[mirror_ubuntu-artful-kernel.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 <drm/drmP.h>
#include "i915_drv.h"

#define INTEL_DSM_REVISION_ID 1 /* For Calpella anyway... */
#define INTEL_DSM_FN_PLATFORM_MUX_INFO 1 /* No args */

static struct intel_dsm_priv {
	acpi_handle dhandle;
} intel_dsm_priv;

static const guid_t intel_dsm_guid =
	GUID_INIT(0x7ed873d3, 0xc2d0, 0x4e4f,
		  0xa8, 0x54, 0x0f, 0x13, 0x17, 0xb0, 0x1c, 0x2c);

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)
{
	int i;
	union acpi_object *pkg, *connector_count;

	pkg = acpi_evaluate_dsm_typed(intel_dsm_priv.dhandle, &intel_dsm_guid,
			INTEL_DSM_REVISION_ID, INTEL_DSM_FN_PLATFORM_MUX_INFO,
			NULL, ACPI_TYPE_PACKAGE);
	if (!pkg) {
		DRM_DEBUG_DRIVER("failed to evaluate _DSM\n");
		return;
	}

	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]));
	}

	ACPI_FREE(pkg);
}

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

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

	if (!acpi_check_dsm(dhandle, &intel_dsm_guid, INTEL_DSM_REVISION_ID,
			    1 << INTEL_DSM_FN_PLATFORM_MUX_INFO)) {
		DRM_DEBUG_KMS("no _DSM method for intel device\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>
760285e7	8	#include <drm/drmP.h>
c43b5634	9	#include "i915_drv.h"
723bfd70 JB	10
723bfd70 JB	11	#define INTEL_DSM_REVISION_ID 1 /* For Calpella anyway... */
723bfd70 JB	12	#define INTEL_DSM_FN_PLATFORM_MUX_INFO 1 /* No args */
	13
	14	static struct intel_dsm_priv {
	15	acpi_handle dhandle;
	16	} intel_dsm_priv;
	17
94116f81 AS	18	static const guid_t intel_dsm_guid =
	19	GUID_INIT(0x7ed873d3, 0xc2d0, 0x4e4f,
	20	0xa8, 0x54, 0x0f, 0x13, 0x17, 0xb0, 0x1c, 0x2c);
723bfd70	21
723bfd70 JB	22	static char *intel_dsm_port_name(u8 id)
	23	{
	24	switch (id) {
	25	case 0:
	26	return "Reserved";
	27	case 1:
	28	return "Analog VGA";
	29	case 2:
	30	return "LVDS";
	31	case 3:
	32	return "Reserved";
	33	case 4:
	34	return "HDMI/DVI_B";
	35	case 5:
	36	return "HDMI/DVI_C";
	37	case 6:
	38	return "HDMI/DVI_D";
	39	case 7:
	40	return "DisplayPort_A";
	41	case 8:
	42	return "DisplayPort_B";
	43	case 9:
	44	return "DisplayPort_C";
	45	case 0xa:
	46	return "DisplayPort_D";
	47	case 0xb:
	48	case 0xc:
	49	case 0xd:
	50	return "Reserved";
	51	case 0xe:
	52	return "WiDi";
	53	default:
	54	return "bad type";
	55	}
	56	}
	57
	58	static char *intel_dsm_mux_type(u8 type)
	59	{
	60	switch (type) {
	61	case 0:
	62	return "unknown";
	63	case 1:
	64	return "No MUX, iGPU only";
	65	case 2:
	66	return "No MUX, dGPU only";
	67	case 3:
	68	return "MUXed between iGPU and dGPU";
	69	default:
	70	return "bad type";
	71	}
	72	}
	73
	74	static void intel_dsm_platform_mux_info(void)
	75	{
d5c3d79e JL	76	int i;
	77	union acpi_object pkg, connector_count;
	78
