[deliverable/linux.git] / drivers / gpu / drm / nouveau / nouveau_acpi.c

#include <linux/pci.h>
#include <linux/acpi.h>
#include <linux/slab.h>
#include <acpi/acpi_drivers.h>
#include <acpi/acpi_bus.h>
#include <acpi/video.h>
#include <acpi/acpi.h>
#include <linux/mxm-wmi.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 "nouveau_connector.h"

#include <linux/vga_switcheroo.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_FN 0x1A
#define NOUVEAU_DSM_OPTIMUS_ARGS 0x03000001

static struct nouveau_dsm_priv {
	bool dsm_detected;
	bool optimus_detected;
	acpi_handle dhandle;
	acpi_handle rom_handle;
} nouveau_dsm_priv;

#define NOUVEAU_DSM_HAS_MUX 0x1
#define NOUVEAU_DSM_HAS_OPT 0x2

static const char nouveau_dsm_muid[] = {
	0xA0, 0xA0, 0x95, 0x9D, 0x60, 0x00, 0x48, 0x4D,
	0xB3, 0x4D, 0x7E, 0x5F, 0xEA, 0x12, 0x9F, 0xD4,
};

static const char nouveau_op_dsm_muid[] = {
	0xF8, 0xD8, 0x86, 0xA4, 0xDA, 0x0B, 0x1B, 0x47,
	0xA7, 0x2B, 0x60, 0x42, 0xA6, 0xB5, 0xBE, 0xE0,
};

static int nouveau_optimus_dsm(acpi_handle handle, int func, int arg, uint32_t *result)
{
	struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
	struct acpi_object_list input;
	union acpi_object params[4];
	union acpi_object *obj;
	int i, err;
	char args_buff[4];

	input.count = 4;
	input.pointer = params;
	params[0].type = ACPI_TYPE_BUFFER;
	params[0].buffer.length = sizeof(nouveau_op_dsm_muid);
	params[0].buffer.pointer = (char *)nouveau_op_dsm_muid;
	params[1].type = ACPI_TYPE_INTEGER;
	params[1].integer.value = 0x00000100;
	params[2].type = ACPI_TYPE_INTEGER;
	params[2].integer.value = func;
	params[3].type = ACPI_TYPE_BUFFER;
	params[3].buffer.length = 4;
	/* ACPI is little endian, AABBCCDD becomes {DD,CC,BB,AA} */
	for (i = 0; i < 4; i++)
		args_buff[i] = (arg >> i * 8) & 0xFF;
	params[3].buffer.pointer = args_buff;

	err = acpi_evaluate_object(handle, "_DSM", &input, &output);
	if (err) {
		printk(KERN_INFO "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;
}

static int nouveau_dsm(acpi_handle handle, int func, int arg, uint32_t *result)
{
	struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
	struct acpi_object_list input;
	union acpi_object params[4];
	union acpi_object *obj;
	int err;

	input.count = 4;
	input.pointer = params;
	params[0].type = ACPI_TYPE_BUFFER;
	params[0].buffer.length = sizeof(nouveau_dsm_muid);
	params[0].buffer.pointer = (char *)nouveau_dsm_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) {
		printk(KERN_INFO "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;
}

/* Returns 1 if a DSM function is usable and 0 otherwise */
static int nouveau_test_dsm(acpi_handle test_handle,
	int (*dsm_func)(acpi_handle, int, int, uint32_t *),
	int sfnc)
{
	u32 result = 0;

	/* Function 0 returns a Buffer containing available functions. The args
	 * parameter is ignored for function 0, so just put 0 in it */
	if (dsm_func(test_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 */
	return result & 1 && result & (1 << sfnc);
}

