Date:   Tue, 13 Aug 2019 17:06:07 +0530
From:   Vidya Sagar <vidyas@...dia.com>
To:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>
CC:     <bhelgaas@...gle.com>, <robh+dt@...nel.org>,
        <mark.rutland@....com>, <thierry.reding@...il.com>,
        <jonathanh@...dia.com>, <kishon@...com>, <catalin.marinas@....com>,
        <will.deacon@....com>, <jingoohan1@...il.com>,
        <gustavo.pimentel@...opsys.com>, <digetx@...il.com>,
        <mperttunen@...dia.com>, <linux-pci@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-tegra@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <kthota@...dia.com>,
        <mmaddireddy@...dia.com>, <sagar.tv@...il.com>
Subject: Re: [PATCH V15 13/13] PCI: tegra: Add Tegra194 PCIe support

On 8/13/2019 4:27 PM, Lorenzo Pieralisi wrote:
> Some style comments - we have time to fix them.
> 
> On Fri, Aug 09, 2019 at 10:16:09AM +0530, Vidya Sagar wrote:
> 
> [...]
> 
> I do not know why up to here the line spacing is OK and here
> you started cramming code all together :)
> 
> Just a matter of consistency, thanks for fixing them up.

Thanks for the review.
I'll address all these comments in the next series.

Thanks,
Vidya Sagar
> 
>> +static void tegra_pcie_downstream_dev_to_D0(struct tegra_pcie_dw *pcie)
>> +{
>> +	struct pcie_port *pp = &pcie->pci.pp;
>> +	struct pci_bus *child;
>> +	struct pci_dev *pdev;
>> +
>> +	/*
>> +	 * link doesn't go into L2 state with some of the endpoints with Tegra
>> +	 * if they are not in D0 state. So, need to make sure that immediate
>> +	 * downstream devices are in D0 state before sending PME_TurnOff to put
>> +	 * link into L2 state.
>> +	 * This is as per PCI Express Base r4.0 v1.0 September 27-2017,
>> +	 * 5.2 Link State Power Management (Page #428).
>> +	 */
>> +
>> +	list_for_each_entry(child, &pp->root_bus->children, node) {
>> +		/* Bring downstream devices to D0 if they are not already in */
>> +		if (child->parent == pp->root_bus)
>> +			break;
>> +	}
> 
> Add empty line.
> 
>> +	list_for_each_entry(pdev, &child->devices, bus_list) {
>> +		if (PCI_SLOT(pdev->devfn) == 0) {
>> +			if (pci_set_power_state(pdev, PCI_D0))
>> +				dev_err(pcie->dev,
>> +					"Failed to transition %s to D0 state\n",
>> +					dev_name(&pdev->dev));
>> +		}
>> +	}
>> +}
>> +
>> +static int tegra_pcie_config_controller(struct tegra_pcie_dw *pcie,
>> +					bool en_hw_hot_rst)
>> +{
>> +	int ret;
>> +	u32 val;
>> +
>> +	ret = tegra_pcie_bpmp_set_ctrl_state(pcie, true);
>> +	if (ret) {
>> +		dev_err(pcie->dev,
>> +			"Failed to enable controller %u: %d\n", pcie->cid, ret);
>> +		return ret;
>> +	}
>> +
>> +	ret = regulator_enable(pcie->pex_ctl_supply);
>> +	if (ret < 0) {
>> +		dev_err(pcie->dev, "Failed to enable regulator: %d\n", ret);
>> +		goto fail_reg_en;
>> +	}
>> +
>> +	ret = clk_prepare_enable(pcie->core_clk);
>> +	if (ret) {
>> +		dev_err(pcie->dev, "Failed to enable core clock: %d\n", ret);
>> +		goto fail_core_clk;
>> +	}
>> +
>> +	ret = reset_control_deassert(pcie->core_apb_rst);
