[Intel-gfx] [PATCH 17/20] drm/i915/mtl: MTL PICA hotplug detection

[Mika Kahola <mika.kahola@intel.com>]

PICA is used for DP alt mode and TBT modes. Hotplug interruption is routed
from PICA chip to south display engine and from there to north display
engine. This patch adds functionality to enable hotplug detection for
all Type-C ports (4 ports available).

Differently from HPD in south display, PICA provides a dedicated HPD
control register for each supported port, so we loop over ports
ourselves instead of using intel_hpd_hotplug_enables() or
intel_get_hpd_pins().

BSpec: 49305, 55726, 65107, 65300

Signed-off-by: Mika Kahola <mika.kahola@intel.com>
Signed-off-by: Madhumitha Tolakanahalli Pradeep <madhumitha.tolakanahalli.pradeep@intel.com>
Signed-off-by: Gustavo Sousa <gustavo.sousa@intel.com>
---
 drivers/gpu/drm/i915/i915_irq.c | 226 +++++++++++++++++++++++++++++++-
 drivers/gpu/drm/i915/i915_reg.h |  31 ++++-
 2 files changed, 252 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 1ae7ac004a53..52517d7bbc75 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -163,6 +163,13 @@ static const u32 hpd_gen11[HPD_NUM_PINS] = {
 	[HPD_PORT_TC6] = GEN11_TC_HOTPLUG(HPD_PORT_TC6) | GEN11_TBT_HOTPLUG(HPD_PORT_TC6),
 };
 
+static const u32 hpd_xelpdp[HPD_NUM_PINS] = {
+	[HPD_PORT_TC1] = XELPDP_TBT_HOTPLUG(HPD_PORT_TC1) | XELPDP_DP_ALT_HOTPLUG(HPD_PORT_TC1),
+	[HPD_PORT_TC2] = XELPDP_TBT_HOTPLUG(HPD_PORT_TC2) | XELPDP_DP_ALT_HOTPLUG(HPD_PORT_TC2),
+	[HPD_PORT_TC3] = XELPDP_TBT_HOTPLUG(HPD_PORT_TC3) | XELPDP_DP_ALT_HOTPLUG(HPD_PORT_TC3),
+	[HPD_PORT_TC4] = XELPDP_TBT_HOTPLUG(HPD_PORT_TC4) | XELPDP_DP_ALT_HOTPLUG(HPD_PORT_TC4),
+};
+
 static const u32 hpd_icp[HPD_NUM_PINS] = {
 	[HPD_PORT_A] = SDE_DDI_HOTPLUG_ICP(HPD_PORT_A),
 	[HPD_PORT_B] = SDE_DDI_HOTPLUG_ICP(HPD_PORT_B),
@@ -183,6 +190,16 @@ static const u32 hpd_sde_dg1[HPD_NUM_PINS] = {
 	[HPD_PORT_TC1] = SDE_TC_HOTPLUG_DG2(HPD_PORT_TC1),
 };
 
+static const u32 hpd_mtp[HPD_NUM_PINS] = {
+	[HPD_PORT_A] = SDE_DDI_HOTPLUG_ICP(HPD_PORT_A),
+	[HPD_PORT_B] = SDE_DDI_HOTPLUG_ICP(HPD_PORT_B),
+	[HPD_PORT_TC1] = SDE_TC_HOTPLUG_ICP(HPD_PORT_TC1),
+	[HPD_PORT_TC2] = SDE_TC_HOTPLUG_ICP(HPD_PORT_TC2),
+	[HPD_PORT_TC3] = SDE_TC_HOTPLUG_ICP(HPD_PORT_TC3),
+	[HPD_PORT_TC4] = SDE_TC_HOTPLUG_ICP(HPD_PORT_TC4),
+};
+
+
 static void intel_hpd_init_pins(struct drm_i915_private *dev_priv)
 {
 	struct intel_hotplug *hpd = &dev_priv->display.hotplug;
@@ -196,7 +213,9 @@ static void intel_hpd_init_pins(struct drm_i915_private *dev_priv)
 		return;
 	}
 
