From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.19]) (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 9DAF254705D for ; Fri, 18 Sep 2026 08:42:30 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=192.198.163.19 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789720953; cv=none; b=e0botTP90fzN1+DR1MitP1pPBADBbKvsuRCjtBauTieM88s52Bnb9RxWM+V3TxAMGG5vvN99dKGpq8UFTQfT3subzg+5sUohP+PdLworQxF4lVNSjgLMxtt/FqyyD+W9DQeQgdtz4aN4LVPbAVULOMkGO7GCupONU0ev/BW3L/U= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789720953; c=relaxed/simple; bh=LwRGBigrQxWEgWscFUr57wFYM+5K/bXakPX/dLGfT0M=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=TU+UZxIc0Fk9bR1i5+0ssTKN9/KQCxzmmIIp2E2K+wTZS141d7q9Wz7ehrOtHY1suK3JAlzaqptD3ZMNri2fpxqK3xEJjGWUa8YwNsu3bV5Hg4cFXw58tjpaJKGveqKm2zwriMCuo6OmsBr3A3c/+ps9LJz8AIS3AWUFYpNAbls= 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=n4BNn7+9; arc=none smtp.client-ip=192.198.163.19 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="n4BNn7+9" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1789720951; x=1821256951; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=LwRGBigrQxWEgWscFUr57wFYM+5K/bXakPX/dLGfT0M=; b=n4BNn7+98ckfc4REPxab5LLbBprR8By3hTKx8v7+fV7mkWsgNYaXzEq1 opY29nIDl9owW8UkFeHCTfOqUnEiDbLssfl7QORQfslbMbs63DkI9EBtd zciAGIwczi+02xV8dmzm5+y5GcX1Ij0th3ZXqXxoDSuo4Ofy7sYgzCW+8 62N9Pxow/3nl9bf56rocIu3yctT81zov8Dr7dE1HPDTztpUeqfEnsLov4 lZ0frCcSod+7Cwbspe/sL904GKRsWo6AKP3AzjY7+ClFDokwHGI16lJAe aJT9ULKTLBAYE2MzQ3NVuilZtu3uTfVgJRRpU8N77LGQWUNzw9JlQvCVK g==; X-CSE-ConnectionGUID: CLWaMOpwTsWBeMDBEl2CCw== X-CSE-MsgGUID: L+zLKe2KRVmR1kwFf+98iA== X-IronPort-AV: E=McAfee;i="6800,10657,11905"; a="89142785" X-IronPort-AV: E=Sophos;i="6.27,103,1787036400"; d="scan'208";a="89142785" Received: from fmviesa008.fm.intel.com ([10.60.135.148]) by fmvoesa113.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 18 Sep 2026 01:42:30 -0700 X-CSE-ConnectionGUID: 7FJq5H7zQn2HKn9yda5loQ== X-CSE-MsgGUID: m2KfEt1SR6a7sKRaZkov2w== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.27,103,1787036400"; d="scan'208";a="271618505" Received: from unknown (HELO WEBA2062.iind.intel.com) ([10.66.228.2]) by fmviesa008.fm.intel.com with ESMTP; 18 Sep 2026 01:42:27 -0700 From: Ravindra To: linux-bluetooth@vger.kernel.org Cc: chethan.tumkur.narayan@intel.com, kiran.k@intel.com, Ravindra , Paul Menzel Subject: [PATCH v3] Bluetooth: btintel: read ROM debug registers on FW download failure Date: Fri, 18 Sep 2026 14:14:57 +0530 Message-ID: <20260918084457.2746999-1-ravindra@intel.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-bluetooth@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit The bootloader records init sequence progress and debug info in four core debug registers, useful for debugging FW download failures. Add btintel_get_rom_debug_info() to issue BTINTEL_GET_ROM_DEBUG_INFO (0xfcde) and log these registers, and invoke it from every FW download failure and timeout path: btintel_download_fw() (legacy .sfi flow) and btintel_prepare_fw_download_tlv() (TLV flow), before resetting to the bootloader. Tested by corrupting the operational firmware file to force a download timeout; the driver logged the debug registers on each failure and retry, e.g.: Bluetooth: hci0: Firmware loading timeout Bluetooth: Intel get rom debug info: dr0:0x80000001 dr1:0x00000000 dr2:0x00000001 dr3:0x00df0071 Signed-off-by: