[deliverable/linux.git] / drivers / gpu / drm / i915 / intel_acpi.c

/*
 * Intel ACPI functions
 *
 * _DSM related code stolen from nouveau_acpi.c.
 */
#include <linux/pci.h>
#include <linux/acpi.h>
#include <linux/vga_switcheroo.h>
#include <acpi/acpi_drivers.h>

#include <drm/drmP.h>
#include "i915_drv.h"

#define INTEL_DSM_REVISION_ID 1 /* For Calpella anyway... */

#define INTEL_DSM_FN_SUPPORTED_FUNCTIONS 0 /* No args */
#define INTEL_DSM_FN_PLATFORM_MUX_INFO 1 /* No args */

static struct intel_dsm_priv {
	acpi_handle dhandle;
} intel_dsm_priv;

static const u8 intel_dsm_guid[] = {
	0xd3, 0x73, 0xd8, 0x7e,
	0xd0, 0xc2,
	0x4f, 0x4e,
	0xa8, 0x54,
	0x0f, 0x13, 0x17, 0xb0, 0x1c, 0x2c
};

static int intel_dsm(acpi_handle handle, int func)
{
	struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
	struct acpi_object_list input;
	union acpi_object params[4];
	union acpi_object *obj;
	u32 result;
	int ret = 0;

	input.count = 4;
	input.pointer = params;
	params[0].type = ACPI_TYPE_BUFFER;
	params[0].buffer.length = sizeof(intel_dsm_guid);
	params[0].buffer.pointer = (char *)intel_dsm_guid;
	params[1].type = ACPI_TYPE_INTEGER;
	params[1].integer.value = INTEL_DSM_REVISION_ID;
	params[2].type = ACPI_TYPE_INTEGER;
	params[2].integer.value = func;
	params[3].type = ACPI_TYPE_PACKAGE;
	params[3].package.count = 0;
	params[3].package.elements = NULL;

	ret = acpi_evaluate_object(handle, "_DSM", &input, &output);
	if (ret) {
		DRM_DEBUG_DRIVER("failed to evaluate _DSM: %d\n", ret);
		return ret;
	}

	obj = (union acpi_object *)output.pointer;

	result = 0;
	switch (obj->type) {
	case ACPI_TYPE_INTEGER:
		result = obj->integer.value;
		break;

	case ACPI_TYPE_BUFFER:
		if (obj->buffer.length == 4) {
			result = (obj->buffer.pointer[0] |
				(obj->buffer.pointer[1] <<  8) |
				(obj->buffer.pointer[2] << 16) |
				(obj->buffer.pointer[3] << 24));
			break;
		}
	default:
		ret = -EINVAL;
		break;
	}
	if (result == 0x80000002)
		ret = -ENODEV;

	kfree(output.pointer);
	return ret;
}

static char *intel_dsm_port_name(u8 id)
{
	switch (id) {
	case 0:
		return "Reserved";
	case 1:
		return "Analog VGA";
	case 2:
		return "LVDS";
	case 3:
		return "Reserved";
	case 4:
		return "HDMI/DVI_B";
	case 5:
		return "HDMI/DVI_C";
	case 6:
		return "HDMI/DVI_D";
	case 7:
		return "DisplayPort_A";
	case 8:
		return "DisplayPort_B";
	case 9:
		return "DisplayPort_C";
	case 0xa:
		return "DisplayPort_D";
	case 0xb:
	case 0xc:
	case 0xd:
		return "Reserved";
	case 0xe:
		return "WiDi";
	default:
		return "bad type";
	}
}

static char *intel_dsm_mux_type(u8 type)
{
	switch (type) {
	case 0:
		return "unknown";
	case 1:
		return "No MUX, iGPU only";
	case 2:
		return "No MUX, dGPU only";
	case 3:
		return "MUXed between iGPU and dGPU";
	default:
		return "bad type";
	}
}

static void intel_dsm_platform_mux_info(void)
{
	struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
	struct acpi_object_list input;
	union acpi_object params[4];
	union acpi_object *pkg;
	int i, ret;

