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515 lines
14 KiB
515 lines
14 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Architecture-specific ACPI-based support for suspend-to-idle. |
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* |
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* Author: Rafael J. Wysocki <[email protected]> |
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* Author: Srinivas Pandruvada <[email protected]> |
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* Author: Shyam Sundar S K <[email protected]> |
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* |
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* On platforms supporting the Low Power S0 Idle interface there is an ACPI |
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* device object with the PNP0D80 compatible device ID (System Power Management |
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* Controller) and a specific _DSM method under it. That method, if present, |
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* can be used to indicate to the platform that the OS is transitioning into a |
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* low-power state in which certain types of activity are not desirable or that |
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* it is leaving such a state, which allows the platform to adjust its operation |
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* mode accordingly. |
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*/ |
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|
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#include <linux/acpi.h> |
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#include <linux/device.h> |
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#include <linux/suspend.h> |
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#include "../sleep.h" |
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#ifdef CONFIG_SUSPEND |
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static bool sleep_no_lps0 __read_mostly; |
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module_param(sleep_no_lps0, bool, 0644); |
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MODULE_PARM_DESC(sleep_no_lps0, "Do not use the special LPS0 device interface"); |
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static const struct acpi_device_id lps0_device_ids[] = { |
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{"PNP0D80", }, |
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{"", }, |
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}; |
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/* Microsoft platform agnostic UUID */ |
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#define ACPI_LPS0_DSM_UUID_MICROSOFT "11e00d56-ce64-47ce-837b-1f898f9aa461" |
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#define ACPI_LPS0_DSM_UUID "c4eb40a0-6cd2-11e2-bcfd-0800200c9a66" |
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#define ACPI_LPS0_GET_DEVICE_CONSTRAINTS 1 |
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#define ACPI_LPS0_SCREEN_OFF 3 |
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#define ACPI_LPS0_SCREEN_ON 4 |
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#define ACPI_LPS0_ENTRY 5 |
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#define ACPI_LPS0_EXIT 6 |
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#define ACPI_LPS0_MS_ENTRY 7 |
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#define ACPI_LPS0_MS_EXIT 8 |
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/* AMD */ |
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#define ACPI_LPS0_DSM_UUID_AMD "e3f32452-febc-43ce-9039-932122d37721" |
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#define ACPI_LPS0_ENTRY_AMD 2 |
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#define ACPI_LPS0_EXIT_AMD 3 |
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#define ACPI_LPS0_SCREEN_OFF_AMD 4 |
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#define ACPI_LPS0_SCREEN_ON_AMD 5 |
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static acpi_handle lps0_device_handle; |
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static guid_t lps0_dsm_guid; |
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static int lps0_dsm_func_mask; |
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static guid_t lps0_dsm_guid_microsoft; |
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static int lps0_dsm_func_mask_microsoft; |
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/* Device constraint entry structure */ |
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struct lpi_device_info { |
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char *name; |
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int enabled; |
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union acpi_object *package; |
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}; |
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/* Constraint package structure */ |
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struct lpi_device_constraint { |
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int uid; |
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int min_dstate; |
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int function_states; |
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}; |
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struct lpi_constraints { |
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acpi_handle handle; |
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int min_dstate; |
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}; |
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/* AMD Constraint package structure */ |
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struct lpi_device_constraint_amd { |
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char *name; |
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int enabled; |
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int function_states; |
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int min_dstate; |
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}; |
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static struct lpi_constraints *lpi_constraints_table; |
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static int lpi_constraints_table_size; |
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static int rev_id; |
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static void lpi_device_get_constraints_amd(void) |
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{ |
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union acpi_object *out_obj; |
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int i, j, k; |
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out_obj = acpi_evaluate_dsm_typed(lps0_device_handle, &lps0_dsm_guid, |
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rev_id, ACPI_LPS0_GET_DEVICE_CONSTRAINTS, |
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NULL, ACPI_TYPE_PACKAGE); |
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acpi_handle_debug(lps0_device_handle, "_DSM function 1 eval %s\n", |
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out_obj ? "successful" : "failed"); |
