[mirror_ubuntu-artful-kernel.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

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)
{
	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 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 (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_CAPS))
		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);
}

/* 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();
}

/* 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 = 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 = 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
6a9ee8af DA	63	static const char nouveau_dsm_muid[] = {
	64	0xA0, 0xA0, 0x95, 0x9D, 0x60, 0x00, 0x48, 0x4D,
	65	0xB3, 0x4D, 0x7E, 0x5F, 0xEA, 0x12, 0x9F, 0xD4,
	66	};
6ee73861	67
f19467c5 DA	68	static const char nouveau_op_dsm_muid[] = {
	69	0xF8, 0xD8, 0x86, 0xA4, 0xDA, 0x0B, 0x1B, 0x47,
	70	0xA7, 0x2B, 0x60, 0x42, 0xA6, 0xB5, 0xBE, 0xE0,
	71	};
	72
	73	static int nouveau_optimus_dsm(acpi_handle handle, int func, int arg, uint32_t *result)
	74	{
	75	struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
	76	struct acpi_object_list input;
	77	union acpi_object params[4];
	78	union acpi_object *obj;
d099230c PL	79	int i, err;
d099230c PL	80	char args_buff[4];
f19467c5 DA	81
	82	input.count = 4;
	83	input.pointer = params;
	84	params[0].type = ACPI_TYPE_BUFFER;
	85	params[0].buffer.length = sizeof(nouveau_op_dsm_muid);
	86	params[0].buffer.pointer = (char *)nouveau_op_dsm_muid;
	87	params[1].type = ACPI_TYPE_INTEGER;
	88	params[1].integer.value = 0x00000100;
	89	params[2].type = ACPI_TYPE_INTEGER;
	90	params[2].integer.value = func;
	91	params[3].type = ACPI_TYPE_BUFFER;
d099230c PL	92	params[3].buffer.length = 4;
	93	/* ACPI is little endian, AABBCCDD becomes {DD,CC,BB,AA} */
	94	for (i = 0; i < 4; i++)
	95	args_buff[i] = (arg >> i * 8) & 0xFF;
	96	params[3].buffer.pointer = args_buff;
f19467c5 DA	97
	98	err = acpi_evaluate_object(handle, "_DSM", &input, &output);
	99	if (err) {
	100	printk(KERN_INFO "failed to evaluate _DSM: %d\n", err);
	101	return err;
	102	}
	103
	104	obj = (union acpi_object *)output.pointer;
	105
	106	if (obj->type == ACPI_TYPE_INTEGER)
	107	if (obj->integer.value == 0x80000002) {
	108	return -ENODEV;
	109	}
	110
	111	if (obj->type == ACPI_TYPE_BUFFER) {
	112	if (obj->buffer.length == 4 && result) {
	113	*result = 0;
	114	*result \|= obj->buffer.pointer[0];
	115	*result \|= (obj->buffer.pointer[1] << 8);
	116	*result \|= (obj->buffer.pointer[2] << 16);
	117	*result \|= (obj->buffer.pointer[3] << 24);
	118	}
	119	}
	120
	121	kfree(output.pointer);
	122	return 0;
	123	}
	124
6e86e041	125	static int nouveau_dsm(acpi_handle handle, int func, int arg, uint32_t *result)
6a9ee8af	126	{
6ee73861 BS	127	struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
	128	struct acpi_object_list input;
	129	union acpi_object params[4];
	130	union acpi_object *obj;
	131	int err;
	132
6ee73861 BS	133	input.count = 4;
	134	input.pointer = params;
	135	params[0].type = ACPI_TYPE_BUFFER;
6a9ee8af DA	136	params[0].buffer.length = sizeof(nouveau_dsm_muid);
6a9ee8af DA	137	params[0].buffer.pointer = (char *)nouveau_dsm_muid;
6ee73861 BS	138	params[1].type = ACPI_TYPE_INTEGER;
	139	params[1].integer.value = 0x00000102;
	140	params[2].type = ACPI_TYPE_INTEGER;
	141	params[2].integer.value = func;
	142	params[3].type = ACPI_TYPE_INTEGER;
	143	params[3].integer.value = arg;
	144
	145	err = acpi_evaluate_object(handle, "_DSM", &input, &output);