	input.count = 4;
	input.pointer = params;
	params[0].type = ACPI_TYPE_BUFFER;
	params[0].buffer.length = sizeof(intel_dsm_guid);
	params[0].buffer.pointer = (char *)intel_dsm_guid;
	params[1].type = ACPI_TYPE_INTEGER;
	params[1].integer.value = INTEL_DSM_REVISION_ID;
	params[2].type = ACPI_TYPE_INTEGER;
	params[2].integer.value = INTEL_DSM_FN_PLATFORM_MUX_INFO;
	params[3].type = ACPI_TYPE_PACKAGE;
	params[3].package.count = 0;
	params[3].package.elements = NULL;

	ret = acpi_evaluate_object(intel_dsm_priv.dhandle, "_DSM", &input,
				   &output);
	if (ret) {
		DRM_DEBUG_DRIVER("failed to evaluate _DSM: %d\n", ret);
		goto out;
	}

	pkg = (union acpi_object *)output.pointer;

	if (pkg->type == ACPI_TYPE_PACKAGE) {
		union acpi_object *connector_count = &pkg->package.elements[0];
		DRM_DEBUG_DRIVER("MUX info connectors: %lld\n",
			  (unsigned long long)connector_count->integer.value);
		for (i = 1; i < pkg->package.count; i++) {
			union acpi_object *obj = &pkg->package.elements[i];
			union acpi_object *connector_id =
				&obj->package.elements[0];
			union acpi_object *info = &obj->package.elements[1];
			DRM_DEBUG_DRIVER("Connector id: 0x%016llx\n",
				  (unsigned long long)connector_id->integer.value);
			DRM_DEBUG_DRIVER("  port id: %s\n",
			       intel_dsm_port_name(info->buffer.pointer[0]));
			DRM_DEBUG_DRIVER("  display mux info: %s\n",
			       intel_dsm_mux_type(info->buffer.pointer[1]));
			DRM_DEBUG_DRIVER("  aux/dc mux info: %s\n",
			       intel_dsm_mux_type(info->buffer.pointer[2]));
			DRM_DEBUG_DRIVER("  hpd mux info: %s\n",
			       intel_dsm_mux_type(info->buffer.pointer[3]));
		}
	}

out:
	kfree(output.pointer);
}

static bool intel_dsm_pci_probe(struct pci_dev *pdev)
{
	acpi_handle dhandle;
	int ret;

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

	if (!acpi_has_method(dhandle, "_DSM")) {
		DRM_DEBUG_KMS("no _DSM method for intel device\n");
		return false;
	}

	ret = intel_dsm(dhandle, INTEL_DSM_FN_SUPPORTED_FUNCTIONS);
	if (ret < 0) {
		DRM_DEBUG_KMS("failed to get supported _DSM functions\n");
		return false;
	}

	intel_dsm_priv.dhandle = dhandle;

	intel_dsm_platform_mux_info();
	return true;
}

static bool intel_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;
	bool has_dsm = false;
	int vga_count = 0;

	while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
		vga_count++;
		has_dsm |= intel_dsm_pci_probe(pdev);
	}

	if (vga_count == 2 && has_dsm) {
		acpi_get_name(intel_dsm_priv.dhandle, ACPI_FULL_PATHNAME, &buffer);
		DRM_DEBUG_DRIVER("VGA switcheroo: detected DSM switching method %s handle\n",
				 acpi_method_name);
		return true;
	}