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, NULL);
}

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, NULL);
	return 0;
}

static int nouveau_dsm_switchto(enum vga_switcheroo_client_id id)
{
	/* perhaps the _DSM functions are mutually exclusive, but prepare for
	 * the future */
	if (!nouveau_dsm_priv.dsm_detected && nouveau_dsm_priv.optimus_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 && nouveau_dsm_priv.optimus_detected)
		return 0;

	return nouveau_dsm_set_discrete_state(nouveau_dsm_priv.dhandle, state);
}

static int 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 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 int nouveau_dsm_pci_probe(struct pci_dev *pdev)
{
	acpi_handle dhandle, nvidia_handle;
	acpi_status status;
	int retval = 0;

	dhandle = DEVICE_ACPI_HANDLE(&pdev->dev);
	if (!dhandle)
		return false;

	status = acpi_get_handle(dhandle, "_DSM", &nvidia_handle);
	if (ACPI_FAILURE(status)) {
		return false;
	}

	if (nouveau_test_dsm(dhandle, nouveau_dsm, NOUVEAU_DSM_POWER))
		retval |= NOUVEAU_DSM_HAS_MUX;

	if (nouveau_test_dsm(dhandle, nouveau_optimus_dsm,
		NOUVEAU_DSM_OPTIMUS_FN))
		retval |= NOUVEAU_DSM_HAS_OPT;

	if (retval)
		nouveau_dsm_priv.dhandle = dhandle;

	return retval;
}

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;
	int has_dsm = 0;
	int has_optimus = 0;
	int vga_count = 0;
	bool guid_valid;
	int retval;
	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++;

		retval = nouveau_dsm_pci_probe(pdev);
		if (retval & NOUVEAU_DSM_HAS_MUX)
			has_dsm |= 1;
		if (retval & NOUVEAU_DSM_HAS_OPT)
			has_optimus = 1;
	}

	if (vga_count == 2 && has_dsm && guid_valid) {
		acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME,
			&buffer);
		printk(KERN_INFO "VGA switcheroo: detected DSM switching method %s handle\n",
			acpi_method_name);
		nouveau_dsm_priv.dsm_detected = true;
		ret = true;
	}

	if (has_optimus == 1) {
		acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME,
			&buffer);
		printk(KERN_INFO "VGA switcheroo: detected Optimus DSM method %s handle\n",
			acpi_method_name);
		nouveau_dsm_priv.optimus_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);
}

/* 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)
		return;

	nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_FN,
		NOUVEAU_DSM_OPTIMUS_ARGS, &result);
}

void nouveau_unregister_dsm_handler(void)
{
	if (nouveau_dsm_priv.optimus_detected || nouveau_dsm_priv.dsm_detected)
		vga_switcheroo_unregister_handler();
}

/* retrieve the ROM in 4k blocks */
static int nouveau_rom_call(acpi_handle rom_handle, uint8_t *bios,
			    int offset, int len)
{
	acpi_status status;
	union acpi_object rom_arg_elements[2], *obj;
	struct acpi_object_list rom_arg;
	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL};

	rom_arg.count = 2;
	rom_arg.pointer = &rom_arg_elements[0];

	rom_arg_elements[0].type = ACPI_TYPE_INTEGER;
	rom_arg_elements[0].integer.value = offset;

	rom_arg_elements[1].type = ACPI_TYPE_INTEGER;
	rom_arg_elements[1].integer.value = len;

	status = acpi_evaluate_object(rom_handle, NULL, &rom_arg, &buffer);
	if (ACPI_FAILURE(status)) {
		printk(KERN_INFO "failed to evaluate ROM got %s\n", acpi_format_exception(status));
		return -ENODEV;
	}
	obj = (union acpi_object *)buffer.pointer;
	memcpy(bios+offset, obj->buffer.pointer, len);
	kfree(buffer.pointer);
	return len;
}

bool nouveau_acpi_rom_supported(struct pci_dev *pdev)
{
	acpi_status status;
	acpi_handle dhandle, rom_handle;

	if (!nouveau_dsm_priv.dsm_detected && !nouveau_dsm_priv.optimus_detected)
		return false;

	dhandle = DEVICE_ACPI_HANDLE(&pdev->dev);
	if (!dhandle)
		return false;

	status = acpi_get_handle(dhandle, "_ROM", &rom_handle);
	if (ACPI_FAILURE(status))
		return false;

	nouveau_dsm_priv.rom_handle = rom_handle;
	return true;
}

int nouveau_acpi_get_bios_chunk(uint8_t *bios, int offset, int len)
{
	return nouveau_rom_call(nouveau_dsm_priv.rom_handle, bios, offset, len);
}

