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

#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_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_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;
	acpi_handle dhandle;
	acpi_handle rom_handle;
} 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;
}

#define NOUVEAU_DSM_HAS_MUX 0x1
#define NOUVEAU_DSM_HAS_OPT 0x2

#ifdef CONFIG_VGA_SWITCHEROO
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)
{
	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_check_optimus_dsm(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
	 */
	return result & 1 && result & (1 << NOUVEAU_DSM_OPTIMUS_CAPS);
}

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 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 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 int nouveau_dsm_pci_probe(struct pci_dev *pdev)
{
	acpi_handle dhandle;
	int retval = 0;

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

	if (!acpi_has_method(dhandle, "_DSM"))
		return false;

	if (acpi_check_dsm(dhandle, nouveau_dsm_muid, 0x00000102,
			   1 << NOUVEAU_DSM_POWER))
		retval |= NOUVEAU_DSM_HAS_MUX;

	if (nouveau_check_optimus_dsm(dhandle))
		retval |= NOUVEAU_DSM_HAS_OPT;

	if (retval & NOUVEAU_DSM_HAS_OPT) {
		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" : "");
	}
	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;
	}

	while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_3D << 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;
	}

	/* find the optimus DSM or the old v1 DSM */
	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;
	} else 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;
	}


	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)
		return;

	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

/* 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;
	len = min(len, (int)obj->buffer.length);
	memcpy(bios+offset, obj->buffer.pointer, len);
	kfree(buffer.pointer);
	return len;
}

bool nouveau_acpi_rom_supported(struct device *dev)
{
	acpi_status status;
	acpi_handle dhandle, rom_handle;