	return false;
}

void intel_register_dsm_handler(void)
{
	if (!intel_dsm_detect())
		return;
}

void intel_unregister_dsm_handler(void)
{
}
Commit	Line	Data
723bfd70 JB	1	/*
	2	* Intel ACPI functions
	3	*
	4	* _DSM related code stolen from nouveau_acpi.c.
	5	*/
	6	#include <linux/pci.h>
	7	#include <linux/acpi.h>
	8	#include <linux/vga_switcheroo.h>
	9	#include <acpi/acpi_drivers.h>
	10
760285e7	11	#include <drm/drmP.h>
c43b5634	12	#include "i915_drv.h"
723bfd70 JB	13
	14	#define INTEL_DSM_REVISION_ID 1 /* For Calpella anyway... */
	15
	16	#define INTEL_DSM_FN_SUPPORTED_FUNCTIONS 0 /* No args */
	17	#define INTEL_DSM_FN_PLATFORM_MUX_INFO 1 /* No args */
	18
	19	static struct intel_dsm_priv {
	20	acpi_handle dhandle;
	21	} intel_dsm_priv;
	22
	23	static const u8 intel_dsm_guid[] = {
	24	0xd3, 0x73, 0xd8, 0x7e,
	25	0xd0, 0xc2,
	26	0x4f, 0x4e,
	27	0xa8, 0x54,
	28	0x0f, 0x13, 0x17, 0xb0, 0x1c, 0x2c
	29	};
	30
6d5c2d8c	31	static int intel_dsm(acpi_handle handle, int func)
723bfd70 JB	32	{
	33	struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
	34	struct acpi_object_list input;
	35	union acpi_object params[4];
	36	union acpi_object *obj;
	37	u32 result;
	38	int ret = 0;
	39
	40	input.count = 4;
	41	input.pointer = params;
	42	params[0].type = ACPI_TYPE_BUFFER;
	43	params[0].buffer.length = sizeof(intel_dsm_guid);
	44	params[0].buffer.pointer = (char *)intel_dsm_guid;
	45	params[1].type = ACPI_TYPE_INTEGER;
	46	params[1].integer.value = INTEL_DSM_REVISION_ID;
	47	params[2].type = ACPI_TYPE_INTEGER;
	48	params[2].integer.value = func;
6d5c2d8c PW	49	params[3].type = ACPI_TYPE_PACKAGE;
	50	params[3].package.count = 0;
	51	params[3].package.elements = NULL;
723bfd70 JB	52
	53	ret = acpi_evaluate_object(handle, "_DSM", &input, &output);
	54	if (ret) {
	55	DRM_DEBUG_DRIVER("failed to evaluate _DSM: %d\n", ret);
	56	return ret;
	57	}
	58
	59	obj = (union acpi_object *)output.pointer;
	60
	61	result = 0;
	62	switch (obj->type) {
	63	case ACPI_TYPE_INTEGER:
	64	result = obj->integer.value;
	65	break;
	66
	67	case ACPI_TYPE_BUFFER:
	68	if (obj->buffer.length == 4) {
0206e353	69	result = (obj->buffer.pointer[0] \|
723bfd70 JB	70	(obj->buffer.pointer[1] << 8) \|
	71	(obj->buffer.pointer[2] << 16) \|
	72	(obj->buffer.pointer[3] << 24));
	73	break;
	74	}
	75	default:
	76	ret = -EINVAL;
	77	break;
	78	}
	79	if (result == 0x80000002)
	80	ret = -ENODEV;
	81
	82	kfree(output.pointer);
	83	return ret;
	84	}
	85
	86	static char *intel_dsm_port_name(u8 id)
	87	{
	88	switch (id) {
	89	case 0:
	90	return "Reserved";
	91	case 1:
	92	return "Analog VGA";
	93	case 2:
	94	return "LVDS";
	95	case 3:
	96	return "Reserved";
	97	case 4:
	98	return "HDMI/DVI_B";
	99	case 5:
	100	return "HDMI/DVI_C";
	101	case 6:
	102	return "HDMI/DVI_D";
	103	case 7:
	104	return "DisplayPort_A";
	105	case 8:
	106	return "DisplayPort_B";
	107	case 9:
	108	return "DisplayPort_C";
	109	case 0xa:
	110	return "DisplayPort_D";
	111	case 0xb:
	112	case 0xc:
	113	case 0xd:
	114	return "Reserved";
	115	case 0xe:
	116	return "WiDi";
	117	default:
	118	return "bad type";
	119	}
	120	}
	121
	122	static char *intel_dsm_mux_type(u8 type)
	123	{
	124	switch (type) {
	125	case 0:
	126	return "unknown";
	127	case 1:
	128	return "No MUX, iGPU only";
	129	case 2:
	130	return "No MUX, dGPU only";
	131	case 3:
	132	return "MUXed between iGPU and dGPU";
	133	default:
134	return "bad type";
135	}
136	}
137
138	static void intel_dsm_platform_mux_info(void)
139	{
140	struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