int
nouveau_acpi_edid(struct drm_device *dev, struct drm_connector *connector)
{
	struct nouveau_connector *nv_connector = nouveau_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 -EINVAL;
	}

	handle = DEVICE_ACPI_HANDLE(&dev->pdev->dev);
	if (!handle)
		return -ENODEV;

	ret = acpi_bus_get_device(handle, &acpidev);
	if (ret)
		return -ENODEV;

	ret = acpi_video_get_edid(acpidev, type, -1, &edid);
	if (ret < 0)
		return ret;

	nv_connector->edid = kmemdup(edid, EDID_LENGTH, GFP_KERNEL);
	return 0;
}
Commit	Line	Data
6ee73861 BS	1	#include <linux/pci.h>
6ee73861 BS	2	#include <linux/acpi.h>
5a0e3ad6	3	#include <linux/slab.h>
6ee73861 BS	4	#include <acpi/acpi_drivers.h>
6ee73861 BS	5	#include <acpi/acpi_bus.h>
a6ed76d7	6	#include <acpi/video.h>
8116188f DA	7	#include <acpi/acpi.h>
8116188f DA	8	#include <linux/mxm-wmi.h>
6ee73861 BS	9
	10	#include "drmP.h"
	11	#include "drm.h"
	12	#include "drm_sarea.h"
	13	#include "drm_crtc_helper.h"
	14	#include "nouveau_drv.h"
94580299	15	#include <nouveau_drm.h>
a6ed76d7	16	#include "nouveau_connector.h"
6ee73861	17
6a9ee8af DA	18	#include <linux/vga_switcheroo.h>
6a9ee8af DA	19
6ee73861 BS	20	#define NOUVEAU_DSM_LED 0x02
	21	#define NOUVEAU_DSM_LED_STATE 0x00
	22	#define NOUVEAU_DSM_LED_OFF 0x10
	23	#define NOUVEAU_DSM_LED_STAMINA 0x11
	24	#define NOUVEAU_DSM_LED_SPEED 0x12
	25
	26	#define NOUVEAU_DSM_POWER 0x03
	27	#define NOUVEAU_DSM_POWER_STATE 0x00
	28	#define NOUVEAU_DSM_POWER_SPEED 0x01
	29	#define NOUVEAU_DSM_POWER_STAMINA 0x02
	30
9075e85f	31	#define NOUVEAU_DSM_OPTIMUS_FN 0x1A
d099230c PL	32	#define NOUVEAU_DSM_OPTIMUS_ARGS 0x03000001
d099230c PL	33
6a9ee8af DA	34	static struct nouveau_dsm_priv {
6a9ee8af DA	35	bool dsm_detected;
f19467c5	36	bool optimus_detected;
6a9ee8af	37	acpi_handle dhandle;
afeb3e11	38	acpi_handle rom_handle;
6a9ee8af DA	39	} nouveau_dsm_priv;
6a9ee8af DA	40
f19467c5 DA	41	#define NOUVEAU_DSM_HAS_MUX 0x1
	42	#define NOUVEAU_DSM_HAS_OPT 0x2
	43
6a9ee8af DA	44	static const char nouveau_dsm_muid[] = {
	45	0xA0, 0xA0, 0x95, 0x9D, 0x60, 0x00, 0x48, 0x4D,
	46	0xB3, 0x4D, 0x7E, 0x5F, 0xEA, 0x12, 0x9F, 0xD4,
	47	};
6ee73861	48
f19467c5 DA	49	static const char nouveau_op_dsm_muid[] = {
	50	0xF8, 0xD8, 0x86, 0xA4, 0xDA, 0x0B, 0x1B, 0x47,
	51	0xA7, 0x2B, 0x60, 0x42, 0xA6, 0xB5, 0xBE, 0xE0,
	52	};
	53
	54	static int nouveau_optimus_dsm(acpi_handle handle, int func, int arg, uint32_t *result)
	55	{
	56	struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
	57	struct acpi_object_list input;
	58	union acpi_object params[4];
	59	union acpi_object *obj;
d099230c PL	60	int i, err;
d099230c PL	61	char args_buff[4];
f19467c5 DA	62
	63	input.count = 4;
	64	input.pointer = params;
	65	params[0].type = ACPI_TYPE_BUFFER;
	66	params[0].buffer.length = sizeof(nouveau_op_dsm_muid);
	67	params[0].buffer.pointer = (char *)nouveau_op_dsm_muid;
	68	params[1].type = ACPI_TYPE_INTEGER;
	69	params[1].integer.value = 0x00000100;
