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Mon, 16 Dec 2024 11:05:23 +0100 (CET) Received: from euls16034.sgp.st.com (euls16034.sgp.st.com [10.75.44.20]) by beta.dmz-ap.st.com (STMicroelectronics) with ESMTP id 61FE540046; Mon, 16 Dec 2024 11:03:58 +0100 (CET) Received: from Webmail-eu.st.com (shfdag1node3.st.com [10.75.129.71]) by euls16034.sgp.st.com (STMicroelectronics) with ESMTP id AF45826AD7C; Mon, 16 Dec 2024 11:02:09 +0100 (CET) Received: from [10.129.178.212] (10.129.178.212) by SHFDAG1NODE3.st.com (10.75.129.71) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.37; Mon, 16 Dec 2024 11:02:08 +0100 Message-ID: <4e257489-4d90-4e47-a4d9-a2444627c356@foss.st.com> Date: Mon, 16 Dec 2024 11:02:07 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 4/5] PCI: stm32: Add PCIe endpoint support for STM32MP25 To: Manivannan Sadhasivam CC: , , , , , , , , , , , , , , , , References: <20241126155119.1574564-1-christian.bruel@foss.st.com> <20241126155119.1574564-5-christian.bruel@foss.st.com> <20241203152230.5mdrt27u5u5ecwcz@thinkpad> Content-Language: en-US From: Christian Bruel In-Reply-To: <20241203152230.5mdrt27u5u5ecwcz@thinkpad> Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 7bit X-Originating-IP: [10.129.178.212] X-ClientProxiedBy: SHFCAS1NODE2.st.com (10.75.129.73) To SHFDAG1NODE3.st.com (10.75.129.71) 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-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20241216_020554_752722_A85A7276 X-CRM114-Status: GOOD ( 19.42 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi Manivanna, On 12/3/24 16:22, Manivannan Sadhasivam wrote: > On Tue, Nov 26, 2024 at 04:51:18PM +0100, Christian Bruel wrote: > > [...] > >> +static int stm32_pcie_start_link(struct dw_pcie *pci) >> +{ >> + struct stm32_pcie *stm32_pcie = to_stm32_pcie(pci); >> + int ret; >> + >> + if (stm32_pcie->link_status == STM32_PCIE_EP_LINK_ENABLED) { >> + dev_dbg(pci->dev, "Link is already enabled\n"); >> + return 0; >> + } >> + >> + ret = stm32_pcie_enable_link(pci); >> + if (ret) { >> + dev_err(pci->dev, "PCIe cannot establish link: %d\n", ret); >> + return ret; >> + } > > How the REFCLK is supplied to the endpoint? From host or generated locally? From Host only, we don't support the separated clock model. > >> + >> + stm32_pcie->link_status = STM32_PCIE_EP_LINK_ENABLED; >> + >> + enable_irq(stm32_pcie->perst_irq); >> + >> + return 0; >> +} >> + >> +static void stm32_pcie_stop_link(struct dw_pcie *pci) >> +{ >> + struct stm32_pcie *stm32_pcie = to_stm32_pcie(pci); >> + >> + if (stm32_pcie->link_status == STM32_PCIE_EP_LINK_DISABLED) { >> + dev_dbg(pci->dev, "Link is already disabled\n"); >> + return; >> + } >> + >> + disable_irq(stm32_pcie->perst_irq); >> + >> + stm32_pcie_disable_link(pci); >> + >> + stm32_pcie->link_status = STM32_PCIE_EP_LINK_DISABLED; >> +} >> + >> +static int stm32_pcie_raise_irq(struct dw_pcie_ep *ep, u8 func_no, >> + unsigned int type, u16 interrupt_num) >> +{ >> + struct dw_pcie *pci = to_dw_pcie_from_ep(ep); >> + >> + switch (type) { >> + case PCI_IRQ_INTX: >> + return dw_pcie_ep_raise_intx_irq(ep, func_no); >> + case PCI_IRQ_MSI: >> + return dw_pcie_ep_raise_msi_irq(ep, func_no, interrupt_num); >> + default: >> + dev_err(pci->dev, "UNKNOWN IRQ type\n"); >> + return -EINVAL; >> + } >> +} >> + >> +static const struct pci_epc_features stm32_pcie_epc_features = { >> + .msi_capable = true, >> + .align = 1 << 16, > > Use SZ_64K > OK >> +}; >> + > > [...] > >> +static int stm32_add_pcie_ep(struct stm32_pcie *stm32_pcie, >> + struct platform_device *pdev) >> +{ >> + struct dw_pcie *pci = stm32_pcie->pci; >> + struct dw_pcie_ep *ep = &pci->ep; >> + struct device *dev = &pdev->dev; >> + int ret; >> + >> + ret = regmap_update_bits(stm32_pcie->regmap, SYSCFG_PCIECR, >> + STM32MP25_PCIECR_TYPE_MASK, >> + STM32MP25_PCIECR_EP); >> + if (ret) >> + return ret; >> + >> + ret = pm_runtime_resume_and_get(dev); >> + if (ret < 0) { >> + dev_err(dev, "pm runtime resume failed: %d\n", ret); >> + return ret; >> + } > > You might want to do runtime resume before accessing regmap. OK >> + >> + reset_control_assert(stm32_pcie->rst); >> + reset_control_deassert(stm32_pcie->rst); >> + >> + ep->ops = &stm32_pcie_ep_ops; >> + >> + ret = dw_pcie_ep_init(ep); >> + if (ret) { >> + dev_err(dev, "failed to initialize ep: %d\n", ret); >> + goto err_init; >> + } >> + >> + ret = stm32_pcie_enable_resources(stm32_pcie); >> + if (ret) { >> + dev_err(dev, "failed to enable resources: %d\n", ret); >> + goto err_clk; >> + } >> + >> + ret = dw_pcie_ep_init_registers(ep); >> + if (ret) { >> + dev_err(dev, "Failed to initialize DWC endpoint registers\n"); >> + goto err_init_regs; >> + } >> + >> + pci_epc_init_notify(ep->epc); >> + >> + return 0; >> + >> +err_init_regs: >> + stm32_pcie_disable_resources(stm32_pcie); >> + >> +err_clk: >> + dw_pcie_ep_deinit(ep); >> + >> +err_init: >> + pm_runtime_put_sync(dev); >> + return ret; >> +} >> + >> +static int stm32_pcie_probe(struct platform_device *pdev) >> +{ >> + struct stm32_pcie *stm32_pcie; >> + struct dw_pcie *dw; >> + struct device *dev = &pdev->dev; >> + int ret; >> + >> + stm32_pcie = devm_kzalloc(dev, sizeof(*stm32_pcie), GFP_KERNEL); >> + if (!stm32_pcie) >> + return -ENOMEM; >> + >> + dw = devm_kzalloc(dev, sizeof(*dw), GFP_KERNEL); >> + if (!dw) >> + return -ENOMEM; > > Why can't you allocate it statically inside 'struct stm32_pcie'? Will do > >> + >> + stm32_pcie->pci = dw; >> + >> + dw->dev = dev; >> + dw->ops = &dw_pcie_ops; >> + >> + stm32_pcie->regmap = syscon_regmap_lookup_by_compatible("st,stm32mp25-syscfg"); >> + if (IS_ERR(stm32_pcie->regmap)) >> + return dev_err_probe(dev, PTR_ERR(stm32_pcie->regmap), >> + "No syscfg specified\n"); >> + >> + stm32_pcie->phy = devm_phy_get(dev, "pcie-phy"); >> + if (IS_ERR(stm32_pcie->phy)) >> + return dev_err_probe(dev, PTR_ERR(stm32_pcie->phy), >> + "failed to get pcie-phy\n"); >> + >> + stm32_pcie->clk = devm_clk_get(dev, NULL); >> + if (IS_ERR(stm32_pcie->clk)) >> + return dev_err_probe(dev, PTR_ERR(stm32_pcie->clk), >> + "Failed to get PCIe clock source\n"); >> + >> + stm32_pcie->rst = devm_reset_control_get_exclusive(dev, NULL); >> + if (IS_ERR(stm32_pcie->rst)) >> + return dev_err_probe(dev, PTR_ERR(stm32_pcie->rst), >> + "Failed to get PCIe reset\n"); >> + >> + stm32_pcie->perst_gpio = devm_gpiod_get(dev, "reset", GPIOD_IN); >> + if (IS_ERR(stm32_pcie->perst_gpio)) >> + return dev_err_probe(dev, PTR_ERR(stm32_pcie->perst_gpio), >> + "Failed to get reset GPIO\n"); >> + >> + ret = phy_set_mode(stm32_pcie->phy, PHY_MODE_PCIE); > > Hmm, so PHY mode is common for both endpoint and host? Yes it is. We need to init the phy here because it is a clock source for the PCIe core clk Thanks Christian > > - Mani >