1 files changed, 396 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 000000000..7b946d44a
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/nouveau_acpi.c
@@ -0,0 +1,396 @@
+// SPDX-License-Identifier: MIT
+#include <linux/pci.h>
+#include <linux/acpi.h>
+#include <linux/slab.h>
+#include <linux/mxm-wmi.h>
+#include <linux/vga_switcheroo.h>
+#include <drm/drm_edid.h>
+#include <acpi/video.h>
+
+#include "nouveau_drv.h"
+#include "nouveau_acpi.h"
+
+#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
+
+#define NOUVEAU_DSM_OPTIMUS_CAPS 0x1A
+#define NOUVEAU_DSM_OPTIMUS_FLAGS 0x1B
+
+#define NOUVEAU_DSM_OPTIMUS_POWERDOWN_PS3 (3 << 24)
+#define NOUVEAU_DSM_OPTIMUS_NO_POWERDOWN_PS3 (2 << 24)
+#define NOUVEAU_DSM_OPTIMUS_FLAGS_CHANGED (1)
+
+#define NOUVEAU_DSM_OPTIMUS_SET_POWERDOWN (NOUVEAU_DSM_OPTIMUS_POWERDOWN_PS3 | NOUVEAU_DSM_OPTIMUS_FLAGS_CHANGED)
+
+/* result of the optimus caps function */
+#define OPTIMUS_ENABLED (1 << 0)
+#define OPTIMUS_STATUS_MASK (3 << 3)
+#define OPTIMUS_STATUS_OFF  (0 << 3)
+#define OPTIMUS_STATUS_ON_ENABLED  (1 << 3)
+#define OPTIMUS_STATUS_PWR_STABLE  (3 << 3)
+#define OPTIMUS_DISPLAY_HOTPLUG (1 << 6)
+#define OPTIMUS_CAPS_MASK (7 << 24)
+#define OPTIMUS_DYNAMIC_PWR_CAP (1 << 24)
+
+#define OPTIMUS_AUDIO_CAPS_MASK (3 << 27)
+#define OPTIMUS_HDA_CODEC_MASK (2 << 27) /* hda bios control */
+
+static struct nouveau_dsm_priv {
+	bool dsm_detected;
+	bool optimus_detected;
+	bool optimus_flags_detected;
+	bool optimus_skip_dsm;
+	acpi_handle dhandle;
+} nouveau_dsm_priv;
+
+bool nouveau_is_optimus(void) {
+	return nouveau_dsm_priv.optimus_detected;
+}
+
+bool nouveau_is_v1_dsm(void) {
+	return nouveau_dsm_priv.dsm_detected;
+}
+
+#ifdef CONFIG_VGA_SWITCHEROO
+static const guid_t nouveau_dsm_muid =
+	GUID_INIT(0x9D95A0A0, 0x0060, 0x4D48,
+		  0xB3, 0x4D, 0x7E, 0x5F, 0xEA, 0x12, 0x9F, 0xD4);
+
+static const guid_t nouveau_op_dsm_muid =
+	GUID_INIT(0xA486D8F8, 0x0BDA, 0x471B,
+		  0xA7, 0x2B, 0x60, 0x42, 0xA6, 0xB5, 0xBE, 0xE0);
+
+static int nouveau_optimus_dsm(acpi_handle handle, int func, int arg, uint32_t *result)
+{
+	int i;
+	union acpi_object *obj;
+	char args_buff[4];
+	union acpi_object argv4 = {
+		.buffer.type = ACPI_TYPE_BUFFER,
+		.buffer.length = 4,
+		.buffer.pointer = args_buff
+	};
+
+	/* ACPI is little endian, AABBCCDD becomes {DD,CC,BB,AA} */
+	for (i = 0; i < 4; i++)
+		args_buff[i] = (arg >> i * 8) & 0xFF;
+
+	*result = 0;
+	obj = acpi_evaluate_dsm_typed(handle, &nouveau_op_dsm_muid, 0x00000100,
+				      func, &argv4, ACPI_TYPE_BUFFER);
+	if (!obj) {
+		acpi_handle_info(handle, "failed to evaluate _DSM\n");
+		return AE_ERROR;
+	} else {
+		if (obj->buffer.length == 4) {
+			*result |= obj->buffer.pointer[0];
+			*result |= (obj->buffer.pointer[1] << 8);
+			*result |= (obj->buffer.pointer[2] << 16);
+			*result |= (obj->buffer.pointer[3] << 24);
+		}
+		ACPI_FREE(obj);
+	}
+
+	return 0;
+}
+
+/*
+ * On some platforms, _DSM(nouveau_op_dsm_muid, func0) has special
+ * requirements on the fourth parameter, so a private implementation
+ * instead of using acpi_check_dsm().
+ */
+static int nouveau_dsm_get_optimus_functions(acpi_handle handle)
+{
+	int result;
+
+	/*
+	 * Function 0 returns a Buffer containing available functions.
+	 * The args parameter is ignored for function 0, so just put 0 in it
+	 */
+	if (nouveau_optimus_dsm(handle, 0, 0, &result))
+		return 0;
+
+	/*
+	 * ACPI Spec v4 9.14.1: if bit 0 is zero, no function is supported.
