From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B90DE1632DD for ; Thu, 30 Apr 2026 16:32:45 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=192.198.163.17 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777566768; cv=none; b=eHyc9Tp57YIpmpbWMfckTWRdgMF2FxuQeF9cqpg3lHY+gzHEKnWNdgk6/G3SqCGj2tIwclt8yqEbvxuJmlaGii67hrHxCTNBLdWd2ZVfg7O8tl67rkmEnXIAfB1VtI0RorF/kq0vUqvEkTrJ2Vo49QYIz8/fS11fUICokB+Jga4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777566768; c=relaxed/simple; bh=Qr5a90ezAl1KJS9kkrOeZW1NCQSAciCm46MSAPQoagU=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=NtXSypp9kiDyqAXCBspg018bU/R6rHcMSpBdiuvyQQvBaAunOT8NWUrTjp1hDxOfqgB5+2QWPaQ2ZEc1WG3d0FsFm2U9V50qvieTudm+uD4q5ChVMgDNq9BvssiIp4isWlazk+5otVT/VYSpXGE9Ljxi4beEMLFmngHdM6/2h/U= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com; spf=pass smtp.mailfrom=intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=KHEPMIvI; arc=none smtp.client-ip=192.198.163.17 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="KHEPMIvI" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1777566765; x=1809102765; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=Qr5a90ezAl1KJS9kkrOeZW1NCQSAciCm46MSAPQoagU=; b=KHEPMIvItzf2M+sMEliVylEpVZOuWyacV2vjnUZZ1lKgIY1CZZ04OXe3 KPFyh2OIGQl1Z7jidU95l9paPqF0gf5MsY4PDp3AGnee++tvYYT2hbjjY tNU6rpXl3nb4/9LQ5GfBmQel7gC9mIPLRmBrIMQMs6/Bl0e67OL1fMYAS J6aFFM3pedARHOEq1tTpDGYrmCJjfaynNtbwljhwRHiUdRIkt9i1Xfg/A v3i7c7Uge61hmkkzO99MdkkiGo5prz8UC3alPojRRl97PXAZMqctqtneb uk3sG5+6/icY49BiiJ0SY7KfUTq05Zn8r1wx6MjpJ0Mf4O5hGuZbzDUsA w==; X-CSE-ConnectionGUID: dbBJD7wTRLKwxwlOhpvRjg== X-CSE-MsgGUID: 6ZhXXnUYTr+to8TzNnwxdA== X-IronPort-AV: E=McAfee;i="6800,10657,11772"; a="78394137" X-IronPort-AV: E=Sophos;i="6.23,208,1770624000"; d="scan'208";a="78394137" Received: from fmviesa009.fm.intel.com ([10.60.135.149]) by fmvoesa111.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 30 Apr 2026 09:32:45 -0700 X-CSE-ConnectionGUID: sL97Ag/CTUy78J5+f/NOog== X-CSE-MsgGUID: gwSWpfXcSS6xmHBPuDfmuw== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.23,208,1770624000"; d="scan'208";a="228135795" Received: from intel-lenovo-legion-y540-15irh-pg0.iind.intel.com ([10.224.186.95]) by fmviesa009.fm.intel.com with ESMTP; 30 Apr 2026 09:32:43 -0700 From: Kiran K To: linux-bluetooth@vger.kernel.org Cc: ravishankar.srivatsa@intel.com, chethan.tumkur.narayan@intel.com, ravindra@intel.com, Kiran K Subject: [PATCH v1] bluetooth: btintel: Add Bluetooth SAR revision 2 support Date: Thu, 30 Apr 2026 22:21:23 +0530 Message-ID: <20260430165123.1070214-1-kiran.k@intel.com> X-Mailer: git-send-email 2.53.0 Precedence: bulk X-Mailing-List: linux-bluetooth@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit BRDS revision 2 introduces per-chain (Chain A and Chain B) TX power limits across five sub-bands (2.4G, 5.2G, 5.8/5.9G, 6G-low, 6G-high), replacing the single-chain per-modulation model of revisions 0 and 1. - Add btintel_set_sar_rev2() which sends the full Rev2 DDC sequence: 0x019e inc-power-mode enable flag (1 byte) 0x0311 2.4 GHz sub-band limits (2 bytes) 0x0312 5.2 GHz sub-band limits (2 bytes) 0x0313 5.8/5.9 GHz sub-band limits (2 bytes) 0x0314 5.8/5.9 GHz sub-band limits again (2 bytes, duplicate FW reg) 0x0315 6 GHz low sub-band limits (2 bytes) 0x0316 6 GHz high sub-band limits (2 bytes) followed by the SAR-init-complete command (0xfe25). Signed-off-by: Ravindra Signed-off-by: Kiran K --- drivers/bluetooth/btintel.c | 154 +++++++++++++++++++++++++++++++++++- drivers/bluetooth/btintel.h | 18 +++++ 2 files changed, 171 insertions(+), 1 deletion(-) diff --git