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if (!out_obj) |
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return; |
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for (i = 0; i < out_obj->package.count; i++) { |
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union acpi_object *package = &out_obj->package.elements[i]; |
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if (package->type == ACPI_TYPE_PACKAGE) { |
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lpi_constraints_table = kcalloc(package->package.count, |
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sizeof(*lpi_constraints_table), |
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GFP_KERNEL); |
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if (!lpi_constraints_table) |
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goto free_acpi_buffer; |
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acpi_handle_debug(lps0_device_handle, |
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"LPI: constraints list begin:\n"); |
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for (j = 0; j < package->package.count; ++j) { |
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union acpi_object *info_obj = &package->package.elements[j]; |
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struct lpi_device_constraint_amd dev_info = {}; |
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struct lpi_constraints *list; |
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acpi_status status; |
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for (k = 0; k < info_obj->package.count; ++k) { |
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union acpi_object *obj = &info_obj->package.elements[k]; |
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list = &lpi_constraints_table[lpi_constraints_table_size]; |
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list->min_dstate = -1; |
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switch (k) { |
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case 0: |
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dev_info.enabled = obj->integer.value; |
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break; |
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case 1: |
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dev_info.name = obj->string.pointer; |
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break; |
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case 2: |
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dev_info.function_states = obj->integer.value; |
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break; |
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case 3: |
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dev_info.min_dstate = obj->integer.value; |
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break; |
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} |
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if (!dev_info.enabled || !dev_info.name || |
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!dev_info.min_dstate) |
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continue; |
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status = acpi_get_handle(NULL, dev_info.name, |
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&list->handle); |
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if (ACPI_FAILURE(status)) |
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continue; |
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acpi_handle_debug(lps0_device_handle, |
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"Name:%s\n", dev_info.name); |
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list->min_dstate = dev_info.min_dstate; |
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if (list->min_dstate < 0) { |
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acpi_handle_debug(lps0_device_handle, |
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"Incomplete constraint defined\n"); |
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continue; |
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} |
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} |
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lpi_constraints_table_size++; |
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} |
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} |
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} |
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acpi_handle_debug(lps0_device_handle, "LPI: constraints list end\n"); |
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free_acpi_buffer: |
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ACPI_FREE(out_obj); |
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} |
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static void lpi_device_get_constraints(void) |
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{ |
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union acpi_object *out_obj; |
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int i; |
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out_obj = acpi_evaluate_dsm_typed(lps0_device_handle, &lps0_dsm_guid, |
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1, ACPI_LPS0_GET_DEVICE_CONSTRAINTS, |
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NULL, ACPI_TYPE_PACKAGE); |
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acpi_handle_debug(lps0_device_handle, "_DSM function 1 eval %s\n", |
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out_obj ? "successful" : "failed"); |
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if (!out_obj) |
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return; |
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lpi_constraints_table = kcalloc(out_obj->package.count, |
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sizeof(*lpi_constraints_table), |
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GFP_KERNEL); |
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if (!lpi_constraints_table) |
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goto free_acpi_buffer; |
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acpi_handle_debug(lps0_device_handle, "LPI: constraints list begin:\n"); |
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for (i = 0; i < out_obj->package.count; i++) { |
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struct lpi_constraints *constraint; |
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acpi_status status; |
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union acpi_object *package = &out_obj->package.elements[i]; |
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struct lpi_device_info info = { }; |
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int package_count = 0, j; |
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if (!package) |
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continue; |
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for (j = 0; j < package->package.count; ++j) { |
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union acpi_object *element = |
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&(package->package.elements[j]); |