141	struct acpi_object_list input;
142	union acpi_object params[4];
143	union acpi_object *pkg;
144	int i, ret;
145
146	input.count = 4;
147	input.pointer = params;
148	params[0].type = ACPI_TYPE_BUFFER;
149	params[0].buffer.length = sizeof(intel_dsm_guid);
150	params[0].buffer.pointer = (char *)intel_dsm_guid;
151	params[1].type = ACPI_TYPE_INTEGER;
152	params[1].integer.value = INTEL_DSM_REVISION_ID;
153	params[2].type = ACPI_TYPE_INTEGER;
154	params[2].integer.value = INTEL_DSM_FN_PLATFORM_MUX_INFO;
6d5c2d8c PW	155	params[3].type = ACPI_TYPE_PACKAGE;
	156	params[3].package.count = 0;
	157	params[3].package.elements = NULL;
723bfd70 JB	158
	159	ret = acpi_evaluate_object(intel_dsm_priv.dhandle, "_DSM", &input,
	160	&output);
	161	if (ret) {
	162	DRM_DEBUG_DRIVER("failed to evaluate _DSM: %d\n", ret);
	163	goto out;
	164	}
	165
	166	pkg = (union acpi_object *)output.pointer;
	167
	168	if (pkg->type == ACPI_TYPE_PACKAGE) {
	169	union acpi_object *connector_count = &pkg->package.elements[0];
	170	DRM_DEBUG_DRIVER("MUX info connectors: %lld\n",
	171	(unsigned long long)connector_count->integer.value);
	172	for (i = 1; i < pkg->package.count; i++) {
	173	union acpi_object *obj = &pkg->package.elements[i];
	174	union acpi_object *connector_id =
	175	&obj->package.elements[0];
	176	union acpi_object *info = &obj->package.elements[1];
	177	DRM_DEBUG_DRIVER("Connector id: 0x%016llx\n",
	178	(unsigned long long)connector_id->integer.value);
	179	DRM_DEBUG_DRIVER(" port id: %s\n",
	180	intel_dsm_port_name(info->buffer.pointer[0]));
	181	DRM_DEBUG_DRIVER(" display mux info: %s\n",
	182	intel_dsm_mux_type(info->buffer.pointer[1]));
	183	DRM_DEBUG_DRIVER(" aux/dc mux info: %s\n",
	184	intel_dsm_mux_type(info->buffer.pointer[2]));
	185	DRM_DEBUG_DRIVER(" hpd mux info: %s\n",
	186	intel_dsm_mux_type(info->buffer.pointer[3]));
	187	}
723bfd70 JB	188	}
	189
	190	out:
	191	kfree(output.pointer);
	192	}
	193
723bfd70 JB	194	static bool intel_dsm_pci_probe(struct pci_dev *pdev)
723bfd70 JB	195	{
2a3ca142	196	acpi_handle dhandle;
723bfd70 JB	197	int ret;
723bfd70 JB	198
3a83f992	199	dhandle = ACPI_HANDLE(&pdev->dev);
723bfd70 JB	200	if (!dhandle)
	201	return false;
	202
2a3ca142	203	if (!acpi_has_method(dhandle, "_DSM")) {
723bfd70 JB	204	DRM_DEBUG_KMS("no _DSM method for intel device\n");
	205	return false;
	206	}
	207
6d5c2d8c	208	ret = intel_dsm(dhandle, INTEL_DSM_FN_SUPPORTED_FUNCTIONS);
723bfd70	209	if (ret < 0) {
0b8ecdda	210	DRM_DEBUG_KMS("failed to get supported _DSM functions\n");
723bfd70 JB	211	return false;
	212	}
	213
	214	intel_dsm_priv.dhandle = dhandle;
	215
	216	intel_dsm_platform_mux_info();
	217	return true;
	218	}
	219
	220	static bool intel_dsm_detect(void)
	221	{
	222	char acpi_method_name[255] = { 0 };
	223	struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};
	224	struct pci_dev *pdev = NULL;
	225	bool has_dsm = false;
	226	int vga_count = 0;
	227
	228	while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
	229	vga_count++;
	230	has_dsm \|= intel_dsm_pci_probe(pdev);
	231	}
	232
	233	if (vga_count == 2 && has_dsm) {
	234	acpi_get_name(intel_dsm_priv.dhandle, ACPI_FULL_PATHNAME, &buffer);
	235	DRM_DEBUG_DRIVER("VGA switcheroo: detected DSM switching method %s handle\n",
	236	acpi_method_name);
	237	return true;
	238	}
	239
	240	return false;
	241	}
	242
	243	void intel_register_dsm_handler(void)
	244	{
	245	if (!intel_dsm_detect())
	246	return;
723bfd70 JB	247	}
	248
	249	void intel_unregister_dsm_handler(void)
	250	{
723bfd70	251	}