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Bluetooth: btintel: Set Per Platform Antenna Gain(PPAG)
Antenna gain is defined as the antenna’s ability to increase the Tx power in a given direction. Intel is certifying its products with fixed reference antenna peak gain values (3/5dBi). The feature takes into account the actual antenna gain, and increases output power values, which results in a performance improvement. After firmware download is completed, driver reads from ACPI table and configures PPAG as required. ACPI table entry for PPAG is defined as below. Name (PPAG, Package (0x02) { 0x00000001, Package (0x02) { 0x00000012, /* Bluetooth Domain */ 0x00000001 /* 1 - Enable PPAG, 0 - Disable PPAG */ } }) btmon log: < HCI Command: Intel Configure Per Platform Antenna Gain (0x3f|0x0219) plen 12 Mcc: 0x00000000 Selector: Enable Delta: 0x00000000 > HCI Event: Command Complete (0x0e) plen 4 Intel Configure Per Platform Antenna Gain (0x3f|0x0219) ncmd 1 Status: Success (0x00) Signed-off-by: Kiran K <kiran.k@intel.com> Signed-off-by: Seema Sreemantha <seema.sreemantha@intel.com> Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
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@ -9,6 +9,7 @@
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#include <linux/module.h>
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#include <linux/firmware.h>
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#include <linux/regmap.h>
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#include <linux/acpi.h>
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#include <asm/unaligned.h>
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#include <net/bluetooth/bluetooth.h>
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@ -24,6 +25,9 @@
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#define ECDSA_OFFSET 644
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#define ECDSA_HEADER_LEN 320
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#define BTINTEL_PPAG_NAME "PPAG"
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#define BTINTEL_PPAG_PREFIX "\\_SB_.PCI0.XHCI.RHUB"
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#define CMD_WRITE_BOOT_PARAMS 0xfc0e
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struct cmd_write_boot_params {
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__le32 boot_addr;
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@ -1278,6 +1282,63 @@ static int btintel_read_debug_features(struct hci_dev *hdev,
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return 0;
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}
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static acpi_status btintel_ppag_callback(acpi_handle handle, u32 lvl, void *data,
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void **ret)
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{
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acpi_status status;
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size_t len;
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struct btintel_ppag *ppag = data;
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union acpi_object *p, *elements;
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struct acpi_buffer string = {ACPI_ALLOCATE_BUFFER, NULL};
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struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
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struct hci_dev *hdev = ppag->hdev;
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status = acpi_get_name(handle, ACPI_FULL_PATHNAME, &string);
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if (ACPI_FAILURE(status)) {
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bt_dev_warn(hdev, "ACPI Failure: %s", acpi_format_exception(status));
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return status;
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}
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if (strncmp(BTINTEL_PPAG_PREFIX, string.pointer,
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strlen(BTINTEL_PPAG_PREFIX))) {
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kfree(string.pointer);
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return AE_OK;
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}
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len = strlen(string.pointer);
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if (strncmp((char *)string.pointer + len - 4, BTINTEL_PPAG_NAME, 4)) {
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kfree(string.pointer);
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return AE_OK;
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}
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kfree(string.pointer);
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status = acpi_evaluate_object(handle, NULL, NULL, &buffer);
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if (ACPI_FAILURE(status)) {
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bt_dev_warn(hdev, "ACPI Failure: %s", acpi_format_exception(status));
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return status;
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}
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p = buffer.pointer;
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ppag = (struct btintel_ppag *)data;
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if (p->type != ACPI_TYPE_PACKAGE || p->package.count != 2) {
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kfree(buffer.pointer);
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bt_dev_warn(hdev, "Invalid object type: %d or package count: %d",
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p->type, p->package.count);
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return AE_ERROR;
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}
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elements = p->package.elements;
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/* PPAG table is located at element[1] */
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p = &elements[1];
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ppag->domain = (u32)p->package.elements[0].integer.value;
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ppag->mode = (u32)p->package.elements[1].integer.value;
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kfree(buffer.pointer);
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return AE_CTRL_TERMINATE;
