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Thu, 12 Sep 2024 13:39:54 +0000 (GMT) Received: from nasanex01b.na.qualcomm.com (nasanex01b.na.qualcomm.com [10.46.141.250]) by NASANPPMTA04.qualcomm.com (8.18.1.2/8.18.1.2) with ESMTPS id 48CDdrI3028430 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 12 Sep 2024 13:39:53 GMT Received: from [10.253.13.69] (10.80.80.8) by nasanex01b.na.qualcomm.com (10.46.141.250) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.9; Thu, 12 Sep 2024 06:39:48 -0700 Message-ID: <9222ef18-2eef-4ba3-95aa-fae540c06925@quicinc.com> Date: Thu, 12 Sep 2024 21:39:44 +0800 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 8/8] PCI: qcom: Add support to PCIe slot power supplies To: Manivannan Sadhasivam CC: Dmitry Baryshkov , , , , , , , , , , , , , , , , , , , , , References: <20240827063631.3932971-1-quic_qianyu@quicinc.com> <20240827063631.3932971-9-quic_qianyu@quicinc.com> <20240827165826.moe6cnemeheos6jn@thinkpad> <26f2845f-2e29-4887-9f33-0b5b2a06adb6@quicinc.com> <20240911153228.7ajcqicxnu2afhbp@thinkpad> Content-Language: en-US From: Qiang Yu In-Reply-To: <20240911153228.7ajcqicxnu2afhbp@thinkpad> X-Originating-IP: [10.80.80.8] X-ClientProxiedBy: nasanex01b.na.qualcomm.com (10.46.141.250) To nasanex01b.na.qualcomm.com (10.46.141.250) X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-ORIG-GUID: NLJRrRe3U1E6MJVZB1ufqd-FX3yRHmOp X-Proofpoint-GUID: NLJRrRe3U1E6MJVZB1ufqd-FX3yRHmOp X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1039,Hydra:6.0.680,FMLib:17.12.60.29 definitions=2024-09-06_09,2024-09-06_01,2024-09-02_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 adultscore=0 clxscore=1015 phishscore=0 mlxlogscore=999 lowpriorityscore=0 suspectscore=0 mlxscore=0 priorityscore=1501 malwarescore=0 bulkscore=0 impostorscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2408220000 definitions=main-2409120099 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240912_064001_767561_FED00699 X-CRM114-Status: GOOD ( 24.39 ) X-BeenThere: linux-phy@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Linux Phy Mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: "linux-phy" Errors-To: linux-phy-bounces+linux-phy=archiver.kernel.org@lists.infradead.org On 9/11/2024 11:32 PM, Manivannan Sadhasivam wrote: > On Wed, Sep 11, 2024 at 04:17:41PM +0800, Qiang Yu wrote: >> On 8/28/2024 12:58 AM, Manivannan Sadhasivam wrote: >>> On Tue, Aug 27, 2024 at 02:44:09PM +0300, Dmitry Baryshkov wrote: >>>> On Tue, 27 Aug 2024 at 09:36, Qiang Yu wrote: >>>>> On platform x1e80100 QCP, PCIe3 is a standard x8 form factor. Hence, add >>>>> support to use 3.3v, 3.3v aux and 12v regulators. >>>> First of all, I don't see corresponding bindings change. >>>> >>>> Second, these supplies power up the slot, not the host controller >>>> itself. As such these supplies do not belong to the host controller >>>> entry. Please consider using the pwrseq framework instead. >>>> >>> Indeed. For legacy reasons, slot power supplies were populated in the host >>> bridge node itself until recently Rob started objecting it [1]. And it makes >>> real sense to put these supplies in the root port node and handle them in the >>> relevant driver. >>> >>> I'm still evaluating whether the handling should be done in the portdrv or >>> pwrctl driver, but haven't reached the conclusion. Pwrctl seems to be the ideal >>> choice, but I see a few issues related to handling the OF node for the root >>> port. >>> >>> Hope I'll come to a conclusion in the next few days and will update this thread. >>> >>> - Mani >>> >>> [1] https://lore.kernel.org/lkml/20240604235806.GA1903493-robh@kernel.org/ >> Hi Mani, do you have any updates? >> > I'm working with Bartosz to add a new pwrctl driver for rootports. And we are > debugging an issue currently. Unfortunately, the progress is very slow as I'm on > vacation still. > > Will post the patches once it got resolved. > > - Mani