drm/i915: Add port A HPD support for SPT

On SKL the port A HPD has moved to the PCH. Hook it up.
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/i915_irq.c

@@ -74,6 +74,7 @@ static const u32 hpd_cpt[HPD_NUM_PINS] = {
 };
 
 static const u32 hpd_spt[HPD_NUM_PINS] = {
+	[HPD_PORT_A] = SDE_PORTA_HOTPLUG_SPT,
 	[HPD_PORT_B] = SDE_PORTB_HOTPLUG_CPT,
 	[HPD_PORT_C] = SDE_PORTC_HOTPLUG_CPT,
 	[HPD_PORT_D] = SDE_PORTD_HOTPLUG_CPT,
@@ -1316,6 +1317,22 @@ static bool spt_port_hotplug2_long_detect(enum port port, u32 val)
 	}
 }
 
+static bool spt_port_hotplug_long_detect(enum port port, u32 val)
+{
+	switch (port) {
+	case PORT_A:
+		return val & PORTA_HOTPLUG_LONG_DETECT;
+	case PORT_B:
+		return val & PORTB_HOTPLUG_LONG_DETECT;
+	case PORT_C:
+		return val & PORTC_HOTPLUG_LONG_DETECT;
+	case PORT_D:
+		return val & PORTD_HOTPLUG_LONG_DETECT;
+	default:
+		return false;
+	}
+}
+
 static bool ilk_port_hotplug_long_detect(enum port port, u32 val)
 {
 	switch (port) {
@@ -1899,7 +1916,7 @@ static void spt_irq_handler(struct drm_device *dev, u32 pch_iir)
 
 		intel_get_hpd_pins(&pin_mask, &long_mask, hotplug_trigger,
 				   dig_hotplug_reg, hpd_spt,
-				   pch_port_hotplug_long_detect);
+				   spt_port_hotplug_long_detect);
 	}
 
 	if (hotplug2_trigger) {
@@ -3203,7 +3220,7 @@ static void spt_hpd_irq_setup(struct drm_device *dev)
 	/* Enable digital hotplug on the PCH */
 	hotplug = I915_READ(PCH_PORT_HOTPLUG);
 	hotplug |= PORTD_HOTPLUG_ENABLE | PORTC_HOTPLUG_ENABLE |
-		PORTB_HOTPLUG_ENABLE;
+		PORTB_HOTPLUG_ENABLE | PORTA_HOTPLUG_ENABLE;
 	I915_WRITE(PCH_PORT_HOTPLUG, hotplug);
 
 	hotplug = I915_READ(PCH_PORT_HOTPLUG2);

drivers/gpu/drm/i915/i915_reg.h

@@ -5984,6 +5984,7 @@ enum skl_disp_power_wells {
 #define SDE_AUXB_CPT		(1 << 25)
 #define SDE_AUX_MASK_CPT	(7 << 25)
 #define SDE_PORTE_HOTPLUG_SPT	(1 << 25)
+#define SDE_PORTA_HOTPLUG_SPT	(1 << 24)
 #define SDE_PORTD_HOTPLUG_CPT	(1 << 23)
 #define SDE_PORTC_HOTPLUG_CPT	(1 << 22)
 #define SDE_PORTB_HOTPLUG_CPT	(1 << 21)
@@ -5997,7 +5998,8 @@ enum skl_disp_power_wells {
 #define SDE_HOTPLUG_MASK_SPT	(SDE_PORTE_HOTPLUG_SPT |	\
 				 SDE_PORTD_HOTPLUG_CPT |	\
 				 SDE_PORTC_HOTPLUG_CPT |	\
-				 SDE_PORTB_HOTPLUG_CPT)
+				 SDE_PORTB_HOTPLUG_CPT |	\
+				 SDE_PORTA_HOTPLUG_SPT)
 #define SDE_GMBUS_CPT		(1 << 17)
 #define SDE_ERROR_CPT		(1 << 16)
 #define SDE_AUDIO_CP_REQ_C_CPT	(1 << 10)