From: Luca Coelho <luciano.coelho@xxxxxxxxx>
Dynamic SAR allows changing TX power limits at runtime to comply with
SAR regulations on multiple form factors (e.g. tablet vs. clamshell
mode). To support this, a new table was added to ACPI, which is
called Extended Wireless Regulatory Descriptor (EWRD). This table
allows OEMs to define different TX power profiles for each form-factor
or usage mode.
Read this new table and store it in our SAR profiles table, in
preparation for Dynamic SAR support.
Signed-off-by: Luca Coelho <luciano.coelho@xxxxxxxxx>
---
drivers/net/wireless/intel/iwlwifi/mvm/fw.c | 91 ++++++++++++++++++++++++++--
drivers/net/wireless/intel/iwlwifi/mvm/mvm.h | 2 +-
2 files changed, 88 insertions(+), 5 deletions(-)
diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/fw.c b/drivers/net/wireless/intel/iwlwifi/mvm/fw.c
index df9a721c58c2..50786e90a932 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/fw.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/fw.c
@@ -992,8 +992,11 @@ static int iwl_mvm_config_ltr(struct iwl_mvm *mvm)
#ifdef CONFIG_ACPI
#define ACPI_WRDS_METHOD "WRDS"
-#define ACPI_WRDS_WIFI (0x07)
+#define ACPI_EWRD_METHOD "EWRD"
+#define ACPI_WIFI_DOMAIN (0x07)
#define ACPI_WRDS_WIFI_DATA_SIZE (IWL_MVM_SAR_TABLE_SIZE + 2)
+#define ACPI_EWRD_WIFI_DATA_SIZE ((IWL_MVM_SAR_PROFILE_NUM - 1) * \
+ IWL_MVM_SAR_TABLE_SIZE + 3)
static int iwl_mvm_sar_set_profile(struct iwl_mvm *mvm,
union acpi_object *table,
@@ -1051,7 +1054,7 @@ static union acpi_object *iwl_mvm_sar_find_wifi_pkg(struct iwl_mvm *mvm,
domain = &wifi_pkg->package.elements[0];
if (domain->type == ACPI_TYPE_INTEGER &&
- domain->integer.value == ACPI_WRDS_WIFI)
+ domain->integer.value == ACPI_WIFI_DOMAIN)
break;
wifi_pkg = NULL;
@@ -1120,11 +1123,84 @@ static int iwl_mvm_sar_get_wrds_table(struct iwl_mvm *mvm)
kfree(wrds.pointer);
return ret;
}
+
+static int iwl_mvm_sar_get_ewrd_table(struct iwl_mvm *mvm)
+{
+ union acpi_object *wifi_pkg;
+ acpi_handle root_handle;
+ acpi_handle handle;
+ struct acpi_buffer ewrd = {ACPI_ALLOCATE_BUFFER, NULL};
+ acpi_status status;
+ bool enabled;
+ int i, n_profiles, ret;
+
+ root_handle = ACPI_HANDLE(mvm->dev);
+ if (!root_handle) {
+ IWL_DEBUG_RADIO(mvm,
+ "Could not retrieve root port ACPI handle\n");
+ return -ENOENT;
+ }
+
+ /* Get the method's handle */
+ status = acpi_get_handle(root_handle, (acpi_string)ACPI_EWRD_METHOD,
+ &handle);
+ if (ACPI_FAILURE(status)) {
+ IWL_DEBUG_RADIO(mvm, "EWRD method not found\n");
+ return -ENOENT;
+ }
+
+ /* Call EWRD with no arguments */
+ status = acpi_evaluate_object(handle, NULL, NULL, &ewrd);
+ if (ACPI_FAILURE(status)) {
+ IWL_DEBUG_RADIO(mvm, "EWRD invocation failed (0x%x)\n", status);
+ return -ENOENT;
+ }
+
+ wifi_pkg = iwl_mvm_sar_find_wifi_pkg(mvm, ewrd.pointer,
+ ACPI_EWRD_WIFI_DATA_SIZE);
+ if (IS_ERR(wifi_pkg)) {
+ ret = PTR_ERR(wifi_pkg);
+ goto out_free;
+ }
+
+ if ((wifi_pkg->package.elements[1].type != ACPI_TYPE_INTEGER) ||
+ (wifi_pkg->package.elements[2].type != ACPI_TYPE_INTEGER)) {
+ ret = -EINVAL;
+ goto out_free;
+ }
+
+ enabled = !!(wifi_pkg->package.elements[1].integer.value);
+ n_profiles = wifi_pkg->package.elements[2].integer.value;
+
+ for (i = 0; i < n_profiles; i++) {
+ /* the tables start at element 3 */
+ static int pos = 3;
+
+ ret = iwl_mvm_sar_set_profile(mvm,
+ &wifi_pkg->package.elements[pos],
+ &mvm->sar_profiles[i + 1],
+ enabled);
+ if (ret < 0)
+ break;
+
+ /* go to the next table */
+ pos += IWL_MVM_SAR_TABLE_SIZE;
+ }
+
+out_free:
+ kfree(ewrd.pointer);
+ return ret;
+}
#else /* CONFIG_ACPI */
static int iwl_mvm_sar_get_wrds_table(struct iwl_mvm *mvm)
{
return -ENOENT;
}
+
+static int iwl_mvm_sar_get_ewrd_table(struct iwl_mvm *mvm)
+{
+ return -ENOENT;
+}
#endif /* CONFIG_ACPI */
static int
@@ -1182,12 +1258,19 @@ static int iwl_mvm_sar_init(struct iwl_mvm *mvm)
ret = iwl_mvm_sar_get_wrds_table(mvm);
if (ret < 0) {
IWL_DEBUG_RADIO(mvm,
- "SAR BIOS table invalid or unavailable. (%d)\n",
+ "WRDS SAR BIOS table invalid or unavailable. (%d)\n",
ret);
- /* we don't fail if the table is not available */
+ /* if not available, don't fail and don't bother with EWRD */
return 0;
}
+ ret = iwl_mvm_sar_get_ewrd_table(mvm);
+ /* if EWRD is not available, we can still use WRDS, so don't fail */
+ if (ret < 0)
+ IWL_DEBUG_RADIO(mvm,
+ "EWRD SAR BIOS table invalid or unavailable. (%d)\n",
+ ret);
+
/* choose profile 0 as default for both chains */
ret = iwl_mvm_sar_select_profile(mvm, 0, 0);
diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/mvm.h b/drivers/net/wireless/intel/iwlwifi/mvm/mvm.h
index 0c35d9ebd4ac..a5bdc969717d 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/mvm.h
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/mvm.h
@@ -712,7 +712,7 @@ enum iwl_mvm_queue_status {
#ifdef CONFIG_ACPI
#define IWL_MVM_SAR_TABLE_SIZE 10
-#define IWL_MVM_SAR_PROFILE_NUM 1
+#define IWL_MVM_SAR_PROFILE_NUM 4
struct iwl_mvm_sar_profile {
bool enabled;
--
2.11.0
