1 files changed, 125 insertions, 0 deletions
diff --git a/drivers/gpu/drm/nouveau/nouveau_acpi.c b/drivers/gpu/drm/nouveau/nouveau_acpi.c
new file mode 100644
index 000000000000..1cf488247a16
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/nouveau_acpi.c
@@ -0,0 +1,125 @@
+#include <linux/pci.h>
+#include <linux/acpi.h>
+#include <acpi/acpi_drivers.h>
+#include <acpi/acpi_bus.h>
+
+#include "drmP.h"
+#include "drm.h"
+#include "drm_sarea.h"
+#include "drm_crtc_helper.h"
+#include "nouveau_drv.h"
+#include "nouveau_drm.h"
+#include "nv50_display.h"
+
+#define NOUVEAU_DSM_SUPPORTED 0x00
+#define NOUVEAU_DSM_SUPPORTED_FUNCTIONS 0x00
+
+#define NOUVEAU_DSM_ACTIVE 0x01
+#define NOUVEAU_DSM_ACTIVE_QUERY 0x00
+
+#define NOUVEAU_DSM_LED 0x02
+#define NOUVEAU_DSM_LED_STATE 0x00
+#define NOUVEAU_DSM_LED_OFF 0x10
+#define NOUVEAU_DSM_LED_STAMINA 0x11
+#define NOUVEAU_DSM_LED_SPEED 0x12
+
+#define NOUVEAU_DSM_POWER 0x03
+#define NOUVEAU_DSM_POWER_STATE 0x00
+#define NOUVEAU_DSM_POWER_SPEED 0x01
+#define NOUVEAU_DSM_POWER_STAMINA 0x02
+
+static int nouveau_dsm(struct drm_device *dev, int func, int arg, int *result)
+{
+	static char muid[] = {
+		0xA0, 0xA0, 0x95, 0x9D, 0x60, 0x00, 0x48, 0x4D,
+		0xB3, 0x4D, 0x7E, 0x5F, 0xEA, 0x12, 0x9F, 0xD4,
+	};
+
+	struct pci_dev *pdev = dev->pdev;
+	struct acpi_handle *handle;
+	struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
+	struct acpi_object_list input;
+	union acpi_object params[4];
+	union acpi_object *obj;
+	int err;
+
+	handle = DEVICE_ACPI_HANDLE(&pdev->dev);
+
+	if (!handle)
+		return -ENODEV;
+
+	input.count = 4;
+	input.pointer = params;
+	params[0].type = ACPI_TYPE_BUFFER;
+	params[0].buffer.length = sizeof(muid);
+	params[0].buffer.pointer = (char *)muid;
+	params[1].type = ACPI_TYPE_INTEGER;
+	params[1].integer.value = 0x00000102;
+	params[2].type = ACPI_TYPE_INTEGER;
+	params[2].integer.value = func;
+	params[3].type = ACPI_TYPE_INTEGER;
+	params[3].integer.value = arg;
+
+	err = acpi_evaluate_object(handle, "_DSM", &input, &output);
+	if (err) {
+		NV_INFO(dev, "failed to evaluate _DSM: %d\n", err);
+		return err;
+	}
+
+	obj = (union acpi_object *)output.pointer;
+
+	if (obj->type == ACPI_TYPE_INTEGER)
+		if (obj->integer.value == 0x80000002)
+			return -ENODEV;
+
+	if (obj->type == ACPI_TYPE_BUFFER) {
+		if (obj->buffer.length == 4 && result) {
+			*result = 0;
+			*result |= obj->buffer.pointer[0];
+			*result |= (obj->buffer.pointer[1] << 8);
+			*result |= (obj->buffer.pointer[2] << 16);
+			*result |= (obj->buffer.pointer[3] << 24);
+		}
+	}
+
+	kfree(output.pointer);
+	return 0;
+}
+
+int nouveau_hybrid_setup(struct drm_device *dev)
+{
+	int result;
+
+	if (nouveau_dsm(dev, NOUVEAU_DSM_ACTIVE, NOUVEAU_DSM_ACTIVE_QUERY,
+								&result))
+		return -ENODEV;
+
+	NV_INFO(dev, "_DSM hardware status gave 0x%x\n", result);
+
+	if (result & 0x1) {	/* Stamina mode - disable the external GPU */
+		nouveau_dsm(dev, NOUVEAU_DSM_LED, NOUVEAU_DSM_LED_STAMINA,
+									NULL);
+		nouveau_dsm(dev, NOUVEAU_DSM_POWER, NOUVEAU_DSM_POWER_STAMINA,
+									NULL);
+	} else {		/* Ensure that the external GPU is enabled */
+		nouveau_dsm(dev, NOUVEAU_DSM_LED, NOUVEAU_DSM_LED_SPEED, NULL);
+		nouveau_dsm(dev, NOUVEAU_DSM_POWER, NOUVEAU_DSM_POWER_SPEED,
+									NULL);
+	}
+
+	return 0;
+}
+
+bool nouveau_dsm_probe(struct drm_device *dev)
+{
+	int support = 0;
+
+	if (nouveau_dsm(dev, NOUVEAU_DSM_SUPPORTED,
+				NOUVEAU_DSM_SUPPORTED_FUNCTIONS, &support))
+		return false;
+
+	if (!support)
+		return false;
+
+	return true;
+}