drm/i915: SDVO hotplug have different interrupt status bits for i915/i965/g4x

commit 084b612e upstream.

Note that gen3 is the only platform where we've got the bit
definitions right, hence the workaround of disabling sdvo hotplug
support on i945g/gm is not due to misdiagnosis of broken hotplug irq
handling ...
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
[danvet: add some blurb about sdvo hotplug fail on i945g/gm I've
wondered about while reviewing.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
[bwh: Backported to 3.2:
 - Adjust context
 - Handle all three cases in i915_driver_irq_postinstall() as there
   are not separate functions for gen3 and gen4+
 - Carry on using IS_SDVOB() in intel_sdvo_init()]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

drivers/gpu/drm/i915/i915_irq.c

@@ -2006,10 +2006,22 @@ static int i915_driver_irq_postinstall(struct drm_device *dev)
 			hotplug_en |= HDMIC_HOTPLUG_INT_EN;
 		if (dev_priv->hotplug_supported_mask & HDMID_HOTPLUG_INT_STATUS)
 			hotplug_en |= HDMID_HOTPLUG_INT_EN;
-		if (dev_priv->hotplug_supported_mask & SDVOC_HOTPLUG_INT_STATUS)
+		if (IS_G4X(dev)) {
+			if (dev_priv->hotplug_supported_mask & SDVOC_HOTPLUG_INT_STATUS_G4X)
+				hotplug_en |= SDVOC_HOTPLUG_INT_EN;
+			if (dev_priv->hotplug_supported_mask & SDVOB_HOTPLUG_INT_STATUS_G4X)
+				hotplug_en |= SDVOB_HOTPLUG_INT_EN;
+		} else if (IS_GEN4(dev)) {
+			if (dev_priv->hotplug_supported_mask & SDVOC_HOTPLUG_INT_STATUS_I965)
 				hotplug_en |= SDVOC_HOTPLUG_INT_EN;
-		if (dev_priv->hotplug_supported_mask & SDVOB_HOTPLUG_INT_STATUS)
+			if (dev_priv->hotplug_supported_mask & SDVOB_HOTPLUG_INT_STATUS_I965)
 				hotplug_en |= SDVOB_HOTPLUG_INT_EN;
+		} else {
+			if (dev_priv->hotplug_supported_mask & SDVOC_HOTPLUG_INT_STATUS_I915)
+				hotplug_en |= SDVOC_HOTPLUG_INT_EN;
+			if (dev_priv->hotplug_supported_mask & SDVOB_HOTPLUG_INT_STATUS_I915)
+				hotplug_en |= SDVOB_HOTPLUG_INT_EN;
+		}
 		if (dev_priv->hotplug_supported_mask & CRT_HOTPLUG_INT_STATUS) {
 			hotplug_en |= CRT_HOTPLUG_INT_EN;
 

drivers/gpu/drm/i915/i915_reg.h

@@ -1419,14 +1419,20 @@
 #define   DPC_HOTPLUG_INT_STATUS		(1 << 28)
 #define   HDMID_HOTPLUG_INT_STATUS		(1 << 27)
 #define   DPD_HOTPLUG_INT_STATUS		(1 << 27)
+/* CRT/TV common between gen3+ */
 #define   CRT_HOTPLUG_INT_STATUS		(1 << 11)
 #define   TV_HOTPLUG_INT_STATUS			(1 << 10)
 #define   CRT_HOTPLUG_MONITOR_MASK		(3 << 8)
 #define   CRT_HOTPLUG_MONITOR_COLOR		(3 << 8)
 #define   CRT_HOTPLUG_MONITOR_MONO		(2 << 8)
 #define   CRT_HOTPLUG_MONITOR_NONE		(0 << 8)
-#define   SDVOC_HOTPLUG_INT_STATUS		(1 << 7)
-#define   SDVOB_HOTPLUG_INT_STATUS		(1 << 6)
+/* SDVO is different across gen3/4 */
+#define   SDVOC_HOTPLUG_INT_STATUS_G4X		(1 << 3)
+#define   SDVOB_HOTPLUG_INT_STATUS_G4X		(1 << 2)
+#define   SDVOC_HOTPLUG_INT_STATUS_I965		(3 << 4)
+#define   SDVOB_HOTPLUG_INT_STATUS_I965		(3 << 2)
+#define   SDVOC_HOTPLUG_INT_STATUS_I915		(1 << 7)
+#define   SDVOB_HOTPLUG_INT_STATUS_I915		(1 << 6)
 
 /* SDVO port control */
 #define SDVOB			0x61140

drivers/gpu/drm/i915/intel_sdvo.c

@@ -2514,6 +2514,7 @@ bool intel_sdvo_init(struct drm_device *dev, int sdvo_reg)
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	struct intel_encoder *intel_encoder;
 	struct intel_sdvo *intel_sdvo;
+	u32 hotplug_mask;
 	int i;
 
 	intel_sdvo = kzalloc(sizeof(struct intel_sdvo), GFP_KERNEL);
@@ -2544,10 +2545,18 @@ bool intel_sdvo_init(struct drm_device *dev, int sdvo_reg)
 		}
 	}
 
-	if (IS_SDVOB(sdvo_reg))
-		dev_priv->hotplug_supported_mask |= SDVOB_HOTPLUG_INT_STATUS;
-	else
-		dev_priv->hotplug_supported_mask |= SDVOC_HOTPLUG_INT_STATUS;
+	hotplug_mask = 0;
+	if (IS_G4X(dev)) {
+		hotplug_mask = IS_SDVOB(sdvo_reg) ?
+			SDVOB_HOTPLUG_INT_STATUS_G4X : SDVOC_HOTPLUG_INT_STATUS_G4X;
+	} else if (IS_GEN4(dev)) {
+		hotplug_mask = IS_SDVOB(sdvo_reg) ?
+			SDVOB_HOTPLUG_INT_STATUS_I965 : SDVOC_HOTPLUG_INT_STATUS_I965;
+	} else {
+		hotplug_mask = IS_SDVOB(sdvo_reg) ?
+			SDVOB_HOTPLUG_INT_STATUS_I915 : SDVOC_HOTPLUG_INT_STATUS_I915;
+	}
+	dev_priv->hotplug_supported_mask |= hotplug_mask;
 
 	drm_encoder_helper_add(&intel_encoder->base, &intel_sdvo_helper_funcs);