>> +	if (ret) {
>> +		dev_err(pcie->dev, "Failed to deassert core APB reset: %d\n",
>> +			ret);
>> +		goto fail_core_apb_rst;
>> +	}
>> +
>> +	if (en_hw_hot_rst) {
>> +		/* Enable HW_HOT_RST mode */
>> +		val = appl_readl(pcie, APPL_CTRL);
>> +		val &= ~(APPL_CTRL_HW_HOT_RST_MODE_MASK <<
>> +			 APPL_CTRL_HW_HOT_RST_MODE_SHIFT);
>> +		val |= APPL_CTRL_HW_HOT_RST_EN;
>> +		appl_writel(pcie, val, APPL_CTRL);
>> +	}
>> +
>> +	ret = tegra_pcie_enable_phy(pcie);
>> +	if (ret) {
>> +		dev_err(pcie->dev, "Failed to enable PHY: %d\n", ret);
>> +		goto fail_phy;
>> +	}
>> +
>> +	/* Update CFG base address */
>> +	appl_writel(pcie, pcie->dbi_res->start & APPL_CFG_BASE_ADDR_MASK,
>> +		    APPL_CFG_BASE_ADDR);
>> +
>> +	/* Configure this core for RP mode operation */
>> +	appl_writel(pcie, APPL_DM_TYPE_RP, APPL_DM_TYPE);
>> +
>> +	appl_writel(pcie, 0x0, APPL_CFG_SLCG_OVERRIDE);
>> +
>> +	val = appl_readl(pcie, APPL_CTRL);
>> +	appl_writel(pcie, val | APPL_CTRL_SYS_PRE_DET_STATE, APPL_CTRL);
>> +
>> +	val = appl_readl(pcie, APPL_CFG_MISC);
>> +	val |= (APPL_CFG_MISC_ARCACHE_VAL << APPL_CFG_MISC_ARCACHE_SHIFT);
>> +	appl_writel(pcie, val, APPL_CFG_MISC);
>> +
>> +	if (!pcie->supports_clkreq) {
>> +		val = appl_readl(pcie, APPL_PINMUX);
>> +		val |= APPL_PINMUX_CLKREQ_OUT_OVRD_EN;
>> +		val |= APPL_PINMUX_CLKREQ_OUT_OVRD;
>> +		appl_writel(pcie, val, APPL_PINMUX);
>> +	}
>> +
>> +	/* Update iATU_DMA base address */
>> +	appl_writel(pcie,
>> +		    pcie->atu_dma_res->start & APPL_CFG_IATU_DMA_BASE_ADDR_MASK,
>> +		    APPL_CFG_IATU_DMA_BASE_ADDR);
>> +
>> +	reset_control_deassert(pcie->core_rst);
>> +
>> +	pcie->pcie_cap_base = dw_pcie_find_capability(&pcie->pci,
>> +						      PCI_CAP_ID_EXP);
>> +
>> +	/* Disable ASPM-L1SS advertisement as there is no CLKREQ routing */
>> +	if (!pcie->supports_clkreq) {
>> +		disable_aspm_l11(pcie);
>> +		disable_aspm_l12(pcie);
>> +	}
>> +
>> +	return ret;
>> +
>> +fail_phy:
>> +	reset_control_assert(pcie->core_apb_rst);
>> +fail_core_apb_rst:
>> +	clk_disable_unprepare(pcie->core_clk);
>> +fail_core_clk:
>> +	regulator_disable(pcie->pex_ctl_supply);
>> +fail_reg_en:
>> +	tegra_pcie_bpmp_set_ctrl_state(pcie, false);
>> +
>> +	return ret;
>> +}
>> +
>> +static int __deinit_controller(struct tegra_pcie_dw *pcie)
>> +{
>> +	int ret;
>> +
>> +	ret = reset_control_assert(pcie->core_rst);
>> +	if (ret) {
>> +		dev_err(pcie->dev, "Failed to assert \"core\" reset: %d\n",
>> +			ret);
>> +		return ret;
>> +	}
> 
> Add empty line.
> 
>> +	tegra_pcie_disable_phy(pcie);
> 
> Add empty line.
> 
>> +	ret = reset_control_assert(pcie->core_apb_rst);
>> +	if (ret) {
>> +		dev_err(pcie->dev, "Failed to assert APB reset: %d\n", ret);
>> +		return ret;
>> +	}
> 
> Add empty line.
> 
>> +	clk_disable_unprepare(pcie->core_clk);
> 
> Add empty line.
> 
>> +	ret = regulator_disable(pcie->pex_ctl_supply);
>> +	if (ret) {
>> +		dev_err(pcie->dev, "Failed to disable regulator: %d\n", ret);
>> +		return ret;
>> +	}
> 
> Add empty line.