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switch (element->type) { |
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case ACPI_TYPE_INTEGER: |
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info.enabled = element->integer.value; |
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break; |
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case ACPI_TYPE_STRING: |
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info.name = element->string.pointer; |
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break; |
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case ACPI_TYPE_PACKAGE: |
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package_count = element->package.count; |
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info.package = element->package.elements; |
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break; |
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} |
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} |
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if (!info.enabled || !info.package || !info.name) |
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continue; |
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constraint = &lpi_constraints_table[lpi_constraints_table_size]; |
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status = acpi_get_handle(NULL, info.name, &constraint->handle); |
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if (ACPI_FAILURE(status)) |
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continue; |
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acpi_handle_debug(lps0_device_handle, |
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"index:%d Name:%s\n", i, info.name); |
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constraint->min_dstate = -1; |
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for (j = 0; j < package_count; ++j) { |
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union acpi_object *info_obj = &info.package[j]; |
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union acpi_object *cnstr_pkg; |
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union acpi_object *obj; |
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struct lpi_device_constraint dev_info; |
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switch (info_obj->type) { |
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case ACPI_TYPE_INTEGER: |
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/* version */ |
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break; |
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case ACPI_TYPE_PACKAGE: |
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if (info_obj->package.count < 2) |
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break; |
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cnstr_pkg = info_obj->package.elements; |
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obj = &cnstr_pkg[0]; |
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dev_info.uid = obj->integer.value; |
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obj = &cnstr_pkg[1]; |
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dev_info.min_dstate = obj->integer.value; |
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acpi_handle_debug(lps0_device_handle, |
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"uid:%d min_dstate:%s\n", |
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dev_info.uid, |
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acpi_power_state_string(dev_info.min_dstate)); |
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constraint->min_dstate = dev_info.min_dstate; |
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break; |
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} |
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} |
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if (constraint->min_dstate < 0) { |
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acpi_handle_debug(lps0_device_handle, |
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"Incomplete constraint defined\n"); |
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continue; |
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} |
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lpi_constraints_table_size++; |
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} |
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acpi_handle_debug(lps0_device_handle, "LPI: constraints list end\n"); |
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free_acpi_buffer: |
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ACPI_FREE(out_obj); |
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} |
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static void lpi_check_constraints(void) |
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{ |
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int i; |
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for (i = 0; i < lpi_constraints_table_size; ++i) { |
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acpi_handle handle = lpi_constraints_table[i].handle; |
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struct acpi_device *adev; |
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if (!handle || acpi_bus_get_device(handle, &adev)) |
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continue; |
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acpi_handle_debug(handle, |
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"LPI: required min power state:%s current power state:%s\n", |
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acpi_power_state_string(lpi_constraints_table[i].min_dstate), |
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acpi_power_state_string(adev->power.state)); |
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if (!adev->flags.power_manageable) { |
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acpi_handle_info(handle, "LPI: Device not power manageable\n"); |
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lpi_constraints_table[i].handle = NULL; |
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continue; |
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} |
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if (adev->power.state < lpi_constraints_table[i].min_dstate) |
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acpi_handle_info(handle, |
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"LPI: Constraint not met; min power state:%s current power state:%s\n", |
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acpi_power_state_string(lpi_constraints_table[i].min_dstate), |
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acpi_power_state_string(adev->power.state)); |
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} |
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} |
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static void acpi_sleep_run_lps0_dsm(unsigned int func, unsigned int func_mask, guid_t dsm_guid) |
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{ |
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union acpi_object *out_obj; |
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if (!(func_mask & (1 << func))) |
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return; |
