drm/i915: enable kernel modesetting on IGDNG

This adds kernel mode setting on IGDNG with VGA output support.
Note that suspend/resume doesn't work yet.
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
Signed-off-by: Eric Anholt <eric@anholt.net>

drivers/gpu/drm/i915/i915_dma.c

@@ -922,7 +922,7 @@ static int i915_probe_agp(struct drm_device *dev, unsigned long *aperture_size,
 	 * Some of the preallocated space is taken by the GTT
 	 * and popup.  GTT is 1K per MB of aperture size, and popup is 4K.
 	 */
-	if (IS_G4X(dev) || IS_IGD(dev))
+	if (IS_G4X(dev) || IS_IGD(dev) || IS_IGDNG(dev))
 		overhead = 4096;
 	else
 		overhead = (*aperture_size / 1024) + 4096;

drivers/gpu/drm/i915/intel_crt.c

@@ -37,9 +37,14 @@ static void intel_crt_dpms(struct drm_encoder *encoder, int mode)
 {
 	struct drm_device *dev = encoder->dev;
 	struct drm_i915_private *dev_priv = dev->dev_private;
-	u32 temp;
+	u32 temp, reg;
 
-	temp = I915_READ(ADPA);
+	if (IS_IGDNG(dev))
+		reg = PCH_ADPA;
+	else
+		reg = ADPA;
+
+	temp = I915_READ(reg);
 	temp &= ~(ADPA_HSYNC_CNTL_DISABLE | ADPA_VSYNC_CNTL_DISABLE);
 	temp |= ADPA_DAC_ENABLE;
 
@@ -58,7 +63,7 @@ static void intel_crt_dpms(struct drm_encoder *encoder, int mode)
 		break;
 	}
 
-	I915_WRITE(ADPA, temp);
+	I915_WRITE(reg, temp);
 }
 
 static int intel_crt_mode_valid(struct drm_connector *connector,
@@ -101,17 +106,23 @@ static void intel_crt_mode_set(struct drm_encoder *encoder,
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	int dpll_md_reg;
 	u32 adpa, dpll_md;
+	u32 adpa_reg;
 
 	if (intel_crtc->pipe == 0)
 		dpll_md_reg = DPLL_A_MD;
 	else
 		dpll_md_reg = DPLL_B_MD;
 
+	if (IS_IGDNG(dev))
+		adpa_reg = PCH_ADPA;
+	else
+		adpa_reg = ADPA;
+
 	/*
 	 * Disable separate mode multiplier used when cloning SDVO to CRT
 	 * XXX this needs to be adjusted when we really are cloning
 	 */
-	if (IS_I965G(dev)) {
+	if (IS_I965G(dev) && !IS_IGDNG(dev)) {
 		dpll_md = I915_READ(dpll_md_reg);
 		I915_WRITE(dpll_md_reg,
 			   dpll_md & ~DPLL_MD_UDI_MULTIPLIER_MASK);
@@ -125,13 +136,53 @@ static void intel_crt_mode_set(struct drm_encoder *encoder,
 
 	if (intel_crtc->pipe == 0) {
 		adpa |= ADPA_PIPE_A_SELECT;
+		if (!IS_IGDNG(dev))
 			I915_WRITE(BCLRPAT_A, 0);
 	} else {
 		adpa |= ADPA_PIPE_B_SELECT;
+		if (!IS_IGDNG(dev))
 			I915_WRITE(BCLRPAT_B, 0);
 	}
 
-	I915_WRITE(ADPA, adpa);
+	I915_WRITE(adpa_reg, adpa);
+}
+
+static bool intel_igdng_crt_detect_hotplug(struct drm_connector *connector)
+{
+	struct drm_device *dev = connector->dev;
+	struct drm_i915_private *dev_priv = dev->dev_private;
+	u32 adpa, temp;
+	bool ret;
+
+	temp = adpa = I915_READ(PCH_ADPA);
+
+	adpa &= ~ADPA_CRT_HOTPLUG_MASK;
+
+	adpa |= (ADPA_CRT_HOTPLUG_PERIOD_128 |
+			ADPA_CRT_HOTPLUG_WARMUP_10MS |
+			ADPA_CRT_HOTPLUG_SAMPLE_4S |
+			ADPA_CRT_HOTPLUG_VOLTAGE_50 | /* default */
+			ADPA_CRT_HOTPLUG_VOLREF_325MV |
+			ADPA_CRT_HOTPLUG_ENABLE |
+			ADPA_CRT_HOTPLUG_FORCE_TRIGGER);
+
+	DRM_DEBUG("pch crt adpa 0x%x", adpa);
+	I915_WRITE(PCH_ADPA, adpa);
+
+	/* This might not be needed as not specified in spec...*/
+	udelay(1000);
+
+	/* Check the status to see if both blue and green are on now */
+	adpa = I915_READ(PCH_ADPA);
+	if ((adpa & ADPA_CRT_HOTPLUG_MONITOR_MASK) ==
+			ADPA_CRT_HOTPLUG_MONITOR_COLOR)
+		ret = true;
+	else
+		ret = false;
+
+	/* restore origin register */
+	I915_WRITE(PCH_ADPA, temp);
+	return ret;
 }
 
 /**
@@ -148,6 +199,10 @@ static bool intel_crt_detect_hotplug(struct drm_connector *connector)
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	u32 hotplug_en;
 	int i, tries = 0;
+
+	if (IS_IGDNG(dev))
+		return intel_igdng_crt_detect_hotplug(connector);
+
 	/*
 	 * On 4 series desktop, CRT detect sequence need to be done twice
 	 * to get a reliable result.
@@ -427,6 +482,7 @@ void intel_crt_init(struct drm_device *dev)
 {
 	struct drm_connector *connector;
 	struct intel_output *intel_output;
+	u32 i2c_reg;
 
 	intel_output = kzalloc(sizeof(struct intel_output), GFP_KERNEL);
 	if (!intel_output)
@@ -443,7 +499,11 @@ void intel_crt_init(struct drm_device *dev)
 					  &intel_output->enc);
 
 	/* Set up the DDC bus. */
-	intel_output->ddc_bus = intel_i2c_create(dev, GPIOA, "CRTDDC_A");
+	if (IS_IGDNG(dev))
+		i2c_reg = PCH_GPIOA;
+	else
+		i2c_reg = GPIOA;
+	intel_output->ddc_bus = intel_i2c_create(dev, i2c_reg, "CRTDDC_A");
 	if (!intel_output->ddc_bus) {
 		dev_printk(KERN_ERR, &dev->pdev->dev, "DDC bus registration "
 			   "failed.\n");