[mirror_ubuntu-zesty-kernel.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 <linux/vga_switcheroo.h>

#include "drm_edid.h"

#include "nouveau_drm.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_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);
}

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 = DEVICE_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);
}
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	9
6a9ee8af DA	10	#include <linux/vga_switcheroo.h>
6a9ee8af DA	11
c0077061 BS	12	#include "drm_edid.h"
	13
	14	#include "nouveau_drm.h"
	15	#include "nouveau_acpi.h"
	16
6ee73861 BS	17	#define NOUVEAU_DSM_LED 0x02
	18	#define NOUVEAU_DSM_LED_STATE 0x00
	19	#define NOUVEAU_DSM_LED_OFF 0x10
	20	#define NOUVEAU_DSM_LED_STAMINA 0x11
	21	#define NOUVEAU_DSM_LED_SPEED 0x12
	22
	23	#define NOUVEAU_DSM_POWER 0x03
	24	#define NOUVEAU_DSM_POWER_STATE 0x00
	25	#define NOUVEAU_DSM_POWER_SPEED 0x01
	26	#define NOUVEAU_DSM_POWER_STAMINA 0x02
	27
9075e85f	28	#define NOUVEAU_DSM_OPTIMUS_FN 0x1A
d099230c PL	29	#define NOUVEAU_DSM_OPTIMUS_ARGS 0x03000001
d099230c PL	30
6a9ee8af DA	31	static struct nouveau_dsm_priv {
6a9ee8af DA	32	bool dsm_detected;
f19467c5	33	bool optimus_detected;
6a9ee8af	34	acpi_handle dhandle;
afeb3e11	35	acpi_handle rom_handle;
6a9ee8af DA	36	} nouveau_dsm_priv;
6a9ee8af DA	37
f19467c5 DA	38	#define NOUVEAU_DSM_HAS_MUX 0x1
	39	#define NOUVEAU_DSM_HAS_OPT 0x2
	40
6a9ee8af DA	41	static const char nouveau_dsm_muid[] = {
	42	0xA0, 0xA0, 0x95, 0x9D, 0x60, 0x00, 0x48, 0x4D,
	43	0xB3, 0x4D, 0x7E, 0x5F, 0xEA, 0x12, 0x9F, 0xD4,
	44	};
6ee73861	45
f19467c5 DA	46	static const char nouveau_op_dsm_muid[] = {
	47	0xF8, 0xD8, 0x86, 0xA4, 0xDA, 0x0B, 0x1B, 0x47,
	48	0xA7, 0x2B, 0x60, 0x42, 0xA6, 0xB5, 0xBE, 0xE0,
	49	};
	50
	51	static int nouveau_optimus_dsm(acpi_handle handle, int func, int arg, uint32_t *result)
	52	{
	53	struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
	54	struct acpi_object_list input;
	55	union acpi_object params[4];
	56	union acpi_object *obj;
d099230c PL	57	int i, err;
d099230c PL	58	char args_buff[4];
f19467c5 DA	59
	60	input.count = 4;
	61	input.pointer = params;
	62	params[0].type = ACPI_TYPE_BUFFER;
	63	params[0].buffer.length = sizeof(nouveau_op_dsm_muid);
	64	params[0].buffer.pointer = (char *)nouveau_op_dsm_muid;
	65	params[1].type = ACPI_TYPE_INTEGER;
	66	params[1].integer.value = 0x00000100;
	67	params[2].type = ACPI_TYPE_INTEGER;
	68	params[2].integer.value = func;
	69	params[3].type = ACPI_TYPE_BUFFER;
d099230c PL	70	params[3].buffer.length = 4;
	71	/* ACPI is little endian, AABBCCDD becomes {DD,CC,BB,AA} */
	72	for (i = 0; i < 4; i++)
	73	args_buff[i] = (arg >> i * 8) & 0xFF;
	74	params[3].buffer.pointer = args_buff;
f19467c5 DA	75
	76	err = acpi_evaluate_object(handle, "_DSM", &input, &output);
	77	if (err) {
	78	printk(KERN_INFO "failed to evaluate _DSM: %d\n", err);
	79	return err;
	80	}
	81
	82	obj = (union acpi_object *)output.pointer;
	83
	84	if (obj->type == ACPI_TYPE_INTEGER)
	85	if (obj->integer.value == 0x80000002) {
	86	return -ENODEV;
	87	}
	88
	89	if (obj->type == ACPI_TYPE_BUFFER) {
	90	if (obj->buffer.length == 4 && result) {
	91	*result = 0;
	92	*result \|= obj->buffer.pointer[0];
	93	*result \|= (obj->buffer.pointer[1] << 8);
	94	*result \|= (obj->buffer.pointer[2] << 16);
	95	*result \|= (obj->buffer.pointer[3] << 24);
	96	}
	97	}
	98
	99	kfree(output.pointer);
	100	return 0;
	101	}
	102
6e86e041	103	static int nouveau_dsm(acpi_handle handle, int func, int arg, uint32_t *result)
