[Intel-gfx] [CI 3/3] drm/i915/icl: Handle hotplug interrupts for DP over TBT

[Paulo Zanoni]

From: Dhinakaran Pandiyan <dhinakaran.pandiyan at intel.com>

This patch enables hotplug interrupts for DP over TBT output on TC
ports. The TBT interrupts are enabled and handled irrespective of the
actual output type which could be DP Alternate, DP over TBT, native DP
or native HDMI.

Cc: Animesh Manna <animesh.manna at intel.com>
Cc: Paulo Zanoni <paulo.r.zanoni at intel.com>
Cc: Anusha Srivatsa <anusha.srivatsa at intel.com>
Cc: Manasi Navare <manasi.d.navare at intel.com>
Reviewed-by: Lucas De Marchi <lucas.demarchi at intel.com>
Signed-off-by: Dhinakaran Pandiyan <dhinakaran.pandiyan at intel.com>
Signed-off-by: Paulo Zanoni <paulo.r.zanoni at intel.com>
---
 drivers/gpu/drm/i915/i915_irq.c | 49 ++++++++++++++++++++++++++++++-----------
 drivers/gpu/drm/i915/i915_reg.h | 11 ++++++++-
 2 files changed, 46 insertions(+), 14 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 40e563eb3a1f..46aaef5c1851 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -115,11 +115,11 @@ static const u32 hpd_bxt[HPD_NUM_PINS] = {
 	[HPD_PORT_C] = BXT_DE_PORT_HP_DDIC
 };
 
-static const u32 hpd_tc_gen11[HPD_NUM_PINS] = {
-	[HPD_PORT_C] = GEN11_TC1_HOTPLUG,
-	[HPD_PORT_D] = GEN11_TC2_HOTPLUG,
-	[HPD_PORT_E] = GEN11_TC3_HOTPLUG,
-	[HPD_PORT_F] = GEN11_TC4_HOTPLUG
+static const u32 hpd_gen11[HPD_NUM_PINS] = {
+	[HPD_PORT_C] = GEN11_TC1_HOTPLUG | GEN11_TBT1_HOTPLUG,
+	[HPD_PORT_D] = GEN11_TC2_HOTPLUG | GEN11_TBT2_HOTPLUG,
+	[HPD_PORT_E] = GEN11_TC3_HOTPLUG | GEN11_TBT3_HOTPLUG,
+	[HPD_PORT_F] = GEN11_TC4_HOTPLUG | GEN11_TBT4_HOTPLUG
 };
 
 /* IIR can theoretically queue up two events. Be paranoid. */
@@ -2624,20 +2624,35 @@ static void bxt_hpd_irq_handler(struct drm_i915_private *dev_priv,
 static void gen11_hpd_irq_handler(struct drm_i915_private *dev_priv, u32 iir)
 {
 	u32 pin_mask = 0, long_mask = 0;
-	u32 trigger_tc, dig_hotplug_reg;
+	u32 trigger_tc = iir & GEN11_DE_TC_HOTPLUG_MASK;
+	u32 trigger_tbt = iir & GEN11_DE_TBT_HOTPLUG_MASK;
 
-	trigger_tc = iir & GEN11_DE_TC_HOTPLUG_MASK;
 	if (trigger_tc) {
+		u32 dig_hotplug_reg;
+
 		dig_hotplug_reg = I915_READ(GEN11_TC_HOTPLUG_CTL);
 		I915_WRITE(GEN11_TC_HOTPLUG_CTL, dig_hotplug_reg);
 
 		intel_get_hpd_pins(dev_priv, &pin_mask, &long_mask, trigger_tc,
-				   dig_hotplug_reg, hpd_tc_gen11,
+				   dig_hotplug_reg, hpd_gen11,
+				   gen11_port_hotplug_long_detect);
+	}
+
+	if (trigger_tbt) {
+		u32 dig_hotplug_reg;
+
+		dig_hotplug_reg = I915_READ(GEN11_TBT_HOTPLUG_CTL);
+		I915_WRITE(GEN11_TBT_HOTPLUG_CTL, dig_hotplug_reg);
+
+		intel_get_hpd_pins(dev_priv, &pin_mask, &long_mask, trigger_tbt,
+				   dig_hotplug_reg, hpd_gen11,
 				   gen11_port_hotplug_long_detect);
+	}
+
+	if (pin_mask)
 		intel_hpd_irq_handler(dev_priv, pin_mask, long_mask);
-	} else {
+	else
 		DRM_ERROR("Unexpected DE HPD interrupt 0x%08x\n", iir);
-	}
 }
 