a/drivers/bluetooth/btintel.c b/drivers/bluetooth/btintel.c index 5e9cac090bd8..97d897623c94 100644 --- a/drivers/bluetooth/btintel.c +++ b/drivers/bluetooth/btintel.c @@ -51,6 +51,7 @@ enum { #define BTINTEL_BT_DOMAIN 0x12 #define BTINTEL_SAR_LEGACY 0 #define BTINTEL_SAR_INC_PWR 1 +#define BTINTEL_SAR_REV2 2 #define BTINTEL_SAR_INC_PWR_SUPPORTED 0 #define CMD_WRITE_BOOT_PARAMS 0xfc0e @@ -3104,6 +3105,111 @@ static int btintel_set_mutual_sar(struct hci_dev *hdev, struct btintel_sar_inc_p return 0; } +/* btintel_send_sar_rev2_band - send DDC command for one Rev2 sub-band + * + * Each DDC 0x0311-0x0316 carries 2 bytes: [ChainA_value, ChainB_value]. + * cmd->len = 4 (2 id + 2 data) + * HCI total = 5 bytes (1 len + 4) + */ +static int btintel_send_sar_rev2_band(struct hci_dev *hdev, + struct btintel_cp_ddc_write *cmd, + u16 id, u8 chain_a, u8 chain_b) +{ + cmd->len = 4; + cmd->id = cpu_to_le16(id); + cmd->data[0] = chain_a; + cmd->data[1] = chain_b; + return btintel_send_sar_ddc(hdev, cmd, 5); +} + +static int btintel_set_sar_rev2(struct hci_dev *hdev, + struct btintel_sar_rev2 *sar) +{ + struct btintel_cp_ddc_write *cmd; + struct sk_buff *skb; + u8 buffer[64]; + bool enable; + int ret; + + cmd = (void *)buffer; + + /* DDC 0x019e: enable/disable increased power mode SAR (1 byte) */ + cmd->len = 3; + cmd->id = cpu_to_le16(0x019e); + cmd->data[0] = (sar->inc_power_mode == BTINTEL_SAR_INC_PWR_SUPPORTED) ? + 0x01 : 0x00; + ret = btintel_send_sar_ddc(hdev, cmd, 4); + if (ret) + return ret; + + /* DDC 0x0311-0x0316: per sub-band ChainA + ChainB limits */ + ret = btintel_send_sar_rev2_band(hdev, cmd, 0x0311, + sar->chain_a.subband_2g4, + sar->chain_b.subband_2g4); + if (ret) + return ret; + + ret = btintel_send_sar_rev2_band(hdev, cmd, 0x0312, + sar->chain_a.subband_5g2, + sar->chain_b.subband_5g2); + if (ret) + return ret; + + /* 0x0313 and 0x0314 both carry the 5G8/5G9 value */ + ret = btintel_send_sar_rev2_band(hdev, cmd, 0x0313, + sar->chain_a.subband_5g8_5g9, + sar->chain_b.subband_5g8_5g9); + if (ret) + return ret; + + ret = btintel_send_sar_rev2_band(hdev, cmd, 0x0314, + sar->chain_a.subband_5g8_5g9, + sar->chain_b.subband_5g8_5g9); + if (ret) + return ret; + + ret = btintel_send_sar_rev2_band(hdev, cmd, 0x0315, + sar->chain_a.subband_6g1, + sar->chain_b.subband_6g1); + if (ret) + return ret; + + ret = btintel_send_sar_rev2_band(hdev, cmd, 0x0316, + sar->chain_a.subband_6g3, + sar->chain_b.subband_6g3); + if (ret) + return ret; + + /* Notify firmware that SAR initialisation is complete */ + enable = true; + skb = __hci_cmd_sync(hdev, 0xfe25, 1, &enable, HCI_CMD_TIMEOUT); + if (IS_ERR(skb)) { + bt_dev_warn(hdev, "Failed to send Intel SAR Rev2 Enable (%ld)", + PTR_ERR(skb)); + return PTR_ERR(skb); + } + + kfree_skb(skb); + return 0; +} + +static int btintel_sar_rev2_send_to_device(struct hci_dev *hdev, + struct btintel_sar_rev2 *sar, + struct intel_version_tlv *ver) +{ + u16 cnvi = ver->cnvi_top & 0xfff; + u16 cnvr = ver->cnvr_top & 0xfff; + + if (cnvi < BTINTEL_CNVI_BLAZARI || cnvr != BTINTEL_CNVR_WHP2) { + bt_dev_dbg(hdev, "BT SAR Rev2 not supported on this platform (cnvi=0x%x cnvr=0x%x)", + cnvi, cnvr); + return -EOPNOTSUPP; + } + + bt_dev_info(hdev, "Applying Bluetooth SAR Rev2"); + return btintel_set_sar_rev2(hdev, sar); +} + static int btintel_sar_send_to_device(struct hci_dev *hdev, struct btintel_sar_inc_pwr *sar, struct intel_version_tlv *ver) { @@ -3130,6 +3236,7 @@ static int btintel_acpi_set_sar(struct hci_dev *hdev, struct intel_version_tlv * { union acpi_object *bt_pkg, *buffer = NULL; struct btintel_sar_inc_pwr sar; + struct btintel_sar_rev2 