	dhandle = ACPI_HANDLE(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 = 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>
8116188f	4	#include <linux/mxm-wmi.h>
6a9ee8af	5	#include <linux/vga_switcheroo.h>
612a9aab	6	#include <drm/drm_edid.h>
8b48463f	7	#include <acpi/video.h>
c0077061 BS	8
	9	#include "nouveau_drm.h"
	10	#include "nouveau_acpi.h"
	11
6ee73861 BS	12	#define NOUVEAU_DSM_LED 0x02
	13	#define NOUVEAU_DSM_LED_STATE 0x00
	14	#define NOUVEAU_DSM_LED_OFF 0x10
	15	#define NOUVEAU_DSM_LED_STAMINA 0x11
	16	#define NOUVEAU_DSM_LED_SPEED 0x12
	17
	18	#define NOUVEAU_DSM_POWER 0x03
	19	#define NOUVEAU_DSM_POWER_STATE 0x00
	20	#define NOUVEAU_DSM_POWER_SPEED 0x01
	21	#define NOUVEAU_DSM_POWER_STAMINA 0x02
	22
5addcf0a DA	23	#define NOUVEAU_DSM_OPTIMUS_CAPS 0x1A
	24	#define NOUVEAU_DSM_OPTIMUS_FLAGS 0x1B
	25
	26	#define NOUVEAU_DSM_OPTIMUS_POWERDOWN_PS3 (3 << 24)
	27	#define NOUVEAU_DSM_OPTIMUS_NO_POWERDOWN_PS3 (2 << 24)
	28	#define NOUVEAU_DSM_OPTIMUS_FLAGS_CHANGED (1)
	29
	30	#define NOUVEAU_DSM_OPTIMUS_SET_POWERDOWN (NOUVEAU_DSM_OPTIMUS_POWERDOWN_PS3 \| NOUVEAU_DSM_OPTIMUS_FLAGS_CHANGED)
	31
	32	/* result of the optimus caps function */
	33	#define OPTIMUS_ENABLED (1 << 0)
	34	#define OPTIMUS_STATUS_MASK (3 << 3)
	35	#define OPTIMUS_STATUS_OFF (0 << 3)
	36	#define OPTIMUS_STATUS_ON_ENABLED (1 << 3)
	37	#define OPTIMUS_STATUS_PWR_STABLE (3 << 3)
	38	#define OPTIMUS_DISPLAY_HOTPLUG (1 << 6)
	39	#define OPTIMUS_CAPS_MASK (7 << 24)
	40	#define OPTIMUS_DYNAMIC_PWR_CAP (1 << 24)
	41
	42	#define OPTIMUS_AUDIO_CAPS_MASK (3 << 27)
	43	#define OPTIMUS_HDA_CODEC_MASK (2 << 27) /* hda bios control */
d099230c	44
6a9ee8af DA	45	static struct nouveau_dsm_priv {
6a9ee8af DA	46	bool dsm_detected;
f19467c5	47	bool optimus_detected;
6a9ee8af	48	acpi_handle dhandle;
afeb3e11	49	acpi_handle rom_handle;
6a9ee8af DA	50	} nouveau_dsm_priv;
6a9ee8af DA	51
c839d748 DA	52	bool nouveau_is_optimus(void) {
	53	return nouveau_dsm_priv.optimus_detected;
	54	}
	55
	56	bool nouveau_is_v1_dsm(void) {
	57	return nouveau_dsm_priv.dsm_detected;
	58	}
	59
f19467c5 DA	60	#define NOUVEAU_DSM_HAS_MUX 0x1
	61	#define NOUVEAU_DSM_HAS_OPT 0x2
	62
d0ce7b85	63	#ifdef CONFIG_VGA_SWITCHEROO
6a9ee8af DA	64	static const char nouveau_dsm_muid[] = {
	65	0xA0, 0xA0, 0x95, 0x9D, 0x60, 0x00, 0x48, 0x4D,
	66	0xB3, 0x4D, 0x7E, 0x5F, 0xEA, 0x12, 0x9F, 0xD4,
	67	};
6ee73861	68
f19467c5 DA	69	static const char nouveau_op_dsm_muid[] = {
	70	0xF8, 0xD8, 0x86, 0xA4, 0xDA, 0x0B, 0x1B, 0x47,
	71	0xA7, 0x2B, 0x60, 0x42, 0xA6, 0xB5, 0xBE, 0xE0,
	72	};
	73
	74	static int nouveau_optimus_dsm(acpi_handle handle, int func, int arg, uint32_t *result)
	75	{
b072e53b	76	int i;
f19467c5	77	union acpi_object *obj;
d099230c	78	char args_buff[4];
b072e53b JL	79	union acpi_object argv4 = {
	80	.buffer.type = ACPI_TYPE_BUFFER,
	81	.buffer.length = 4,
	82	.buffer.pointer = args_buff
	83	};
f19467c5	84
d099230c PL	85	/* ACPI is little endian, AABBCCDD becomes {DD,CC,BB,AA} */
	86	for (i = 0; i < 4; i++)
	87	args_buff[i] = (arg >> i * 8) & 0xFF;
f19467c5	88
b072e53b JL	89	*result = 0;
	90	obj = acpi_evaluate_dsm_typed(handle, nouveau_op_dsm_muid, 0x00000100,
	91	func, &argv4, ACPI_TYPE_BUFFER);
	92	if (!obj) {
	93	acpi_handle_info(handle, "failed to evaluate _DSM\n");
	94	return AE_ERROR;
	95	} else {
	96	if (obj->buffer.length == 4) {
f19467c5 DA	97	*result \|= obj->buffer.pointer[0];
	98	*result \|= (obj->buffer.pointer[1] << 8);
	99	*result \|= (obj->buffer.pointer[2] << 16);
	100	*result \|= (obj->buffer.pointer[3] << 24);
	101	}
b072e53b	102	ACPI_FREE(obj);