Ravindra Reviewed-by: Paul Menzel --- drivers/bluetooth/btintel.c | 51 +++++++++++++++++++++++++++++++++++-- drivers/bluetooth/btintel.h | 9 +++++++ 2 files changed, 58 insertions(+), 2 deletions(-) diff --git a/drivers/bluetooth/btintel.c b/drivers/bluetooth/btintel.c index e998fd390ad2..fc204c708f35 100644 --- a/drivers/bluetooth/btintel.c +++ b/drivers/bluetooth/btintel.c @@ -983,6 +983,41 @@ int btintel_send_intel_reset(struct hci_dev *hdev, u32 boot_param) } EXPORT_SYMBOL_GPL(btintel_send_intel_reset); +static void btintel_get_rom_debug_info(struct hci_dev *hdev) +{ + struct btintel_rp_get_rom_debug_info *rom_debug_info; + struct sk_buff *skb; + + skb = __hci_cmd_sync(hdev, BTINTEL_GET_ROM_DEBUG_INFO, 0, NULL, + HCI_CMD_TIMEOUT); + if (IS_ERR(skb)) { + bt_dev_err(hdev, "Failed to send Intel get rom debug info command (%ld)", + PTR_ERR(skb)); + return; + } + + if (skb->len != sizeof(*rom_debug_info)) { + bt_dev_err(hdev, + "Intel get rom debug info size mismatch (%u != %zu)", + skb->len, sizeof(*rom_debug_info)); + kfree_skb(skb); + return; + } + + rom_debug_info = (struct btintel_rp_get_rom_debug_info *)skb->data; + + /* A non-zero status here would have already been turned into an + * error by the HCI core and reported via the IS_ERR(skb) check above. + */ + bt_dev_info(hdev, "Intel get rom debug info: dr0:0x%08x dr1:0x%08x dr2:0x%08x dr3:0x%08x", + le32_to_cpu(rom_debug_info->debug_reg0), + le32_to_cpu(rom_debug_info->debug_reg1), + le32_to_cpu(rom_debug_info->debug_reg2), + le32_to_cpu(rom_debug_info->debug_reg3)); + + kfree_skb(skb); +} + int btintel_read_boot_params(struct hci_dev *hdev, struct intel_boot_params *params) { @@ -2232,6 +2267,9 @@ download: goto done; } + /* Collect rom debug info on FW download failure */ + btintel_get_rom_debug_info(hdev); + /* When FW download fails, send Intel Reset to retry * FW download. */ @@ -2251,8 +2289,11 @@ download: * of this device. */ err = btintel_download_wait(hdev, calltime, INTEL_SLE_MULTIPLIER * 5000); - if (err == -ETIMEDOUT) + if (err == -ETIMEDOUT) { + /* Collect rom debug info on FW download failure */ + btintel_get_rom_debug_info(hdev); btintel_reset_to_bootloader(hdev); + } done: release_firmware(fw); @@ -2492,6 +2533,9 @@ static int btintel_prepare_fw_download_tlv(struct hci_dev *hdev, goto done; } + /* Collect rom debug info on FW download failure */ + btintel_get_rom_debug_info(hdev); + /* When FW download fails, send Intel Reset to retry * FW download. */ @@ -2511,8 +2555,11 @@ static int btintel_prepare_fw_download_tlv(struct hci_dev *hdev, * of this device. */ err = btintel_download_wait(hdev, calltime, INTEL_SLE_MULTIPLIER * 5000); - if (err == -ETIMEDOUT) + if (err == -ETIMEDOUT) { + /* Collect rom debug info on FW download failure */ + btintel_get_rom_debug_info(hdev); btintel_reset_to_bootloader(hdev); + } done: { diff --git a/drivers/bluetooth/btintel.h b/drivers/bluetooth/btintel.h index 586be92b7690..0f7261c102b8 100644 --- a/drivers/bluetooth/btintel.h +++ b/drivers/bluetooth/btintel.h @@ -188,6 +188,15 @@ struct hci_ppag_enable_cmd { __le32 ppag_enable_flags; } __packed; +#define BTINTEL_GET_ROM_DEBUG_INFO 0xfcde +struct btintel_rp_get_rom_debug_info { + __u8 status; + __le32 debug_reg0; + __le32 debug_reg1; + __le32 debug_reg2; + __le32 debug_reg3; +} __packed; + #define INTEL_TLV_TYPE_ID 0x01 #define INTEL_TLV_SYSTEM_EXCEPTION 0x00 -- 2.43.0