> 
>> +	ret = tegra_pcie_bpmp_set_ctrl_state(pcie, false);
>> +	if (ret) {
>> +		dev_err(pcie->dev, "Failed to disable controller %d: %d\n",
>> +			pcie->cid, ret);
>> +		return ret;
>> +	}
> 
> Add empty line.
> 
>> +	return ret;
>> +}
>> +
>> +static int tegra_pcie_init_controller(struct tegra_pcie_dw *pcie)
>> +{
>> +	struct dw_pcie *pci = &pcie->pci;
>> +	struct pcie_port *pp = &pci->pp;
>> +	int ret;
>> +
>> +	ret = tegra_pcie_config_controller(pcie, false);
>> +	if (ret < 0)
>> +		return ret;
>> +
>> +	pp->ops = &tegra_pcie_dw_host_ops;
>> +
>> +	ret = dw_pcie_host_init(pp);
>> +	if (ret < 0) {
>> +		dev_err(pcie->dev, "Failed to add PCIe port: %d\n", ret);
>> +		goto fail_host_init;
>> +	}
>> +
>> +	return 0;
>> +
>> +fail_host_init:
>> +	return __deinit_controller(pcie);
>> +}
>> +
>> +static int tegra_pcie_try_link_l2(struct tegra_pcie_dw *pcie)
>> +{
>> +	u32 val;
>> +
>> +	if (!tegra_pcie_dw_link_up(&pcie->pci))
>> +		return 0;
>> +
>> +	val = appl_readl(pcie, APPL_RADM_STATUS);
>> +	val |= APPL_PM_XMT_TURNOFF_STATE;
>> +	appl_writel(pcie, val, APPL_RADM_STATUS);
>> +
>> +	return readl_poll_timeout_atomic(pcie->appl_base + APPL_DEBUG, val,
>> +				 val & APPL_DEBUG_PM_LINKST_IN_L2_LAT,
>> +				 1, PME_ACK_TIMEOUT);
>> +}
>> +
>> +static void tegra_pcie_dw_pme_turnoff(struct tegra_pcie_dw *pcie)
>> +{
>> +	u32 data;
>> +	int err;
>> +
>> +	if (!tegra_pcie_dw_link_up(&pcie->pci)) {
>> +		dev_dbg(pcie->dev, "PCIe link is not up...!\n");
>> +		return;
>> +	}
>> +
>> +	if (tegra_pcie_try_link_l2(pcie)) {
>> +		dev_info(pcie->dev, "Link didn't transition to L2 state\n");
>> +		/*
>> +		 * TX lane clock freq will reset to Gen1 only if link is in L2
>> +		 * or detect state.
>> +		 * So apply pex_rst to end point to force RP to go into detect
>> +		 * state
>> +		 */
>> +		data = appl_readl(pcie, APPL_PINMUX);
>> +		data &= ~APPL_PINMUX_PEX_RST;
>> +		appl_writel(pcie, data, APPL_PINMUX);
>> +
>> +		err = readl_poll_timeout_atomic(pcie->appl_base + APPL_DEBUG,
>> +						data,
>> +						((data &
>> +						APPL_DEBUG_LTSSM_STATE_MASK) >>
>> +						APPL_DEBUG_LTSSM_STATE_SHIFT) ==
>> +						LTSSM_STATE_PRE_DETECT,
>> +						1, LTSSM_TIMEOUT);
>> +		if (err) {
>> +			dev_info(pcie->dev, "Link didn't go to detect state\n");
>> +		} else {
>> +			/* Disable LTSSM after link is in detect state */
>> +			data = appl_readl(pcie, APPL_CTRL);
>> +			data &= ~APPL_CTRL_LTSSM_EN;
>> +			appl_writel(pcie, data, APPL_CTRL);
>> +		}
>> +	}
>> +	/*
>> +	 * DBI registers may not be accessible after this as PLL-E would be
>> +	 * down depending on how CLKREQ is pulled by end point
>> +	 */
>> +	data = appl_readl(pcie, APPL_PINMUX);
>> +	data |= (APPL_PINMUX_CLKREQ_OVERRIDE_EN | APPL_PINMUX_CLKREQ_OVERRIDE);
>> +	/* Cut REFCLK to slot */
>> +	data |= APPL_PINMUX_CLK_OUTPUT_IN_OVERRIDE_EN;
>> +	data &= ~APPL_PINMUX_CLK_OUTPUT_IN_OVERRIDE;
>> +	appl_writel(pcie, data, APPL_PINMUX);
>> +}
>> +
>> +static int tegra_pcie_deinit_controller(struct tegra_pcie_dw *pcie)
>> +{
>> +	tegra_pcie_downstream_dev_to_D0(pcie);
>> +	dw_pcie_host_deinit(&pcie->pci.pp);
>> +	tegra_pcie_dw_pme_turnoff(pcie);
> 
> Add empty line.