+	 * If the n-th bit is enabled, function n is supported
+	 */
+	if (result & 1 && result & (1 << NOUVEAU_DSM_OPTIMUS_CAPS))
+		return result;
+	return 0;
+}
+
+static int nouveau_dsm(acpi_handle handle, int func, int arg)
+{
+	int ret = 0;
+	union acpi_object *obj;
+	union acpi_object argv4 = {
+		.integer.type = ACPI_TYPE_INTEGER,
+		.integer.value = arg,
+	};
+
+	obj = acpi_evaluate_dsm_typed(handle, &nouveau_dsm_muid, 0x00000102,
+				      func, &argv4, ACPI_TYPE_INTEGER);
+	if (!obj) {
+		acpi_handle_info(handle, "failed to evaluate _DSM\n");
+		return AE_ERROR;
+	} else {
+		if (obj->integer.value == 0x80000002)
+			ret = -ENODEV;
+		ACPI_FREE(obj);
+	}
+
+	return ret;
+}
+
+static int nouveau_dsm_switch_mux(acpi_handle handle, int mux_id)
+{
+	mxm_wmi_call_mxmx(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0);
+	mxm_wmi_call_mxds(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0);
+	return nouveau_dsm(handle, NOUVEAU_DSM_LED, mux_id);
+}
+
+static int nouveau_dsm_set_discrete_state(acpi_handle handle, enum vga_switcheroo_state state)
+{
+	int arg;
+	if (state == VGA_SWITCHEROO_ON)
+		arg = NOUVEAU_DSM_POWER_SPEED;
+	else
+		arg = NOUVEAU_DSM_POWER_STAMINA;
+	nouveau_dsm(handle, NOUVEAU_DSM_POWER, arg);
+	return 0;
+}
+
+static int nouveau_dsm_switchto(enum vga_switcheroo_client_id id)
+{
+	if (!nouveau_dsm_priv.dsm_detected)
+		return 0;
+	if (id == VGA_SWITCHEROO_IGD)
+		return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_STAMINA);
+	else
+		return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_SPEED);
+}
+
+static int nouveau_dsm_power_state(enum vga_switcheroo_client_id id,
+				   enum vga_switcheroo_state state)
+{
+	if (id == VGA_SWITCHEROO_IGD)
+		return 0;
+
+	/* Optimus laptops have the card already disabled in
+	 * nouveau_switcheroo_set_state */
+	if (!nouveau_dsm_priv.dsm_detected)
+		return 0;
+
+	return nouveau_dsm_set_discrete_state(nouveau_dsm_priv.dhandle, state);
+}
+
+static enum vga_switcheroo_client_id nouveau_dsm_get_client_id(struct pci_dev *pdev)
+{
+	/* easy option one - intel vendor ID means Integrated */
+	if (pdev->vendor == PCI_VENDOR_ID_INTEL)
+		return VGA_SWITCHEROO_IGD;
+
+	/* is this device on Bus 0? - this may need improving */
+	if (pdev->bus->number == 0)
+		return VGA_SWITCHEROO_IGD;
+
+	return VGA_SWITCHEROO_DIS;
+}
+
+static const struct vga_switcheroo_handler nouveau_dsm_handler = {
+	.switchto = nouveau_dsm_switchto,
+	.power_state = nouveau_dsm_power_state,
+	.get_client_id = nouveau_dsm_get_client_id,
+};
+
+static void nouveau_dsm_pci_probe(struct pci_dev *pdev, acpi_handle *dhandle_out,
+				  bool *has_mux, bool *has_opt,
+				  bool *has_opt_flags, bool *has_pr3)
+{
+	acpi_handle dhandle;
+	bool supports_mux;
+	int optimus_funcs;
+	struct pci_dev *parent_pdev;
+
+	if (pdev->vendor != PCI_VENDOR_ID_NVIDIA)
+		return;
+
+	*has_pr3 = false;
+	parent_pdev = pci_upstream_bridge(pdev);
+	if (parent_pdev) {
+		if (parent_pdev->bridge_d3)
+			*has_pr3 = pci_pr3_present(parent_pdev);
+		else
+			pci_d3cold_disable(pdev);
+	}
+
+	dhandle = ACPI_HANDLE(&pdev->dev);
+	if (!dhandle)
+		return;
+
+	if (!acpi_has_method(dhandle, "_DSM"))
+		return;
+
+	supports_mux = acpi_check_dsm(dhandle, &nouveau_dsm_muid, 0x00000102,
+				      1 << NOUVEAU_DSM_POWER);
+	optimus_funcs = nouveau_dsm_get_optimus_functions(dhandle);
+
+	/* Does not look like a Nvidia device. */
+	if (!supports_mux && !optimus_funcs)
+		return;
+
+	*dhandle_out = dhandle;
+	*has_mux = supports_mux;
+	*has_opt = !!optimus_funcs;
+	*has_opt_flags = optimus_funcs & (1 << NOUVEAU_DSM_OPTIMUS_FLAGS);
+
+	if (optimus_funcs) {
+		uint32_t result;
+		nouveau_optimus_dsm(dhandle, NOUVEAU_DSM_OPTIMUS_CAPS, 0,
+				    &result);