6a9ee8af	104	{
6ee73861 BS	105	struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
	106	struct acpi_object_list input;
	107	union acpi_object params[4];
	108	union acpi_object *obj;
	109	int err;
	110
6ee73861 BS	111	input.count = 4;
	112	input.pointer = params;
	113	params[0].type = ACPI_TYPE_BUFFER;
6a9ee8af DA	114	params[0].buffer.length = sizeof(nouveau_dsm_muid);
6a9ee8af DA	115	params[0].buffer.pointer = (char *)nouveau_dsm_muid;
6ee73861 BS	116	params[1].type = ACPI_TYPE_INTEGER;
	117	params[1].integer.value = 0x00000102;
	118	params[2].type = ACPI_TYPE_INTEGER;
	119	params[2].integer.value = func;
	120	params[3].type = ACPI_TYPE_INTEGER;
	121	params[3].integer.value = arg;
	122
	123	err = acpi_evaluate_object(handle, "_DSM", &input, &output);
	124	if (err) {
6a9ee8af	125	printk(KERN_INFO "failed to evaluate _DSM: %d\n", err);
6ee73861 BS	126	return err;
	127	}
	128
	129	obj = (union acpi_object *)output.pointer;
	130
	131	if (obj->type == ACPI_TYPE_INTEGER)
	132	if (obj->integer.value == 0x80000002)
	133	return -ENODEV;
	134
	135	if (obj->type == ACPI_TYPE_BUFFER) {
	136	if (obj->buffer.length == 4 && result) {
	137	*result = 0;
	138	*result \|= obj->buffer.pointer[0];
	139	*result \|= (obj->buffer.pointer[1] << 8);
	140	*result \|= (obj->buffer.pointer[2] << 16);
	141	*result \|= (obj->buffer.pointer[3] << 24);
	142	}
	143	}
	144
	145	kfree(output.pointer);
	146	return 0;
	147	}
	148
9075e85f PL	149	/* Returns 1 if a DSM function is usable and 0 otherwise */
	150	static int nouveau_test_dsm(acpi_handle test_handle,
	151	int (dsm_func)(acpi_handle, int, int, uint32_t ),
	152	int sfnc)
	153	{
	154	u32 result = 0;
	155
	156	/* Function 0 returns a Buffer containing available functions. The args
	157	* parameter is ignored for function 0, so just put 0 in it */
	158	if (dsm_func(test_handle, 0, 0, &result))
	159	return 0;
	160
	161	/* ACPI Spec v4 9.14.1: if bit 0 is zero, no function is supported. If
	162	* the n-th bit is enabled, function n is supported */
	163	return result & 1 && result & (1 << sfnc);
	164	}
	165
6a9ee8af	166	static int nouveau_dsm_switch_mux(acpi_handle handle, int mux_id)
6ee73861	167	{
000703f4	168	mxm_wmi_call_mxmx(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0);
8116188f	169	mxm_wmi_call_mxds(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0);
6a9ee8af DA	170	return nouveau_dsm(handle, NOUVEAU_DSM_LED, mux_id, NULL);
	171	}
	172
	173	static int nouveau_dsm_set_discrete_state(acpi_handle handle, enum vga_switcheroo_state state)
	174	{
	175	int arg;
	176	if (state == VGA_SWITCHEROO_ON)
	177	arg = NOUVEAU_DSM_POWER_SPEED;
	178	else
	179	arg = NOUVEAU_DSM_POWER_STAMINA;
	180	nouveau_dsm(handle, NOUVEAU_DSM_POWER, arg, NULL);
	181	return 0;
	182	}
	183
	184	static int nouveau_dsm_switchto(enum vga_switcheroo_client_id id)
	185	{
d099230c PL	186	/* perhaps the _DSM functions are mutually exclusive, but prepare for
	187	* the future */
	188	if (!nouveau_dsm_priv.dsm_detected && nouveau_dsm_priv.optimus_detected)
	189	return 0;
6a9ee8af	190	if (id == VGA_SWITCHEROO_IGD)
fc5ea29d	191	return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_STAMINA);
6a9ee8af	192	else
fc5ea29d	193	return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_SPEED);
6a9ee8af	194	}
6ee73861	195
6a9ee8af DA	196	static int nouveau_dsm_power_state(enum vga_switcheroo_client_id id,
	197	enum vga_switcheroo_state state)
	198	{
	199	if (id == VGA_SWITCHEROO_IGD)
	200	return 0;
	201