> 
>> +	return __deinit_controller(pcie);
>> +}
>> +
>> +static int tegra_pcie_config_rp(struct tegra_pcie_dw *pcie)
>> +{
>> +	struct pcie_port *pp = &pcie->pci.pp;
>> +	struct device *dev = pcie->dev;
>> +	char *name;
>> +	int ret;
>> +
>> +	if (IS_ENABLED(CONFIG_PCI_MSI)) {
>> +		pp->msi_irq = of_irq_get_byname(dev->of_node, "msi");
>> +		if (!pp->msi_irq) {
>> +			dev_err(dev, "Failed to get MSI interrupt\n");
>> +			return -ENODEV;
>> +		}
>> +	}
>> +
>> +	pm_runtime_enable(dev);
>> +	ret = pm_runtime_get_sync(dev);
>> +	if (ret < 0) {
>> +		dev_err(dev, "Failed to get runtime sync for PCIe dev: %d\n",
>> +			ret);
>> +		pm_runtime_disable(dev);
>> +		return ret;
>> +	}
>> +
>> +	tegra_pcie_init_controller(pcie);
>> +
>> +	pcie->link_state = tegra_pcie_dw_link_up(&pcie->pci);
>> +
>> +	if (!pcie->link_state) {
>> +		ret = -ENOMEDIUM;
>> +		goto fail_host_init;
>> +	}
>> +
>> +	name = devm_kasprintf(dev, GFP_KERNEL, "%pOFP", dev->of_node);
>> +	if (!name) {
>> +		ret = -ENOMEM;
>> +		goto fail_host_init;
>> +	}
>> +
>> +	pcie->debugfs = debugfs_create_dir(name, NULL);
>> +	if (!pcie->debugfs)
>> +		dev_err(dev, "Failed to create debugfs\n");
>> +	else
>> +		init_debugfs(pcie);
>> +
>> +	return ret;
>> +
>> +fail_host_init:
>> +	tegra_pcie_deinit_controller(pcie);
>> +	pm_runtime_put_sync(dev);
>> +	pm_runtime_disable(dev);
>> +	return ret;
>> +}
>> +
>> +static int tegra_pcie_dw_probe(struct platform_device *pdev)
>> +{
>> +	struct device *dev = &pdev->dev;
>> +	struct resource *atu_dma_res;
>> +	struct tegra_pcie_dw *pcie;
>> +	struct resource *dbi_res;
>> +	struct pcie_port *pp;
>> +	struct dw_pcie *pci;
>> +	struct phy **phys;
>> +	char *name;
>> +	int ret;
>> +	u32 i;
>> +
>> +	pcie = devm_kzalloc(dev, sizeof(*pcie), GFP_KERNEL);
>> +	if (!pcie)
>> +		return -ENOMEM;
>> +
>> +	pci = &pcie->pci;
>> +	pci->dev = &pdev->dev;
>> +	pci->ops = &tegra_dw_pcie_ops;
>> +	pp = &pci->pp;
>> +	pcie->dev = &pdev->dev;
>> +
>> +	ret = tegra_pcie_dw_parse_dt(pcie);
>> +	if (ret < 0) {
>> +		dev_err(dev, "Failed to parse device tree: %d\n", ret);
>> +		return ret;
>> +	}
>> +
>> +	pcie->pex_ctl_supply = devm_regulator_get(dev, "vddio-pex-ctl");
>> +	if (IS_ERR(pcie->pex_ctl_supply)) {
>> +		dev_err(dev, "Failed to get regulator: %ld\n",
>> +			PTR_ERR(pcie->pex_ctl_supply));
>> +		return PTR_ERR(pcie->pex_ctl_supply);
>> +	}
>> +
>> +	pcie->core_clk = devm_clk_get(dev, "core");
>> +	if (IS_ERR(pcie->core_clk)) {
>> +		dev_err(dev, "Failed to get core clock: %ld\n",
>> +			PTR_ERR(pcie->core_clk));
>> +		return PTR_ERR(pcie->core_clk);
>> +	}
>> +
