drm/i915: Refactor the hpd irq handling functions

A lot of the hpd irq handling is duplicated code, so refactor it a bit
by observing that in several places the only difference is the hpd[]
array. So pull the code to a few functions and pass in the hpd[] array
from the caller. Another option would be to determine the correct array
to use within the functions themselves, but somehow passing it in felt
nicer.

Further code reduction could be achieved by passing in the hotplug
register offset, and the long pulse detection function pointer. But that
didn't feel as good for some reason, so I left it at the middle ground.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/i915_irq.c

@@ -1748,23 +1748,30 @@ static irqreturn_t cherryview_irq_handler(int irq, void *arg)
 	return ret;
 }
 
-static void ibx_irq_handler(struct drm_device *dev, u32 pch_iir)
+static void ibx_hpd_irq_handler(struct drm_device *dev, u32 hotplug_trigger,
+				const u32 hpd[HPD_NUM_PINS])
 {
-	struct drm_i915_private *dev_priv = dev->dev_private;
-	int pipe;
-	u32 hotplug_trigger = pch_iir & SDE_HOTPLUG_MASK;
-
-	if (hotplug_trigger) {
+	struct drm_i915_private *dev_priv = to_i915(dev);
 	u32 dig_hotplug_reg, pin_mask = 0, long_mask = 0;
 
 	dig_hotplug_reg = I915_READ(PCH_PORT_HOTPLUG);
 	I915_WRITE(PCH_PORT_HOTPLUG, dig_hotplug_reg);
 
 	intel_get_hpd_pins(&pin_mask, &long_mask, hotplug_trigger,
-				   dig_hotplug_reg, hpd_ibx,
+			   dig_hotplug_reg, hpd,
 			   pch_port_hotplug_long_detect);
+
 	intel_hpd_irq_handler(dev, pin_mask, long_mask);
-	}
+}
+
+static void ibx_irq_handler(struct drm_device *dev, u32 pch_iir)
+{
+	struct drm_i915_private *dev_priv = dev->dev_private;
+	int pipe;
+	u32 hotplug_trigger = pch_iir & SDE_HOTPLUG_MASK;
+
+	if (hotplug_trigger)
+		ibx_hpd_irq_handler(dev, hotplug_trigger, hpd_ibx);
 
 	if (pch_iir & SDE_AUDIO_POWER_MASK) {
 		int port = ffs((pch_iir & SDE_AUDIO_POWER_MASK) >>
@@ -1857,19 +1864,8 @@ static void cpt_irq_handler(struct drm_device *dev, u32 pch_iir)
 	int pipe;
 	u32 hotplug_trigger = pch_iir & SDE_HOTPLUG_MASK_CPT;
 
-	if (hotplug_trigger) {
-		u32 dig_hotplug_reg, pin_mask = 0, long_mask = 0;
-
-		dig_hotplug_reg = I915_READ(PCH_PORT_HOTPLUG);
-		I915_WRITE(PCH_PORT_HOTPLUG, dig_hotplug_reg);
-
-		intel_get_hpd_pins(&pin_mask, &long_mask,
-				   hotplug_trigger,
-				   dig_hotplug_reg, hpd_cpt,
-				   pch_port_hotplug_long_detect);
-
-		intel_hpd_irq_handler(dev, pin_mask, long_mask);
-	}
+	if (hotplug_trigger)
+		ibx_hpd_irq_handler(dev, hotplug_trigger, hpd_cpt);
 
 	if (pch_iir & SDE_AUDIO_POWER_MASK_CPT) {
 		int port = ffs((pch_iir & SDE_AUDIO_POWER_MASK_CPT) >>
@@ -1937,23 +1933,30 @@ static void spt_irq_handler(struct drm_device *dev, u32 pch_iir)
 		gmbus_irq_handler(dev);
 }
 
-static void ilk_display_irq_handler(struct drm_device *dev, u32 de_iir)
+static void ilk_hpd_irq_handler(struct drm_device *dev, u32 hotplug_trigger,
+				const u32 hpd[HPD_NUM_PINS])
 {
-	struct drm_i915_private *dev_priv = dev->dev_private;
-	enum pipe pipe;
-	u32 hotplug_trigger = de_iir & DE_DP_A_HOTPLUG;
-
-	if (hotplug_trigger) {
+	struct drm_i915_private *dev_priv = to_i915(dev);
 	u32 dig_hotplug_reg, pin_mask = 0, long_mask = 0;
 
 	dig_hotplug_reg = I915_READ(DIGITAL_PORT_HOTPLUG_CNTRL);
 	I915_WRITE(DIGITAL_PORT_HOTPLUG_CNTRL, dig_hotplug_reg);
 