 static irqreturn_t
@@ -3695,6 +3710,13 @@ static void gen11_hpd_detection_setup(struct drm_i915_private *dev_priv)
 		   GEN11_HOTPLUG_CTL_ENABLE(PORT_TC3) |
 		   GEN11_HOTPLUG_CTL_ENABLE(PORT_TC4);
 	I915_WRITE(GEN11_TC_HOTPLUG_CTL, hotplug);
+
+	hotplug = I915_READ(GEN11_TBT_HOTPLUG_CTL);
+	hotplug |= GEN11_HOTPLUG_CTL_ENABLE(PORT_TC1) |
+		   GEN11_HOTPLUG_CTL_ENABLE(PORT_TC2) |
+		   GEN11_HOTPLUG_CTL_ENABLE(PORT_TC3) |
+		   GEN11_HOTPLUG_CTL_ENABLE(PORT_TC4);
+	I915_WRITE(GEN11_TBT_HOTPLUG_CTL, hotplug);
 }
 
 static void gen11_hpd_irq_setup(struct drm_i915_private *dev_priv)
@@ -3702,8 +3724,8 @@ static void gen11_hpd_irq_setup(struct drm_i915_private *dev_priv)
 	u32 hotplug_irqs, enabled_irqs;
 	u32 val;
 
-	enabled_irqs = intel_hpd_enabled_irqs(dev_priv, hpd_tc_gen11);
-	hotplug_irqs = GEN11_DE_TC_HOTPLUG_MASK;
+	enabled_irqs = intel_hpd_enabled_irqs(dev_priv, hpd_gen11);
+	hotplug_irqs = GEN11_DE_TC_HOTPLUG_MASK | GEN11_DE_TBT_HOTPLUG_MASK;
 
 	val = I915_READ(GEN11_DE_HPD_IMR);
 	val &= ~hotplug_irqs;
@@ -4088,7 +4110,8 @@ static void gen8_de_irq_postinstall(struct drm_i915_private *dev_priv)
 
 	if (INTEL_GEN(dev_priv) >= 11) {
 		u32 de_hpd_masked = 0;
-		u32 de_hpd_enables = GEN11_DE_TC_HOTPLUG_MASK;
+		u32 de_hpd_enables = GEN11_DE_TC_HOTPLUG_MASK |
+				     GEN11_DE_TBT_HOTPLUG_MASK;
 
 		GEN3_IRQ_INIT(GEN11_DE_HPD_, ~de_hpd_masked, de_hpd_enables);
 		gen11_hpd_detection_setup(dev_priv);
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 6c0199fe9167..d423d1b60946 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -7091,7 +7091,16 @@ enum {
 						 GEN11_TC3_HOTPLUG | \
 						 GEN11_TC2_HOTPLUG | \
 						 GEN11_TC1_HOTPLUG)
-
+#define  GEN11_TBT4_HOTPLUG			(1 << 3)
+#define  GEN11_TBT3_HOTPLUG			(1 << 2)
+#define  GEN11_TBT2_HOTPLUG			(1 << 1)
+#define  GEN11_TBT1_HOTPLUG			(1 << 0)
+#define  GEN11_DE_TBT_HOTPLUG_MASK		(GEN11_TBT4_HOTPLUG | \
+						 GEN11_TBT3_HOTPLUG | \
+						 GEN11_TBT2_HOTPLUG | \
+						 GEN11_TBT1_HOTPLUG)
+
+#define GEN11_TBT_HOTPLUG_CTL				_MMIO(0x44030)
 #define GEN11_TC_HOTPLUG_CTL				_MMIO(0x44038)
 #define  GEN11_HOTPLUG_CTL_ENABLE(tc_port)		(8 << (tc_port) * 4)
 #define  GEN11_HOTPLUG_CTL_LONG_DETECT(tc_port)		(2 << (tc_port) * 4)
-- 
2.14.4