>> +	pcie->appl_res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
>> +						      "appl");
>> +	if (!pcie->appl_res) {
>> +		dev_err(dev, "Failed to find \"appl\" region\n");
>> +		return PTR_ERR(pcie->appl_res);
>> +	}
>> +
>> +	pcie->appl_base = devm_ioremap_resource(dev, pcie->appl_res);
>> +	if (IS_ERR(pcie->appl_base))
>> +		return PTR_ERR(pcie->appl_base);
>> +
>> +	pcie->core_apb_rst = devm_reset_control_get(dev, "apb");
>> +	if (IS_ERR(pcie->core_apb_rst)) {
>> +		dev_err(dev, "Failed to get APB reset: %ld\n",
>> +			PTR_ERR(pcie->core_apb_rst));
>> +		return PTR_ERR(pcie->core_apb_rst);
>> +	}
>> +
>> +	phys = devm_kcalloc(dev, pcie->phy_count, sizeof(*phys), GFP_KERNEL);
>> +	if (!phys)
>> +		return PTR_ERR(phys);
>> +
>> +	for (i = 0; i < pcie->phy_count; i++) {
>> +		name = kasprintf(GFP_KERNEL, "p2u-%u", i);
>> +		if (!name) {
>> +			dev_err(dev, "Failed to create P2U string\n");
>> +			return -ENOMEM;
>> +		}
>> +		phys[i] = devm_phy_get(dev, name);
>> +		kfree(name);
>> +		if (IS_ERR(phys[i])) {
>> +			ret = PTR_ERR(phys[i]);
>> +			dev_err(dev, "Failed to get PHY: %d\n", ret);
>> +			return ret;
>> +		}
>> +	}
>> +
>> +	pcie->phys = phys;
>> +
>> +	dbi_res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dbi");
>> +	if (!dbi_res) {
>> +		dev_err(dev, "Failed to find \"dbi\" region\n");
>> +		return PTR_ERR(dbi_res);
>> +	}
>> +	pcie->dbi_res = dbi_res;
>> +
>> +	pci->dbi_base = devm_ioremap_resource(dev, dbi_res);
>> +	if (IS_ERR(pci->dbi_base))
>> +		return PTR_ERR(pci->dbi_base);
>> +
>> +	/* Tegra HW locates DBI2 at a fixed offset from DBI */
>> +	pci->dbi_base2 = pci->dbi_base + 0x1000;
>> +
>> +	atu_dma_res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
>> +						   "atu_dma");
>> +	if (!atu_dma_res) {
>> +		dev_err(dev, "Failed to find \"atu_dma\" region\n");
>> +		return PTR_ERR(atu_dma_res);
>> +	}
>> +	pcie->atu_dma_res = atu_dma_res;
>> +
>> +	pci->atu_base = devm_ioremap_resource(dev, atu_dma_res);
>> +	if (IS_ERR(pci->atu_base))
>> +		return PTR_ERR(pci->atu_base);
>> +
>> +	pcie->core_rst = devm_reset_control_get(dev, "core");
>> +	if (IS_ERR(pcie->core_rst)) {
>> +		dev_err(dev, "Failed to get core reset: %ld\n",
>> +			PTR_ERR(pcie->core_rst));
>> +		return PTR_ERR(pcie->core_rst);
>> +	}
>> +
>> +	pp->irq = platform_get_irq_byname(pdev, "intr");
>> +	if (!pp->irq) {
>> +		dev_err(dev, "Failed to get \"intr\" interrupt\n");
>> +		return -ENODEV;
>> +	}
>> +
>> +	ret = devm_request_irq(dev, pp->irq, tegra_pcie_irq_handler,
>> +			       IRQF_SHARED, "tegra-pcie-intr", pcie);
>> +	if (ret) {
