drm/i915/tgl: Add hpd interrupt handling

Add hotdplug detection for all ports on TGP. icp_hpd_detection_setup()
is refactored to be shared with TGP.

While we increase the number of pins, add a BUILD_BUG_ON() to avoid
going over the number of bits allowed.

v2: use BITS_PER_TYPE and correct type for BUILD_BUG_ON() check
    (requested by Ville)

Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Jose Souza <jose.souza@intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190725234813.27179-2-lucas.demarchi@intel.com

drivers/gpu/drm/i915/display/intel_hotplug.c

@@ -104,6 +104,12 @@ enum hpd_pin intel_hpd_pin_default(struct drm_i915_private *dev_priv,
 		if (IS_CNL_WITH_PORT_F(dev_priv))
 			return HPD_PORT_E;
 		return HPD_PORT_F;
+	case PORT_G:
+		return HPD_PORT_G;
+	case PORT_H:
+		return HPD_PORT_H;
+	case PORT_I:
+		return HPD_PORT_I;
 	default:
 		MISSING_CASE(port);
 		return HPD_NONE;

drivers/gpu/drm/i915/i915_drv.h

@@ -153,6 +153,10 @@ enum hpd_pin {
 	HPD_PORT_D,
 	HPD_PORT_E,
 	HPD_PORT_F,
+	HPD_PORT_G,
+	HPD_PORT_H,
+	HPD_PORT_I,
+
 	HPD_NUM_PINS
 };
 

drivers/gpu/drm/i915/i915_irq.c

@@ -150,6 +150,18 @@ static const u32 hpd_mcc[HPD_NUM_PINS] = {
 	[HPD_PORT_C] = SDE_TC1_HOTPLUG_ICP
 };
 
+static const u32 hpd_tgp[HPD_NUM_PINS] = {
+	[HPD_PORT_A] = SDE_DDIA_HOTPLUG_ICP,
+	[HPD_PORT_B] = SDE_DDIB_HOTPLUG_ICP,
+	[HPD_PORT_C] = SDE_DDIC_HOTPLUG_TGP,
+	[HPD_PORT_D] = SDE_TC1_HOTPLUG_ICP,
+	[HPD_PORT_E] = SDE_TC2_HOTPLUG_ICP,
+	[HPD_PORT_F] = SDE_TC3_HOTPLUG_ICP,
+	[HPD_PORT_G] = SDE_TC4_HOTPLUG_ICP,
+	[HPD_PORT_H] = SDE_TC5_HOTPLUG_TGP,
+	[HPD_PORT_I] = SDE_TC6_HOTPLUG_TGP,
+};
+
 static void gen3_irq_reset(struct intel_uncore *uncore, i915_reg_t imr,
 			   i915_reg_t iir, i915_reg_t ier)
 {
@@ -1724,6 +1736,40 @@ static bool icp_tc_port_hotplug_long_detect(enum hpd_pin pin, u32 val)
 	}
 }
 
+static bool tgp_ddi_port_hotplug_long_detect(enum hpd_pin pin, u32 val)
+{
+	switch (pin) {
+	case HPD_PORT_A:
+		return val & ICP_DDIA_HPD_LONG_DETECT;
+	case HPD_PORT_B:
+		return val & ICP_DDIB_HPD_LONG_DETECT;
+	case HPD_PORT_C:
+		return val & TGP_DDIC_HPD_LONG_DETECT;
+	default:
+		return false;
+	}
+}
+
+static bool tgp_tc_port_hotplug_long_detect(enum hpd_pin pin, u32 val)
+{
+	switch (pin) {
+	case HPD_PORT_D:
+		return val & ICP_TC_HPD_LONG_DETECT(PORT_TC1);
+	case HPD_PORT_E:
+		return val & ICP_TC_HPD_LONG_DETECT(PORT_TC2);
+	case HPD_PORT_F:
+		return val & ICP_TC_HPD_LONG_DETECT(PORT_TC3);
+	case HPD_PORT_G:
+		return val & ICP_TC_HPD_LONG_DETECT(PORT_TC4);
+	case HPD_PORT_H:
+		return val & ICP_TC_HPD_LONG_DETECT(PORT_TC5);
+	case HPD_PORT_I:
+		return val & ICP_TC_HPD_LONG_DETECT(PORT_TC6);
+	default:
+		return false;
+	}
+}
+
 static bool spt_port_hotplug2_long_detect(enum hpd_pin pin, u32 val)
 {
 	switch (pin) {
@@ -1803,6 +1849,8 @@ static void intel_get_hpd_pins(struct drm_i915_private *dev_priv,
 {
 	enum hpd_pin pin;
 