	70	params[2].type = ACPI_TYPE_INTEGER;
	71	params[2].integer.value = func;
	72	params[3].type = ACPI_TYPE_BUFFER;
d099230c PL	73	params[3].buffer.length = 4;
	74	/* ACPI is little endian, AABBCCDD becomes {DD,CC,BB,AA} */
	75	for (i = 0; i < 4; i++)
	76	args_buff[i] = (arg >> i * 8) & 0xFF;
	77	params[3].buffer.pointer = args_buff;
f19467c5 DA	78
	79	err = acpi_evaluate_object(handle, "_DSM", &input, &output);
	80	if (err) {
	81	printk(KERN_INFO "failed to evaluate _DSM: %d\n", err);
	82	return err;
	83	}
	84
	85	obj = (union acpi_object *)output.pointer;
	86
	87	if (obj->type == ACPI_TYPE_INTEGER)
	88	if (obj->integer.value == 0x80000002) {
	89	return -ENODEV;
	90	}
	91
	92	if (obj->type == ACPI_TYPE_BUFFER) {
	93	if (obj->buffer.length == 4 && result) {
	94	*result = 0;
	95	*result \|= obj->buffer.pointer[0];
	96	*result \|= (obj->buffer.pointer[1] << 8);
	97	*result \|= (obj->buffer.pointer[2] << 16);
	98	*result \|= (obj->buffer.pointer[3] << 24);
	99	}
	100	}
	101
	102	kfree(output.pointer);
	103	return 0;
	104	}
	105
6e86e041	106	static int nouveau_dsm(acpi_handle handle, int func, int arg, uint32_t *result)
6a9ee8af	107	{
6ee73861 BS	108	struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
	109	struct acpi_object_list input;
	110	union acpi_object params[4];
	111	union acpi_object *obj;
	112	int err;
	113
6ee73861 BS	114	input.count = 4;
	115	input.pointer = params;
	116	params[0].type = ACPI_TYPE_BUFFER;
6a9ee8af DA	117	params[0].buffer.length = sizeof(nouveau_dsm_muid);
6a9ee8af DA	118	params[0].buffer.pointer = (char *)nouveau_dsm_muid;
6ee73861 BS	119	params[1].type = ACPI_TYPE_INTEGER;
	120	params[1].integer.value = 0x00000102;
	121	params[2].type = ACPI_TYPE_INTEGER;
	122	params[2].integer.value = func;
	123	params[3].type = ACPI_TYPE_INTEGER;
	124	params[3].integer.value = arg;
	125
	126	err = acpi_evaluate_object(handle, "_DSM", &input, &output);
	127	if (err) {
6a9ee8af	128	printk(KERN_INFO "failed to evaluate _DSM: %d\n", err);
6ee73861 BS	129	return err;
	130	}
	131
	132	obj = (union acpi_object *)output.pointer;
	133
	134	if (obj->type == ACPI_TYPE_INTEGER)
	135	if (obj->integer.value == 0x80000002)
	136	return -ENODEV;
	137
	138	if (obj->type == ACPI_TYPE_BUFFER) {
	139	if (obj->buffer.length == 4 && result) {
	140	*result = 0;
	141	*result \|= obj->buffer.pointer[0];
	142	*result \|= (obj->buffer.pointer[1] << 8);
	143	*result \|= (obj->buffer.pointer[2] << 16);
	144	*result \|= (obj->buffer.pointer[3] << 24);
	145	}
	146	}
	147
	148	kfree(output.pointer);
	149	return 0;
	150	}
	151
9075e85f PL	152	/* Returns 1 if a DSM function is usable and 0 otherwise */
	153	static int nouveau_test_dsm(acpi_handle test_handle,
	154	int (dsm_func)(acpi_handle, int, int, uint32_t ),
	155	int sfnc)
	156	{
	157	u32 result = 0;
	158
	159	/* Function 0 returns a Buffer containing available functions. The args
