ENABLE_AUX);
+       if (!IS_TIGERLAKE(dev_priv)) {
+               val = I915_READ(ICL_PORT_CL_DW12(port));
+               I915_WRITE(ICL_PORT_CL_DW12(port), val & ~ICL_LANE_ENABLE_AUX);
+       }
 
        val = I915_READ(regs->driver);
        I915_WRITE(regs->driver, val & ~HSW_PWR_WELL_CTL_REQ(pw_idx));
-- 
2.21.0

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