-	if (DISPLAY_VER(dev_priv) >= 11)
+	if (DISPLAY_VER(dev_priv) >= 14)
+		hpd->hpd = hpd_xelpdp;
+	else if (DISPLAY_VER(dev_priv) >= 11)
 		hpd->hpd = hpd_gen11;
 	else if (IS_GEMINILAKE(dev_priv) || IS_BROXTON(dev_priv))
 		hpd->hpd = hpd_bxt;
@@ -213,6 +232,8 @@ static void intel_hpd_init_pins(struct drm_i915_private *dev_priv)
 
 	if (INTEL_PCH_TYPE(dev_priv) >= PCH_DG1)
 		hpd->pch_hpd = hpd_sde_dg1;
+	else if (INTEL_PCH_TYPE(dev_priv) >= PCH_MTP)
+		hpd->pch_hpd = hpd_mtp;
 	else if (INTEL_PCH_TYPE(dev_priv) >= PCH_ICP)
 		hpd->pch_hpd = hpd_icp;
 	else if (HAS_PCH_CNP(dev_priv) || HAS_PCH_SPT(dev_priv))
@@ -1965,6 +1986,44 @@ static void cpt_irq_handler(struct drm_i915_private *dev_priv, u32 pch_iir)
 		cpt_serr_int_handler(dev_priv);
 }
 
+static void xelpdp_pica_hpd_irq_handler(struct drm_i915_private *dev_priv, u32 iir)
+{
+	enum hpd_pin pin;
+	u32 hotplug_trigger = iir & (XELPDP_DP_ALT_HOTPLUG_MASK | XELPDP_TBT_HOTPLUG_MASK);
+	u32 trigger_aux = iir & XELPDP_AUX_TC_MASK;
+	u32 pin_mask = 0, long_mask = 0;
+
+	for (pin = HPD_PORT_TC1; pin <= HPD_PORT_TC4; pin++) {
+		u32 val;
+
+		if (!(dev_priv->display.hotplug.hpd[pin] & hotplug_trigger))
+			continue;
+
+		pin_mask |= BIT(pin);
+
+		val = intel_uncore_read(&dev_priv->uncore, XELPDP_PORT_HOTPLUG_CTL(pin));
+		intel_uncore_write(&dev_priv->uncore, XELPDP_PORT_HOTPLUG_CTL(pin), val);
+
+		if (val & (XELPDP_DP_ALT_HPD_LONG_DETECT | XELPDP_TBT_HPD_LONG_DETECT))
+			long_mask |= BIT(pin);
+	}
+
+	if (pin_mask) {
+		drm_dbg(&dev_priv->drm,
+			"pica hotplug event received, stat 0x%08x, pins 0x%08x, long 0x%08x\n",
+			hotplug_trigger, pin_mask, long_mask);
+
+		intel_hpd_irq_handler(dev_priv, pin_mask, long_mask);
+	}
+
+	if (trigger_aux)
+		dp_aux_irq_handler(dev_priv);
+
+	if (!pin_mask && !trigger_aux)
+		drm_err(&dev_priv->drm,
+			"Unexpected DE HPD/AUX interrupt 0x%08x\n", iir);
+}
+
 static void icp_irq_handler(struct drm_i915_private *dev_priv, u32 pch_iir)
 {
 	u32 ddi_hotplug_trigger = pch_iir & SDE_DDI_HOTPLUG_MASK_ICP;
@@ -1993,6 +2052,15 @@ static void icp_irq_handler(struct drm_i915_private *dev_priv, u32 pch_iir)
 				   icp_tc_port_hotplug_long_detect);
 	}
 