	160	* parameter is ignored for function 0, so just put 0 in it */
	161	if (dsm_func(test_handle, 0, 0, &result))
	162	return 0;
	163
	164	/* ACPI Spec v4 9.14.1: if bit 0 is zero, no function is supported. If
	165	* the n-th bit is enabled, function n is supported */
	166	return result & 1 && result & (1 << sfnc);
	167	}
	168
6a9ee8af	169	static int nouveau_dsm_switch_mux(acpi_handle handle, int mux_id)
6ee73861	170	{
000703f4	171	mxm_wmi_call_mxmx(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0);
8116188f	172	mxm_wmi_call_mxds(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0);
6a9ee8af DA	173	return nouveau_dsm(handle, NOUVEAU_DSM_LED, mux_id, NULL);
	174	}
	175
	176	static int nouveau_dsm_set_discrete_state(acpi_handle handle, enum vga_switcheroo_state state)
	177	{
	178	int arg;
	179	if (state == VGA_SWITCHEROO_ON)
	180	arg = NOUVEAU_DSM_POWER_SPEED;
	181	else
	182	arg = NOUVEAU_DSM_POWER_STAMINA;
	183	nouveau_dsm(handle, NOUVEAU_DSM_POWER, arg, NULL);
	184	return 0;
	185	}
	186
	187	static int nouveau_dsm_switchto(enum vga_switcheroo_client_id id)
	188	{
d099230c PL	189	/* perhaps the _DSM functions are mutually exclusive, but prepare for
	190	* the future */
	191	if (!nouveau_dsm_priv.dsm_detected && nouveau_dsm_priv.optimus_detected)
	192	return 0;
6a9ee8af	193	if (id == VGA_SWITCHEROO_IGD)
fc5ea29d	194	return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_STAMINA);
6a9ee8af	195	else
fc5ea29d	196	return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_SPEED);
6a9ee8af	197	}
6ee73861	198
6a9ee8af DA	199	static int nouveau_dsm_power_state(enum vga_switcheroo_client_id id,
	200	enum vga_switcheroo_state state)
	201	{
	202	if (id == VGA_SWITCHEROO_IGD)
	203	return 0;
	204
d099230c PL	205	/* Optimus laptops have the card already disabled in
	206	* nouveau_switcheroo_set_state */
	207	if (!nouveau_dsm_priv.dsm_detected && nouveau_dsm_priv.optimus_detected)
	208	return 0;
	209
fc5ea29d	210	return nouveau_dsm_set_discrete_state(nouveau_dsm_priv.dhandle, state);
6a9ee8af DA	211	}
6a9ee8af DA	212
6a9ee8af	213	static int nouveau_dsm_get_client_id(struct pci_dev *pdev)
6ee73861	214	{
d1fbd923 DA	215	/* easy option one - intel vendor ID means Integrated */
d1fbd923 DA	216	if (pdev->vendor == PCI_VENDOR_ID_INTEL)
6a9ee8af	217	return VGA_SWITCHEROO_IGD;
d1fbd923 DA	218
	219	/* is this device on Bus 0? - this may need improving */
	220	if (pdev->bus->number == 0)
	221	return VGA_SWITCHEROO_IGD;
	222
	223	return VGA_SWITCHEROO_DIS;
6a9ee8af DA	224	}
	225
	226	static struct vga_switcheroo_handler nouveau_dsm_handler = {
	227	.switchto = nouveau_dsm_switchto,
	228	.power_state = nouveau_dsm_power_state,
6a9ee8af DA	229	.get_client_id = nouveau_dsm_get_client_id,
6a9ee8af DA	230	};
6ee73861	231
f19467c5	232	static int nouveau_dsm_pci_probe(struct pci_dev *pdev)
6a9ee8af DA	233	{
	234	acpi_handle dhandle, nvidia_handle;
	235	acpi_status status;
9075e85f	236	int retval = 0;
