[Intel-gfx] [PATCH v4 21/22] drm/i915/mtl: TypeC HPD live status query

[Mika Kahola]

From: Imre Deak <imre.deak at intel.com>

The HPD live status for MTL has to be read from different set of
registers. MTL deserves a new function for this purpose
and cannot reuse the existing  HPD live status detection

Signed-off-by: Anusha Srivatsa <anusha.srivatsa at intel.com>
Signed-off-by: Imre Deak <imre.deak at intel.com>
Signed-off-by: Mika Kahola <mika.kahola at intel.com>
---
 drivers/gpu/drm/i915/display/intel_tc.c | 30 +++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_tc.c b/drivers/gpu/drm/i915/display/intel_tc.c
index 89dfc19de1b8..5756daac91d9 100644
--- a/drivers/gpu/drm/i915/display/intel_tc.c
+++ b/drivers/gpu/drm/i915/display/intel_tc.c
@@ -297,10 +297,40 @@ static u32 adl_tc_port_live_status_mask(struct intel_digital_port *dig_port)
 	return mask;
 }
 
+static u32 xelpdp_tc_port_live_status_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);
+	u32 isr_bit = i915->display.hotplug.pch_hpd[dig_port->base.hpd_pin];
+	struct intel_uncore *uncore = &i915->uncore;
+	u32 val, mask = 0;
+	enum hpd_pin pin;
+
+	val = intel_uncore_read(uncore, PICAINTERRUPT_ISR);
+	pin = HPD_PORT_TC1 + tc_port - TC_PORT_1;
+	if (val & XELPDP_DP_ALT_HOTPLUG(pin))
+		mask |= BIT(TC_PORT_DP_ALT);
+	if (val & XELPDP_TBT_HOTPLUG(pin))
+		mask |= BIT(TC_PORT_TBT_ALT);
+
+	if (dig_port->tc_legacy_port &&
+	    intel_uncore_read(uncore, SDEISR) & isr_bit)
+		mask |= BIT(TC_PORT_LEGACY);
+
+	/* The sink can be connected only in a single mode. */
+	if (!drm_WARN_ON(&i915->drm, hweight32(mask) > 1))
+		tc_port_fixup_legacy_flag(dig_port, mask);
+
+	return mask;
+}
+
 static u32 tc_port_live_status_mask(struct intel_digital_port *dig_port)
 {
 	struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
 
+	if (DISPLAY_VER(i915) >= 14)
+		return xelpdp_tc_port_live_status_mask(dig_port);
+
 	if (DISPLAY_VER(i915) >= 13)
 		return adl_tc_port_live_status_mask(dig_port);
 
-- 
2.34.1