d099230c PL	202	/* Optimus laptops have the card already disabled in
	203	* nouveau_switcheroo_set_state */
	204	if (!nouveau_dsm_priv.dsm_detected && nouveau_dsm_priv.optimus_detected)
	205	return 0;
	206
fc5ea29d	207	return nouveau_dsm_set_discrete_state(nouveau_dsm_priv.dhandle, state);
6a9ee8af DA	208	}
6a9ee8af DA	209
6a9ee8af	210	static int nouveau_dsm_get_client_id(struct pci_dev *pdev)
6ee73861	211	{
d1fbd923 DA	212	/* easy option one - intel vendor ID means Integrated */
d1fbd923 DA	213	if (pdev->vendor == PCI_VENDOR_ID_INTEL)
6a9ee8af	214	return VGA_SWITCHEROO_IGD;
d1fbd923 DA	215
	216	/* is this device on Bus 0? - this may need improving */
	217	if (pdev->bus->number == 0)
	218	return VGA_SWITCHEROO_IGD;
	219
	220	return VGA_SWITCHEROO_DIS;
6a9ee8af DA	221	}
	222
	223	static struct vga_switcheroo_handler nouveau_dsm_handler = {
	224	.switchto = nouveau_dsm_switchto,
	225	.power_state = nouveau_dsm_power_state,
6a9ee8af DA	226	.get_client_id = nouveau_dsm_get_client_id,
6a9ee8af DA	227	};
6ee73861	228
f19467c5	229	static int nouveau_dsm_pci_probe(struct pci_dev *pdev)
6a9ee8af DA	230	{
	231	acpi_handle dhandle, nvidia_handle;
	232	acpi_status status;
9075e85f	233	int retval = 0;
6a9ee8af DA	234
	235	dhandle = DEVICE_ACPI_HANDLE(&pdev->dev);
	236	if (!dhandle)
	237	return false;
afeb3e11	238
6a9ee8af DA	239	status = acpi_get_handle(dhandle, "_DSM", &nvidia_handle);
6a9ee8af DA	240	if (ACPI_FAILURE(status)) {
6ee73861	241	return false;
6a9ee8af	242	}
6ee73861	243
9075e85f	244	if (nouveau_test_dsm(dhandle, nouveau_dsm, NOUVEAU_DSM_POWER))
f19467c5 DA	245	retval \|= NOUVEAU_DSM_HAS_MUX;
f19467c5 DA	246
9075e85f PL	247	if (nouveau_test_dsm(dhandle, nouveau_optimus_dsm,
9075e85f PL	248	NOUVEAU_DSM_OPTIMUS_FN))
f19467c5 DA	249	retval \|= NOUVEAU_DSM_HAS_OPT;
	250
	251	if (retval)
	252	nouveau_dsm_priv.dhandle = dhandle;
6ee73861	253
f19467c5	254	return retval;
6ee73861	255	}
6a9ee8af DA	256
	257	static bool nouveau_dsm_detect(void)
	258	{
	259	char acpi_method_name[255] = { 0 };
	260	struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};
	261	struct pci_dev *pdev = NULL;
	262	int has_dsm = 0;
addde4ec	263	int has_optimus = 0;
6a9ee8af	264	int vga_count = 0;
8116188f	265	bool guid_valid;
f19467c5 DA	266	int retval;
f19467c5 DA	267	bool ret = false;
8116188f	268
f19467c5	269	/* lookup the MXM GUID */
8116188f	270	guid_valid = mxm_wmi_supported();
8116188f	271
f19467c5 DA	272	if (guid_valid)
f19467c5 DA	273	printk("MXM: GUID detected in BIOS\n");
afeb3e11	274
f19467c5	275	/* now do DSM detection */
6a9ee8af DA	276	while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
	277	vga_count++;
	278
f19467c5	279	retval = nouveau_dsm_pci_probe(pdev);
f19467c5 DA	280	if (retval & NOUVEAU_DSM_HAS_MUX)
	281	has_dsm \|= 1;
	282	if (retval & NOUVEAU_DSM_HAS_OPT)
	283	has_optimus = 1;
6a9ee8af DA	284	}
6a9ee8af DA	285
f19467c5	286	if (vga_count == 2 && has_dsm && guid_valid) {
d099230c PL	287	acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME,
d099230c PL	288	&buffer);
6a9ee8af	289	printk(KERN_INFO "VGA switcheroo: detected DSM switching method %s handle\n",
d099230c	290	acpi_method_name);
6a9ee8af	291	nouveau_dsm_priv.dsm_detected = true;
f19467c5	292	ret = true;
6a9ee8af	293	}
f19467c5	294
d099230c PL	295	if (has_optimus == 1) {
	296	acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME,
	297	&buffer);
	298	printk(KERN_INFO "VGA switcheroo: detected Optimus DSM method %s handle\n",
	299	acpi_method_name);
f19467c5	300	nouveau_dsm_priv.optimus_detected = true;
