From nobody Sat Sep 26 07:15:39 2026 Received: from mail-wr1-f42.google.com (mail-wr1-f42.google.com [209.85.221.42]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id EEE694E13ED for ; Thu, 3 Sep 2026 15:35:49 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.221.42 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788449751; cv=none; b=ZVbt2frME/Kw4muCchq6iQje3P4SPQtfy/KOaKbCnN6EtrRMEWgeMsI3FFhQE1DpaAsw1FXGADaKDo796ucQaRnu2akmBuPysOnfqhuDe5ElWqPbnCYya/gp+71wnJ6qZ+tf2UcLzZIDl5HLE/JynS7Iv5uNKYJ40+LUPSjUcOU= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788449751; c=relaxed/simple; bh=ncJ1Z5b6dglmAecDwCPhVPH1ci0n4/A+38nkG7EOi9Y=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=glMsHqgHtkyQTSaZiQyZ1gPw0lwkVwjSj4e7GW/C2qXmKGClic8SjSz9l5I1K6gXwMtOP2WxtlAD7jmnE44IZxzQ9QqAt8HRFw4lUftpU4F41QBVLyDyJwmnYJk6LUHSs2IZU20J90xTn6Dvn49TYX0xB7FRR7ajV+5nxuJ4dfg= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=c1sYT3NS; arc=none smtp.client-ip=209.85.221.42 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="c1sYT3NS" Received: by mail-wr1-f42.google.com with SMTP id ffacd0b85a97d-4858303de5dso699849f8f.2 for ; Thu, 03 Sep 2026 08:35:49 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1788449748; x=1789054548; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to:content-type; bh=BGqHkfnL74zaEtf/qjlyesNnXLKu3K97Vw4CNhC1tbM=; b=c1sYT3NSOrd6uouEtxSaM/q33egHhjFF9rlE99qGWPH10WBuo1kJxyi5v2qe+CwJRG StT2k8kew//q9C3OUIYYUE2cqnum218EYw0vCP+F03OxOHkSr/jadCZfnDCMk/SGEtXs 5Tr6ITEfVLxpuRfSauN1O/gvrSmmNiaiB0XgaAWu67u1LRtJPd6WXqon1GEb/ng9PcGa f0dI4LaXAyNnIh8Uej/KJ60YAdiRqy6ni3HrHk6bB9Xqz5GOopx+0WXXioEYA34Uepe2 ABFLSn9NnWMrWaYvq8xkGLP00zSTAjCpk6lLc+0PULLi6NCbB8Pyiv8YcJyUoIuXoyok Yj3Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1788449748; x=1789054548; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-gg:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to:content-type; bh=BGqHkfnL74zaEtf/qjlyesNnXLKu3K97Vw4CNhC1tbM=; b=JB5r01QgKcm0oiIIFP6gNK4gwn+knTTd6zfKhmVLVRPYtERg3CO8ZlQNZrFdZ3a4uL ZUxo1vsv/QA8Oyrlj0XKcTwhgBOm4pZfAL/6yW1YqOrdcMR2J2rhq03BbzYXMOwubPkJ 2exdbCyskjPcdO/fQhkr8aR8S3YB+KEWr0wU6LQE49MK9LpnXVBm4pxcFnVO4kPCRgfM NncdXpxTqh5lbANLBYD7MMnEbnW1TIAJuCmf5aX/t8c2Wah3qrg9g2uCo9gcRFFzVEsk VzWfCPZQmrecDapmH8WDM73JGLCioQYrEtjQENX7gRrMh1pzfyrK4VgOYnaBEtw2bYtO wU0g== X-Forwarded-Encrypted: i=1; AKwUvBzYmriZSZwTgxPxCNdk0cPlAWzBbWib12LNuA1/rEl3rXRVix0x0WuQwpOkWd7HEpT0GRQSUwvaaWfsESc=@vger.kernel.org X-Gm-Message-State: AFuF++mRVIpbeA0R3gsKz/eca9QCfk8AFpNebg+RF7rmHlcMYWGFUHDO busE1SrEJQ9KKzIeBbBkemlHm0oQ2E3WhLMwpP32n1lIeRKiU23S4eLLnSuw7/2SGQ4= X-Gm-Gg: AYBFou35jSs/N+tLpkIPYeC8hzOUGzehCso6VqRfx5YxXPjJ8Stq4iW7d+5jW9tQ2N1 QzRCtLDat24QxtGHOfyQrbLNRo3p9OXBeSxgKhNCwR98W3GExt3+pevq3y8+Ag0AdcP/kY31S1M zYDam8Sp9H1TvipoCb34/suy3Ag3XsoZoN5bpxEFHHS3lY5B7uYSE/bxyBI8yFZfwIMZ/46wbzK 