	146	if (err) {
6a9ee8af	147	printk(KERN_INFO "failed to evaluate _DSM: %d\n", err);
6ee73861 BS	148	return err;
	149	}
	150
	151	obj = (union acpi_object *)output.pointer;
	152
	153	if (obj->type == ACPI_TYPE_INTEGER)
	154	if (obj->integer.value == 0x80000002)
	155	return -ENODEV;
	156
	157	if (obj->type == ACPI_TYPE_BUFFER) {
	158	if (obj->buffer.length == 4 && result) {
	159	*result = 0;
	160	*result \|= obj->buffer.pointer[0];
	161	*result \|= (obj->buffer.pointer[1] << 8);
	162	*result \|= (obj->buffer.pointer[2] << 16);
	163	*result \|= (obj->buffer.pointer[3] << 24);
	164	}
	165	}
	166
	167	kfree(output.pointer);
	168	return 0;
	169	}
	170
9075e85f PL	171	/* Returns 1 if a DSM function is usable and 0 otherwise */
	172	static int nouveau_test_dsm(acpi_handle test_handle,
	173	int (dsm_func)(acpi_handle, int, int, uint32_t ),
	174	int sfnc)
	175	{
	176	u32 result = 0;
	177
	178	/* Function 0 returns a Buffer containing available functions. The args
	179	* parameter is ignored for function 0, so just put 0 in it */
	180	if (dsm_func(test_handle, 0, 0, &result))
	181	return 0;
	182
	183	/* ACPI Spec v4 9.14.1: if bit 0 is zero, no function is supported. If
	184	* the n-th bit is enabled, function n is supported */
	185	return result & 1 && result & (1 << sfnc);
	186	}
	187
6a9ee8af	188	static int nouveau_dsm_switch_mux(acpi_handle handle, int mux_id)
6ee73861	189	{
000703f4	190	mxm_wmi_call_mxmx(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0);
8116188f	191	mxm_wmi_call_mxds(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0);
6a9ee8af DA	192	return nouveau_dsm(handle, NOUVEAU_DSM_LED, mux_id, NULL);
	193	}
	194
	195	static int nouveau_dsm_set_discrete_state(acpi_handle handle, enum vga_switcheroo_state state)
	196	{
	197	int arg;
	198	if (state == VGA_SWITCHEROO_ON)
	199	arg = NOUVEAU_DSM_POWER_SPEED;
	200	else
	201	arg = NOUVEAU_DSM_POWER_STAMINA;
	202	nouveau_dsm(handle, NOUVEAU_DSM_POWER, arg, NULL);
	203	return 0;
	204	}
	205
	206	static int nouveau_dsm_switchto(enum vga_switcheroo_client_id id)
	207	{
c839d748	208	if (!nouveau_dsm_priv.dsm_detected)
d099230c	209	return 0;
6a9ee8af	210	if (id == VGA_SWITCHEROO_IGD)
fc5ea29d	211	return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_STAMINA);
6a9ee8af	212	else
fc5ea29d	213	return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_SPEED);
6a9ee8af	214	}
6ee73861	215
6a9ee8af DA	216	static int nouveau_dsm_power_state(enum vga_switcheroo_client_id id,
	217	enum vga_switcheroo_state state)
	218	{
	219	if (id == VGA_SWITCHEROO_IGD)
	220	return 0;
	221
d099230c PL	222	/* Optimus laptops have the card already disabled in
d099230c PL	223	* nouveau_switcheroo_set_state */
c839d748	224	if (!nouveau_dsm_priv.dsm_detected)
d099230c PL	225	return 0;
d099230c PL	226
fc5ea29d	227	return nouveau_dsm_set_discrete_state(nouveau_dsm_priv.dhandle, state);
6a9ee8af DA	228	}
6a9ee8af DA	229
6a9ee8af	230	static int nouveau_dsm_get_client_id(struct pci_dev *pdev)
6ee73861	231	{
d1fbd923 DA	232	/* easy option one - intel vendor ID means Integrated */
d1fbd923 DA	233	if (pdev->vendor == PCI_VENDOR_ID_INTEL)
6a9ee8af	234	return VGA_SWITCHEROO_IGD;
d1fbd923 DA	235
	236	/* is this device on Bus 0? - this may need improving */
	237	if (pdev->bus->number == 0)
	238	return VGA_SWITCHEROO_IGD;
	239
	240	return VGA_SWITCHEROO_DIS;
6a9ee8af DA	241	}
	242
	243	static struct vga_switcheroo_handler nouveau_dsm_handler = {
	244	.switchto = nouveau_dsm_switchto,
	245	.power_state = nouveau_dsm_power_state,