d099230c PL	301	ret = true;
d099230c PL	302	}
f19467c5 DA	303
f19467c5 DA	304	return ret;
6a9ee8af DA	305	}
	306
	307	void nouveau_register_dsm_handler(void)
	308	{
	309	bool r;
	310
	311	r = nouveau_dsm_detect();
	312	if (!r)
	313	return;
	314
	315	vga_switcheroo_register_handler(&nouveau_dsm_handler);
	316	}
	317
d099230c PL	318	/* Must be called for Optimus models before the card can be turned off */
	319	void nouveau_switcheroo_optimus_dsm(void)
	320	{
	321	u32 result = 0;
	322	if (!nouveau_dsm_priv.optimus_detected)
	323	return;
	324
	325	nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_FN,
	326	NOUVEAU_DSM_OPTIMUS_ARGS, &result);
	327	}
	328
6a9ee8af DA	329	void nouveau_unregister_dsm_handler(void)
6a9ee8af DA	330	{
2f3787aa AH	331	if (nouveau_dsm_priv.optimus_detected \|\| nouveau_dsm_priv.dsm_detected)
2f3787aa AH	332	vga_switcheroo_unregister_handler();
6a9ee8af	333	}
afeb3e11 DA	334
	335	/* retrieve the ROM in 4k blocks */
	336	static int nouveau_rom_call(acpi_handle rom_handle, uint8_t *bios,
	337	int offset, int len)
	338	{
	339	acpi_status status;
	340	union acpi_object rom_arg_elements[2], *obj;
	341	struct acpi_object_list rom_arg;
	342	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL};
	343
	344	rom_arg.count = 2;
	345	rom_arg.pointer = &rom_arg_elements[0];
	346
	347	rom_arg_elements[0].type = ACPI_TYPE_INTEGER;
	348	rom_arg_elements[0].integer.value = offset;
	349
	350	rom_arg_elements[1].type = ACPI_TYPE_INTEGER;
	351	rom_arg_elements[1].integer.value = len;
	352
	353	status = acpi_evaluate_object(rom_handle, NULL, &rom_arg, &buffer);
	354	if (ACPI_FAILURE(status)) {
	355	printk(KERN_INFO "failed to evaluate ROM got %s\n", acpi_format_exception(status));
	356	return -ENODEV;
	357	}
	358	obj = (union acpi_object *)buffer.pointer;
	359	memcpy(bios+offset, obj->buffer.pointer, len);
	360	kfree(buffer.pointer);
	361	return len;
	362	}
	363
	364	bool nouveau_acpi_rom_supported(struct pci_dev *pdev)
	365	{
	366	acpi_status status;
	367	acpi_handle dhandle, rom_handle;
	368
f19467c5	369	if (!nouveau_dsm_priv.dsm_detected && !nouveau_dsm_priv.optimus_detected)
afeb3e11 DA	370	return false;
	371
	372	dhandle = DEVICE_ACPI_HANDLE(&pdev->dev);
	373	if (!dhandle)
	374	return false;
	375
	376	status = acpi_get_handle(dhandle, "_ROM", &rom_handle);
	377	if (ACPI_FAILURE(status))
	378	return false;
	379
	380	nouveau_dsm_priv.rom_handle = rom_handle;
	381	return true;
	382	}
	383
	384	int nouveau_acpi_get_bios_chunk(uint8_t *bios, int offset, int len)
	385	{
	386	return nouveau_rom_call(nouveau_dsm_priv.rom_handle, bios, offset, len);
	387	}
a6ed76d7	388
c0077061	389	void *
a6ed76d7 BS	390	nouveau_acpi_edid(struct drm_device dev, struct drm_connector connector)
a6ed76d7 BS	391	{
a6ed76d7 BS	392	struct acpi_device *acpidev;
	393	acpi_handle handle;
	394	int type, ret;
	395	void *edid;
	396
	397	switch (connector->connector_type) {
	398	case DRM_MODE_CONNECTOR_LVDS:
	399	case DRM_MODE_CONNECTOR_eDP:
	400	type = ACPI_VIDEO_DISPLAY_LCD;
	401	break;
	402	default:
c0077061	403	return NULL;
a6ed76d7 BS	404	}
	405
	406	handle = DEVICE_ACPI_HANDLE(&dev->pdev->dev);
	407	if (!handle)
c0077061	408	return NULL;
a6ed76d7 BS	409
	410	ret = acpi_bus_get_device(handle, &acpidev);
	411	if (ret)
c0077061	412	return NULL;
a6ed76d7 BS	413
	414	ret = acpi_video_get_edid(acpidev, type, -1, &edid);
	415	if (ret < 0)
c0077061	416	return NULL;
a6ed76d7	417
c0077061	418	return kmemdup(edid, EDID_LENGTH, GFP_KERNEL);
a6ed76d7	419	}