f19467c5 DA	103	}
f19467c5 DA	104
f19467c5 DA	105	return 0;
	106	}
	107
e284175a JL	108	/*
	109	* On some platforms, _DSM(nouveau_op_dsm_muid, func0) has special
	110	* requirements on the fourth parameter, so a private implementation
	111	* instead of using acpi_check_dsm().
	112	*/
	113	static int nouveau_check_optimus_dsm(acpi_handle handle)
	114	{
	115	int result;
	116
	117	/*
	118	* Function 0 returns a Buffer containing available functions.
	119	* The args parameter is ignored for function 0, so just put 0 in it
	120	*/
	121	if (nouveau_optimus_dsm(handle, 0, 0, &result))
	122	return 0;
	123
	124	/*
	125	* ACPI Spec v4 9.14.1: if bit 0 is zero, no function is supported.
	126	* If the n-th bit is enabled, function n is supported
	127	*/
	128	return result & 1 && result & (1 << NOUVEAU_DSM_OPTIMUS_CAPS);
	129	}
	130
b072e53b	131	static int nouveau_dsm(acpi_handle handle, int func, int arg)
6a9ee8af	132	{
b072e53b	133	int ret = 0;
6ee73861	134	union acpi_object *obj;
b072e53b JL	135	union acpi_object argv4 = {
	136	.integer.type = ACPI_TYPE_INTEGER,
	137	.integer.value = arg,
	138	};
	139
	140	obj = acpi_evaluate_dsm_typed(handle, nouveau_dsm_muid, 0x00000102,
	141	func, &argv4, ACPI_TYPE_INTEGER);
	142	if (!obj) {
	143	acpi_handle_info(handle, "failed to evaluate _DSM\n");
	144	return AE_ERROR;
	145	} else {
6ee73861	146	if (obj->integer.value == 0x80000002)
b072e53b JL	147	ret = -ENODEV;
b072e53b JL	148	ACPI_FREE(obj);
6ee73861 BS	149	}
6ee73861 BS	150
b072e53b	151	return ret;
9075e85f PL	152	}
9075e85f PL	153
6a9ee8af	154	static int nouveau_dsm_switch_mux(acpi_handle handle, int mux_id)
6ee73861	155	{
000703f4	156	mxm_wmi_call_mxmx(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0);
8116188f	157	mxm_wmi_call_mxds(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0);
b072e53b	158	return nouveau_dsm(handle, NOUVEAU_DSM_LED, mux_id);
6a9ee8af DA	159	}
	160
	161	static int nouveau_dsm_set_discrete_state(acpi_handle handle, enum vga_switcheroo_state state)
	162	{
	163	int arg;
	164	if (state == VGA_SWITCHEROO_ON)
	165	arg = NOUVEAU_DSM_POWER_SPEED;
	166	else
	167	arg = NOUVEAU_DSM_POWER_STAMINA;
b072e53b	168	nouveau_dsm(handle, NOUVEAU_DSM_POWER, arg);
6a9ee8af DA	169	return 0;
	170	}
	171
	172	static int nouveau_dsm_switchto(enum vga_switcheroo_client_id id)
	173	{
c839d748	174	if (!nouveau_dsm_priv.dsm_detected)
d099230c	175	return 0;
6a9ee8af	176	if (id == VGA_SWITCHEROO_IGD)
fc5ea29d	177	return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_STAMINA);
6a9ee8af	178	else
fc5ea29d	179	return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_SPEED);
6a9ee8af	180	}
6ee73861	181
6a9ee8af DA	182	static int nouveau_dsm_power_state(enum vga_switcheroo_client_id id,
	183	enum vga_switcheroo_state state)
	184	{
	185	if (id == VGA_SWITCHEROO_IGD)
	186	return 0;
	187
d099230c PL	188	/* Optimus laptops have the card already disabled in
d099230c PL	189	* nouveau_switcheroo_set_state */
c839d748	190	if (!nouveau_dsm_priv.dsm_detected)
d099230c PL	191	return 0;
d099230c PL	192
fc5ea29d	193	return nouveau_dsm_set_discrete_state(nouveau_dsm_priv.dhandle, state);
6a9ee8af DA	194	}
6a9ee8af DA	195
6a9ee8af	196	static int nouveau_dsm_get_client_id(struct pci_dev *pdev)
6ee73861	197	{
d1fbd923 DA	198	/* easy option one - intel vendor ID means Integrated */
d1fbd923 DA	199	if (pdev->vendor == PCI_VENDOR_ID_INTEL)
6a9ee8af	200	return VGA_SWITCHEROO_IGD;
d1fbd923 DA	201
	202	/* is this device on Bus 0? - this may need improving */
	203	if (pdev->bus->number == 0)
	204	return VGA_SWITCHEROO_IGD;
