[GitHub/mt8127/android_kernel_alcatel_ttab.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 <drm/drmP.h>
#include <drm/drm_crtc_helper.h>
#include "nouveau_drv.h"
#include <drm/nouveau_drm.h>
#include "nv50_display.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	9
760285e7 DH	10	#include <drm/drmP.h>
760285e7 DH	11	#include <drm/drm_crtc_helper.h>
6ee73861	12	#include "nouveau_drv.h"
760285e7	13	#include <drm/nouveau_drm.h>
6ee73861	14	#include "nv50_display.h"
a6ed76d7	15	#include "nouveau_connector.h"
6ee73861	16
6a9ee8af DA	17	#include <linux/vga_switcheroo.h>
6a9ee8af DA	18
6ee73861 BS	19	#define NOUVEAU_DSM_LED 0x02
	20	#define NOUVEAU_DSM_LED_STATE 0x00
	21	#define NOUVEAU_DSM_LED_OFF 0x10
	22	#define NOUVEAU_DSM_LED_STAMINA 0x11
	23	#define NOUVEAU_DSM_LED_SPEED 0x12
	24
	25	#define NOUVEAU_DSM_POWER 0x03
	26	#define NOUVEAU_DSM_POWER_STATE 0x00
	27	#define NOUVEAU_DSM_POWER_SPEED 0x01
	28	#define NOUVEAU_DSM_POWER_STAMINA 0x02
	29
9075e85f	30	#define NOUVEAU_DSM_OPTIMUS_FN 0x1A
d099230c PL	31	#define NOUVEAU_DSM_OPTIMUS_ARGS 0x03000001
d099230c PL	32
6a9ee8af DA	33	static struct nouveau_dsm_priv {
6a9ee8af DA	34	bool dsm_detected;
f19467c5	35	bool optimus_detected;
6a9ee8af	36	acpi_handle dhandle;
afeb3e11	37	acpi_handle rom_handle;
6a9ee8af DA	38	} nouveau_dsm_priv;
6a9ee8af DA	39
f19467c5 DA	40	#define NOUVEAU_DSM_HAS_MUX 0x1
	41	#define NOUVEAU_DSM_HAS_OPT 0x2
	42
6a9ee8af DA	43	static const char nouveau_dsm_muid[] = {
	44	0xA0, 0xA0, 0x95, 0x9D, 0x60, 0x00, 0x48, 0x4D,
	45	0xB3, 0x4D, 0x7E, 0x5F, 0xEA, 0x12, 0x9F, 0xD4,
	46	};
6ee73861	47
f19467c5 DA	48	static const char nouveau_op_dsm_muid[] = {
	49	0xF8, 0xD8, 0x86, 0xA4, 0xDA, 0x0B, 0x1B, 0x47,
	50	0xA7, 0x2B, 0x60, 0x42, 0xA6, 0xB5, 0xBE, 0xE0,
	51	};
	52
	53	static int nouveau_optimus_dsm(acpi_handle handle, int func, int arg, uint32_t *result)
	54	{
	55	struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
	56	struct acpi_object_list input;
	57	union acpi_object params[4];
	58	union acpi_object *obj;
d099230c PL	59	int i, err;
d099230c PL	60	char args_buff[4];
f19467c5 DA	61
	62	input.count = 4;
	63	input.pointer = params;
	64	params[0].type = ACPI_TYPE_BUFFER;
	65	params[0].buffer.length = sizeof(nouveau_op_dsm_muid);
	66	params[0].buffer.pointer = (char *)nouveau_op_dsm_muid;
	67	params[1].type = ACPI_TYPE_INTEGER;
	68	params[1].integer.value = 0x00000100;
	69	params[2].type = ACPI_TYPE_INTEGER;
	70	params[2].integer.value = func;
	71	params[3].type = ACPI_TYPE_BUFFER;
d099230c PL	72	params[3].buffer.length = 4;
	73	/* ACPI is little endian, AABBCCDD becomes {DD,CC,BB,AA} */
	74	for (i = 0; i < 4; i++)
	75	args_buff[i] = (arg >> i * 8) & 0xFF;
	76	params[3].buffer.pointer = args_buff;
f19467c5 DA	77
	78	err = acpi_evaluate_object(handle, "_DSM", &input, &output);