 	intel_get_hpd_pins(&pin_mask, &long_mask, hotplug_trigger,
-				   dig_hotplug_reg, hpd_ilk,
+			   dig_hotplug_reg, hpd,
 			   ilk_port_hotplug_long_detect);
+
 	intel_hpd_irq_handler(dev, pin_mask, long_mask);
-	}
+}
+
+static void ilk_display_irq_handler(struct drm_device *dev, u32 de_iir)
+{
+	struct drm_i915_private *dev_priv = dev->dev_private;
+	enum pipe pipe;
+	u32 hotplug_trigger = de_iir & DE_DP_A_HOTPLUG;
+
+	if (hotplug_trigger)
+		ilk_hpd_irq_handler(dev, hotplug_trigger, hpd_ilk);
 
 	if (de_iir & DE_AUX_CHANNEL_A)
 		dp_aux_irq_handler(dev);
@@ -2005,17 +2008,8 @@ static void ivb_display_irq_handler(struct drm_device *dev, u32 de_iir)
 	enum pipe pipe;
 	u32 hotplug_trigger = de_iir & DE_DP_A_HOTPLUG_IVB;
 
-	if (hotplug_trigger) {
-		u32 dig_hotplug_reg, pin_mask = 0, long_mask = 0;
-
-		dig_hotplug_reg = I915_READ(DIGITAL_PORT_HOTPLUG_CNTRL);
-		I915_WRITE(DIGITAL_PORT_HOTPLUG_CNTRL, dig_hotplug_reg);
-
-		intel_get_hpd_pins(&pin_mask, &long_mask, hotplug_trigger,
-				   dig_hotplug_reg, hpd_ivb,
-				   ilk_port_hotplug_long_detect);
-		intel_hpd_irq_handler(dev, pin_mask, long_mask);
-	}
+	if (hotplug_trigger)
+		ilk_hpd_irq_handler(dev, hotplug_trigger, hpd_ivb);
 
 	if (de_iir & DE_ERR_INT_IVB)
 		ivb_err_int_handler(dev);
@@ -2128,7 +2122,8 @@ static irqreturn_t ironlake_irq_handler(int irq, void *arg)
 	return ret;
 }
 
-static void bxt_hpd_irq_handler(struct drm_device *dev, u32 hotplug_trigger)
+static void bxt_hpd_irq_handler(struct drm_device *dev, u32 hotplug_trigger,
+				const u32 hpd[HPD_NUM_PINS])
 {
 	struct drm_i915_private *dev_priv = to_i915(dev);
 	u32 dig_hotplug_reg, pin_mask = 0, long_mask = 0;
@@ -2137,8 +2132,9 @@ static void bxt_hpd_irq_handler(struct drm_device *dev, u32 hotplug_trigger)
 	I915_WRITE(BXT_HOTPLUG_CTL, dig_hotplug_reg);
 
 	intel_get_hpd_pins(&pin_mask, &long_mask, hotplug_trigger,
-			   dig_hotplug_reg, hpd_bxt,
+			   dig_hotplug_reg, hpd,
 			   bxt_port_hotplug_long_detect);
+
 	intel_hpd_irq_handler(dev, pin_mask, long_mask);
 }
 
@@ -2198,26 +2194,16 @@ static irqreturn_t gen8_irq_handler(int irq, void *arg)
 			I915_WRITE(GEN8_DE_PORT_IIR, tmp);
 			ret = IRQ_HANDLED;
 
-			if (IS_BROADWELL(dev) && hotplug_trigger) {
-				u32 dig_hotplug_reg, pin_mask = 0, long_mask = 0;
-
-				dig_hotplug_reg = I915_READ(DIGITAL_PORT_HOTPLUG_CNTRL);
-				I915_WRITE(DIGITAL_PORT_HOTPLUG_CNTRL, dig_hotplug_reg);
-
-				intel_get_hpd_pins(&pin_mask, &long_mask, hotplug_trigger,
-						   dig_hotplug_reg, hpd_bdw,
-						   ilk_port_hotplug_long_detect);
-				intel_hpd_irq_handler(dev, pin_mask, long_mask);
-				found = true;
-			}
-
 			if (tmp & aux_mask) {
 				dp_aux_irq_handler(dev);
 				found = true;
 			}
 
-			if (IS_BROXTON(dev) && hotplug_trigger) {
-				bxt_hpd_irq_handler(dev, hotplug_trigger);
+			if (hotplug_trigger) {
+				if (IS_BROXTON(dev))
+					bxt_hpd_irq_handler(dev, hotplug_trigger, hpd_bxt);
+				else
+					ilk_hpd_irq_handler(dev, hotplug_trigger, hpd_bdw);
 				found = true;
 			}