MFC 270516:

i915 driver - enable opregion handle; program CADL.

add opregion handling for drm2 - which exposes some ACPI video configuration
pieces that some Lenovo laptop models use to flesh out which video device
to speak to.  This enables the brightness control in ACPI to work these models.

The CADL bits are also important - it's used to figure out which ACPI
events to hook the brightness buttons into.  It doesn't yet seem to work
for me, but it does for the OP.

PR:		190186, 198551
Submitted by:	Henry Hu <henry.hu.sh@gmail.com>

3 files changed, 82 insertions, 31 deletions

diff --git a/sys/dev/drm2/i915/i915_drv.h b/sys/dev/drm2/i915/i915_drv.h
index 2cf1eae..b84f4f3 100644
--- a/sys/dev/drm2/i915/i915_drv.h
+++ b/sys/dev/drm2/i915/i915_drv.h
@@ -1277,10 +1277,11 @@ extern void intel_iic_reset(struct drm_device *dev);
 
 /* intel_opregion.c */
 int intel_opregion_setup(struct drm_device *dev);
-extern int intel_opregion_init(struct drm_device *dev);
+extern void intel_opregion_init(struct drm_device *dev);
 extern void intel_opregion_fini(struct drm_device *dev);
-extern void opregion_asle_intr(struct drm_device *dev);
-extern void opregion_enable_asle(struct drm_device *dev);
+extern void intel_opregion_asle_intr(struct drm_device *dev);
+extern void intel_opregion_gse_intr(struct drm_device *dev);
+extern void intel_opregion_enable_asle(struct drm_device *dev);
 
 /* i915_gem_gtt.c */
 int i915_gem_init_aliasing_ppgtt(struct drm_device *dev);
diff --git a/sys/dev/drm2/i915/i915_irq.c b/sys/dev/drm2/i915/i915_irq.c
index edae487..15d0a61 100644
--- a/sys/dev/drm2/i915/i915_irq.c
+++ b/sys/dev/drm2/i915/i915_irq.c
@@ -537,11 +537,7 @@ ivybridge_irq_handler(void *arg)
 		notify_ring(dev, &dev_priv->rings[BCS]);
 
 	if (de_iir & DE_GSE_IVB) {
-#if 1
-		KIB_NOTYET();
-#else
 		intel_opregion_gse_intr(dev);
-#endif
 	}
 
 	if (de_iir & DE_PLANEA_FLIP_DONE_IVB) {
@@ -649,11 +645,7 @@ ironlake_irq_handler(void *arg)
 		notify_ring(dev, &dev_priv->rings[BCS]);
 
 	if (de_iir & DE_GSE) {
-#if 1
-		KIB_NOTYET();
-#else
 		intel_opregion_gse_intr(dev);
-#endif
 	}
 
 	if (de_iir & DE_PLANEA_FLIP_DONE) {
@@ -1055,11 +1047,7 @@ i915_driver_irq_handler(void *arg)
 
 
 		if (blc_event || (iir & I915_ASLE_INTERRUPT)) {
-#if 1
-			KIB_NOTYET();
-#else
 			intel_opregion_asle_intr(dev);
-#endif
 		}
 
 		/* With MSI, interrupts are only generated when iir
@@ -1781,11 +1769,7 @@ i915_driver_irq_postinstall(struct drm_device *dev)
 		I915_WRITE(PORT_HOTPLUG_EN, hotplug_en);
 	}
 
-#if 1
-	KIB_NOTYET();
-#else
 	intel_opregion_enable_asle(dev);
-#endif
 
 	return 0;
 }
diff --git a/sys/dev/drm2/i915/intel_opregion.c b/sys/dev/drm2/i915/intel_opregion.c
index 8229c30..7b02f71 100644
--- a/sys/dev/drm2/i915/intel_opregion.c
+++ b/sys/dev/drm2/i915/intel_opregion.c
@@ -32,6 +32,9 @@ __FBSDID("$FreeBSD$");
 #include <dev/drm2/i915/i915_drm.h>
 #include <dev/drm2/i915/i915_drv.h>
 #include <dev/drm2/i915/intel_drv.h>
+#include <contrib/dev/acpica/include/acpi.h>
+#include <contrib/dev/acpica/include/accommon.h>
+#include <dev/acpica/acpivar.h>
 
 #define PCI_ASLE 0xe4
 #define PCI_ASLS 0xfc
@@ -144,7 +147,7 @@ struct opregion_asle {
 #define ACPI_DIGITAL_OUTPUT (3<<8)
 #define ACPI_LVDS_OUTPUT (4<<8)
 
-#ifdef CONFIG_ACPI
+#if 1
 static u32 asle_set_backlight(struct drm_device *dev, u32 bclp)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
@@ -289,6 +292,7 @@ void intel_opregion_enable_asle(struct drm_device *dev)
 
 static struct intel_opregion *system_opregion;
 
+#if 0
 static int intel_opregion_video_event(struct notifier_block *nb,
 				      unsigned long val, void *data)
 {
@@ -319,6 +323,7 @@ static int intel_opregion_video_event(struct notifier_block *nb,
 static struct notifier_block intel_opregion_notifier = {
 	.notifier_call = intel_opregion_video_event,
 };
+#endif
 
 /*
  * Initialise the DIDL field in opregion. This passes a list of devices to
@@ -326,37 +331,72 @@ static struct notifier_block intel_opregion_notifier = {
  * (version 3)
  */
 