+	if (pch_iir & SDE_PICAINTERRUPT) {
+		u32 iir = intel_uncore_read(&dev_priv->uncore, PICAINTERRUPT_IIR);
+
+		if (iir) {
+			intel_uncore_write(&dev_priv->uncore, PICAINTERRUPT_IIR, iir);
+			xelpdp_pica_hpd_irq_handler(dev_priv, iir);
+		}
+	}
+
 	if (pin_mask)
 		intel_hpd_irq_handler(dev_priv, pin_mask, long_mask);
 
@@ -3159,7 +3227,11 @@ static void gen11_display_irq_reset(struct drm_i915_private *dev_priv)
 
 	GEN3_IRQ_RESET(uncore, GEN8_DE_PORT_);
 	GEN3_IRQ_RESET(uncore, GEN8_DE_MISC_);
-	GEN3_IRQ_RESET(uncore, GEN11_DE_HPD_);
+
+	if (DISPLAY_VER(dev_priv) >= 14)
+		GEN3_IRQ_RESET(uncore, PICAINTERRUPT_);
+	else
+		GEN3_IRQ_RESET(uncore, GEN11_DE_HPD_);
 
 	if (INTEL_PCH_TYPE(dev_priv) >= PCH_ICP)
 		GEN3_IRQ_RESET(uncore, SDE);
@@ -3452,6 +3524,131 @@ static void gen11_hpd_irq_setup(struct drm_i915_private *dev_priv)
 		icp_hpd_irq_setup(dev_priv);
 }
 