6a9ee8af DA	246	.get_client_id = nouveau_dsm_get_client_id,
6a9ee8af DA	247	};
6ee73861	248
f19467c5	249	static int nouveau_dsm_pci_probe(struct pci_dev *pdev)
6a9ee8af	250	{
187b5b5d	251	acpi_handle dhandle;
9075e85f	252	int retval = 0;
6a9ee8af	253
3a83f992	254	dhandle = ACPI_HANDLE(&pdev->dev);
6a9ee8af DA	255	if (!dhandle)
6a9ee8af DA	256	return false;
afeb3e11	257
187b5b5d	258	if (!acpi_has_method(dhandle, "_DSM"))
6ee73861 BS	259	return false;
6ee73861 BS	260
9075e85f	261	if (nouveau_test_dsm(dhandle, nouveau_dsm, NOUVEAU_DSM_POWER))
f19467c5 DA	262	retval \|= NOUVEAU_DSM_HAS_MUX;
f19467c5 DA	263
9075e85f	264	if (nouveau_test_dsm(dhandle, nouveau_optimus_dsm,
5addcf0a	265	NOUVEAU_DSM_OPTIMUS_CAPS))
f19467c5 DA	266	retval \|= NOUVEAU_DSM_HAS_OPT;
f19467c5 DA	267
5addcf0a DA	268	if (retval & NOUVEAU_DSM_HAS_OPT) {
	269	uint32_t result;
	270	nouveau_optimus_dsm(dhandle, NOUVEAU_DSM_OPTIMUS_CAPS, 0,
	271	&result);
	272	dev_info(&pdev->dev, "optimus capabilities: %s, status %s%s\n",
	273	(result & OPTIMUS_ENABLED) ? "enabled" : "disabled",
	274	(result & OPTIMUS_DYNAMIC_PWR_CAP) ? "dynamic power, " : "",
	275	(result & OPTIMUS_HDA_CODEC_MASK) ? "hda bios codec supported" : "");
	276	}
f19467c5 DA	277	if (retval)
f19467c5 DA	278	nouveau_dsm_priv.dhandle = dhandle;
6ee73861	279
f19467c5	280	return retval;
6ee73861	281	}
6a9ee8af DA	282
	283	static bool nouveau_dsm_detect(void)
	284	{
	285	char acpi_method_name[255] = { 0 };
	286	struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};
	287	struct pci_dev *pdev = NULL;
	288	int has_dsm = 0;
addde4ec	289	int has_optimus = 0;
6a9ee8af	290	int vga_count = 0;
8116188f	291	bool guid_valid;
f19467c5 DA	292	int retval;
f19467c5 DA	293	bool ret = false;
8116188f	294
f19467c5	295	/* lookup the MXM GUID */
8116188f	296	guid_valid = mxm_wmi_supported();
8116188f	297
f19467c5 DA	298	if (guid_valid)
f19467c5 DA	299	printk("MXM: GUID detected in BIOS\n");
afeb3e11	300
f19467c5	301	/* now do DSM detection */
6a9ee8af DA	302	while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
	303	vga_count++;
	304
f19467c5	305	retval = nouveau_dsm_pci_probe(pdev);
f19467c5 DA	306	if (retval & NOUVEAU_DSM_HAS_MUX)
	307	has_dsm \|= 1;
	308	if (retval & NOUVEAU_DSM_HAS_OPT)
	309	has_optimus = 1;
6a9ee8af DA	310	}
6a9ee8af DA	311
4c60fac1 EV	312	while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_3D << 8, pdev)) != NULL) {
	313	vga_count++;
	314
	315	retval = nouveau_dsm_pci_probe(pdev);
	316	if (retval & NOUVEAU_DSM_HAS_MUX)
	317	has_dsm \|= 1;
	318	if (retval & NOUVEAU_DSM_HAS_OPT)
	319	has_optimus = 1;
	320	}
	321
c839d748 DA	322	/* find the optimus DSM or the old v1 DSM */
c839d748 DA	323	if (has_optimus == 1) {
d099230c PL	324	acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME,
d099230c PL	325	&buffer);
c839d748	326	printk(KERN_INFO "VGA switcheroo: detected Optimus DSM method %s handle\n",
d099230c	327	acpi_method_name);
c839d748	328	nouveau_dsm_priv.optimus_detected = true;
f19467c5	329	ret = true;
c839d748	330	} else if (vga_count == 2 && has_dsm && guid_valid) {
d099230c PL	331	acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME,
d099230c PL	332	&buffer);
c839d748	333	printk(KERN_INFO "VGA switcheroo: detected DSM switching method %s handle\n",
d099230c	334	acpi_method_name);
c839d748	335	nouveau_dsm_priv.dsm_detected = true;
d099230c PL	336	ret = true;
d099230c PL	337	}
f19467c5	338
c839d748	339
f19467c5	340	return ret;
6a9ee8af DA	341	}
	342
	343	void nouveau_register_dsm_handler(void)
	344	{
