From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.15]) (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 26CF95C613 for ; Fri, 18 Sep 2026 06:01:11 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=192.198.163.15 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789711273; cv=none; b=o61AWGWZ842aKBdWueHbpjiKNzOla3F1URFHryyRvy2W/LZsAq0GFOtDLR56T/iA+eCnTry0qgwFqXo8/1tTVjjljlOVJIyQjY5BzTPdnNKd1SwrC61yA7ZTFbx+1V/x0GoRdeR/LLrySxwKLXQkxtbFjhiyXSomzHSzdlXItuQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789711273; c=relaxed/simple; bh=L1hyg7PvBcrXGVvoJZhZ3USMgc8rFLrkKrlawhh4E0Y=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=t1AkaTvwHNz5vrKtDE/PehlsQ42bKXMhCaVO/O+cl5EyWBZGD706mW0xZWw1RpVl4KYEQRFRab0hYsI5y1rB9b2jI9GXpEtPCaQleDWhj7QcFxCQm3OoHa3jz60xhyH6Ww4ThzicLCQCfaT7S2hGv1v62iMY4JbSjpW7JpcZgAI= 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=mauv18sn; arc=none smtp.client-ip=192.198.163.15 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="mauv18sn" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1789711272; x=1821247272; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=L1hyg7PvBcrXGVvoJZhZ3USMgc8rFLrkKrlawhh4E0Y=; b=mauv18snAXW0KtOq8pGszZCesYRQ7BS8ZsAcwFS7mMqMobujjTcAW6S8 sZ3EVXa+UVX1U0VJ2MNhnIjOBZOVyLOG0s3Ch0JzDYld4eN8B93dhxEXZ 0b4OsOAY4qWqYFt01FsMtp47luvgxav/38EF3qom/YhSRqUy67cQgUZ+T udTMuaV66jxbB/zKLY4gBC4hD8DGrTXv0bLO7mmLmvLxPUPFNJuIdZ5vQ yghYkDuNXAi0WFakKIWS+zIlEcHrIX2k2eWobK6nxsy2yWvJ13pzHoQYz trZG1yittLpMAqwGBpMYPwF/mzY+mZfRcESQKIuoMwjYhuXKLZN1Ueg6p A==; X-CSE-ConnectionGUID: d6Wjp/9FQC+pZHHxJWMaDQ== X-CSE-MsgGUID: TUX/dWwWS7CcfbmfFu0Lbw== X-IronPort-AV: E=McAfee;i="6800,10657,11905"; a="90327162" X-IronPort-AV: E=Sophos;i="6.27,103,1787036400"; d="scan'208";a="90327162" Received: from fmviesa012.fm.intel.com ([10.60.135.152]) by fmvoesa109.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Sep 2026 23:01:08 -0700 X-CSE-ConnectionGUID: AEEzu3CDQ8aFv5Eqyi+AUQ== X-CSE-MsgGUID: qIY3O+HmTXq2tykkp8rYvA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.27,103,1787036400"; d="scan'208";a="2411835" Received: from unknown (HELO WEBA2062.iind.intel.com) ([10.66.228.2]) by fmviesa012.fm.intel.com with ESMTP; 17 Sep 2026 23:01:07 -0700 From: Ravindra To: linux-bluetooth@vger.kernel.org Cc: chethan.tumkur.narayan@intel.com, kiran.k@intel.com, Ravindra , Paul Menzel Subject: [PATCH v2] Bluetooth: btintel: read ROM debug registers on FW download failure Date: Fri, 18 Sep 2026 11:33:36 +0530 Message-ID: <20260918060336.2740434-1-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, invoked from the error path in btintel_prepare_fw_download_tlv() 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 | 42 ++++++++++++++++++++++++++++++++++++- drivers/bluetooth/btintel.h | 9 ++++++++ 2 files changed, 50 insertions(+), 1 deletion(-) diff --git a/drivers/bluetooth/btintel.c b/drivers/bluetooth/btintel.c index 964d2de30e65..c78d507f4380 100644 --- a/drivers/bluetooth/btintel.c +++ b/drivers/bluetooth/btintel.c @@ -963,6 +963,40 @@ 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 command parameters 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) { @@ -2231,8 +2265,11 @@ static int btintel_download_fw(struct hci_dev *hdev, * of this device. */ err = btintel_download_wait(hdev, calltime, 5000); - if (err == -ETIMEDOUT) + if (err == -ETIMEDOUT) { + /* FW download timed out, collect rom debug info */ + btintel_get_rom_debug_info(hdev); btintel_reset_to_bootloader(hdev); + } done: release_firmware(fw); @@ -2465,6 +2502,9 @@ static int btintel_prepare_fw_download_tlv(struct hci_dev *hdev, goto done; } + /* FW download failed, collect rom debug info */ + btintel_get_rom_debug_info(hdev); + /* When FW download fails, send Intel Reset to retry * FW download. */ diff --git a/drivers/bluetooth/btintel.h b/drivers/bluetooth/btintel.h index c00f793d9dc8..dedda3e77487 100644 --- a/drivers/bluetooth/btintel.h +++ b/drivers/bluetooth/btintel.h @@ -178,6 +178,15 @@ 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