From da2830acf15aab9cb2c376b74463d6d6ecc18716 Mon Sep 17 00:00:00 2001 From: Luca Coelho Date: Mon, 30 May 2016 13:00:44 +0300 Subject: [PATCH] iwlwifi: mvm: read SAR BIOS table from ACPI Read the SAR BIOS table from the ACPI and parse it into the iwl_mvm_sar_table structure. If the table is enabled, send it to the firmware via REDUCE_TX_POWER_CMD. Signed-off-by: Luca Coelho Signed-off-by: Luca Coelho --- drivers/net/wireless/intel/iwlwifi/mvm/fw.c | 173 ++++++++++++++++++++ 1 file changed, 173 insertions(+) diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/fw.c b/drivers/net/wireless/intel/iwlwifi/mvm/fw.c index 510b4c1be35d..4db1d84749ab 100644 --- a/drivers/net/wireless/intel/iwlwifi/mvm/fw.c +++ b/drivers/net/wireless/intel/iwlwifi/mvm/fw.c @@ -65,6 +65,7 @@ *****************************************************************************/ #include #include +#include #include "iwl-trans.h" #include "iwl-op-mode.h" @@ -902,6 +903,174 @@ static int iwl_mvm_config_ltr(struct iwl_mvm *mvm) sizeof(cmd), &cmd); } +#define ACPI_WRDS_METHOD "WRDS" +#define ACPI_WRDS_WIFI (0x07) +#define ACPI_WRDS_TABLE_SIZE 10 + +struct iwl_mvm_sar_table { + bool enabled; + u8 values[ACPI_WRDS_TABLE_SIZE]; +}; + +#ifdef CONFIG_ACPI +static int iwl_mvm_sar_get_wrds(struct iwl_mvm *mvm, union acpi_object *wrds, + struct iwl_mvm_sar_table *sar_table) +{ + union acpi_object *data_pkg; + u32 i; + + /* We need at least two packages, one for the revision and one + * for the data itself. Also check that the revision is valid + * (i.e. it is an integer set to 0). + */ + if (wrds->type != ACPI_TYPE_PACKAGE || + wrds->package.count < 2 || + wrds->package.elements[0].type != ACPI_TYPE_INTEGER || + wrds->package.elements[0].integer.value != 0) { + IWL_DEBUG_RADIO(mvm, "Unsupported wrds structure\n"); + return -EINVAL; + } + + /* loop through all the packages to find the one for WiFi */ + for (i = 1; i < wrds->package.count; i++) { + union acpi_object *domain; + + data_pkg = &wrds->package.elements[i]; + + /* Skip anything that is not a package with the right + * amount of elements (i.e. domain_type, + * enabled/disabled plus the sar table size. + */ + if (data_pkg->type != ACPI_TYPE_PACKAGE || + data_pkg->package.count != ACPI_WRDS_TABLE_SIZE + 2) + continue; + + domain = &data_pkg->package.elements[0]; + if (domain->type == ACPI_TYPE_INTEGER && + domain->integer.value == ACPI_WRDS_WIFI) + break; + + data_pkg = NULL; + } + + if (!data_pkg) + return -ENOENT; + + if (data_pkg->package.elements[1].type != ACPI_TYPE_INTEGER) + return -EINVAL; + + sar_table->enabled = !!(data_pkg->package.elements[1].integer.value); + + for (i = 0; i < ACPI_WRDS_TABLE_SIZE; i++) { + union acpi_object *entry; + + entry = &data_pkg->package.elements[i + 2]; + if ((entry->type != ACPI_TYPE_INTEGER) || + (entry->integer.value > U8_MAX)) + return -EINVAL; + + sar_table->values[i] = entry->integer.value; + } + + return 0; +} + +static int iwl_mvm_sar_get_table(struct iwl_mvm *mvm, + struct iwl_mvm_sar_table *sar_table) +{ + acpi_handle root_handle; + acpi_handle handle; + struct acpi_buffer wrds = {ACPI_ALLOCATE_BUFFER, NULL}; + acpi_status status; + int 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_WRDS_METHOD, + &handle); + if (ACPI_FAILURE(status)) { + IWL_DEBUG_RADIO(mvm, "WRDS method not found\n"); + return -ENOENT; + } + + /* Call WRDS with no arguments */ + status = acpi_evaluate_object(handle, NULL, NULL, &wrds); + if (ACPI_FAILURE(status)) { + IWL_DEBUG_RADIO(mvm, "WRDS invocation failed (0x%x)\n", status); + return -ENOENT; + } + + ret = iwl_mvm_sar_get_wrds(mvm, wrds.pointer, sar_table); + kfree(wrds.pointer); + + return ret; +} +#else /* CONFIG_ACPI */ +static int iwl_mvm_sar_get_table(struct iwl_mvm *mvm, + struct iwl_mvm_sar_table *sar_table) +{ + return -ENOENT; +} +#endif /* CONFIG_ACPI */ + +static int iwl_mvm_sar_init(struct iwl_mvm *mvm) +{ + struct iwl_mvm_sar_table sar_table; + struct iwl_dev_tx_power_cmd cmd = { + .v2.set_mode = cpu_to_le32(IWL_TX_POWER_MODE_SET_CHAINS), + }; + int ret, i, j, idx; + + /* we can't do anything with the table if the FW doesn't support it */ + if (!fw_has_api(&mvm->fw->ucode_capa, + IWL_UCODE_TLV_API_TX_POWER_CHAIN)) { + IWL_DEBUG_RADIO(mvm, + "FW doesn't support per-chain TX power settings.\n"); + return 0; + } + + ret = iwl_mvm_sar_get_table(mvm, &sar_table); + if (ret < 0) { + IWL_DEBUG_RADIO(mvm, + "SAR BIOS table invalid or unavailable. (%d)\n", + ret); + /* we don't fail if the table is not available */ + return 0; + } + + if (!sar_table.enabled) + return 0; + + IWL_DEBUG_RADIO(mvm, "Sending REDUCE_TX_POWER_CMD per chain\n"); + + BUILD_BUG_ON(IWL_NUM_CHAIN_LIMITS * IWL_NUM_SUB_BANDS != + ACPI_WRDS_TABLE_SIZE); + + for (i = 0; i < IWL_NUM_CHAIN_LIMITS; i++) { + IWL_DEBUG_RADIO(mvm, " Chain[%d]:\n", i); + for (j = 0; j < IWL_NUM_SUB_BANDS; j++) { + idx = (i * IWL_NUM_SUB_BANDS) + j; + cmd.per_chain_restriction[i][j] = + cpu_to_le16(sar_table.values[idx]); + IWL_DEBUG_RADIO(mvm, " Band[%d] = %d * .125dBm\n", + j, sar_table.values[idx]); + } + } + + ret = iwl_mvm_send_cmd_pdu(mvm, REDUCE_TX_POWER_CMD, 0, + sizeof(cmd), &cmd); + if (ret) + IWL_ERR(mvm, "failed to set per-chain TX power: %d\n", ret); + + return ret; +} + int iwl_mvm_up(struct iwl_mvm *mvm) { int ret, i; @@ -1077,6 +1246,10 @@ int iwl_mvm_up(struct iwl_mvm *mvm) if (!test_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status)) iwl_mvm_unref(mvm, IWL_MVM_REF_UCODE_DOWN); + ret = iwl_mvm_sar_init(mvm); + if (ret) + goto error; + IWL_DEBUG_INFO(mvm, "RT uCode started.\n"); return 0; error: -- 2.39.5