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Thu, 16 Jul 2026 01:31:46 -0700 (PDT) Received: from google.com ([2a00:79e0:201d:8:8cee:ac9c:232c:cca3]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-38e39e5f713sm923742a91.14.2026.07.16.01.31.43 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 16 Jul 2026 01:31:46 -0700 (PDT) Date: Thu, 16 Jul 2026 16:31:41 +0800 From: Chen-Yu Tsai To: Loic Poulain Cc: Manivannan Sadhasivam , Bartosz Golaszewski , Marcel Holtmann , Luiz Augusto von Dentz , Bjorn Andersson , Konrad Dybcio , Rob Herring , Krzysztof Kozlowski , Conor Dooley , linux-pci@vger.kernel.org, linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-bluetooth@vger.kernel.org, devicetree@vger.kernel.org, Manivannan Sadhasivam Subject: Re: [PATCH v3 08/11] Bluetooth: hci_qca: Support QCA2066 on M.2 connector via pwrseq Message-ID: <20260716083141.GA4101439@google.com> References: <20260710-monza-wireless-v3-0-46253587af64@oss.qualcomm.com> <20260710-monza-wireless-v3-8-46253587af64@oss.qualcomm.com> Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260710-monza-wireless-v3-8-46253587af64@oss.qualcomm.com> On Fri, Jul 10, 2026 at 11:57:34AM +0200, Loic Poulain wrote: > For QCA2066 (and other QCA chips) on M.2 connectors, the UART enable is > controlled by the W_DISABLE2# signal managed by the pcie-m2 power sequencer > rather than a dedicated BT enable GPIO. > > When the serdev controller has an OF graph (indicating it is connected to > an M.2 connector), acquire the 'uart' pwrseq target from the connector's > power sequencer and use it to control BT power instead of the bt-enable > GPIO. This is factored out into qca_serdev_get_m2_pwrseq(). > > Reviewed-by: Manivannan Sadhasivam > Signed-off-by: Loic Poulain > --- > drivers/bluetooth/hci_qca.c | 35 ++++++++++++++++++++++++----------- > 1 file changed, 24 insertions(+), 11 deletions(-) > > diff --git a/drivers/bluetooth/hci_qca.c b/drivers/bluetooth/hci_qca.c > index 24dc5bf6d192be7e1d500df6bdf36e6184f9eaf7..f6529d359ffbd97f8a3c4c0593680ab200215b36 100644 > --- a/drivers/bluetooth/hci_qca.c > +++ b/drivers/bluetooth/hci_qca.c > @@ -1872,6 +1872,9 @@ static int qca_power_on(struct hci_dev *hdev) > /* Controller needs time to bootup. */ > msleep(150); > } > + > + if (qcadev->bt_power.pwrseq) > + pwrseq_power_on(qcadev->bt_power.pwrseq); > } > > clear_bit(QCA_BT_OFF, &qca->flags); > @@ -2387,6 +2390,20 @@ static int qca_init_regulators(struct qca_power *qca, > return 0; > } > > +static int qca_serdev_get_m2_pwrseq(struct qca_serdev *qcadev) > +{ > + struct serdev_device *serdev = qcadev->serdev_hu.serdev; > + > + if (!of_graph_is_present(dev_of_node(&serdev->ctrl->dev))) > + return 0; > + > + qcadev->bt_power.pwrseq = devm_pwrseq_get(&serdev->ctrl->dev, "uart"); Note that this ultimately ties the lifecycle of the returned pwrseq descriptor to the uart, which is probably not what you want. I ended up manually doing pwrseq_get() with devm_add_action_or_reset() so that the descriptor is released when the serdev driver is unbound. This was for the Realtek driver. I haven't sent patches yet. > + if (IS_ERR(qcadev->bt_power.pwrseq)) > + return PTR_ERR(qcadev->bt_power.pwrseq); > + > + return 0; > +} > + > static int qca_serdev_probe(struct serdev_device *serdev) > { > struct qca_serdev *qcadev; > @@ -2417,6 +2434,10 @@ static int qca_serdev_probe(struct serdev_device *serdev) > else > qcadev->btsoc_type = QCA_ROME; > > + err = qca_serdev_get_m2_pwrseq(qcadev); > + if (err) > + return err; > + > switch (qcadev->btsoc_type) { > case QCA_WCN3950: > case QCA_WCN3988: > @@ -2426,17 +2447,9 @@ static int qca_serdev_probe(struct serdev_device *serdev) > case QCA_WCN6750: > case QCA_WCN6855: > case QCA_WCN7850: > - /* > - * OF graph link is only present for BT devices attached through > - * the M.2 Key E connector. > - */ > - if (of_graph_is_present(dev_of_node(&serdev->ctrl->dev))) { > - qcadev->bt_power.pwrseq = devm_pwrseq_get(&serdev->ctrl->dev, > - "uart"); It's already incorrect here. But I think the original patch that introduces this hasn't landed? ChenYu > - if (IS_ERR(qcadev->bt_power.pwrseq)) > - return PTR_ERR(qcadev->bt_power.pwrseq); > + /* M.2 connector modules are powered by the pwrseq acquired above. */ > + if (qcadev->bt_power.pwrseq) > break; > - } > > if (!device_property_present(&serdev->dev, "enable-gpios")) { > /* > @@ -2528,7 +2541,7 @@ static int qca_serdev_probe(struct serdev_device *serdev) > return PTR_ERR(qcadev->susclk); > } > } > - > + > if (qcadev->bt_power.pwrseq) { > bt_en_available = pwrseq_power_is_controllable(qcadev->bt_power.pwrseq); > if (!bt_en_available) { > > -- > 2.34.1 >