[Intel-gfx] [PATCH 2/4] drm/i915/tgl: TC helper function to return pin mapping

[José Roberto de Souza]

From: "Taylor, Clinton A" <clinton.a.taylor at intel.com>

Add a helper function to return pin map for use during dkl phy
DP_MODE settings, PORT_TX_DFLEXPA1 exist on ICL but we don't need it.

The user of this function will come in future TC patches.

Signed-off-by: Taylor, Clinton A <clinton.a.taylor at intel.com>
---
 drivers/gpu/drm/i915/display/intel_tc.c | 16 ++++++++++++++++
 drivers/gpu/drm/i915/display/intel_tc.h |  1 +
 drivers/gpu/drm/i915/i915_reg.h         |  5 +++++
 3 files changed, 22 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_tc.c b/drivers/gpu/drm/i915/display/intel_tc.c
index 85743a43bee2..3a7302e360cc 100644
--- a/drivers/gpu/drm/i915/display/intel_tc.c
+++ b/drivers/gpu/drm/i915/display/intel_tc.c
@@ -61,6 +61,22 @@ u32 intel_tc_port_get_lane_mask(struct intel_digital_port *dig_port)
 	       DP_LANE_ASSIGNMENT_SHIFT(tc_port);
 }
 
+u32 intel_tc_port_get_pin_assignment_mask(struct intel_digital_port *dig_port)
+{
+	struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
+	enum tc_port tc_port = intel_port_to_tc(i915, dig_port->base.port);
+	struct intel_uncore *uncore = &i915->uncore;
+	u32 pin_mask;
+
+	pin_mask = intel_uncore_read(uncore,
+				     PORT_TX_DFLEXPA1(dig_port->tc_phy_fia));
+
+	WARN_ON(pin_mask == 0xffffffff);
+
+	return (pin_mask & DP_PIN_ASSIGNMENT_MASK(tc_port)) >>
+	       DP_PIN_ASSIGNMENT_SHIFT(tc_port);
+}
+
 int intel_tc_port_fia_max_lane_count(struct intel_digital_port *dig_port)
 {
 	struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
diff --git a/drivers/gpu/drm/i915/display/intel_tc.h b/drivers/gpu/drm/i915/display/intel_tc.h
index 783d75531435..463f1b3c836f 100644
--- a/drivers/gpu/drm/i915/display/intel_tc.h
+++ b/drivers/gpu/drm/i915/display/intel_tc.h
@@ -13,6 +13,7 @@ struct intel_digital_port;
 
 bool intel_tc_port_connected(struct intel_digital_port *dig_port);
 u32 intel_tc_port_get_lane_mask(struct intel_digital_port *dig_port);
+u32 intel_tc_port_get_pin_assignment_mask(struct intel_digital_port *dig_port);
 int intel_tc_port_fia_max_lane_count(struct intel_digital_port *dig_port);
 void intel_tc_port_set_fia_lane_count(struct intel_digital_port *dig_port,
 				      int required_lanes);
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index bf37ecebc82f..16d5548adb84 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -11683,4 +11683,9 @@ enum skl_power_gate {
 #define PORT_TX_DFLEXDPCSSS(fia)		_MMIO_FIA((fia), 0x00894)
 #define   DP_PHY_MODE_STATUS_NOT_SAFE(tc_port)		(1 << (tc_port))
 
+#define PORT_TX_DFLEXPA1(fia)			_MMIO_FIA((fia), 0x00880)
+#define   DP_PIN_ASSIGNMENT_SHIFT(tc_port)		((tc_port) * 4)
+#define   DP_PIN_ASSIGNMENT_MASK(tc_port)		(0xf << ((tc_port) * 4))
+#define   DP_PIN_ASSIGNMENT(tc_port, x)	((x) << ((tc_port) * 4))
+
 #endif /* _I915_REG_H_ */
-- 
2.23.0