From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.20]) (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 103567478 for ; Sat, 26 Sep 2026 08:50:27 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.175.65.20 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790412630; cv=none; b=hfO6k3wjxJ3JSij1BSnEMzi0yvEv97yvRieF9z+BNnMABFJC/Sm0cAGIt821+0hMI9vOLrruUnXM/o1GVeF/DwTIVr5UgNhu/Ul3frnr+/21vbDIiCWyV928wVhfhElWLWMwG+5FiMKmwlWHQAr0AYvm8BWcdE58ADvRIe1eaYE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790412630; c=relaxed/simple; bh=oZil0vRLdVl+Orqq5d8PnMWTRJTHtrlz+ex7TNO2M4Q=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=YmfOVxO3uWsge9wio69lOaWRCoX32MUl5xKabz6w9k+SBO7HnxK2iV1zbF2eW1Mk8OlTxh+8d4lrZ+PfWiP627VhtMmKOXMJBZOqN3HiIEL8vEToKCxf8jPFg4HqEFQWd9pFZPKBEdOTuIDtUrQsXrMcpbseI9D8EqaUlJqd730= 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=Q87xSTbZ; arc=none smtp.client-ip=198.175.65.20 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="Q87xSTbZ" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1790412628; x=1821948628; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=oZil0vRLdVl+Orqq5d8PnMWTRJTHtrlz+ex7TNO2M4Q=; b=Q87xSTbZK0ajrAruhM0oNg3ZyG9H7L/C/SzYKyMsPwbbehltFuHGZRQM VuGXts9r+ewbvHcEt/OPNPmWUtKtl6JQNgLzow68yGVa7Jx+modiG5xaz qBCIDsIZTucRvi8hnwlYK+IQ06MMycSK1YAix71PwqHdYTvN2tOxrgTe6 TCBvsBUt0G/n14f6n5DqbExQ+7fULt/V27LZt1spVdpXphAGCtKBn5Yyt CIcCpEXh25IfzfYZXk1igLLE02DSFanapLHSYfMTNYDCClfv7Qc3BS2JN hz8wfHT5AP3auS659WULIp3kI+TWHciT/u5OJ7QUxlIfWm4w3ALH6Fgfu Q==; X-CSE-ConnectionGUID: y8Mx2TFITDGmX+h8QTLx6w== X-CSE-MsgGUID: we6sFy92SRSNwAE2p/AXkA== X-IronPort-AV: E=McAfee;i="6800,10657,11916"; a="89952803" X-IronPort-AV: E=Sophos;i="6.27,124,1787036400"; d="scan'208";a="89952803" Received: from fmviesa004.fm.intel.com ([10.60.135.144]) by orvoesa112.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 26 Sep 2026 01:50:27 -0700 X-CSE-ConnectionGUID: fFbDX0bGSxSKjMbaR/nWLg== X-CSE-MsgGUID: EnqWI6GrSKmOt+5XrRbI1A== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.27,124,1787036400"; d="scan'208";a="279264747" Received: from unknown (HELO WEBA2062.iind.intel.com) ([10.66.228.2]) by fmviesa004.fm.intel.com with ESMTP; 26 Sep 2026 01:50:25 -0700 From: Ravindra To: linux-bluetooth@vger.kernel.org, lsa.uz@pm.me, vladimirkondratyev2@gmail.com Cc: chethan.tumkur.narayan@intel.com, kiran.k@intel.com, Paul Menzel Subject: [PATCH v4 1/4] Bluetooth: btintel_pcie: fix stale cache in set_dxstate fallback check Date: Sat, 26 Sep 2026 14:22:59 +0530 Message-ID: <20260926085302.2879093-1-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 From: "Vladimir V. Kondratyev" btintel_pcie returns -16 (EBUSY) during suspend, causing the entire suspend operation to abort on Intel Lunar Lake hardware. The system immediately resumes after every suspend attempt: Bluetooth: hci0: Timeout (200 ms) on alive interrupt for D2 entry, retry count 0 Bluetooth: hci0: Timeout (200 ms) on