+static int acpi_is_video_device(ACPI_HANDLE devh) {
+	ACPI_HANDLE h;
+	if (ACPI_FAILURE(AcpiGetHandle(devh, "_DOD", &h)) ||
+		ACPI_FAILURE(AcpiGetHandle(devh, "_DOS", &h))) {
+		return 0;
+	}
+	return 1;
+}
+
 static void intel_didl_outputs(struct drm_device *dev)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	struct intel_opregion *opregion = &dev_priv->opregion;
 	struct drm_connector *connector;
-	acpi_handle handle;
-	struct acpi_device *acpi_dev, *acpi_cdev, *acpi_video_bus = NULL;
-	unsigned long long device_id;
-	acpi_status status;
+	u32 device_id;
+	ACPI_HANDLE handle, acpi_video_bus, acpi_cdev;
+	ACPI_STATUS status;
 	int i = 0;
 
-	handle = DEVICE_ACPI_HANDLE(&dev->pdev->dev);
-	if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &acpi_dev)))
+	handle = acpi_get_handle(dev->device);
+	if (!handle)
 		return;
 
-	if (acpi_is_video_device(acpi_dev))
-		acpi_video_bus = acpi_dev;
+	if (acpi_is_video_device(handle))
+		acpi_video_bus = handle;
 	else {
+		acpi_cdev = NULL;
+		acpi_video_bus = NULL;
+		while (AcpiGetNextObject(ACPI_TYPE_DEVICE, handle, acpi_cdev,
+					&acpi_cdev) != AE_NOT_FOUND) {
+			if (acpi_is_video_device(acpi_cdev)) {
+				acpi_video_bus = acpi_cdev;
+				break;
+			}
+		}
+#if 0
 		list_for_each_entry(acpi_cdev, &acpi_dev->children, node) {
 			if (acpi_is_video_device(acpi_cdev)) {
 				acpi_video_bus = acpi_cdev;
 				break;
 			}
 		}
+#endif
 	}
 
 	if (!acpi_video_bus) {
-		printk(KERN_WARNING "No ACPI video bus found\n");
+		device_printf(dev->device, "No ACPI video bus found\n");
 		return;
 	}
 
+	acpi_cdev = NULL;
+	while (AcpiGetNextObject(ACPI_TYPE_DEVICE, acpi_video_bus, acpi_cdev,
+				&acpi_cdev) != AE_NOT_FOUND) {
+		if (i >= 8) {
+			device_printf(dev->device, "More than 8 outputs detected\n");
+			return;
+		}
+		status = acpi_GetInteger(acpi_cdev, "_ADR", &device_id);
+		if (ACPI_SUCCESS(status)) {
+			if (!device_id)
+				goto blind_set;
+			opregion->acpi->didl[i] = (u32)(device_id & 0x0f0f);
+			i++;
+		}
+	}
+#if 0
 	list_for_each_entry(acpi_cdev, &acpi_video_bus->children, node) {
 		if (i >= 8) {
 			dev_printk(KERN_ERR, &dev->pdev->dev,
@@ -373,6 +413,7 @@ static void intel_didl_outputs(struct drm_device *dev)
 			i++;
 		}
 	}
+#endif
 
 end:
 	/* If fewer than 8 outputs, the list must be null terminated */
@@ -417,6 +458,25 @@ blind_set:
 	goto end;
 }
 
+static void intel_setup_cadls(struct drm_device *dev)
+{
+	struct drm_i915_private *dev_priv = dev->dev_private;
+	struct intel_opregion *opregion = &dev_priv->opregion;
+	int i = 0;
+	u32 disp_id;
+
+	/* Initialize the CADL field by duplicating the DIDL values.
+	 * Technically, this is not always correct as display outputs may exist,
+	 * but not active. This initialization is necessary for some Clevo
+	 * laptops that check this field before processing the brightness and
+	 * display switching hotkeys. Just like DIDL, CADL is NULL-terminated if
+	 * there are less than eight devices. */
+	do {
+		disp_id = opregion->acpi->didl[i];
+		opregion->acpi->cadl[i] = disp_id;
+	} while (++i < 8 && disp_id != 0);
+}
+
 void intel_opregion_init(struct drm_device *dev)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
@@ -426,8 +486,10 @@ void intel_opregion_init(struct drm_device *dev)
 		return;
 
 	if (opregion->acpi) {
-		if (drm_core_check_feature(dev, DRIVER_MODESET))
+		if (drm_core_check_feature(dev, DRIVER_MODESET)) {
 			intel_didl_outputs(dev);
+			intel_setup_cadls(dev);
+		}
 
 		/* Notify BIOS we are ready to handle ACPI video ext notifs.
 		 * Right now, all the events are handled by the ACPI video module.
@@ -436,7 +498,9 @@ void intel_opregion_init(struct drm_device *dev)
 		opregion->acpi->drdy = 1;
 
 		system_opregion = opregion;
+#if 0
 		register_acpi_notifier(&intel_opregion_notifier);
+#endif
 	}
 
 	if (opregion->asle)
@@ -455,11 +519,13 @@ void intel_opregion_fini(struct drm_device *dev)
 		opregion->acpi->drdy = 0;
 
 		system_opregion = NULL;
+#if 0
 		unregister_acpi_notifier(&intel_opregion_notifier);
+#endif
 	}
 
 	/* just clear all opregion memory pointers now */
-	iounmap(opregion->header);
+	pmap_unmapdev((vm_offset_t)opregion->header, OPREGION_SIZE);
 	opregion->header = NULL;
 	opregion->acpi = NULL;
 	opregion->swsci = NULL;