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>
11  * Controller) and a specific _DSM method under it.  That method, if present,
13  * low-power state in which certain types of activity are not desirable or that
36 #define ACPI_LPS0_DSM_UUID_MICROSOFT      "11e00d56-ce64-47ce-837b-1f898f9aa461"
38 #define ACPI_LPS0_DSM_UUID	"c4eb40a0-6cd2-11e2-bcfd-0800200c9a66"
49 #define ACPI_LPS0_DSM_UUID_AMD      "e3f32452-febc-43ce-9039-932122d37721"
62 /* Device constraint entry structure */
108 	for (i = 0; i < out_obj->package.count; i++) {  in lpi_device_get_constraints_amd()
109 		union acpi_object *package = &out_obj->package.elements[i];  in lpi_device_get_constraints_amd()
111 		if (package->type == ACPI_TYPE_PACKAGE) {  in lpi_device_get_constraints_amd()
112 			lpi_constraints_table = kcalloc(package->package.count,  in lpi_device_get_constraints_amd()
122 			for (j = 0; j < package->package.count; ++j) {  in lpi_device_get_constraints_amd()
123 				union acpi_object *info_obj = &package->package.elements[j];  in lpi_device_get_constraints_amd()
128 				for (k = 0; k < info_obj->package.count; ++k) {  in lpi_device_get_constraints_amd()
129 					union acpi_object *obj = &info_obj->package.elements[k];  in lpi_device_get_constraints_amd()
132 					list->min_dstate = -1;  in lpi_device_get_constraints_amd()
136 						dev_info.enabled = obj->integer.value;  in lpi_device_get_constraints_amd()
139 						dev_info.name = obj->string.pointer;  in lpi_device_get_constraints_amd()
142 						dev_info.function_states = obj->integer.value;  in lpi_device_get_constraints_amd()
145 						dev_info.min_dstate = obj->integer.value;  in lpi_device_get_constraints_amd()
154 								 &list->handle);  in lpi_device_get_constraints_amd()
161 					list->min_dstate = dev_info.min_dstate;  in lpi_device_get_constraints_amd()
163 					if (list->min_dstate < 0) {  in lpi_device_get_constraints_amd()
195 	lpi_constraints_table = kcalloc(out_obj->package.count,  in lpi_device_get_constraints()
203 	for (i = 0; i < out_obj->package.count; i++) {  in lpi_device_get_constraints()
206 		union acpi_object *package = &out_obj->package.elements[i];  in lpi_device_get_constraints()
213 		for (j = 0; j < package->package.count; ++j) {  in lpi_device_get_constraints()
215 					&(package->package.elements[j]);  in lpi_device_get_constraints()
217 			switch (element->type) {  in lpi_device_get_constraints()
219 				info.enabled = element->integer.value;  in lpi_device_get_constraints()
222 				info.name = element->string.pointer;  in lpi_device_get_constraints()
225 				package_count = element->package.count;  in lpi_device_get_constraints()
226 				info.package = element->package.elements;  in lpi_device_get_constraints()
236 		status = acpi_get_handle(NULL, info.name, &constraint->handle);  in lpi_device_get_constraints()
243 		constraint->min_dstate = -1;  in lpi_device_get_constraints()
251 			switch (info_obj->type) {  in lpi_device_get_constraints()
256 				if (info_obj->package.count < 2)  in lpi_device_get_constraints()
259 				cnstr_pkg = info_obj->package.elements;  in lpi_device_get_constraints()
261 				dev_info.uid = obj->integer.value;  in lpi_device_get_constraints()
263 				dev_info.min_dstate = obj->integer.value;  in lpi_device_get_constraints()
270 				constraint->min_dstate = dev_info.min_dstate;  in lpi_device_get_constraints()
275 		if (constraint->min_dstate < 0) {  in lpi_device_get_constraints()
304 			acpi_power_state_string(adev->power.state));  in lpi_check_constraints()
306 		if (!adev->flags.power_manageable) {  in lpi_check_constraints()
312 		if (adev->power.state < lpi_constraints_table[i].min_dstate)  in lpi_check_constraints()
316 				acpi_power_state_string(adev->power.state));  in lpi_check_constraints()
343 	int ret = -EINVAL;  in validate_dsm()
349 	if (!obj || obj->type != ACPI_TYPE_BUFFER || obj->buffer.length == 0 ||  in validate_dsm()
350 	    obj->buffer.length > sizeof(u32)) {  in validate_dsm()
356 	ret = *(int *)obj->buffer.pointer;  in validate_dsm()
375 		 * - Should use rev_id 0x0  in lps0_device_attach()
376 		 * - function mask > 0x3: Should use AMD method, but has off by one bug  in lps0_device_attach()
377 		 * - function mask = 0x3: Should use Microsoft method  in lps0_device_attach()
379 		 * - should use rev_id 0x0  in lps0_device_attach()
380 		 * - function mask = 0x3: Should use Microsoft method  in lps0_device_attach()
382 		 * - Should use rev_id 0x2  in lps0_device_attach()
383 		 * - Should only use AMD method  in lps0_device_attach()
387 		lps0_dsm_func_mask = validate_dsm(adev->handle,  in lps0_device_attach()
389 		lps0_dsm_func_mask_microsoft = validate_dsm(adev->handle,  in lps0_device_attach()
396 			acpi_handle_debug(adev->handle, "_DSM UUID %s: Adjusted function mask: 0x%x\n",  in lps0_device_attach()
399 			lps0_dsm_func_mask_microsoft = -EINVAL;  in lps0_device_attach()
400 			acpi_handle_debug(adev->handle, "_DSM Using AMD method\n");  in lps0_device_attach()
404 		lps0_dsm_func_mask = validate_dsm(adev->handle,  in lps0_device_attach()
406 		lps0_dsm_func_mask_microsoft = -EINVAL;  in lps0_device_attach()
412 	lps0_device_handle = adev->handle;  in lps0_device_attach()
420 	 * Use suspend-to-idle by default if the default suspend mode was not  in lps0_device_attach()
427 	 * Some Intel based LPS0 systems, like ASUS Zenbook UX430UNR/i7-8550U don't  in lps0_device_attach()
428 	 * use intel-hid or intel-vbtn but require the EC GPE to be enabled while  in lps0_device_attach()
429 	 * suspended for certain wakeup devices to work, so mark it as wakeup-capable.  in lps0_device_attach()
464 	/* LPS0 entry */  in acpi_s2idle_prepare_late()
473 		/* modern standby entry */  in acpi_s2idle_prepare_late()