Commit c585a92b authored by Seema Sreemantha's avatar Seema Sreemantha Committed by Luiz Augusto von Dentz
Browse files

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: default avatarKiran K <kiran.k@intel.com>
Signed-off-by: default avatarSeema Sreemantha <seema.sreemantha@intel.com>
Signed-off-by: default avatarLuiz Augusto von Dentz <luiz.von.dentz@intel.com>
parent 5cd39700

drivers/bluetooth/btintel.c

+116 −0
Original line number Diff line number Diff line
@@ -9,6 +9,7 @@ 
#include <linux/module.h>

#include <linux/firmware.h>

#include <linux/regmap.h>

#include <linux/acpi.h>

#include <asm/unaligned.h>



#include <net/bluetooth/bluetooth.h>
@@ -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 @@ static int btintel_configure_offload(struct hci_dev *hdev) 
	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)

drivers/bluetooth/btintel.h

+13 −0
Original line number Diff line number Diff line
@@ -137,6 +137,19 @@ struct intel_offload_use_cases { 
	__u8	preset[8];

} __packed;



/* structure to store the PPAG data read from ACPI table */

struct btintel_ppag {

	u32	domain;

	u32     mode;

	struct hci_dev *hdev;

};



struct btintel_loc_aware_reg {

	__le32 mcc;

	__le32 sel;

	__le32 delta;

} __packed;



#define INTEL_HW_PLATFORM(cnvx_bt)	((u8)(((cnvx_bt) & 0x0000ff00) >> 8))

#define INTEL_HW_VARIANT(cnvx_bt)	((u8)(((cnvx_bt) & 0x003f0000) >> 16))

#define INTEL_CNVX_TOP_TYPE(cnvx_top)	((cnvx_top) & 0x00000fff)