	205
	206	return VGA_SWITCHEROO_DIS;
6a9ee8af DA	207	}
6a9ee8af DA	208
5d170139	209	static const struct vga_switcheroo_handler nouveau_dsm_handler = {
6a9ee8af DA	210	.switchto = nouveau_dsm_switchto,
6a9ee8af DA	211	.power_state = nouveau_dsm_power_state,
6a9ee8af DA	212	.get_client_id = nouveau_dsm_get_client_id,
6a9ee8af DA	213	};
6ee73861	214
f19467c5	215	static int nouveau_dsm_pci_probe(struct pci_dev *pdev)
6a9ee8af	216	{
187b5b5d	217	acpi_handle dhandle;
9075e85f	218	int retval = 0;
6a9ee8af	219
3a83f992	220	dhandle = ACPI_HANDLE(&pdev->dev);
6a9ee8af DA	221	if (!dhandle)
6a9ee8af DA	222	return false;
afeb3e11	223
f91ce35e	224	if (!acpi_has_method(dhandle, "_DSM"))
6ee73861	225	return false;
f91ce35e	226
b072e53b JL	227	if (acpi_check_dsm(dhandle, nouveau_dsm_muid, 0x00000102,
b072e53b JL	228	1 << NOUVEAU_DSM_POWER))
f19467c5 DA	229	retval \|= NOUVEAU_DSM_HAS_MUX;
f19467c5 DA	230
e284175a	231	if (nouveau_check_optimus_dsm(dhandle))
f19467c5 DA	232	retval \|= NOUVEAU_DSM_HAS_OPT;
f19467c5 DA	233
5addcf0a DA	234	if (retval & NOUVEAU_DSM_HAS_OPT) {
	235	uint32_t result;
	236	nouveau_optimus_dsm(dhandle, NOUVEAU_DSM_OPTIMUS_CAPS, 0,
	237	&result);
	238	dev_info(&pdev->dev, "optimus capabilities: %s, status %s%s\n",
	239	(result & OPTIMUS_ENABLED) ? "enabled" : "disabled",
	240	(result & OPTIMUS_DYNAMIC_PWR_CAP) ? "dynamic power, " : "",
	241	(result & OPTIMUS_HDA_CODEC_MASK) ? "hda bios codec supported" : "");
	242	}
f19467c5 DA	243	if (retval)
f19467c5 DA	244	nouveau_dsm_priv.dhandle = dhandle;
6ee73861	245
f19467c5	246	return retval;
6ee73861	247	}
6a9ee8af DA	248
	249	static bool nouveau_dsm_detect(void)
	250	{
	251	char acpi_method_name[255] = { 0 };
	252	struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};
	253	struct pci_dev *pdev = NULL;
	254	int has_dsm = 0;
addde4ec	255	int has_optimus = 0;
6a9ee8af	256	int vga_count = 0;
8116188f	257	bool guid_valid;
f19467c5 DA	258	int retval;
f19467c5 DA	259	bool ret = false;
8116188f	260
f19467c5	261	/* lookup the MXM GUID */
8116188f	262	guid_valid = mxm_wmi_supported();
8116188f	263
f19467c5 DA	264	if (guid_valid)
f19467c5 DA	265	printk("MXM: GUID detected in BIOS\n");
afeb3e11	266
f19467c5	267	/* now do DSM detection */
6a9ee8af DA	268	while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
	269	vga_count++;
	270
f19467c5	271	retval = nouveau_dsm_pci_probe(pdev);
f19467c5 DA	272	if (retval & NOUVEAU_DSM_HAS_MUX)
	273	has_dsm \|= 1;
	274	if (retval & NOUVEAU_DSM_HAS_OPT)
	275	has_optimus = 1;
6a9ee8af DA	276	}
6a9ee8af DA	277
4c60fac1 EV	278	while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_3D << 8, pdev)) != NULL) {
	279	vga_count++;
	280
	281	retval = nouveau_dsm_pci_probe(pdev);
	282	if (retval & NOUVEAU_DSM_HAS_MUX)
	283	has_dsm \|= 1;
	284	if (retval & NOUVEAU_DSM_HAS_OPT)
	285	has_optimus = 1;
	286	}
	287
c839d748 DA	288	/* find the optimus DSM or the old v1 DSM */
c839d748 DA	289	if (has_optimus == 1) {
d099230c PL	290	acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME,
d099230c PL	291	&buffer);
c839d748	292	printk(KERN_INFO "VGA switcheroo: detected Optimus DSM method %s handle\n",
d099230c	293	acpi_method_name);
c839d748	294	nouveau_dsm_priv.optimus_detected = true;
f19467c5	295	ret = true;
c839d748	296	} else if (vga_count == 2 && has_dsm && guid_valid) {
d099230c PL	297	acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME,
d099230c PL	298	&buffer);
c839d748	299	printk(KERN_INFO "VGA switcheroo: detected DSM switching method %s handle\n",
d099230c	300	acpi_method_name);
c839d748	301	nouveau_dsm_priv.dsm_detected = true;