+		dev_info(&pdev->dev, "optimus capabilities: %s, status %s%s\n",
+			 (result & OPTIMUS_ENABLED) ? "enabled" : "disabled",
+			 (result & OPTIMUS_DYNAMIC_PWR_CAP) ? "dynamic power, " : "",
+			 (result & OPTIMUS_HDA_CODEC_MASK) ? "hda bios codec supported" : "");
+	}
+}
+
+static bool nouveau_dsm_detect(void)
+{
+	char acpi_method_name[255] = { 0 };
+	struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};
+	struct pci_dev *pdev = NULL;
+	acpi_handle dhandle = NULL;
+	bool has_mux = false;
+	bool has_optimus = false;
+	bool has_optimus_flags = false;
+	bool has_power_resources = false;
+	int vga_count = 0;
+	bool guid_valid;
+	bool ret = false;
+
+	/* lookup the MXM GUID */
+	guid_valid = mxm_wmi_supported();
+
+	if (guid_valid)
+		printk("MXM: GUID detected in BIOS\n");
+
+	/* now do DSM detection */
+	while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
+		vga_count++;
+
+		nouveau_dsm_pci_probe(pdev, &dhandle, &has_mux, &has_optimus,
+				      &has_optimus_flags, &has_power_resources);
+	}
+
+	while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_3D << 8, pdev)) != NULL) {
+		vga_count++;
+
+		nouveau_dsm_pci_probe(pdev, &dhandle, &has_mux, &has_optimus,
+				      &has_optimus_flags, &has_power_resources);
+	}
+
+	/* find the optimus DSM or the old v1 DSM */
+	if (has_optimus) {
+		nouveau_dsm_priv.dhandle = dhandle;
+		acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME,
+			&buffer);
+		pr_info("VGA switcheroo: detected Optimus DSM method %s handle\n",
+			acpi_method_name);
+		if (has_power_resources)
+			pr_info("nouveau: detected PR support, will not use DSM\n");
+		nouveau_dsm_priv.optimus_detected = true;
+		nouveau_dsm_priv.optimus_flags_detected = has_optimus_flags;
+		nouveau_dsm_priv.optimus_skip_dsm = has_power_resources;
+		ret = true;
+	} else if (vga_count == 2 && has_mux && guid_valid) {
+		nouveau_dsm_priv.dhandle = dhandle;
+		acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME,
+			&buffer);
+		pr_info("VGA switcheroo: detected DSM switching method %s handle\n",
+			acpi_method_name);
+		nouveau_dsm_priv.dsm_detected = true;
+		ret = true;
+	}
+
+
+	return ret;
+}
+
+void nouveau_register_dsm_handler(void)
+{
+	bool r;
+
+	r = nouveau_dsm_detect();
+	if (!r)
+		return;
+
+	vga_switcheroo_register_handler(&nouveau_dsm_handler, 0);
+}
+
+/* Must be called for Optimus models before the card can be turned off */
+void nouveau_switcheroo_optimus_dsm(void)
+{
+	u32 result = 0;
+	if (!nouveau_dsm_priv.optimus_detected || nouveau_dsm_priv.optimus_skip_dsm)
+		return;
+
+	if (nouveau_dsm_priv.optimus_flags_detected)
+		nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_FLAGS,
+				    0x3, &result);
+
+	nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_CAPS,
+		NOUVEAU_DSM_OPTIMUS_SET_POWERDOWN, &result);
+
+}
+
+void nouveau_unregister_dsm_handler(void)
+{
+	if (nouveau_dsm_priv.optimus_detected || nouveau_dsm_priv.dsm_detected)
+		vga_switcheroo_unregister_handler();
+}
+#else
+void nouveau_register_dsm_handler(void) {}
+void nouveau_unregister_dsm_handler(void) {}
+void nouveau_switcheroo_optimus_dsm(void) {}
+#endif
+
+void *
+nouveau_acpi_edid(struct drm_device *dev, struct drm_connector *connector)
+{
+	struct acpi_device *acpidev;
+	acpi_handle handle;
+	int type, ret;
+	void *edid;
+
+	switch (connector->connector_type) {
+	case DRM_MODE_CONNECTOR_LVDS:
+	case DRM_MODE_CONNECTOR_eDP:
+		type = ACPI_VIDEO_DISPLAY_LCD;
+		break;
+	default:
+		return NULL;
+	}
+
+	handle = ACPI_HANDLE(&dev->pdev->dev);
+	if (!handle)
+		return NULL;
+
+	ret = acpi_bus_get_device(handle, &acpidev);
+	if (ret)
+		return NULL;
+
+	ret = acpi_video_get_edid(acpidev, type, -1, &edid);
+	if (ret < 0)
+		return NULL;
+
+	return kmemdup(edid, EDID_LENGTH, GFP_KERNEL);
+}