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out_obj = acpi_evaluate_dsm(lps0_device_handle, &dsm_guid, |
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rev_id, func, NULL); |
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ACPI_FREE(out_obj); |
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acpi_handle_debug(lps0_device_handle, "_DSM function %u evaluation %s\n", |
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func, out_obj ? "successful" : "failed"); |
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} |
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static bool acpi_s2idle_vendor_amd(void) |
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{ |
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return boot_cpu_data.x86_vendor == X86_VENDOR_AMD; |
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} |
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static int validate_dsm(acpi_handle handle, const char *uuid, int rev, guid_t *dsm_guid) |
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{ |
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union acpi_object *obj; |
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int ret = -EINVAL; |
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guid_parse(uuid, dsm_guid); |
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obj = acpi_evaluate_dsm(handle, dsm_guid, rev, 0, NULL); |
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/* Check if the _DSM is present and as expected. */ |
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if (!obj || obj->type != ACPI_TYPE_BUFFER || obj->buffer.length == 0 || |
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obj->buffer.length > sizeof(u32)) { |
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acpi_handle_debug(handle, |
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"_DSM UUID %s rev %d function 0 evaluation failed\n", uuid, rev); |
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goto out; |
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} |
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ret = *(int *)obj->buffer.pointer; |
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acpi_handle_debug(handle, "_DSM UUID %s rev %d function mask: 0x%x\n", uuid, rev, ret); |
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out: |
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ACPI_FREE(obj); |
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return ret; |
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} |
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static int lps0_device_attach(struct acpi_device *adev, |
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const struct acpi_device_id *not_used) |
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{ |
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if (lps0_device_handle) |
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return 0; |
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if (!(acpi_gbl_FADT.flags & ACPI_FADT_LOW_POWER_S0)) |
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return 0; |
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if (acpi_s2idle_vendor_amd()) { |
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/* AMD0004, AMDI0005: |
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* - Should use rev_id 0x0 |
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* - function mask > 0x3: Should use AMD method, but has off by one bug |
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* - function mask = 0x3: Should use Microsoft method |
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* AMDI0006: |
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* - should use rev_id 0x0 |
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* - function mask = 0x3: Should use Microsoft method |
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* AMDI0007: |
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* - Should use rev_id 0x2 |
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* - Should only use AMD method |
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*/ |
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const char *hid = acpi_device_hid(adev); |
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rev_id = strcmp(hid, "AMDI0007") ? 0 : 2; |
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lps0_dsm_func_mask = validate_dsm(adev->handle, |
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ACPI_LPS0_DSM_UUID_AMD, rev_id, &lps0_dsm_guid); |
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lps0_dsm_func_mask_microsoft = validate_dsm(adev->handle, |
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ACPI_LPS0_DSM_UUID_MICROSOFT, 0, |
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&lps0_dsm_guid_microsoft); |
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if (lps0_dsm_func_mask > 0x3 && (!strcmp(hid, "AMD0004") || |
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!strcmp(hid, "AMDI0005"))) { |
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lps0_dsm_func_mask = (lps0_dsm_func_mask << 1) | 0x1; |
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acpi_handle_debug(adev->handle, "_DSM UUID %s: Adjusted function mask: 0x%x\n", |
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ACPI_LPS0_DSM_UUID_AMD, lps0_dsm_func_mask); |
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} else if (lps0_dsm_func_mask_microsoft > 0 && !strcmp(hid, "AMDI0007")) { |
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lps0_dsm_func_mask_microsoft = -EINVAL; |
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acpi_handle_debug(adev->handle, "_DSM Using AMD method\n"); |
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} |
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} else { |
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rev_id = 1; |
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lps0_dsm_func_mask = validate_dsm(adev->handle, |
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ACPI_LPS0_DSM_UUID, rev_id, &lps0_dsm_guid); |
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lps0_dsm_func_mask_microsoft = -EINVAL; |
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} |
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if (lps0_dsm_func_mask < 0 && lps0_dsm_func_mask_microsoft < 0) |
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return 0; //function evaluation failed |
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lps0_device_handle = adev->handle; |
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if (acpi_s2idle_vendor_amd()) |
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lpi_device_get_constraints_amd(); |
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else |
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lpi_device_get_constraints(); |
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/* |
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* Use suspend-to-idle by default if the default suspend mode was not |
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* set from the command line. |
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*/ |
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if (mem_sleep_default > PM_SUSPEND_MEM && !acpi_sleep_default_s3) |