d099230c PL	302	ret = true;
d099230c PL	303	}
f19467c5	304
c839d748	305
f19467c5	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
156d7d41	317	vga_switcheroo_register_handler(&nouveau_dsm_handler, 0);
6a9ee8af DA	318	}
6a9ee8af DA	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
5addcf0a DA	327	nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_FLAGS,
	328	0x3, &result);
	329
	330	nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_CAPS,
	331	NOUVEAU_DSM_OPTIMUS_SET_POWERDOWN, &result);
	332
d099230c PL	333	}
d099230c PL	334
6a9ee8af DA	335	void nouveau_unregister_dsm_handler(void)
6a9ee8af DA	336	{
2f3787aa AH	337	if (nouveau_dsm_priv.optimus_detected \|\| nouveau_dsm_priv.dsm_detected)
2f3787aa AH	338	vga_switcheroo_unregister_handler();
6a9ee8af	339	}
d0ce7b85 JM	340	#else
	341	void nouveau_register_dsm_handler(void) {}
	342	void nouveau_unregister_dsm_handler(void) {}
	343	void nouveau_switcheroo_optimus_dsm(void) {}
	344	#endif
afeb3e11 DA	345
	346	/* retrieve the ROM in 4k blocks */
	347	static int nouveau_rom_call(acpi_handle rom_handle, uint8_t *bios,
	348	int offset, int len)
	349	{
	350	acpi_status status;
	351	union acpi_object rom_arg_elements[2], *obj;
	352	struct acpi_object_list rom_arg;
	353	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL};
	354
	355	rom_arg.count = 2;
	356	rom_arg.pointer = &rom_arg_elements[0];
	357
	358	rom_arg_elements[0].type = ACPI_TYPE_INTEGER;
	359	rom_arg_elements[0].integer.value = offset;
	360
	361	rom_arg_elements[1].type = ACPI_TYPE_INTEGER;
	362	rom_arg_elements[1].integer.value = len;
	363
	364	status = acpi_evaluate_object(rom_handle, NULL, &rom_arg, &buffer);
	365	if (ACPI_FAILURE(status)) {
	366	printk(KERN_INFO "failed to evaluate ROM got %s\n", acpi_format_exception(status));
	367	return -ENODEV;
	368	}
	369	obj = (union acpi_object *)buffer.pointer;
95432941	370	len = min(len, (int)obj->buffer.length);
afeb3e11 DA	371	memcpy(bios+offset, obj->buffer.pointer, len);
	372	kfree(buffer.pointer);
	373	return len;
	374	}
	375
26c9e8ef	376	bool nouveau_acpi_rom_supported(struct device *dev)
afeb3e11 DA	377	{
	378	acpi_status status;
	379	acpi_handle dhandle, rom_handle;
	380
26c9e8ef	381	dhandle = ACPI_HANDLE(dev);
afeb3e11 DA	382	if (!dhandle)
	383	return false;
	384
	385	status = acpi_get_handle(dhandle, "_ROM", &rom_handle);
	386	if (ACPI_FAILURE(status))
	387	return false;
	388
	389	nouveau_dsm_priv.rom_handle = rom_handle;
	390	return true;
	391	}
	392
	393	int nouveau_acpi_get_bios_chunk(uint8_t *bios, int offset, int len)
	394	{
	395	return nouveau_rom_call(nouveau_dsm_priv.rom_handle, bios, offset, len);
	396	}
a6ed76d7	397
c0077061	398	void *
a6ed76d7 BS	399	nouveau_acpi_edid(struct drm_device dev, struct drm_connector connector)
a6ed76d7 BS	400	{
a6ed76d7 BS	401	struct acpi_device *acpidev;
	402	acpi_handle handle;
	403	int type, ret;
	404	void *edid;
	405
	406	switch (connector->connector_type) {
	407	case DRM_MODE_CONNECTOR_LVDS:
	408	case DRM_MODE_CONNECTOR_eDP:
	409	type = ACPI_VIDEO_DISPLAY_LCD;
	410	break;
	411	default:
c0077061	412	return NULL;
a6ed76d7 BS	413	}
a6ed76d7 BS	414
3a83f992	415	handle = ACPI_HANDLE(&dev->pdev->dev);
a6ed76d7	416	if (!handle)
c0077061	417	return NULL;
a6ed76d7 BS	418
	419	ret = acpi_bus_get_device(handle, &acpidev);
	420	if (ret)
c0077061	421	return NULL;
a6ed76d7 BS	422
	423	ret = acpi_video_get_edid(acpidev, type, -1, &edid);
	424	if (ret < 0)
c0077061	425	return NULL;
a6ed76d7	426
c0077061	427	return kmemdup(edid, EDID_LENGTH, GFP_KERNEL);
a6ed76d7	428	}