From c585a92b2f9c624b0b62b2af1eb0ea6d11cb5cac Mon Sep 17 00:00:00 2001 From: Seema Sreemantha Date: Mon, 6 Feb 2023 12:21:44 +0530 Subject: Bluetooth: btintel: Set Per Platform Antenna Gain(PPAG) MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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 Signed-off-by: Seema Sreemantha Signed-off-by: Luiz Augusto von Dentz --- drivers/bluetooth/btintel.c | 116 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 116 insertions(+) (limited to 'drivers/bluetooth/btintel.c') diff --git a/drivers/bluetooth/btintel.c b/drivers/bluetooth/btintel.c index d4e2cb9a4eb4..bede8b005594 100644 --- a/drivers/bluetooth/btintel.c +++ b/drivers/bluetooth/btintel.c @@ -9,6 +9,7 @@ #include #include #include +#include #include #include @@ -24,6 +25,9 @@ #define ECDSA_OFFSET 644 #define ECDSA_HEADER_LEN 320 +#define BTINTEL_PPAG_NAME "PPAG" +#define BTINTEL_PPAG_PREFIX "\\_SB_.PCI0.XHCI.RHUB" + #define CMD_WRITE_BOOT_PARAMS 0xfc0e struct cmd_write_boot_params { __le32 boot_addr; @@ -1278,6 +1282,63 @@ static int btintel_read_debug_features(struct hci_dev *hdev, return 0; } +static acpi_status btintel_ppag_callback(acpi_handle handle, u32 lvl, void *data, + void **ret) +{ + acpi_status status; + size_t len; + struct btintel_ppag *ppag = data; + union acpi_object *p, *elements; + struct acpi_buffer string = {ACPI_ALLOCATE_BUFFER, NULL}; + struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; + struct hci_dev *hdev = ppag->hdev; + + status = acpi_get_name(handle, ACPI_FULL_PATHNAME, &string); + if (ACPI_FAILURE(status)) { + bt_dev_warn(hdev, "ACPI Failure: %s", acpi_format_exception(status)); + return status; + } + + if (strncmp(BTINTEL_PPAG_PREFIX, string.pointer, + strlen(BTINTEL_PPAG_PREFIX))) { + kfree(string.pointer); + return AE_OK; + } + + len = strlen(string.pointer); + if (strncmp((char *)string.pointer + len - 4, BTINTEL_PPAG_NAME, 4)) { + kfree(string.pointer); + return AE_OK; + } + kfree(string.pointer); + + status = acpi_evaluate_object(handle, NULL, NULL, &buffer); + if (ACPI_FAILURE(status)) { + bt_dev_warn(hdev, "ACPI Failure: %s", acpi_format_exception(status)); + return status; + } + + p = buffer.pointer; + ppag = (struct btintel_ppag *)data; + + if (p->type != ACPI_TYPE_PACKAGE || p->package.count != 2) { + kfree(buffer.pointer); + bt_dev_warn(hdev, "Invalid object type: %d or package count: %d", + p->type, p->package.count); + return AE_ERROR; + } + + elements = p->package.elements; + + /* PPAG table is located at element[1] */ + p = &elements[1]; + + ppag->domain = (u32)p->package.elements[0].integer.value; + ppag->mode = (u32)p->package.elements[1].integer.value; + kfree(buffer.pointer); + return AE_CTRL_TERMINATE; +} + static int btintel_set_debug_features(struct hci_dev *hdev, const struct intel_debug_features *features) { @@ -2251,6 +2312,58 @@ error: return err; } +static void btintel_set_ppag(struct hci_dev *hdev, struct intel_version_tlv *ver) +{ + acpi_status status; + struct btintel_ppag ppag; + struct sk_buff *skb; + struct btintel_loc_aware_reg ppag_cmd; + + /* PPAG is not supported if CRF is HrP2, Jfp2, JfP1 */ + switch (ver->cnvr_top & 0xFFF) { + case 0x504: /* Hrp2 */ + case 0x202: /* Jfp2 */ + case 0x201: /* Jfp1 */ + return; + } + + memset(&ppag, 0, sizeof(ppag)); + + ppag.hdev = hdev; + status = acpi_walk_namespace(ACPI_TYPE_ANY, ACPI_ROOT_OBJECT, + ACPI_UINT32_MAX, NULL, + btintel_ppag_callback, &ppag, NULL); + + if (ACPI_FAILURE(status)) { + /* Do not log warning message if ACPI entry is not found */ + if (status == AE_NOT_FOUND) + return; + bt_dev_warn(hdev, "PPAG: ACPI Failure: %s", acpi_format_exception(status)); + return; + } + + if (ppag.domain != 0x12) { + bt_dev_warn(hdev, "PPAG-BT Domain disabled"); + return; + } + + /* PPAG mode, BIT0 = 0 Disabled, BIT0 = 1 Enabled */ + if (!(ppag.mode & BIT(0))) { + bt_dev_dbg(hdev, "PPAG disabled"); + return; + } + + ppag_cmd.mcc = cpu_to_le32(0); + ppag_cmd.sel = cpu_to_le32(0); /* 0 - Enable , 1 - Disable, 2 - Testing mode */ + ppag_cmd.delta = cpu_to_le32(0); + skb = __hci_cmd_sync(hdev, 0xfe19, sizeof(ppag_cmd), &ppag_cmd, HCI_CMD_TIMEOUT); + if (IS_ERR(skb)) { + bt_dev_warn(hdev, "Failed to send PPAG Enable (%ld)", PTR_ERR(skb)); + return; + } + kfree_skb(skb); +} + static int btintel_bootloader_setup_tlv(struct hci_dev *hdev, struct intel_version_tlv *ver) { @@ -2297,6 +2410,9 @@ static int btintel_bootloader_setup_tlv(struct hci_dev *hdev, hci_dev_clear_flag(hdev, HCI_QUALITY_REPORT); + /* Set PPAG feature */ + btintel_set_ppag(hdev, ver); + /* Read the Intel version information after loading the FW */ err = btintel_read_version_tlv(hdev, &new_ver); if (err) -- cgit v1.2.3