sar_rev2; acpi_status status; u8 revision; int ret; @@ -3150,14 +3257,59 @@ static int btintel_acpi_set_sar(struct hci_dev *hdev, struct intel_version_tlv * goto error; } + if (buffer->package.elements[0].type != ACPI_TYPE_INTEGER) { + bt_dev_warn(hdev, "BT_SAR: unexpected ACPI type for revision field"); + ret = -EINVAL; + goto error; + } + revision = buffer->package.elements[0].integer.value; - if (revision > BTINTEL_SAR_INC_PWR) { + if (revision > BTINTEL_SAR_REV2) { bt_dev_dbg(hdev, "BT_SAR: revision: 0x%2.2x not supported", revision); ret = -EOPNOTSUPP; goto error; } + if (revision == BTINTEL_SAR_REV2 && bt_pkg->package.count == 13) { + memset(&sar_rev2, 0, sizeof(sar_rev2)); + sar_rev2.revision = revision; + sar_rev2.bt_sar_bios = bt_pkg->package.elements[1].integer.value; + sar_rev2.inc_power_mode = bt_pkg->package.elements[2].integer.value; + + sar_rev2.chain_a.subband_2g4 = bt_pkg->package.elements[3].integer.value; + sar_rev2.chain_a.subband_5g2 = bt_pkg->package.elements[4].integer.value; + sar_rev2.chain_a.subband_5g8_5g9 = bt_pkg->package.elements[5].integer.value; + sar_rev2.chain_a.subband_6g1 = bt_pkg->package.elements[6].integer.value; + sar_rev2.chain_a.subband_6g3 = bt_pkg->package.elements[7].integer.value; + + sar_rev2.chain_b.subband_2g4 = bt_pkg->package.elements[8].integer.value; + sar_rev2.chain_b.subband_5g2 = bt_pkg->package.elements[9].integer.value; + sar_rev2.chain_b.subband_5g8_5g9 = bt_pkg->package.elements[10].integer.value; + sar_rev2.chain_b.subband_6g1 = bt_pkg->package.elements[11].integer.value; + sar_rev2.chain_b.subband_6g3 = bt_pkg->package.elements[12].integer.value; + + bt_dev_dbg(hdev, "BT SAR Rev2: revision=%u bt_sar_bios=%u inc_power_mode=%u", + sar_rev2.revision, sar_rev2.bt_sar_bios, sar_rev2.inc_power_mode); + bt_dev_dbg(hdev, "BT SAR Rev2 Chain A: 2g4=%u 5g2=%u 5g8_5g9=%u 6g1=%u 6g3=%u", + sar_rev2.chain_a.subband_2g4, sar_rev2.chain_a.subband_5g2, + sar_rev2.chain_a.subband_5g8_5g9, sar_rev2.chain_a.subband_6g1, + sar_rev2.chain_a.subband_6g3); + bt_dev_dbg(hdev, "BT SAR Rev2 Chain B: 2g4=%u 5g2=%u 5g8_5g9=%u 6g1=%u 6g3=%u", + sar_rev2.chain_b.subband_2g4, sar_rev2.chain_b.subband_5g2, + sar_rev2.chain_b.subband_5g8_5g9, sar_rev2.chain_b.subband_6g1, + sar_rev2.chain_b.subband_6g3); + + if (sar_rev2.bt_sar_bios != 1) { + bt_dev_info(hdev, "Bluetooth SAR Rev2 is not enabled"); + ret = -EOPNOTSUPP; + goto error; + } + + ret = btintel_sar_rev2_send_to_device(hdev, &sar_rev2, ver); + goto error; + } + memset(&sar, 0, sizeof(sar)); if (revision == BTINTEL_SAR_LEGACY && bt_pkg->package.count == 8) { diff --git a/drivers/bluetooth/btintel.h b/drivers/bluetooth/btintel.h index 70d812ad36a2..3b5a228ca3c0 100644 --- a/drivers/bluetooth/btintel.h +++ b/drivers/bluetooth/btintel.h @@ -64,6 +64,7 @@ struct intel_tlv { /* CNVR */ #define BTINTEL_CNVR_FMP2 0x910 +#define BTINTEL_CNVR_WHP2 0xA10 /* Whale Peak2 - Panther Lake */ #define BTINTEL_IMG_BOOTLOADER 0x01 /* Bootloader image */ #define BTINTEL_IMG_IML 0x02 /* Intermediate image */ @@ -202,6 +203,23 @@ struct btintel_sar_inc_pwr { u8 le_lr; }; +/* Bluetooth SAR feature (BRDS), Revision 2 - per-chain sub-band power limits */ +struct btintel_sar_band_limits { + u8 subband_2g4; + u8 subband_5g2; + u8 subband_5g8_5g9; + u8 subband_6g1; + u8 subband_6g3; +}; + +struct btintel_sar_rev2 { + u8 revision; + u32 bt_sar_bios; /* 1: BIOS-managed SAR enabled */ + u32 inc_power_mode; /* 0: supported, 1: disabled */ + struct btintel_sar_band_limits chain_a; + struct btintel_sar_band_limits chain_b; +}; + #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) -- 2.53.0