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mem_sleep_current = PM_SUSPEND_TO_IDLE; |
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/* |
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* Some Intel based LPS0 systems, like ASUS Zenbook UX430UNR/i7-8550U don't |
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* use intel-hid or intel-vbtn but require the EC GPE to be enabled while |
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* suspended for certain wakeup devices to work, so mark it as wakeup-capable. |
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* |
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* Only enable on !AMD as enabling this universally causes problems for a number |
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* of AMD based systems. |
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*/ |
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if (!acpi_s2idle_vendor_amd()) |
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acpi_ec_mark_gpe_for_wake(); |
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return 0; |
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} |
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static struct acpi_scan_handler lps0_handler = { |
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.ids = lps0_device_ids, |
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.attach = lps0_device_attach, |
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}; |
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int acpi_s2idle_prepare_late(void) |
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{ |
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if (!lps0_device_handle || sleep_no_lps0) |
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return 0; |
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if (pm_debug_messages_on) |
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lpi_check_constraints(); |
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if (lps0_dsm_func_mask_microsoft > 0) { |
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acpi_sleep_run_lps0_dsm(ACPI_LPS0_SCREEN_OFF, |
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lps0_dsm_func_mask_microsoft, lps0_dsm_guid_microsoft); |
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acpi_sleep_run_lps0_dsm(ACPI_LPS0_MS_EXIT, |
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lps0_dsm_func_mask_microsoft, lps0_dsm_guid_microsoft); |
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acpi_sleep_run_lps0_dsm(ACPI_LPS0_ENTRY, |
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lps0_dsm_func_mask_microsoft, lps0_dsm_guid_microsoft); |
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} else if (acpi_s2idle_vendor_amd()) { |
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acpi_sleep_run_lps0_dsm(ACPI_LPS0_SCREEN_OFF_AMD, |
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lps0_dsm_func_mask, lps0_dsm_guid); |
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acpi_sleep_run_lps0_dsm(ACPI_LPS0_ENTRY_AMD, |
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lps0_dsm_func_mask, lps0_dsm_guid); |
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} else { |
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acpi_sleep_run_lps0_dsm(ACPI_LPS0_SCREEN_OFF, |
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lps0_dsm_func_mask, lps0_dsm_guid); |
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acpi_sleep_run_lps0_dsm(ACPI_LPS0_ENTRY, |
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lps0_dsm_func_mask, lps0_dsm_guid); |
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} |
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|
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return 0; |
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} |
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void acpi_s2idle_restore_early(void) |
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{ |
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if (!lps0_device_handle || sleep_no_lps0) |
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return; |
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|
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if (lps0_dsm_func_mask_microsoft > 0) { |
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acpi_sleep_run_lps0_dsm(ACPI_LPS0_EXIT, |
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lps0_dsm_func_mask_microsoft, lps0_dsm_guid_microsoft); |
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acpi_sleep_run_lps0_dsm(ACPI_LPS0_MS_ENTRY, |
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lps0_dsm_func_mask_microsoft, lps0_dsm_guid_microsoft); |
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acpi_sleep_run_lps0_dsm(ACPI_LPS0_SCREEN_ON, |
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lps0_dsm_func_mask_microsoft, lps0_dsm_guid_microsoft); |
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} else if (acpi_s2idle_vendor_amd()) { |
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acpi_sleep_run_lps0_dsm(ACPI_LPS0_EXIT_AMD, |
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lps0_dsm_func_mask, lps0_dsm_guid); |
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acpi_sleep_run_lps0_dsm(ACPI_LPS0_SCREEN_ON_AMD, |
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lps0_dsm_func_mask, lps0_dsm_guid); |
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} else { |
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acpi_sleep_run_lps0_dsm(ACPI_LPS0_EXIT, |
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lps0_dsm_func_mask, lps0_dsm_guid); |
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acpi_sleep_run_lps0_dsm(ACPI_LPS0_SCREEN_ON, |
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lps0_dsm_func_mask, lps0_dsm_guid); |
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} |
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} |
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|
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static const struct platform_s2idle_ops acpi_s2idle_ops_lps0 = { |
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.begin = acpi_s2idle_begin, |
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.prepare = acpi_s2idle_prepare, |
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.prepare_late = acpi_s2idle_prepare_late, |
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.wake = acpi_s2idle_wake, |
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.restore_early = acpi_s2idle_restore_early, |
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.restore = acpi_s2idle_restore, |
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.end = acpi_s2idle_end, |
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}; |
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|
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void acpi_s2idle_setup(void) |
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{ |
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acpi_scan_add_handler(&lps0_handler); |
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s2idle_set_ops(&acpi_s2idle_ops_lps0); |
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} |
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#endif /* CONFIG_SUSPEND */
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