	79	if (err) {
	80	printk(KERN_INFO "failed to evaluate _DSM: %d\n", err);
	81	return err;
	82	}
	83
	84	obj = (union acpi_object *)output.pointer;
	85
	86	if (obj->type == ACPI_TYPE_INTEGER)
	87	if (obj->integer.value == 0x80000002) {
	88	return -ENODEV;
	89	}
	90
	91	if (obj->type == ACPI_TYPE_BUFFER) {
	92	if (obj->buffer.length == 4 && result) {
	93	*result = 0;
	94	*result \|= obj->buffer.pointer[0];
	95	*result \|= (obj->buffer.pointer[1] << 8);
	96	*result \|= (obj->buffer.pointer[2] << 16);
	97	*result \|= (obj->buffer.pointer[3] << 24);
	98	}
	99	}
	100
	101	kfree(output.pointer);
	102	return 0;
	103	}
	104
6e86e041	105	static int nouveau_dsm(acpi_handle handle, int func, int arg, uint32_t *result)
6a9ee8af	106	{
6ee73861 BS	107	struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
	108	struct acpi_object_list input;
	109	union acpi_object params[4];
	110	union acpi_object *obj;
	111	int err;
	112
6ee73861 BS	113	input.count = 4;
	114	input.pointer = params;
	115	params[0].type = ACPI_TYPE_BUFFER;
6a9ee8af DA	116	params[0].buffer.length = sizeof(nouveau_dsm_muid);
6a9ee8af DA	117	params[0].buffer.pointer = (char *)nouveau_dsm_muid;
6ee73861 BS	118	params[1].type = ACPI_TYPE_INTEGER;
	119	params[1].integer.value = 0x00000102;
	120	params[2].type = ACPI_TYPE_INTEGER;
	121	params[2].integer.value = func;
	122	params[3].type = ACPI_TYPE_INTEGER;
	123	params[3].integer.value = arg;
	124
	125	err = acpi_evaluate_object(handle, "_DSM", &input, &output);
	126	if (err) {
6a9ee8af	127	printk(KERN_INFO "failed to evaluate _DSM: %d\n", err);
6ee73861 BS	128	return err;
	129	}
	130
	131	obj = (union acpi_object *)output.pointer;
	132
	133	if (obj->type == ACPI_TYPE_INTEGER)
	134	if (obj->integer.value == 0x80000002)
	135	return -ENODEV;
	136
	137	if (obj->type == ACPI_TYPE_BUFFER) {
	138	if (obj->buffer.length == 4 && result) {
	139	*result = 0;
	140	*result \|= obj->buffer.pointer[0];
	141	*result \|= (obj->buffer.pointer[1] << 8);
	142	*result \|= (obj->buffer.pointer[2] << 16);
	143	*result \|= (obj->buffer.pointer[3] << 24);
	144	}
	145	}
	146
	147	kfree(output.pointer);
	148	return 0;
	149	}
	150
9075e85f PL	151	/* Returns 1 if a DSM function is usable and 0 otherwise */
	152	static int nouveau_test_dsm(acpi_handle test_handle,
	153	int (dsm_func)(acpi_handle, int, int, uint32_t ),
	154	int sfnc)
	155	{
	156	u32 result = 0;
	157
	158	/* Function 0 returns a Buffer containing available functions. The args
	159	* parameter is ignored for function 0, so just put 0 in it */
	160	if (dsm_func(test_handle, 0, 0, &result))
	161	return 0;
	162
	163	/* ACPI Spec v4 9.14.1: if bit 0 is zero, no function is supported. If
	164	* the n-th bit is enabled, function n is supported */
	165	return result & 1 && result & (1 << sfnc);
	166	}
	167
