[Intel-gfx] [PATCH v3 36/48] drm/i915/adl_p: Enable/disable loadgen sharing

[Matt Roper]

From: Mika Kahola <mika.kahola at intel.com>

Disable loadgen sharing for DP link rate 1.62 GHz and HDMI 5.94 GHz.
For all other modes, we can enable loadgen sharing feature.

BSpec: 55359

Cc: Imre Deak <imre.deak at intel.com>
Signed-off-by: Mika Kahola <mika.kahola at intel.com>
Signed-off-by: Clinton Taylor <Clinton.A.Taylor at intel.com>
Signed-off-by: Matt Roper <matthew.d.roper at intel.com>
---
 drivers/gpu/drm/i915/display/intel_ddi.c | 8 ++++++++
 drivers/gpu/drm/i915/i915_reg.h          | 1 +
 2 files changed, 9 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c
index bbfa5bcd4c63..6889be6b9e81 100644
--- a/drivers/gpu/drm/i915/display/intel_ddi.c
+++ b/drivers/gpu/drm/i915/display/intel_ddi.c
@@ -1470,6 +1470,14 @@ tgl_dkl_phy_ddi_vswing_sequence(struct intel_encoder *encoder,
 		val = intel_de_read(dev_priv, DKL_TX_DPCNTL2(tc_port));
 		val &= ~DKL_TX_DP20BITMODE;
 		intel_de_write(dev_priv, DKL_TX_DPCNTL2(tc_port), val);
+
+		if ((intel_crtc_has_dp_encoder(crtc_state) &&
+		    crtc_state->port_clock == 162000) ||
+		    (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_HDMI) &&
+		    crtc_state->port_clock == 594000))
+			val |= DKL_TX_LOADGEN_SHARING_PMD_DISABLE;
+		else
+			val &= ~DKL_TX_LOADGEN_SHARING_PMD_DISABLE;
 	}
 }
 
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 9a52711e3920..3afbea20bdd3 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -10893,6 +10893,7 @@ enum skl_power_gate {
 						     _DKL_TX_DPCNTL1)
 
 #define _DKL_TX_DPCNTL2				0x2C8
+#define  DKL_TX_LOADGEN_SHARING_PMD_DISABLE            REG_BIT(12)
 #define  DKL_TX_DP20BITMODE				(1 << 2)
 #define DKL_TX_DPCNTL2(tc_port) _MMIO(_PORT(tc_port, \
 						     _DKL_PHY1_BASE, \
-- 
2.25.4