	345	bool r;
	346
	347	r = nouveau_dsm_detect();
	348	if (!r)
	349	return;
	350
	351	vga_switcheroo_register_handler(&nouveau_dsm_handler);
	352	}
	353
d099230c PL	354	/* Must be called for Optimus models before the card can be turned off */
	355	void nouveau_switcheroo_optimus_dsm(void)
	356	{
	357	u32 result = 0;
	358	if (!nouveau_dsm_priv.optimus_detected)
	359	return;
	360
5addcf0a DA	361	nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_FLAGS,
	362	0x3, &result);
	363
	364	nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_CAPS,
	365	NOUVEAU_DSM_OPTIMUS_SET_POWERDOWN, &result);
	366
d099230c PL	367	}
d099230c PL	368
6a9ee8af DA	369	void nouveau_unregister_dsm_handler(void)
6a9ee8af DA	370	{
2f3787aa AH	371	if (nouveau_dsm_priv.optimus_detected \|\| nouveau_dsm_priv.dsm_detected)
2f3787aa AH	372	vga_switcheroo_unregister_handler();
6a9ee8af	373	}
afeb3e11 DA	374
	375	/* retrieve the ROM in 4k blocks */
	376	static int nouveau_rom_call(acpi_handle rom_handle, uint8_t *bios,
	377	int offset, int len)
	378	{
	379	acpi_status status;
	380	union acpi_object rom_arg_elements[2], *obj;
	381	struct acpi_object_list rom_arg;
	382	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL};
	383
	384	rom_arg.count = 2;
	385	rom_arg.pointer = &rom_arg_elements[0];
	386
	387	rom_arg_elements[0].type = ACPI_TYPE_INTEGER;
	388	rom_arg_elements[0].integer.value = offset;
	389
	390	rom_arg_elements[1].type = ACPI_TYPE_INTEGER;
	391	rom_arg_elements[1].integer.value = len;
	392
	393	status = acpi_evaluate_object(rom_handle, NULL, &rom_arg, &buffer);
	394	if (ACPI_FAILURE(status)) {
	395	printk(KERN_INFO "failed to evaluate ROM got %s\n", acpi_format_exception(status));
	396	return -ENODEV;
	397	}
	398	obj = (union acpi_object *)buffer.pointer;
	399	memcpy(bios+offset, obj->buffer.pointer, len);
	400	kfree(buffer.pointer);
	401	return len;
	402	}
	403
	404	bool nouveau_acpi_rom_supported(struct pci_dev *pdev)
	405	{
	406	acpi_status status;
	407	acpi_handle dhandle, rom_handle;
	408
f19467c5	409	if (!nouveau_dsm_priv.dsm_detected && !nouveau_dsm_priv.optimus_detected)
afeb3e11 DA	410	return false;
afeb3e11 DA	411
3a83f992	412	dhandle = ACPI_HANDLE(&pdev->dev);
afeb3e11 DA	413	if (!dhandle)
	414	return false;
	415
	416	status = acpi_get_handle(dhandle, "_ROM", &rom_handle);
	417	if (ACPI_FAILURE(status))
	418	return false;
	419
	420	nouveau_dsm_priv.rom_handle = rom_handle;
	421	return true;
	422	}
	423
	424	int nouveau_acpi_get_bios_chunk(uint8_t *bios, int offset, int len)
	425	{
	426	return nouveau_rom_call(nouveau_dsm_priv.rom_handle, bios, offset, len);
	427	}
a6ed76d7	428
c0077061	429	void *
a6ed76d7 BS	430	nouveau_acpi_edid(struct drm_device dev, struct drm_connector connector)
a6ed76d7 BS	431	{
a6ed76d7 BS	432	struct acpi_device *acpidev;
	433	acpi_handle handle;
	434	int type, ret;
	435	void *edid;
	436
	437	switch (connector->connector_type) {
	438	case DRM_MODE_CONNECTOR_LVDS:
	439	case DRM_MODE_CONNECTOR_eDP:
	440	type = ACPI_VIDEO_DISPLAY_LCD;
	441	break;
	442	default:
c0077061	443	return NULL;
a6ed76d7 BS	444	}
a6ed76d7 BS	445
3a83f992	446	handle = ACPI_HANDLE(&dev->pdev->dev);
a6ed76d7	447	if (!handle)
c0077061	448	return NULL;
a6ed76d7 BS	449
	450	ret = acpi_bus_get_device(handle, &acpidev);
	451	if (ret)
c0077061	452	return NULL;
a6ed76d7 BS	453
	454	ret = acpi_video_get_edid(acpidev, type, -1, &edid);
	455	if (ret < 0)
c0077061	456	return NULL;
a6ed76d7	457
c0077061	458	return kmemdup(edid, EDID_LENGTH, GFP_KERNEL);
a6ed76d7	459	}