+static u32 mtp_ddi_hotplug_enables(struct drm_i915_private *i915,
+				   enum hpd_pin pin)
+{
+	switch (pin) {
+	case HPD_PORT_A:
+	case HPD_PORT_B:
+		return SHOTPLUG_CTL_DDI_HPD_ENABLE(pin);
+	default:
+		return 0;
+	}
+}
+
+static u32 mtp_tc_hotplug_enables(struct drm_i915_private *i915,
+				  enum hpd_pin pin)
+{
+	switch (pin) {
+	case HPD_PORT_TC1:
+	case HPD_PORT_TC2:
+	case HPD_PORT_TC3:
+	case HPD_PORT_TC4:
+		return ICP_TC_HPD_ENABLE(pin);
+	default:
+		return 0;
+	}
+}
+
+static void mtp_ddi_hpd_detection_setup(struct drm_i915_private *dev_priv)
+{
+	u32 hotplug;
+
+	hotplug = intel_uncore_read(&dev_priv->uncore, SHOTPLUG_CTL_DDI);
+	hotplug &= ~(SHOTPLUG_CTL_DDI_HPD_ENABLE(HPD_PORT_A) |
+		     SHOTPLUG_CTL_DDI_HPD_ENABLE(HPD_PORT_B));
+	hotplug |= intel_hpd_hotplug_enables(dev_priv, mtp_ddi_hotplug_enables);
+	intel_uncore_write(&dev_priv->uncore, SHOTPLUG_CTL_DDI, hotplug);
+}
+
+static void mtp_tc_hpd_detection_setup(struct drm_i915_private *dev_priv)
+{
+	u32 hotplug;
+
+	hotplug = intel_uncore_read(&dev_priv->uncore, SHOTPLUG_CTL_TC);
+	hotplug &= ~(ICP_TC_HPD_ENABLE(HPD_PORT_TC1) |
+		     ICP_TC_HPD_ENABLE(HPD_PORT_TC2) |
+		     ICP_TC_HPD_ENABLE(HPD_PORT_TC3) |
+		     ICP_TC_HPD_ENABLE(HPD_PORT_TC4));
+	hotplug |= intel_hpd_hotplug_enables(dev_priv, mtp_tc_hotplug_enables);
+	intel_uncore_write(&dev_priv->uncore, SHOTPLUG_CTL_TC, hotplug);
+}
+
+static void mtp_hpd_invert(struct drm_i915_private *i915)
+{
+	u32 val = (INVERT_DDIA_HPD |
+		   INVERT_DDIB_HPD |
+		   INVERT_DDIC_HPD |
+		   INVERT_TC1_HPD |
+		   INVERT_TC2_HPD |
+		   INVERT_TC3_HPD |
+		   INVERT_TC4_HPD |
+		   INVERT_DDID_HPD_MTP |
+		   INVERT_DDIE_HPD);
+	intel_uncore_rmw(&i915->uncore, SOUTH_CHICKEN1, 0, val);
+}
+
+static void mtp_hpd_irq_setup(struct drm_i915_private *dev_priv)
+{
+	u32 hotplug_irqs, enabled_irqs;
+
+	enabled_irqs = intel_hpd_enabled_irqs(dev_priv, dev_priv->display.hotplug.pch_hpd);
+	hotplug_irqs = intel_hpd_hotplug_irqs(dev_priv, dev_priv->display.hotplug.pch_hpd);
+
+	intel_uncore_write(&dev_priv->uncore, SHPD_FILTER_CNT, SHPD_FILTER_CNT_500_ADJ);
+
+	mtp_hpd_invert(dev_priv);
+
+	ibx_display_interrupt_update(dev_priv, hotplug_irqs, enabled_irqs);
+
+	mtp_ddi_hpd_detection_setup(dev_priv);
+	mtp_tc_hpd_detection_setup(dev_priv);
+
+}
+
+static void xelpdp_pica_hpd_detection_setup(struct drm_i915_private *dev_priv)
+{
+	struct intel_encoder *encoder;
+	enum hpd_pin pin;
+	u32 available_pins = 0;
+
+	BUILD_BUG_ON(BITS_PER_TYPE(available_pins) < HPD_NUM_PINS);
+
+	for_each_intel_encoder(&dev_priv->drm, encoder)
+		available_pins |= BIT(encoder->hpd_pin);
+
+	for (pin = HPD_PORT_TC1; pin <= HPD_PORT_TC4; pin++) {
+		u32 mask = (available_pins & BIT(pin)) ? ~(u32)0 : 0;
+		u32 val = XELPDP_TBT_HOTPLUG_ENABLE |
+			  XELPDP_DP_ALT_HOTPLUG_ENABLE;
+
+		intel_uncore_rmw(&dev_priv->uncore,
+				 XELPDP_PORT_HOTPLUG_CTL(pin),
+				 ~mask & val, mask & val);
+	}
+}
+
+static void xelpdp_hpd_irq_setup(struct drm_i915_private *dev_priv)
+{
+	u32 hotplug_irqs, enabled_irqs;
+	u32 val;
+
+	enabled_irqs = intel_hpd_enabled_irqs(dev_priv, dev_priv->display.hotplug.hpd);
+	hotplug_irqs = intel_hpd_hotplug_irqs(dev_priv, dev_priv->display.hotplug.hpd);
+
+	val = intel_uncore_read(&dev_priv->uncore, PICAINTERRUPT_IMR);
+	val &= ~hotplug_irqs;
+	val |= ~enabled_irqs & hotplug_irqs;
+	intel_uncore_write(&dev_priv->uncore, PICAINTERRUPT_IMR, val);
+	intel_uncore_posting_read(&dev_priv->uncore, PICAINTERRUPT_IMR);
+
+	xelpdp_pica_hpd_detection_setup(dev_priv);
+
+	if (INTEL_PCH_TYPE(dev_priv) >= PCH_MTP) {
+		mtp_hpd_irq_setup(dev_priv);
+	}
+}
+
 static u32 spt_hotplug_enables(struct drm_i915_private *i915,
 			       enum hpd_pin pin)
 {
@@ -3791,7 +3988,7 @@ static void gen8_de_irq_postinstall(struct drm_i915_private *dev_priv)
 	GEN3_IRQ_INIT(uncore, GEN8_DE_PORT_, ~de_port_masked, de_port_enables);
 	GEN3_IRQ_INIT(uncore, GEN8_DE_MISC_, ~de_misc_masked, de_misc_masked);
 