6a9ee8af	168	static int nouveau_dsm_switch_mux(acpi_handle handle, int mux_id)
6ee73861	169	{
000703f4	170	mxm_wmi_call_mxmx(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0);
8116188f	171	mxm_wmi_call_mxds(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0);
6a9ee8af DA	172	return nouveau_dsm(handle, NOUVEAU_DSM_LED, mux_id, NULL);
	173	}
	174
	175	static int nouveau_dsm_set_discrete_state(acpi_handle handle, enum vga_switcheroo_state state)
	176	{
	177	int arg;
	178	if (state == VGA_SWITCHEROO_ON)
	179	arg = NOUVEAU_DSM_POWER_SPEED;
	180	else
	181	arg = NOUVEAU_DSM_POWER_STAMINA;
	182	nouveau_dsm(handle, NOUVEAU_DSM_POWER, arg, NULL);
	183	return 0;
	184	}
	185
	186	static int nouveau_dsm_switchto(enum vga_switcheroo_client_id id)
	187	{
d099230c PL	188	/* perhaps the _DSM functions are mutually exclusive, but prepare for
	189	* the future */
	190	if (!nouveau_dsm_priv.dsm_detected && nouveau_dsm_priv.optimus_detected)
	191	return 0;
6a9ee8af	192	if (id == VGA_SWITCHEROO_IGD)
fc5ea29d	193	return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_STAMINA);
6a9ee8af	194	else
fc5ea29d	195	return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_SPEED);
6a9ee8af	196	}
6ee73861	197
6a9ee8af DA	198	static int nouveau_dsm_power_state(enum vga_switcheroo_client_id id,
	199	enum vga_switcheroo_state state)
	200	{
	201	if (id == VGA_SWITCHEROO_IGD)
	202	return 0;
	203
d099230c PL	204	/* Optimus laptops have the card already disabled in
	205	* nouveau_switcheroo_set_state */
	206	if (!nouveau_dsm_priv.dsm_detected && nouveau_dsm_priv.optimus_detected)
	207	return 0;
	208
fc5ea29d	209	return nouveau_dsm_set_discrete_state(nouveau_dsm_priv.dhandle, state);
6a9ee8af DA	210	}
6a9ee8af DA	211
6a9ee8af	212	static int nouveau_dsm_get_client_id(struct pci_dev *pdev)
6ee73861	213	{
d1fbd923 DA	214	/* easy option one - intel vendor ID means Integrated */
d1fbd923 DA	215	if (pdev->vendor == PCI_VENDOR_ID_INTEL)
6a9ee8af	216	return VGA_SWITCHEROO_IGD;
d1fbd923 DA	217
	218	/* is this device on Bus 0? - this may need improving */
	219	if (pdev->bus->number == 0)
	220	return VGA_SWITCHEROO_IGD;
	221
	222	return VGA_SWITCHEROO_DIS;
6a9ee8af DA	223	}
	224
	225	static struct vga_switcheroo_handler nouveau_dsm_handler = {
	226	.switchto = nouveau_dsm_switchto,
	227	.power_state = nouveau_dsm_power_state,
6a9ee8af DA	228	.get_client_id = nouveau_dsm_get_client_id,
6a9ee8af DA	229	};
6ee73861	230
f19467c5	231	static int nouveau_dsm_pci_probe(struct pci_dev *pdev)
6a9ee8af DA	232	{
	233	acpi_handle dhandle, nvidia_handle;
	234	acpi_status status;
9075e85f	235	int retval = 0;
6a9ee8af DA	236
	237	dhandle = DEVICE_ACPI_HANDLE(&pdev->dev);
	238	if (!dhandle)
	239	return false;
afeb3e11	240
6a9ee8af DA	241	status = acpi_get_handle(dhandle, "_DSM", &nvidia_handle);
6a9ee8af DA	242	if (ACPI_FAILURE(status)) {