94116f81	79	pkg = acpi_evaluate_dsm_typed(intel_dsm_priv.dhandle, &intel_dsm_guid,
d5c3d79e JL	80	INTEL_DSM_REVISION_ID, INTEL_DSM_FN_PLATFORM_MUX_INFO,
	81	NULL, ACPI_TYPE_PACKAGE);
	82	if (!pkg) {
	83	DRM_DEBUG_DRIVER("failed to evaluate _DSM\n");
	84	return;
723bfd70 JB	85	}
723bfd70 JB	86
d5c3d79e JL	87	connector_count = &pkg->package.elements[0];
	88	DRM_DEBUG_DRIVER("MUX info connectors: %lld\n",
	89	(unsigned long long)connector_count->integer.value);
	90	for (i = 1; i < pkg->package.count; i++) {
	91	union acpi_object *obj = &pkg->package.elements[i];
	92	union acpi_object *connector_id = &obj->package.elements[0];
	93	union acpi_object *info = &obj->package.elements[1];
	94	DRM_DEBUG_DRIVER("Connector id: 0x%016llx\n",
	95	(unsigned long long)connector_id->integer.value);
	96	DRM_DEBUG_DRIVER(" port id: %s\n",
	97	intel_dsm_port_name(info->buffer.pointer[0]));
	98	DRM_DEBUG_DRIVER(" display mux info: %s\n",
	99	intel_dsm_mux_type(info->buffer.pointer[1]));
	100	DRM_DEBUG_DRIVER(" aux/dc mux info: %s\n",
	101	intel_dsm_mux_type(info->buffer.pointer[2]));
	102	DRM_DEBUG_DRIVER(" hpd mux info: %s\n",
	103	intel_dsm_mux_type(info->buffer.pointer[3]));
723bfd70 JB	104	}
723bfd70 JB	105
d5c3d79e	106	ACPI_FREE(pkg);
723bfd70 JB	107	}
723bfd70 JB	108
723bfd70 JB	109	static bool intel_dsm_pci_probe(struct pci_dev *pdev)
723bfd70 JB	110	{
2a3ca142	111	acpi_handle dhandle;
723bfd70	112
3a83f992	113	dhandle = ACPI_HANDLE(&pdev->dev);
723bfd70 JB	114	if (!dhandle)
	115	return false;
	116
94116f81	117	if (!acpi_check_dsm(dhandle, &intel_dsm_guid, INTEL_DSM_REVISION_ID,
d5c3d79e	118	1 << INTEL_DSM_FN_PLATFORM_MUX_INFO)) {
723bfd70 JB	119	DRM_DEBUG_KMS("no _DSM method for intel device\n");
	120	return false;
	121	}
	122
723bfd70	123	intel_dsm_priv.dhandle = dhandle;
723bfd70	124	intel_dsm_platform_mux_info();
d5c3d79e	125
723bfd70 JB	126	return true;
	127	}
	128
	129	static bool intel_dsm_detect(void)
	130	{
	131	char acpi_method_name[255] = { 0 };
	132	struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};
	133	struct pci_dev *pdev = NULL;
	134	bool has_dsm = false;
	135	int vga_count = 0;
	136
	137	while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
	138	vga_count++;
	139	has_dsm \|= intel_dsm_pci_probe(pdev);
	140	}
	141
	142	if (vga_count == 2 && has_dsm) {
	143	acpi_get_name(intel_dsm_priv.dhandle, ACPI_FULL_PATHNAME, &buffer);
5389e916	144	DRM_DEBUG_DRIVER("vga_switcheroo: detected DSM switching method %s handle\n",
723bfd70 JB	145	acpi_method_name);
	146	return true;
	147	}
	148
	149	return false;
	150	}
	151
	152	void intel_register_dsm_handler(void)
	153	{
	154	if (!intel_dsm_detect())
	155	return;
723bfd70 JB	156	}
	157
	158	void intel_unregister_dsm_handler(void)
	159	{
723bfd70	160	}