+	BUILD_BUG_ON(BITS_PER_TYPE(*pin_mask) < HPD_NUM_PINS);
+
 	for_each_hpd_pin(pin) {
 		if ((hpd[pin] & hotplug_trigger) == 0)
 			continue;
@@ -2561,6 +2609,43 @@ static void icp_irq_handler(struct drm_i915_private *dev_priv, u32 pch_iir,
 		gmbus_irq_handler(dev_priv);
 }
 
+static void tgp_irq_handler(struct drm_i915_private *dev_priv, u32 pch_iir)
+{
+	u32 ddi_hotplug_trigger = pch_iir & SDE_DDI_MASK_TGP;
+	u32 tc_hotplug_trigger = pch_iir & SDE_TC_MASK_TGP;
+	u32 pin_mask = 0, long_mask = 0;
+
+	if (ddi_hotplug_trigger) {
+		u32 dig_hotplug_reg;
+
+		dig_hotplug_reg = I915_READ(SHOTPLUG_CTL_DDI);
+		I915_WRITE(SHOTPLUG_CTL_DDI, dig_hotplug_reg);
+
+		intel_get_hpd_pins(dev_priv, &pin_mask, &long_mask,
+				   ddi_hotplug_trigger,
+				   dig_hotplug_reg, hpd_tgp,
+				   tgp_ddi_port_hotplug_long_detect);
+	}
+
+	if (tc_hotplug_trigger) {
+		u32 dig_hotplug_reg;
+
+		dig_hotplug_reg = I915_READ(SHOTPLUG_CTL_TC);
+		I915_WRITE(SHOTPLUG_CTL_TC, dig_hotplug_reg);
+
+		intel_get_hpd_pins(dev_priv, &pin_mask, &long_mask,
+				   tc_hotplug_trigger,
+				   dig_hotplug_reg, hpd_tgp,
+				   tgp_tc_port_hotplug_long_detect);
+	}
+
+	if (pin_mask)
+		intel_hpd_irq_handler(dev_priv, pin_mask, long_mask);
+
+	if (pch_iir & SDE_GMBUS_ICP)
+		gmbus_irq_handler(dev_priv);
+}
+
 static void spt_irq_handler(struct drm_i915_private *dev_priv, u32 pch_iir)
 {
 	u32 hotplug_trigger = pch_iir & SDE_HOTPLUG_MASK_SPT &
@@ -2983,7 +3068,9 @@ gen8_de_irq_handler(struct drm_i915_private *dev_priv, u32 master_ctl)
 			I915_WRITE(SDEIIR, iir);
 			ret = IRQ_HANDLED;
 
-			if (INTEL_PCH_TYPE(dev_priv) >= PCH_MCC)
+			if (INTEL_PCH_TYPE(dev_priv) >= PCH_TGP)
+				tgp_irq_handler(dev_priv, iir);
+			else if (INTEL_PCH_TYPE(dev_priv) >= PCH_MCC)
 				icp_irq_handler(dev_priv, iir, hpd_mcc);
 			else if (INTEL_PCH_TYPE(dev_priv) >= PCH_ICP)
 				icp_irq_handler(dev_priv, iir, hpd_icp);
@@ -3778,20 +3865,18 @@ static void ibx_hpd_irq_setup(struct drm_i915_private *dev_priv)
 	ibx_hpd_detection_setup(dev_priv);
 }
 
