1 // SPDX-License-Identifier: GPL-2.0
3  * Architecture-specific ACPI-based support for suspend-to-idle.
7  * Author: Shyam Sundar S K <Shyam-sundar.S-k@amd.com>
13  * low-power state in which certain types of activity are not desirable or that
15  * mode accordingly.
37 #define ACPI_LPS0_DSM_UUID_MICROSOFT      "11e00d56-ce64-47ce-837b-1f898f9aa461"
39 #define ACPI_LPS0_DSM_UUID	"c4eb40a0-6cd2-11e2-bcfd-0800200c9a66"
50 #define ACPI_LPS0_DSM_UUID_AMD      "e3f32452-febc-43ce-9039-932122d37721"
68 	union acpi_object *package;  member
71 /* Constraint package structure */
83 /* AMD Constraint package structure */
117 	for (i = 0; i < out_obj->package.count; i++) {  in lpi_device_get_constraints_amd()
118 		union acpi_object *package = &out_obj->package.elements[i];  in lpi_device_get_constraints_amd()  local
120 		if (package->type == ACPI_TYPE_PACKAGE) {  in lpi_device_get_constraints_amd()
127 			lpi_constraints_table = kcalloc(package->package.count,  in lpi_device_get_constraints_amd()
137 			for (j = 0; j < package->package.count; j++) {  in lpi_device_get_constraints_amd()
138 				union acpi_object *info_obj = &package->package.elements[j];  in lpi_device_get_constraints_amd()
145 				for (k = 0; k < info_obj->package.count; k++) {  in lpi_device_get_constraints_amd()
146 					union acpi_object *obj = &info_obj->package.elements[k];  in lpi_device_get_constraints_amd()
150 						dev_info.enabled = obj->integer.value;  in lpi_device_get_constraints_amd()
153 						dev_info.name = obj->string.pointer;  in lpi_device_get_constraints_amd()
156 						dev_info.function_states = obj->integer.value;  in lpi_device_get_constraints_amd()
159 						dev_info.min_dstate = obj->integer.value;  in lpi_device_get_constraints_amd()
175 				status = acpi_get_handle(NULL, dev_info.name, &list->handle);  in lpi_device_get_constraints_amd()
179 				list->min_dstate = dev_info.min_dstate;  in lpi_device_get_constraints_amd()
207 	lpi_constraints_table = kcalloc(out_obj->package.count,  in lpi_device_get_constraints()
215 	for (i = 0; i < out_obj->package.count; i++) {  in lpi_device_get_constraints()
218 		union acpi_object *package = &out_obj->package.elements[i];  in lpi_device_get_constraints()  local
222 		if (!package)  in lpi_device_get_constraints()
225 		for (j = 0; j < package->package.count; j++) {  in lpi_device_get_constraints()
227 					&(package->package.elements[j]);  in lpi_device_get_constraints()
229 			switch (element->type) {  in lpi_device_get_constraints()
231 				info.enabled = element->integer.value;  in lpi_device_get_constraints()
234 				info.name = element->string.pointer;  in lpi_device_get_constraints()
237 				package_count = element->package.count;  in lpi_device_get_constraints()
238 				info.package = element->package.elements;  in lpi_device_get_constraints()
243 		if (!info.enabled || !info.package || !info.name)  in lpi_device_get_constraints()
248 		status = acpi_get_handle(NULL, info.name, &constraint->handle);  in lpi_device_get_constraints()
255 		constraint->min_dstate = -1;  in lpi_device_get_constraints()
258 			union acpi_object *info_obj = &info.package[j];  in lpi_device_get_constraints()
263 			switch (info_obj->type) {  in lpi_device_get_constraints()
268 				if (info_obj->package.count < 2)  in lpi_device_get_constraints()
271 				cnstr_pkg = info_obj->package.elements;  in lpi_device_get_constraints()
273 				dev_info.uid = obj->integer.value;  in lpi_device_get_constraints()
275 				dev_info.min_dstate = obj->integer.value;  in lpi_device_get_constraints()
282 				constraint->min_dstate = dev_info.min_dstate;  in lpi_device_get_constraints()
287 		if (constraint->min_dstate < 0) {  in lpi_device_get_constraints()
303  * acpi_get_lps0_constraint - Get the LPS0 constraint for a device.
