From patchwork Thu Jun 20 15:06:35 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kiran K X-Patchwork-Id: 806042 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.9]) (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 ECAF41AE869 for ; Thu, 20 Jun 2024 14:52:14 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=192.198.163.9 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718895136; cv=none; b=lU8RlqYKfue6nymhar17SmWGeUgTGHMwVLDn/6gZvqaD/9lsYHFjJrkH4GmnqSbblZnZcDdL/ISamtKRCUki9KGxa8UPJFsFcJrwITPFnhYzSfwgOIEX0GnSqm6nXFiQrB6LatNlFSU1TBRvvoOp1oDyOe+fatiWCZOQVef0d8Y= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718895136; c=relaxed/simple; bh=R3VE8vdrAuyn/0OkeY8ZInSecUeKr44wwZO6xSBfJZU=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=SGbSKSqkwyRe9T0sleLXFY/3lNSUm7w1JqeyKcMe3wDPfWNFZumISdvz06YeW+N90mO+0neTt6eDJI4LIwFGnFpb+66l1B77iGUWla59xhNV0ZG1ZWZyUSvl1/kvMXW+0r5zqMclnYCo5sfUBAI7gZAytYrdGr6yiGT26AguGK4= 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=hTTlPXtK; arc=none smtp.client-ip=192.198.163.9 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="hTTlPXtK" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1718895135; x=1750431135; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=R3VE8vdrAuyn/0OkeY8ZInSecUeKr44wwZO6xSBfJZU=; b=hTTlPXtKcy51AtF9h8nqvG6WhCPND3qdD/2lvJEzwoRJf7xVIUJftKci i0gdi9zGk1v3+PDDXWUbre1V4IrMWzEUI2kmyWqM40Q6SjMK2jj+LPEO6 GL90W9GwHYnN0w1nE/AyhXnZtJCSiR0CUTtUm1NTZ86C0zi1FvwxA0Z4S 5WCQ9LmdVhAXGWgIrn/aJgKffJNWiKptwcpU1ZZU+lnGIGCOjv1qKP9YA mroMbt4hS2492x36HvRxl6SKLktrM5VB3uP0DdJIhOt8yq4tAcvyZTdzD oTfsXZ5N5wsToKjhAIShaLZZ0ctTfWGXdX0VYdPVifS7zI3b1Zp3jyNwz Q==; X-CSE-ConnectionGUID: IJoDBijHTFiDBihHdFOlqw== X-CSE-MsgGUID: 0TalmbvXQIe/XVuFMlSFYQ== X-IronPort-AV: E=McAfee;i="6700,10204,11108"; a="26565847" X-IronPort-AV: E=Sophos;i="6.08,252,1712646000"; d="scan'208";a="26565847" Received: from fmviesa009.fm.intel.com ([10.60.135.149]) by fmvoesa103.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 20 Jun 2024 07:52:14 -0700 X-CSE-ConnectionGUID: 0wqUXeBRTZ6x5Pok06ai4Q== X-CSE-MsgGUID: T5bO642uTXWvuJzac8eBOQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.08,252,1712646000"; d="scan'208";a="42353556" Received: from intel-lenovo-legion-y540-15irh-pg0.iind.intel.com ([10.224.186.95]) by fmviesa009.fm.intel.com with ESMTP; 20 Jun 2024 07:52:12 -0700 From: Kiran K To: linux-bluetooth@vger.kernel.org Cc: ravishankar.srivatsa@intel.com, chethan.tumkur.narayan@intel.com, chandrashekar.devegowda@intel.com, vijay.satija@intel.com, Kiran K Subject: [PATCH v1] Bluetooth: btintel: Allow lowering of drive strength of BRI Date: Thu, 20 Jun 2024 20:36:35 +0530 Message-Id: <20240620150635.2119398-1-kiran.k@intel.com> X-Mailer: git-send-email 2.40.1 Precedence: bulk X-Mailing-List: linux-bluetooth@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 BRI (Bluetooth Radio Interface) traffic from CNVr to CNVi was found causing cross talk step errors to WiFi. As a workaround, driver needs to reduce the drive strength of BRI. During *setup*, driver reads the drive strength value from efi variable and passes it controller via vendor specific command with opcode 0xfc0a. Signed-off-by: Kiran K --- drivers/bluetooth/btintel.c | 115 ++++++++++++++++++++++++++++++++++++ 1 file changed, 115 insertions(+) diff --git a/drivers/bluetooth/btintel.c b/drivers/bluetooth/btintel.c index 5d735391545a..1d6586b30c8d 100644 --- a/drivers/bluetooth/btintel.c +++ b/drivers/bluetooth/btintel.c @@ -12,6 +12,8 @@ #include #include #include +#include + #include #include @@ -49,6 +51,39 @@ static const guid_t btintel_guid_dsm = GUID_INIT(0xaa10f4e0, 0x81ac, 0x4233, 0xab, 0xf6, 0x3b, 0x2a, 0xc5, 0x0e, 0x28, 0xd9); +static void *btintel_uefi_get_variable(efi_char16_t *name, efi_guid_t *guid) +{ +#if defined(CONFIG_EFI) + void *data; + efi_status_t status; + size_t data_size = 0; + + if (!efi_rt_services_supported(EFI_RT_SUPPORTED_GET_VARIABLE)) + return ERR_PTR(-EOPNOTSUPP); + + status = efi.get_variable(name, guid, NULL, &data_size, NULL); + + if (status != EFI_BUFFER_TOO_SMALL || !data_size) + return ERR_PTR(-EIO); + + data = kmalloc(data_size, GFP_KERNEL); + + if (!data) + return ERR_PTR(-ENOMEM); + + status = efi.get_variable(name, guid, NULL, &data_size, data); + + if (status != EFI_SUCCESS) { + kfree(data); + return ERR_PTR(-ENXIO); + } + + return data; +#else + return ERR_PTR(-EOPNOTSUPP); +#endif +} + int btintel_check_bdaddr(struct hci_dev *hdev) { struct hci_rp_read_bd_addr *bda; @@ -2615,6 +2650,80 @@ static u8 btintel_classify_pkt_type(struct hci_dev *hdev, struct sk_buff *skb) return hci_skb_pkt_type(skb); } +static int btintel_set_dsbr(struct hci_dev *hdev, struct intel_version_tlv *ver) +{ + struct btintel_dsbr_cmd { + u8 enable; + u8 dsbr; + } __packed; + + struct btintel_dsbr { + u8 header; + u32 dsbr; + } __packed; + + struct btintel_dsbr *dsbr; + struct btintel_dsbr_cmd cmd; + struct sk_buff *skb; + u8 status; + efi_guid_t guid = EFI_GUID(0xe65d8884, 0xd4af, 0x4b20, 0x8d, 0x03, + 0x77, 0x2e, 0xcc, 0x3d, 0xa5, 0x31); + + memset(&cmd, 0, sizeof(cmd)); + dsbr = btintel_uefi_get_variable(L"UefiCnvCommonDSBR", &guid); + if (IS_ERR(dsbr)) { + /* If efi variable is not present, driver still needs to send + * 0xfc0a command with default values + */ + bt_dev_dbg(hdev, "Error reading efi DSBR (%ld)", + PTR_ERR(dsbr)); + dsbr = NULL; + } + + if (dsbr) { + /* bit0: 0 - Use firmware default value + * 1 - Override firmware value + * bit3:1 - Reserved + * bit7:4 - DSBR override values + * bt31:7 - Reserved + */ + cmd.enable = dsbr->dsbr & BIT(0); + if (cmd.enable) + cmd.dsbr = dsbr->dsbr >> 4 & 0xF; + kfree(dsbr); + } + + bt_dev_info(hdev, "dsbr: enabled: 0x%2.2x value: 0x%2.2x", cmd.enable, + cmd.dsbr); + + skb = __hci_cmd_sync(hdev, 0xfc0a, sizeof(cmd), &cmd, HCI_CMD_TIMEOUT); + if (IS_ERR(skb)) { + bt_dev_err(hdev, "Failed to send Intel DSBR command (%ld)", + PTR_ERR(skb)); + return -bt_to_errno(PTR_ERR(skb)); + } + + status = skb->data[0]; + kfree_skb(skb); + + if (status) { + bt_dev_err(hdev, "Set DSBR failed 0x%2.2x", status); + return -bt_to_errno(status); + } + return 0; +} + +static int btintel_apply_dsbr(struct hci_dev *hdev, + struct intel_version_tlv *ver) +{ + /* For BlazarI + B0 step, DSBR command needs to be sent just after + * downloading IML firmware + */ + return ver->img_type == BTINTEL_IMG_IML && + ((ver->cnvi_top & 0xfff) == BTINTEL_CNVI_BLAZARI) && + INTEL_CNVX_TOP_STEP(ver->cnvi_top) == 0x01; +} + int btintel_bootloader_setup_tlv(struct hci_dev *hdev, struct intel_version_tlv *ver) { @@ -2649,6 +2758,12 @@ int btintel_bootloader_setup_tlv(struct hci_dev *hdev, if (err) return err; + if (btintel_apply_dsbr(hdev, ver)) { + err = btintel_set_dsbr(hdev, ver); + if (err) + return err; + } + /* If image type returned is BTINTEL_IMG_IML, then controller supports * intermediae loader image */