-static void icp_hpd_detection_setup(struct drm_i915_private *dev_priv)
+static void icp_hpd_detection_setup(struct drm_i915_private *dev_priv,
+				    u32 ddi_hotplug_enable_mask,
+				    u32 tc_hotplug_enable_mask)
 {
 	u32 hotplug;
 
 	hotplug = I915_READ(SHOTPLUG_CTL_DDI);
-	hotplug |= ICP_DDIA_HPD_ENABLE |
-		   ICP_DDIB_HPD_ENABLE;
+	hotplug |= ddi_hotplug_enable_mask;
 	I915_WRITE(SHOTPLUG_CTL_DDI, hotplug);
 
 	hotplug = I915_READ(SHOTPLUG_CTL_TC);
-	hotplug |= ICP_TC_HPD_ENABLE(PORT_TC1) |
-		   ICP_TC_HPD_ENABLE(PORT_TC2) |
-		   ICP_TC_HPD_ENABLE(PORT_TC3) |
-		   ICP_TC_HPD_ENABLE(PORT_TC4);
+	hotplug |= tc_hotplug_enable_mask;
 	I915_WRITE(SHOTPLUG_CTL_TC, hotplug);
 }
 
@@ -3804,7 +3889,21 @@ static void icp_hpd_irq_setup(struct drm_i915_private *dev_priv)
 
 	ibx_display_interrupt_update(dev_priv, hotplug_irqs, enabled_irqs);
 
-	icp_hpd_detection_setup(dev_priv);
+	icp_hpd_detection_setup(dev_priv, ICP_DDI_HPD_ENABLE_MASK,
+				ICP_TC_HPD_ENABLE_MASK);
+}
+
+static void tgp_hpd_irq_setup(struct drm_i915_private *dev_priv)
+{
+	u32 hotplug_irqs, enabled_irqs;
+
+	hotplug_irqs = SDE_DDI_MASK_TGP | SDE_TC_MASK_TGP;
+	enabled_irqs = intel_hpd_enabled_irqs(dev_priv, hpd_tgp);
+
+	ibx_display_interrupt_update(dev_priv, hotplug_irqs, enabled_irqs);
+
+	icp_hpd_detection_setup(dev_priv, TGP_DDI_HPD_ENABLE_MASK,
+				TGP_TC_HPD_ENABLE_MASK);
 }
 
 static void gen11_hpd_detection_setup(struct drm_i915_private *dev_priv)
@@ -3841,7 +3940,9 @@ static void gen11_hpd_irq_setup(struct drm_i915_private *dev_priv)
 
 	gen11_hpd_detection_setup(dev_priv);
 
-	if (INTEL_PCH_TYPE(dev_priv) >= PCH_ICP)
+	if (INTEL_PCH_TYPE(dev_priv) >= PCH_TGP)
+		tgp_hpd_irq_setup(dev_priv);
+	else if (INTEL_PCH_TYPE(dev_priv) >= PCH_ICP)
 		icp_hpd_irq_setup(dev_priv);
 }
 
@@ -4291,7 +4392,12 @@ static void icp_irq_postinstall(struct drm_i915_private *dev_priv)
 	gen3_assert_iir_is_zero(&dev_priv->uncore, SDEIIR);
 	I915_WRITE(SDEIMR, ~mask);
 
-	icp_hpd_detection_setup(dev_priv);
+	if (HAS_PCH_TGP(dev_priv))
+		icp_hpd_detection_setup(dev_priv, TGP_DDI_HPD_ENABLE_MASK,
+					TGP_TC_HPD_ENABLE_MASK);
+	else
+		icp_hpd_detection_setup(dev_priv, ICP_DDI_HPD_ENABLE_MASK,
+					ICP_TC_HPD_ENABLE_MASK);
 }
 
 static void gen11_irq_postinstall(struct drm_i915_private *dev_priv)

drivers/gpu/drm/i915/i915_reg.h

@@ -7861,12 +7861,15 @@ enum {
 				 SDE_FDI_RXB_CPT | \
 				 SDE_FDI_RXA_CPT)
 