6a9ee8af DA	237
	238	dhandle = DEVICE_ACPI_HANDLE(&pdev->dev);
	239	if (!dhandle)
	240	return false;
afeb3e11	241
6a9ee8af DA	242	status = acpi_get_handle(dhandle, "_DSM", &nvidia_handle);
6a9ee8af DA	243	if (ACPI_FAILURE(status)) {
6ee73861	244	return false;
6a9ee8af	245	}
6ee73861	246
9075e85f	247	if (nouveau_test_dsm(dhandle, nouveau_dsm, NOUVEAU_DSM_POWER))
f19467c5 DA	248	retval \|= NOUVEAU_DSM_HAS_MUX;
f19467c5 DA	249
9075e85f PL	250	if (nouveau_test_dsm(dhandle, nouveau_optimus_dsm,
9075e85f PL	251	NOUVEAU_DSM_OPTIMUS_FN))
f19467c5 DA	252	retval \|= NOUVEAU_DSM_HAS_OPT;
	253
	254	if (retval)
	255	nouveau_dsm_priv.dhandle = dhandle;
6ee73861	256
f19467c5	257	return retval;
6ee73861	258	}
6a9ee8af DA	259
	260	static bool nouveau_dsm_detect(void)
	261	{
	262	char acpi_method_name[255] = { 0 };
	263	struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};
	264	struct pci_dev *pdev = NULL;
	265	int has_dsm = 0;
addde4ec	266	int has_optimus = 0;
6a9ee8af	267	int vga_count = 0;
8116188f	268	bool guid_valid;
f19467c5 DA	269	int retval;
f19467c5 DA	270	bool ret = false;
8116188f	271
f19467c5	272	/* lookup the MXM GUID */
8116188f	273	guid_valid = mxm_wmi_supported();
8116188f	274
f19467c5 DA	275	if (guid_valid)
f19467c5 DA	276	printk("MXM: GUID detected in BIOS\n");
afeb3e11	277
f19467c5	278	/* now do DSM detection */
6a9ee8af DA	279	while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
	280	vga_count++;
	281
f19467c5	282	retval = nouveau_dsm_pci_probe(pdev);
f19467c5 DA	283	if (retval & NOUVEAU_DSM_HAS_MUX)
	284	has_dsm \|= 1;
	285	if (retval & NOUVEAU_DSM_HAS_OPT)
	286	has_optimus = 1;
6a9ee8af DA	287	}
6a9ee8af DA	288
f19467c5	289	if (vga_count == 2 && has_dsm && guid_valid) {
d099230c PL	290	acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME,
d099230c PL	291	&buffer);
6a9ee8af	292	printk(KERN_INFO "VGA switcheroo: detected DSM switching method %s handle\n",
d099230c	293	acpi_method_name);
6a9ee8af	294	nouveau_dsm_priv.dsm_detected = true;
f19467c5	295	ret = true;
6a9ee8af	296	}
f19467c5	297
d099230c PL	298	if (has_optimus == 1) {
	299	acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME,
	300	&buffer);
	301	printk(KERN_INFO "VGA switcheroo: detected Optimus DSM method %s handle\n",
	302	acpi_method_name);
f19467c5	303	nouveau_dsm_priv.optimus_detected = true;
d099230c PL	304	ret = true;
d099230c PL	305	}
f19467c5 DA	306
f19467c5 DA	307	return ret;
6a9ee8af DA	308	}
	309
	310	void nouveau_register_dsm_handler(void)
	311	{
	312	bool r;
	313
	314	r = nouveau_dsm_detect();
	315	if (!r)
	316	return;
	317
	318	vga_switcheroo_register_handler(&nouveau_dsm_handler);
	319	}
	320
d099230c PL	321	/* Must be called for Optimus models before the card can be turned off */
	322	void nouveau_switcheroo_optimus_dsm(void)
	323	{
	324	u32 result = 0;
	325	if (!nouveau_dsm_priv.optimus_detected)
	326	return;
	327
	328	nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_FN,