-	if (DISPLAY_VER(dev_priv) >= 11) {
+	if (IS_DISPLAY_VER(dev_priv, 11, 13)) {
 		u32 de_hpd_masked = 0;
 		u32 de_hpd_enables = GEN11_DE_TC_HOTPLUG_MASK |
 				     GEN11_DE_TBT_HOTPLUG_MASK;
@@ -3801,6 +3998,20 @@ static void gen8_de_irq_postinstall(struct drm_i915_private *dev_priv)
 	}
 }
 
+static void mtp_irq_postinstall(struct drm_i915_private *dev_priv)
+{
+	struct intel_uncore *uncore = &dev_priv->uncore;
+	u32 sde_mask = SDE_GMBUS_ICP | SDE_PICAINTERRUPT;
+	u32 de_hpd_mask = XELPDP_AUX_TC_MASK;
+	u32 de_hpd_enables = de_hpd_mask | XELPDP_DP_ALT_HOTPLUG_MASK |
+			     XELPDP_TBT_HOTPLUG_MASK;
+
+	GEN3_IRQ_INIT(uncore, PICAINTERRUPT_, ~de_hpd_mask,
+		      de_hpd_enables);
+
+	GEN3_IRQ_INIT(uncore, SDE, ~sde_mask, 0xffffffff);
+}
+
 static void icp_irq_postinstall(struct drm_i915_private *dev_priv)
 {
 	struct intel_uncore *uncore = &dev_priv->uncore;
@@ -3862,7 +4073,11 @@ static void dg1_irq_postinstall(struct drm_i915_private *dev_priv)
 	GEN3_IRQ_INIT(uncore, GEN11_GU_MISC_, ~gu_misc_masked, gu_misc_masked);
 
 	if (HAS_DISPLAY(dev_priv)) {
-		icp_irq_postinstall(dev_priv);
+		if (DISPLAY_VER(dev_priv) >= 14)
+			mtp_irq_postinstall(dev_priv);
+		else
+			icp_irq_postinstall(dev_priv);
+
 		gen8_de_irq_postinstall(dev_priv);
 		intel_uncore_write(&dev_priv->uncore, GEN11_DISPLAY_INT_CTL,
 				   GEN11_DISPLAY_IRQ_ENABLE);
@@ -4320,6 +4535,7 @@ static const struct intel_hotplug_funcs platform##_hpd_funcs = { \
 }
 
 HPD_FUNCS(i915);
+HPD_FUNCS(xelpdp);
 HPD_FUNCS(dg1);
 HPD_FUNCS(gen11);
 HPD_FUNCS(bxt);
@@ -4380,6 +4596,8 @@ void intel_irq_init(struct drm_i915_private *dev_priv)
 			dev_priv->display.funcs.hotplug = &icp_hpd_funcs;
 		else if (HAS_PCH_DG1(dev_priv))
 			dev_priv->display.funcs.hotplug = &dg1_hpd_funcs;
+		else if (DISPLAY_VER(dev_priv) >= 14)
+			dev_priv->display.funcs.hotplug = &xelpdp_hpd_funcs;
 		else if (DISPLAY_VER(dev_priv) >= 11)
 			dev_priv->display.funcs.hotplug = &gen11_hpd_funcs;
 		else if (IS_GEMINILAKE(dev_priv) || IS_BROXTON(dev_priv))
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index abf12d459bc2..7dfe4bd2618b 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -5667,6 +5667,28 @@
 #define  GEN11_HOTPLUG_CTL_SHORT_DETECT(hpd_pin)	(1 << (_HPD_PIN_TC(hpd_pin) * 4))
 #define  GEN11_HOTPLUG_CTL_NO_DETECT(hpd_pin)		(0 << (_HPD_PIN_TC(hpd_pin) * 4))
 