6ee73861	243	return false;
6a9ee8af	244	}
6ee73861	245
9075e85f	246	if (nouveau_test_dsm(dhandle, nouveau_dsm, NOUVEAU_DSM_POWER))
f19467c5 DA	247	retval \|= NOUVEAU_DSM_HAS_MUX;
f19467c5 DA	248
9075e85f PL	249	if (nouveau_test_dsm(dhandle, nouveau_optimus_dsm,
9075e85f PL	250	NOUVEAU_DSM_OPTIMUS_FN))
f19467c5 DA	251	retval \|= NOUVEAU_DSM_HAS_OPT;
	252
	253	if (retval)
	254	nouveau_dsm_priv.dhandle = dhandle;
6ee73861	255
f19467c5	256	return retval;
6ee73861	257	}
6a9ee8af DA	258
	259	static bool nouveau_dsm_detect(void)
	260	{
	261	char acpi_method_name[255] = { 0 };
	262	struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};
	263	struct pci_dev *pdev = NULL;
	264	int has_dsm = 0;
addde4ec	265	int has_optimus = 0;
6a9ee8af	266	int vga_count = 0;
8116188f	267	bool guid_valid;
f19467c5 DA	268	int retval;
f19467c5 DA	269	bool ret = false;
8116188f	270
f19467c5	271	/* lookup the MXM GUID */
8116188f	272	guid_valid = mxm_wmi_supported();
8116188f	273
f19467c5 DA	274	if (guid_valid)
f19467c5 DA	275	printk("MXM: GUID detected in BIOS\n");
afeb3e11	276
f19467c5	277	/* now do DSM detection */
6a9ee8af DA	278	while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
	279	vga_count++;
	280
f19467c5	281	retval = nouveau_dsm_pci_probe(pdev);
f19467c5 DA	282	if (retval & NOUVEAU_DSM_HAS_MUX)
	283	has_dsm \|= 1;
	284	if (retval & NOUVEAU_DSM_HAS_OPT)
	285	has_optimus = 1;
6a9ee8af DA	286	}
6a9ee8af DA	287
f19467c5	288	if (vga_count == 2 && has_dsm && guid_valid) {
d099230c PL	289	acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME,
d099230c PL	290	&buffer);
6a9ee8af	291	printk(KERN_INFO "VGA switcheroo: detected DSM switching method %s handle\n",
d099230c	292	acpi_method_name);
6a9ee8af	293	nouveau_dsm_priv.dsm_detected = true;
f19467c5	294	ret = true;
6a9ee8af	295	}
f19467c5	296
d099230c PL	297	if (has_optimus == 1) {
	298	acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME,
	299	&buffer);
	300	printk(KERN_INFO "VGA switcheroo: detected Optimus DSM method %s handle\n",
	301	acpi_method_name);
f19467c5	302	nouveau_dsm_priv.optimus_detected = true;
d099230c PL	303	ret = true;
d099230c PL	304	}
f19467c5 DA	305
f19467c5 DA	306	return ret;
6a9ee8af DA	307	}
	308
	309	void nouveau_register_dsm_handler(void)
	310	{
	311	bool r;
	312
	313	r = nouveau_dsm_detect();
	314	if (!r)
	315	return;
	316
	317	vga_switcheroo_register_handler(&nouveau_dsm_handler);
	318	}
	319
d099230c PL	320	/* Must be called for Optimus models before the card can be turned off */
	321	void nouveau_switcheroo_optimus_dsm(void)
	322	{
	323	u32 result = 0;
	324	if (!nouveau_dsm_priv.optimus_detected)
	325	return;
	326
	327	nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_FN,
	328	NOUVEAU_DSM_OPTIMUS_ARGS, &result);
	329	}
	330
6a9ee8af DA	331	void nouveau_unregister_dsm_handler(void)
