drm/i915: combine i9xx_get_hpd_pins and pch_get_hpd_pins

These functions are quite similar, so combine them with the use of a new
argument for a function that detects long pulses. This will be also
needed by an upcoming patch adding support for BXT long pulse detection.

No functional change.

v2:
- rebase on top -nightly (Daniel)

Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Sonika Jindal <sonika.jindal@intel.com>
Reviewed-by: Sivakumar Thulasimani <sivakumar.thulasimani@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/i915_irq.c

@@ -1256,9 +1256,10 @@ static bool i9xx_port_hotplug_long_detect(enum port port, u32 val)
 }
 
 /* Get a bit mask of pins that have triggered, and which ones may be long. */
-static void pch_get_hpd_pins(u32 *pin_mask, u32 *long_mask,
+static void intel_get_hpd_pins(u32 *pin_mask, u32 *long_mask,
 			     u32 hotplug_trigger, u32 dig_hotplug_reg,
-			     const u32 hpd[HPD_NUM_PINS])
+			     const u32 hpd[HPD_NUM_PINS],
+			     bool long_pulse_detect(enum port port, u32 val))
 {
 	enum port port;
 	int i;
@@ -1273,7 +1274,7 @@ static void pch_get_hpd_pins(u32 *pin_mask, u32 *long_mask,
 		*pin_mask |= BIT(i);
 
 		port = intel_hpd_pin_to_port(i);
-		if (pch_port_hotplug_long_detect(port, dig_hotplug_reg))
+		if (long_pulse_detect(port, dig_hotplug_reg))
 			*long_mask |= BIT(i);
 	}
 
@@ -1282,34 +1283,6 @@ static void pch_get_hpd_pins(u32 *pin_mask, u32 *long_mask,
 
 }
 
-/* Get a bit mask of pins that have triggered, and which ones may be long. */
-static void i9xx_get_hpd_pins(u32 *pin_mask, u32 *long_mask,
-			      u32 hotplug_trigger, const u32 hpd[HPD_NUM_PINS])
-{
-	enum port port;
-	int i;
-
-	*pin_mask = 0;
-	*long_mask = 0;
-
-	if (!hotplug_trigger)
-		return;
-
-	for_each_hpd_pin(i) {
-		if ((hpd[i] & hotplug_trigger) == 0)
-			continue;
-
-		*pin_mask |= BIT(i);
-
-		port = intel_hpd_pin_to_port(i);
-		if (i9xx_port_hotplug_long_detect(port, hotplug_trigger))
-			*long_mask |= BIT(i);
-	}
-
-	DRM_DEBUG_DRIVER("hotplug event received, stat 0x%08x, pins 0x%08x\n",
-			 hotplug_trigger, *pin_mask);
-}
-
 static void gmbus_irq_handler(struct drm_device *dev)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
@@ -1547,15 +1520,19 @@ static void i9xx_hpd_irq_handler(struct drm_device *dev)
 	if (IS_G4X(dev) || IS_VALLEYVIEW(dev)) {
 		u32 hotplug_trigger = hotplug_status & HOTPLUG_INT_STATUS_G4X;
 
-		i9xx_get_hpd_pins(&pin_mask, &long_mask, hotplug_trigger, hpd_status_g4x);
+		intel_get_hpd_pins(&pin_mask, &long_mask, hotplug_trigger,
+				   hotplug_trigger, hpd_status_g4x,
+				   i9xx_port_hotplug_long_detect);
 		intel_hpd_irq_handler(dev, pin_mask, long_mask);
 
 		if (hotplug_status & DP_AUX_CHANNEL_MASK_INT_STATUS_G4X)
 			dp_aux_irq_handler(dev);
 	} else {
 		u32 hotplug_trigger = hotplug_status & HOTPLUG_INT_STATUS_I915;
 
-		i9xx_get_hpd_pins(&pin_mask, &long_mask, hotplug_trigger, hpd_status_i915);
+		intel_get_hpd_pins(&pin_mask, &long_mask, hotplug_trigger,
+				   hotplug_trigger, hpd_status_g4x,
+				   i9xx_port_hotplug_long_detect);
 		intel_hpd_irq_handler(dev, pin_mask, long_mask);
 	}
 }
@@ -1662,8 +1639,9 @@ static void ibx_irq_handler(struct drm_device *dev, u32 pch_iir)
 		dig_hotplug_reg = I915_READ(PCH_PORT_HOTPLUG);
 		I915_WRITE(PCH_PORT_HOTPLUG, dig_hotplug_reg);
 
-		pch_get_hpd_pins(&pin_mask, &long_mask, hotplug_trigger,
-				 dig_hotplug_reg, hpd_ibx);
+		intel_get_hpd_pins(&pin_mask, &long_mask, hotplug_trigger,
+				   dig_hotplug_reg, hpd_ibx,
+				   pch_port_hotplug_long_detect);
 		intel_hpd_irq_handler(dev, pin_mask, long_mask);
 	}
 
@@ -1763,8 +1741,10 @@ static void cpt_irq_handler(struct drm_device *dev, u32 pch_iir)
 
 		dig_hotplug_reg = I915_READ(PCH_PORT_HOTPLUG);
 		I915_WRITE(PCH_PORT_HOTPLUG, dig_hotplug_reg);
-		pch_get_hpd_pins(&pin_mask, &long_mask, hotplug_trigger,
-				 dig_hotplug_reg, hpd_cpt);
+
+		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);
 	}
 
@@ -1981,7 +1961,8 @@ static void bxt_hpd_handler(struct drm_device *dev, uint32_t iir_status)
 	/* Clear sticky bits in hpd status */
 	I915_WRITE(BXT_HOTPLUG_CTL, hp_control);
 
-	pch_get_hpd_pins(&pin_mask, &long_mask, hp_trigger, hp_control, hpd_bxt);
+	intel_get_hpd_pins(&pin_mask, &long_mask, hp_trigger, hp_control,
+			   hpd_bxt, pch_port_hotplug_long_detect);
 	intel_hpd_irq_handler(dev, pin_mask, long_mask);
 }