OK, thanks for your update. Thanks, Qiang >> Thanks, >> Qiang >>>>> Signed-off-by: Qiang Yu >>>>> --- >>>>> drivers/pci/controller/dwc/pcie-qcom.c | 52 +++++++++++++++++++++++++- >>>>> 1 file changed, 50 insertions(+), 2 deletions(-) >>>>> >>>>> diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c >>>>> index 6f953e32d990..59fb415dfeeb 100644 >>>>> --- a/drivers/pci/controller/dwc/pcie-qcom.c >>>>> +++ b/drivers/pci/controller/dwc/pcie-qcom.c >>>>> @@ -248,6 +248,8 @@ struct qcom_pcie_cfg { >>>>> bool no_l0s; >>>>> }; >>>>> >>>>> +#define QCOM_PCIE_SLOT_MAX_SUPPLIES 3 >>>>> + >>>>> struct qcom_pcie { >>>>> struct dw_pcie *pci; >>>>> void __iomem *parf; /* DT parf */ >>>>> @@ -260,6 +262,7 @@ struct qcom_pcie { >>>>> struct icc_path *icc_cpu; >>>>> const struct qcom_pcie_cfg *cfg; >>>>> struct dentry *debugfs; >>>>> + struct regulator_bulk_data slot_supplies[QCOM_PCIE_SLOT_MAX_SUPPLIES]; >>>>> bool suspended; >>>>> bool use_pm_opp; >>>>> }; >>>>> @@ -1174,6 +1177,41 @@ static int qcom_pcie_link_up(struct dw_pcie *pci) >>>>> return !!(val & PCI_EXP_LNKSTA_DLLLA); >>>>> } >>>>> >>>>> +static int qcom_pcie_enable_slot_supplies(struct qcom_pcie *pcie) >>>>> +{ >>>>> + struct dw_pcie *pci = pcie->pci; >>>>> + int ret; >>>>> + >>>>> + ret = regulator_bulk_enable(ARRAY_SIZE(pcie->slot_supplies), >>>>> + pcie->slot_supplies); >>>>> + if (ret < 0) >>>>> + dev_err(pci->dev, "Failed to enable slot regulators\n"); >>>>> + >>>>> + return ret; >>>>> +} >>>>> + >>>>> +static void qcom_pcie_disable_slot_supplies(struct qcom_pcie *pcie) >>>>> +{ >>>>> + regulator_bulk_disable(ARRAY_SIZE(pcie->slot_supplies), >>>>> + pcie->slot_supplies); >>>>> +} >>>>> + >>>>> +static int qcom_pcie_get_slot_supplies(struct qcom_pcie *pcie) >>>>> +{ >>>>> + struct dw_pcie *pci = pcie->pci; >>>>> + int ret; >>>>> + >>>>> + pcie->slot_supplies[0].supply = "vpcie12v"; >>>>> + pcie->slot_supplies[1].supply = "vpcie3v3"; >>>>> + pcie->slot_supplies[2].supply = "vpcie3v3aux"; >>>>> + ret = devm_regulator_bulk_get(pci->dev, ARRAY_SIZE(pcie->slot_supplies), >>>>> + pcie->slot_supplies); >>>>> + if (ret < 0) >>>>> + dev_err(pci->dev, "Failed to get slot regulators\n"); >>>>> + >>>>> + return ret; >>>>> +} >>>>> + >>>>> static int qcom_pcie_host_init(struct dw_pcie_rp *pp) >>>>> { >>>>> struct dw_pcie *pci = to_dw_pcie_from_pp(pp); >>>>> @@ -1182,10 +1220,14 @@ static int qcom_pcie_host_init(struct dw_pcie_rp *pp) >>>>> >>>>> qcom_ep_reset_assert(pcie); >>>>> >>>>> - ret = pcie->cfg->ops->init(pcie); >>>>> + ret = qcom_pcie_enable_slot_supplies(pcie); >>>>> if (ret) >>>>> return ret; >>>>> >>>>> + ret = pcie->cfg->ops->init(pcie); >>>>> + if (ret) >>>>> + goto err_disable_slot; >>>>> + >>>>> ret = phy_set_mode_ext(pcie->phy, PHY_MODE_PCIE, PHY_MODE_PCIE_RC); >>>>> if (ret) >>>>> goto err_deinit; >>>>> @@ -1216,7 +1258,8 @@ static int qcom_pcie_host_init(struct dw_pcie_rp *pp) >>>>> phy_power_off(pcie->phy); >>>>> err_deinit: >>>>> pcie->cfg->ops->deinit(pcie); >>>>> - >>>>> +err_disable_slot: >>>>> + qcom_pcie_disable_slot_supplies(pcie); >>>>> return ret; >>>>> } >>>>> >>>>> @@ -1228,6 +1271,7 @@ static void qcom_pcie_host_deinit(struct dw_pcie_rp *pp) >>>>> qcom_ep_reset_assert(pcie); >>>>> phy_power_off(pcie->phy); >>>>> pcie->cfg->ops->deinit(pcie); >>>>> + qcom_pcie_disable_slot_supplies(pcie); >>>>> } >>>>> >>>>> static void qcom_pcie_host_post_init(struct dw_pcie_rp *pp) >>>>> @@ -1602,6 +1646,10 @@ static int qcom_pcie_probe(struct platform_device *pdev) >>>>> goto err_pm_runtime_put; >>>>> } >>>>> >>>>> + ret = qcom_pcie_get_slot_supplies(pcie); >>>>> + if (ret) >>>>> + goto err_pm_runtime_put; >>>>> + >>>>> ret = pcie->cfg->ops->get_resources(pcie); >>>>> if (ret) >>>>> goto err_pm_runtime_put; >>>>> -- >>>>> 2.34.1 >>>>> >>>> -- >>>> With best wishes >>>> Dmitry -- linux-phy mailing list linux-phy@lists.infradead.org https://lists.infradead.org/mailman/listinfo/linux-phy