6a9ee8af DA	332	{
2f3787aa AH	333	if (nouveau_dsm_priv.optimus_detected \|\| nouveau_dsm_priv.dsm_detected)
2f3787aa AH	334	vga_switcheroo_unregister_handler();
6a9ee8af	335	}
afeb3e11 DA	336
	337	/* retrieve the ROM in 4k blocks */
	338	static int nouveau_rom_call(acpi_handle rom_handle, uint8_t *bios,
	339	int offset, int len)
	340	{
	341	acpi_status status;
	342	union acpi_object rom_arg_elements[2], *obj;
	343	struct acpi_object_list rom_arg;
	344	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL};
	345
	346	rom_arg.count = 2;
	347	rom_arg.pointer = &rom_arg_elements[0];
	348
	349	rom_arg_elements[0].type = ACPI_TYPE_INTEGER;
	350	rom_arg_elements[0].integer.value = offset;
	351
	352	rom_arg_elements[1].type = ACPI_TYPE_INTEGER;
	353	rom_arg_elements[1].integer.value = len;
	354
	355	status = acpi_evaluate_object(rom_handle, NULL, &rom_arg, &buffer);
	356	if (ACPI_FAILURE(status)) {
	357	printk(KERN_INFO "failed to evaluate ROM got %s\n", acpi_format_exception(status));
	358	return -ENODEV;
	359	}
	360	obj = (union acpi_object *)buffer.pointer;
	361	memcpy(bios+offset, obj->buffer.pointer, len);
	362	kfree(buffer.pointer);
	363	return len;
	364	}
	365
	366	bool nouveau_acpi_rom_supported(struct pci_dev *pdev)
	367	{
	368	acpi_status status;
	369	acpi_handle dhandle, rom_handle;
	370
f19467c5	371	if (!nouveau_dsm_priv.dsm_detected && !nouveau_dsm_priv.optimus_detected)
afeb3e11 DA	372	return false;
	373
	374	dhandle = DEVICE_ACPI_HANDLE(&pdev->dev);
	375	if (!dhandle)
	376	return false;
	377
	378	status = acpi_get_handle(dhandle, "_ROM", &rom_handle);
	379	if (ACPI_FAILURE(status))
	380	return false;
	381
	382	nouveau_dsm_priv.rom_handle = rom_handle;
	383	return true;
	384	}
	385
	386	int nouveau_acpi_get_bios_chunk(uint8_t *bios, int offset, int len)
	387	{
	388	return nouveau_rom_call(nouveau_dsm_priv.rom_handle, bios, offset, len);
	389	}
a6ed76d7 BS	390
	391	int
	392	nouveau_acpi_edid(struct drm_device dev, struct drm_connector connector)
	393	{
	394	struct nouveau_connector *nv_connector = nouveau_connector(connector);
	395	struct acpi_device *acpidev;
	396	acpi_handle handle;
	397	int type, ret;
	398	void *edid;
	399
	400	switch (connector->connector_type) {
	401	case DRM_MODE_CONNECTOR_LVDS:
	402	case DRM_MODE_CONNECTOR_eDP:
	403	type = ACPI_VIDEO_DISPLAY_LCD;
	404	break;
	405	default:
	406	return -EINVAL;
	407	}
	408
	409	handle = DEVICE_ACPI_HANDLE(&dev->pdev->dev);
	410	if (!handle)
	411	return -ENODEV;
	412
	413	ret = acpi_bus_get_device(handle, &acpidev);
	414	if (ret)
	415	return -ENODEV;
	416
	417	ret = acpi_video_get_edid(acpidev, type, -1, &edid);
	418	if (ret < 0)
	419	return ret;
	420
24b102d3	421	nv_connector->edid = kmemdup(edid, EDID_LENGTH, GFP_KERNEL);
a6ed76d7 BS	422	return 0;
a6ed76d7 BS	423	}