0tiVAyfuZ9FMVWzCDPTnLTealICucuiw7gXyATaN8unOzgznS5++4nyrKIecPnieHpTSaNWp32D Z0d89bDS1ZHHUIOZ5JRs1WHXgDvGxQx+OvF/xDGrBTJHAVgzEwtaODcAjTnvLoRdX75taX45aTD CjJthB0/B2COIH+kuCe+dd4Oa+QcB591xjXCUnnD9qay1XBFn8nNNk0vECuyL55lZ8KDYXPkYjT 9FiOGTW1JDVlKjJzX+do7B+/hS5nHHutB5kU+AaFvCqNM7lKuhW4vQFJ3RpV423fDglO5wD6qhU E5axC/fRcOEAZp4OSlGr7VUykwwX5KWRRFZMuSPRHN9GXWychE0jpW1YATnoAkO5cjD44rujY4i Ec07Q0HkIuGR X-Received: by 2002:adf:e947:0:b0:484:f26c:ba9a with SMTP id ffacd0b85a97d-4858606d6a3mr2102493f8f.16.1788449747700; Thu, 03 Sep 2026 08:35:47 -0700 (PDT) Received: from cdev ([2a00:fbc:f1cb:c56f:5a2a:db32:f638:bd69]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-48448eea5b4sm14851108f8f.27.2026.09.03.08.35.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 03 Sep 2026 08:35:46 -0700 (PDT) From: "Vladimir V. Kondratyev" To: marcel@holtmann.org, luiz.dentz@gmail.com, pmenzel@molgen.mpg.de, chandrashekar.devegowda@intel.com, arnd@arndb.de, kiran.k@intel.com, linux-bluetooth@vger.kernel.org, linux-kernel@vger.kernel.org, lsa.uz@pm.me Cc: "Vladimir V. Kondratyev" Subject: [PATCH v3] Bluetooth: btintel_pcie: fix stale cache in set_dxstate fallback check Date: Thu, 3 Sep 2026 17:35:04 +0200 Message-ID: <20260903153521.130258-2-vladimirkondratyev2@gmail.com> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260507203426.128975-1-vladimirkondratyev2@gmail.com> References: <20260507203426.128975-1-vladimirkondratyev2@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" btintel_pcie returns -16 (EBUSY) during suspend, causing the entire suspend operation to abort on Intel Lunar Lake hardware. The system immediately res= umes 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 [bt= intel_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: e57362f4911b ("Bluetooth: btintel_pcie: Add support for _suspend() /= _resume()") Link: https://bugzilla.kernel.org/show_bug.cgi?id=3D221481 Link: https://lore.kernel.org/linux-bluetooth/20260830151550.44687-1-lsa.uz= @pm.me/ Signed-off-by: Vladimir V. Kondratyev Tested-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_p= cie.c index 30923eaabed7..44ad31a5d7ed 100644 --- a/drivers/bluetooth/btintel_pcie.c +++ b/drivers/bluetooth/btintel_pcie.c @@ -3538,10 +3538,12 @@ 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); =20 - /* 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 =3D btintel_pcie_rd_reg32(data, + BTINTEL_PCIE_CSR_BOOT_STAGE_REG); if (dxstate =3D=3D BTINTEL_PCIE_STATE_D0) { if (btintel_pcie_in_d0(data)) return 0; diff --git a/drivers/bluetooth/btintel_pcie.h b/drivers/bluetooth/btintel_p= cie.h index 9baa214d9bbe..a7f4e590af5e 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)) =20 #define BTINTEL_PCIE_CSR_DOORBELL_MBOX_READ_CONFIRM (BIT(4)) --=20 2.55.0