308  * energy conservation by utilizing a system-wide low-power state.
311  *  - ACPI power state value of the constraint for @adev on success.
312  *  - Otherwise, ACPI_STATE_UNKNOWN.
319 		if (adev->handle == entry->handle)  in acpi_get_lps0_constraint()
320 			return entry->min_dstate;  in acpi_get_lps0_constraint()
331 		struct acpi_device *adev = acpi_fetch_acpi_dev(entry->handle);  in lpi_check_constraints()
336 		acpi_handle_debug(entry->handle,  in lpi_check_constraints()
338 			acpi_power_state_string(entry->min_dstate),  in lpi_check_constraints()
339 			acpi_power_state_string(adev->power.state));  in lpi_check_constraints()
341 		if (!adev->flags.power_manageable) {  in lpi_check_constraints()
342 			acpi_handle_info(entry->handle, "LPI: Device not power manageable\n");  in lpi_check_constraints()
343 			entry->handle = NULL;  in lpi_check_constraints()
347 		if (adev->power.state < entry->min_dstate)  in lpi_check_constraints()
348 			acpi_handle_info(entry->handle,  in lpi_check_constraints()
350 				acpi_power_state_string(entry->min_dstate),  in lpi_check_constraints()
351 				acpi_power_state_string(adev->power.state));  in lpi_check_constraints()
417 	int ret = -EINVAL;  in validate_dsm()
423 	if (!obj || obj->buffer.length == 0 || obj->buffer.length > sizeof(u32)) {  in validate_dsm()
429 	ret = *(int *)obj->buffer.pointer;  in validate_dsm()
463 	lps0_dsm_func_mask_microsoft = validate_dsm(adev->handle,  in lps0_device_attach()
470 		for (dev_id = &amd_hid_ids[0]; dev_id->id[0]; dev_id++)  in lps0_device_attach()
471 			if (acpi_dev_hid_uid_match(adev, dev_id->id, NULL))  in lps0_device_attach()
473 		if (dev_id->id[0])  in lps0_device_attach()
474 			data = (const struct amd_lps0_hid_device_data *) dev_id->driver_data;  in lps0_device_attach()
477 		lps0_dsm_func_mask = validate_dsm(adev->handle,  in lps0_device_attach()
479 		if (lps0_dsm_func_mask > 0x3 && data->check_off_by_one) {  in lps0_device_attach()
481 			acpi_handle_debug(adev->handle, "_DSM UUID %s: Adjusted function mask: 0x%x\n",  in lps0_device_attach()
484 			lps0_dsm_func_mask_microsoft = -EINVAL;  in lps0_device_attach()
485 			acpi_handle_debug(adev->handle, "_DSM Using AMD method\n");  in lps0_device_attach()
489 		lps0_dsm_func_mask = validate_dsm(adev->handle,  in lps0_device_attach()
500 				acpi_handle_info(adev->handle,  in lps0_device_attach()
509 	lps0_device_handle = adev->handle;  in lps0_device_attach()
517 	 * Use suspend-to-idle by default if ACPI_FADT_LOW_POWER_S0 is set in  in lps0_device_attach()
518 	 * the FADT and the default suspend mode was not set from the command  in lps0_device_attach()
524 		pr_info("Low-power S0 idle used by default for system suspend\n");  in lps0_device_attach()
528 	 * Some LPS0 systems, like ASUS Zenbook UX430UNR/i7-8550U, require the  in lps0_device_attach()
530 	 * work, so mark it as wakeup-capable.  in lps0_device_attach()
581 		if (handler->prepare)  in acpi_s2idle_prepare_late()
582 			handler->prepare();  in acpi_s2idle_prepare_late()
596 		if (handler->check)  in acpi_s2idle_check()
597 			handler->check();  in acpi_s2idle_check()
609 		if (handler->restore)  in acpi_s2idle_restore_early()
610 			handler->restore();  in acpi_s2idle_restore_early()
660 		return -ENODEV;  in acpi_register_lps0_dev()
663 	list_add(&arg->list_node, &lps0_s2idle_devops_head);  in acpi_register_lps0_dev()
678 	list_del(&arg->list_node);  in acpi_unregister_lps0_dev()