+#define PICAINTERRUPT_ISR		_MMIO(0x16FE50)
+#define PICAINTERRUPT_IMR		_MMIO(0x16FE54)
+#define PICAINTERRUPT_IIR		_MMIO(0x16FE58)
+#define PICAINTERRUPT_IER		_MMIO(0x16FE5C)
+
+#define  XELPDP_DP_ALT_HOTPLUG(hpd_pin)		REG_BIT(16 + _HPD_PIN_TC(hpd_pin))
+#define  XELPDP_DP_ALT_HOTPLUG_MASK		REG_GENMASK(19, 16)
+
+#define  XELPDP_AUX_TC(hpd_pin)			REG_BIT(8 + _HPD_PIN_TC(hpd_pin))
+#define  XELPDP_AUX_TC_MASK			REG_GENMASK(11, 8)
+
+#define  XELPDP_TBT_HOTPLUG(hpd_pin)		REG_BIT(_HPD_PIN_TC(hpd_pin))
+#define  XELPDP_TBT_HOTPLUG_MASK		REG_GENMASK(3, 0)
+
+#define XELPDP_PORT_HOTPLUG_CTL(hpd_pin)	_MMIO(0x16F270 + (_HPD_PIN_TC(hpd_pin) * 0x200))
+#define  XELPDP_TBT_HOTPLUG_ENABLE		REG_BIT(6)
+#define  XELPDP_TBT_HPD_LONG_DETECT		REG_BIT(5)
+#define  XELPDP_TBT_HPD_SHORT_DETECT		REG_BIT(4)
+#define  XELPDP_DP_ALT_HOTPLUG_ENABLE		REG_BIT(2)
+#define  XELPDP_DP_ALT_HPD_LONG_DETECT		REG_BIT(1)
+#define  XELPDP_DP_ALT_HPD_SHORT_DETECT		REG_BIT(0)
+
 #define XELPDP_INITIATE_PMDEMAND_REQUEST(dword)		_MMIO(0x45230 + 4 * (dword))
 #define  XELPDP_PMDEMAND_QCLK_GV_BW_MASK		REG_GENMASK(31, 16)
 #define  XELPDP_PMDEMAND_QCLK_GV_BW(x)			REG_FIELD_PREP(XELPDP_PMDEMAND_QCLK_GV_BW_MASK, x)
@@ -6002,7 +6024,8 @@
 				 SDE_FDI_RXB_CPT | \
 				 SDE_FDI_RXA_CPT)
 
-/* south display engine interrupt: ICP/TGP */
+/* south display engine interrupt: ICP/TGP/MTP */
+#define SDE_PICAINTERRUPT		REG_BIT(31)
 #define SDE_GMBUS_ICP			(1 << 23)
 #define SDE_TC_HOTPLUG_ICP(hpd_pin)	REG_BIT(24 + _HPD_PIN_TC(hpd_pin))
 #define SDE_TC_HOTPLUG_DG2(hpd_pin)	REG_BIT(25 + _HPD_PIN_TC(hpd_pin)) /* sigh */
@@ -6355,6 +6378,12 @@
 #define SOUTH_CHICKEN1		_MMIO(0xc2000)
 #define  FDIA_PHASE_SYNC_SHIFT_OVR	19
 #define  FDIA_PHASE_SYNC_SHIFT_EN	18
+#define  INVERT_DDIE_HPD			REG_BIT(28)
+#define  INVERT_DDID_HPD_MTP			REG_BIT(27)
+#define  INVERT_TC4_HPD				REG_BIT(26)
+#define  INVERT_TC3_HPD				REG_BIT(25)
+#define  INVERT_TC2_HPD				REG_BIT(24)
+#define  INVERT_TC1_HPD				REG_BIT(23)
 #define  INVERT_DDID_HPD			(1 << 18)
 #define  INVERT_DDIC_HPD			(1 << 17)
 #define  INVERT_DDIB_HPD			(1 << 16)
-- 
2.34.1