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}
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static int btintel_set_debug_features(struct hci_dev *hdev,
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const struct intel_debug_features *features)
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{
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@ -2251,6 +2312,58 @@ error:
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return err;
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}
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static void btintel_set_ppag(struct hci_dev *hdev, struct intel_version_tlv *ver)
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{
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acpi_status status;
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struct btintel_ppag ppag;
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struct sk_buff *skb;
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struct btintel_loc_aware_reg ppag_cmd;
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/* PPAG is not supported if CRF is HrP2, Jfp2, JfP1 */
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switch (ver->cnvr_top & 0xFFF) {
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case 0x504: /* Hrp2 */
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case 0x202: /* Jfp2 */
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case 0x201: /* Jfp1 */
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return;
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}
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memset(&ppag, 0, sizeof(ppag));
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ppag.hdev = hdev;
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status = acpi_walk_namespace(ACPI_TYPE_ANY, ACPI_ROOT_OBJECT,
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ACPI_UINT32_MAX, NULL,
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btintel_ppag_callback, &ppag, NULL);
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if (ACPI_FAILURE(status)) {
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/* Do not log warning message if ACPI entry is not found */
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if (status == AE_NOT_FOUND)
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return;
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bt_dev_warn(hdev, "PPAG: ACPI Failure: %s", acpi_format_exception(status));
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return;
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}
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if (ppag.domain != 0x12) {
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bt_dev_warn(hdev, "PPAG-BT Domain disabled");
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return;
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}
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/* PPAG mode, BIT0 = 0 Disabled, BIT0 = 1 Enabled */
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if (!(ppag.mode & BIT(0))) {
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bt_dev_dbg(hdev, "PPAG disabled");
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return;
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}
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ppag_cmd.mcc = cpu_to_le32(0);
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ppag_cmd.sel = cpu_to_le32(0); /* 0 - Enable , 1 - Disable, 2 - Testing mode */
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ppag_cmd.delta = cpu_to_le32(0);
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skb = __hci_cmd_sync(hdev, 0xfe19, sizeof(ppag_cmd), &ppag_cmd, HCI_CMD_TIMEOUT);
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if (IS_ERR(skb)) {
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bt_dev_warn(hdev, "Failed to send PPAG Enable (%ld)", PTR_ERR(skb));
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return;
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}
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kfree_skb(skb);
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}
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static int btintel_bootloader_setup_tlv(struct hci_dev *hdev,
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struct intel_version_tlv *ver)
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{
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@ -2297,6 +2410,9 @@ static int btintel_bootloader_setup_tlv(struct hci_dev *hdev,
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hci_dev_clear_flag(hdev, HCI_QUALITY_REPORT);
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/* Set PPAG feature */
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btintel_set_ppag(hdev, ver);
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/* Read the Intel version information after loading the FW */
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err = btintel_read_version_tlv(hdev, &new_ver);
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if (err)
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@ -137,6 +137,19 @@ struct intel_offload_use_cases {
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__u8 preset[8];
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} __packed;
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/* structure to store the PPAG data read from ACPI table */
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struct btintel_ppag {
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u32 domain;
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u32 mode;
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struct hci_dev *hdev;
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};
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struct btintel_loc_aware_reg {
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__le32 mcc;
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__le32 sel;
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__le32 delta;
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} __packed;
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#define INTEL_HW_PLATFORM(cnvx_bt) ((u8)(((cnvx_bt) & 0x0000ff00) >> 8))
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#define INTEL_HW_VARIANT(cnvx_bt) ((u8)(((cnvx_bt) & 0x003f0000) >> 16))
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#define INTEL_CNVX_TOP_TYPE(cnvx_top) ((cnvx_top) & 0x00000fff)
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