-/* south display engine interrupt: ICP */
+/* south display engine interrupt: ICP/TGP */
+#define SDE_TC6_HOTPLUG_TGP		(1 << 29)
+#define SDE_TC5_HOTPLUG_TGP		(1 << 28)
 #define SDE_TC4_HOTPLUG_ICP		(1 << 27)
 #define SDE_TC3_HOTPLUG_ICP		(1 << 26)
 #define SDE_TC2_HOTPLUG_ICP		(1 << 25)
 #define SDE_TC1_HOTPLUG_ICP		(1 << 24)
 #define SDE_GMBUS_ICP			(1 << 23)
+#define SDE_DDIC_HOTPLUG_TGP		(1 << 18)
 #define SDE_DDIB_HOTPLUG_ICP		(1 << 17)
 #define SDE_DDIA_HOTPLUG_ICP		(1 << 16)
 #define SDE_TC_HOTPLUG_ICP(tc_port)	(1 << ((tc_port) + 24))
@@ -7877,6 +7880,11 @@ enum {
 					 SDE_TC3_HOTPLUG_ICP |	\
 					 SDE_TC2_HOTPLUG_ICP |	\
 					 SDE_TC1_HOTPLUG_ICP)
+#define SDE_DDI_MASK_TGP		(SDE_DDIC_HOTPLUG_TGP | \
+					 SDE_DDI_MASK_ICP)
+#define SDE_TC_MASK_TGP			(SDE_TC6_HOTPLUG_TGP |	\
+					 SDE_TC5_HOTPLUG_TGP |	\
+					 SDE_TC_MASK_ICP)
 
 #define SDEISR  _MMIO(0xc4000)
 #define SDEIMR  _MMIO(0xc4004)
@@ -7944,6 +7952,12 @@ enum {
  */
 
 #define SHOTPLUG_CTL_DDI			_MMIO(0xc4030)
+#define   TGP_DDIC_HPD_ENABLE			(1 << 11)
+#define   TGP_DDIC_HPD_STATUS_MASK		(3 << 8)
+#define   TGP_DDIC_HPD_NO_DETECT		(0 << 8)
+#define   TGP_DDIC_HPD_SHORT_DETECT		(1 << 8)
+#define   TGP_DDIC_HPD_LONG_DETECT		(2 << 8)
+#define   TGP_DDIC_HPD_SHORT_LONG_DETECT	(3 << 8)
 #define   ICP_DDIB_HPD_ENABLE			(1 << 7)
 #define   ICP_DDIB_HPD_STATUS_MASK		(3 << 4)
 #define   ICP_DDIB_HPD_NO_DETECT		(0 << 4)
@@ -8067,6 +8081,18 @@ enum {
 #define   ICP_TC_HPD_LONG_DETECT(tc_port)	(2 << (tc_port) * 4)
 #define   ICP_TC_HPD_SHORT_DETECT(tc_port)	(1 << (tc_port) * 4)
 
+#define ICP_DDI_HPD_ENABLE_MASK		(ICP_DDIB_HPD_ENABLE |	\
+					 ICP_DDIA_HPD_ENABLE)
+#define ICP_TC_HPD_ENABLE_MASK		(ICP_TC_HPD_ENABLE(PORT_TC4) | \
+					 ICP_TC_HPD_ENABLE(PORT_TC3) | \
+					 ICP_TC_HPD_ENABLE(PORT_TC2) | \
+					 ICP_TC_HPD_ENABLE(PORT_TC1))
+#define TGP_DDI_HPD_ENABLE_MASK		(TGP_DDIC_HPD_ENABLE |	\
+					 ICP_DDI_HPD_ENABLE_MASK)
+#define TGP_TC_HPD_ENABLE_MASK		(ICP_TC_HPD_ENABLE(PORT_TC6) | \
+					 ICP_TC_HPD_ENABLE(PORT_TC5) | \
+					 ICP_TC_HPD_ENABLE_MASK)
+
 #define _PCH_DPLL_A              0xc6014
 #define _PCH_DPLL_B              0xc6018
 #define PCH_DPLL(pll) _MMIO((pll) == 0 ? _PCH_DPLL_A : _PCH_DPLL_B)