	329	NOUVEAU_DSM_OPTIMUS_ARGS, &result);
	330	}
	331
6a9ee8af DA	332	void nouveau_unregister_dsm_handler(void)
6a9ee8af DA	333	{
2f3787aa AH	334	if (nouveau_dsm_priv.optimus_detected \|\| nouveau_dsm_priv.dsm_detected)
2f3787aa AH	335	vga_switcheroo_unregister_handler();
6a9ee8af	336	}
afeb3e11 DA	337
	338	/* retrieve the ROM in 4k blocks */
	339	static int nouveau_rom_call(acpi_handle rom_handle, uint8_t *bios,
	340	int offset, int len)
	341	{
	342	acpi_status status;
	343	union acpi_object rom_arg_elements[2], *obj;
	344	struct acpi_object_list rom_arg;
	345	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL};
	346
	347	rom_arg.count = 2;
	348	rom_arg.pointer = &rom_arg_elements[0];
	349
	350	rom_arg_elements[0].type = ACPI_TYPE_INTEGER;
	351	rom_arg_elements[0].integer.value = offset;
	352
	353	rom_arg_elements[1].type = ACPI_TYPE_INTEGER;
	354	rom_arg_elements[1].integer.value = len;
	355
	356	status = acpi_evaluate_object(rom_handle, NULL, &rom_arg, &buffer);
	357	if (ACPI_FAILURE(status)) {
	358	printk(KERN_INFO "failed to evaluate ROM got %s\n", acpi_format_exception(status));
	359	return -ENODEV;
	360	}
	361	obj = (union acpi_object *)buffer.pointer;
	362	memcpy(bios+offset, obj->buffer.pointer, len);
	363	kfree(buffer.pointer);
	364	return len;
	365	}
	366
	367	bool nouveau_acpi_rom_supported(struct pci_dev *pdev)
	368	{
	369	acpi_status status;
	370	acpi_handle dhandle, rom_handle;
	371
f19467c5	372	if (!nouveau_dsm_priv.dsm_detected && !nouveau_dsm_priv.optimus_detected)
afeb3e11 DA	373	return false;
	374
	375	dhandle = DEVICE_ACPI_HANDLE(&pdev->dev);
	376	if (!dhandle)
	377	return false;
	378
	379	status = acpi_get_handle(dhandle, "_ROM", &rom_handle);
	380	if (ACPI_FAILURE(status))
	381	return false;
	382
	383	nouveau_dsm_priv.rom_handle = rom_handle;
	384	return true;
	385	}
	386
	387	int nouveau_acpi_get_bios_chunk(uint8_t *bios, int offset, int len)
	388	{
	389	return nouveau_rom_call(nouveau_dsm_priv.rom_handle, bios, offset, len);
	390	}
a6ed76d7 BS	391
	392	int
	393	nouveau_acpi_edid(struct drm_device dev, struct drm_connector connector)
	394	{
	395	struct nouveau_connector *nv_connector = nouveau_connector(connector);
	396	struct acpi_device *acpidev;
	397	acpi_handle handle;
	398	int type, ret;
	399	void *edid;
	400
	401	switch (connector->connector_type) {
	402	case DRM_MODE_CONNECTOR_LVDS:
	403	case DRM_MODE_CONNECTOR_eDP:
	404	type = ACPI_VIDEO_DISPLAY_LCD;
	405	break;
	406	default:
	407	return -EINVAL;
	408	}
	409
	410	handle = DEVICE_ACPI_HANDLE(&dev->pdev->dev);
	411	if (!handle)
	412	return -ENODEV;
	413
	414	ret = acpi_bus_get_device(handle, &acpidev);
	415	if (ret)
	416	return -ENODEV;
	417
	418	ret = acpi_video_get_edid(acpidev, type, -1, &edid);
	419	if (ret < 0)
	420	return ret;
	421
24b102d3	422	nv_connector->edid = kmemdup(edid, EDID_LENGTH, GFP_KERNEL);
a6ed76d7 BS	423	return 0;
a6ed76d7 BS	424	}