alive interrupt for D2 entry, retry count 1 Bluetooth: hci0: Timeout (200 ms) on alive interrupt for D2 entry, retry count 2 btintel_pcie 0000:00:14.7: PM: pci_pm_suspend(): btintel_pcie_suspend [btintel_pcie] returns -16 btintel_pcie 0000:00:14.7: PM: dpm_run_callback(): pci_pm_suspend returns -16 btintel_pcie 0000:00:14.7: PM: failed to suspend async: error -16 PM: Some devices failed to suspend, or early wake event detected btintel_pcie_set_dxstate() falls back to checking the controller state via btintel_pcie_in_d3/d0() when the alive interrupt is missed. However, these helpers read boot_stage_cache, which is only updated by the interrupt handler. As such, if the interrupt was missed, the cache is stale and the fallback check always fails, exhausting all retries and returning -EBUSY, causing suspend to abort. The fix involves re-reading the hardware register before the fallback state check, consistent with btintel_pcie_resume(). Fixes: 88c6216a52ea ("Bluetooth: btintel_pcie: Suspend/Resume: Controller doorbell interrupt handling") Link: https://bugzilla.kernel.org/show_bug.cgi?id=221481 Link: https://lore.kernel.org/linux-bluetooth/20260830151550.44687-1-lsa.uz@pm.me/ Signed-off-by: Vladimir V. Kondratyev Tested-by: Sergey Lebedev Signed-off-by: Sergey Lebedev --- drivers/bluetooth/btintel_pcie.c | 8 +++++--- drivers/bluetooth/btintel_pcie.h | 1 + 2 files changed, 6 insertions(+), 3 deletions(-) diff --git a/drivers/bluetooth/btintel_pcie.c b/drivers/bluetooth/btintel_pcie.c index 59cf600014bb..677749903173 100644 --- a/drivers/bluetooth/btintel_pcie.c +++ b/drivers/bluetooth/btintel_pcie.c @@ -4222,10 +4222,12 @@ static int btintel_pcie_set_dxstate(struct btintel_pcie_data *data, u32 dxstate) BTINTEL_PCIE_CSR_MSIX_HW_INT_CAUSES, BTINTEL_PCIE_MSIX_HW_INT_CAUSES_GP0); - /* A hardware bug may cause the alive interrupt to be missed. - * Check if the controller reached the expected state and retry - * the operation only if it hasn't. + /* A hardware bug may cause the alive interrupt to be missed. Refresh + * boot_stage_cache from hardware, since only the interrupt handler + * updates it. Finally retry only if the state check still fails. */ + data->boot_stage_cache = btintel_pcie_rd_reg32(data, + BTINTEL_PCIE_CSR_BOOT_STAGE_REG); if (dxstate == BTINTEL_PCIE_STATE_D0) { if (btintel_pcie_in_d0(data)) return 0; diff --git a/drivers/bluetooth/btintel_pcie.h b/drivers/bluetooth/btintel_pcie.h index f35f80f800ed..016795fcbccc 100644 --- a/drivers/bluetooth/btintel_pcie.h +++ b/drivers/bluetooth/btintel_pcie.h @@ -51,6 +51,7 @@ #define BTINTEL_PCIE_CSR_BOOT_STAGE_DEVICE_HALTED (BIT(14)) #define BTINTEL_PCIE_CSR_BOOT_STAGE_MAC_ACCESS_ON (BIT(16)) #define BTINTEL_PCIE_CSR_BOOT_STAGE_ALIVE (BIT(23)) +/* Reflects live D-state. Updated by hardware on every D-state transition. */ #define BTINTEL_PCIE_CSR_BOOT_STAGE_D3_STATE_READY (BIT(24)) #define BTINTEL_PCIE_CSR_DOORBELL_MBOX_READ_CONFIRM (BIT(4)) -- 2.43.0