>> +		dev_err(dev, "Failed to request IRQ %d: %d\n", pp->irq, ret);
>> +		return ret;
>> +	}
>> +
>> +	pcie->bpmp = tegra_bpmp_get(dev);
>> +	if (IS_ERR(pcie->bpmp))
>> +		return PTR_ERR(pcie->bpmp);
>> +
>> +	platform_set_drvdata(pdev, pcie);
>> +
>> +	ret = tegra_pcie_config_rp(pcie);
>> +	if (ret && ret != -ENOMEDIUM)
>> +		goto fail;
>> +	else
>> +		return 0;
>> +
>> +fail:
>> +	tegra_bpmp_put(pcie->bpmp);
>> +	return ret;
>> +}
>> +
>> +static int tegra_pcie_dw_remove(struct platform_device *pdev)
>> +{
>> +	struct tegra_pcie_dw *pcie = platform_get_drvdata(pdev);
>> +
>> +	if (!pcie->link_state)
>> +		return 0;
>> +
>> +	debugfs_remove_recursive(pcie->debugfs);
>> +	tegra_pcie_deinit_controller(pcie);
>> +	pm_runtime_put_sync(pcie->dev);
>> +	pm_runtime_disable(pcie->dev);
>> +	tegra_bpmp_put(pcie->bpmp);
>> +
>> +	return 0;
>> +}
>> +
>> +static int tegra_pcie_dw_suspend_late(struct device *dev)
>> +{
>> +	struct tegra_pcie_dw *pcie = dev_get_drvdata(dev);
>> +	u32 val;
>> +
>> +	if (!pcie->link_state)
>> +		return 0;
>> +
>> +	/* Enable HW_HOT_RST mode */
>> +	val = appl_readl(pcie, APPL_CTRL);
>> +	val &= ~(APPL_CTRL_HW_HOT_RST_MODE_MASK <<
>> +		 APPL_CTRL_HW_HOT_RST_MODE_SHIFT);
>> +	val |= APPL_CTRL_HW_HOT_RST_EN;
>> +	appl_writel(pcie, val, APPL_CTRL);
>> +
>> +	return 0;
>> +}
>> +
>> +static int tegra_pcie_dw_suspend_noirq(struct device *dev)
>> +{
>> +	struct tegra_pcie_dw *pcie = dev_get_drvdata(dev);
>> +
>> +	if (!pcie->link_state)
>> +		return 0;
>> +
>> +	/* Save MSI interrupt vector */
>> +	pcie->msi_ctrl_int = dw_pcie_readl_dbi(&pcie->pci,
>> +					       PORT_LOGIC_MSI_CTRL_INT_0_EN);
>> +	tegra_pcie_downstream_dev_to_D0(pcie);
>> +	tegra_pcie_dw_pme_turnoff(pcie);
> 
> Add empty line.
> 
>> +	return __deinit_controller(pcie);
>> +}
>> +
>> +static int tegra_pcie_dw_resume_noirq(struct device *dev)
>> +{
>> +	struct tegra_pcie_dw *pcie = dev_get_drvdata(dev);
>> +	int ret;
>> +
>> +	if (!pcie->link_state)
>> +		return 0;
>> +
>> +	ret = tegra_pcie_config_controller(pcie, true);
>> +	if (ret < 0)
>> +		return ret;
>> +
>> +	ret = tegra_pcie_dw_host_init(&pcie->pci.pp);
>> +	if (ret < 0) {
>> +		dev_err(dev, "Failed to init host: %d\n", ret);
>> +		goto fail_host_init;
>> +	}
>> +
>> +	/* Restore MSI interrupt vector */
>> +	dw_pcie_writel_dbi(&pcie->pci, PORT_LOGIC_MSI_CTRL_INT_0_EN,
>> +			   pcie->msi_ctrl_int);
>> +
>> +	return 0;
> 
> Add empty line.
> 
> Thanks,
> Lorenzo
> 
>> +fail_host_init:
>> +	return __deinit_controller(pcie);
>> +}
>> +
>> +static int tegra_pcie_dw_resume_early(struct device *dev)
>> +{
>> +	struct tegra_pcie_dw *pcie = dev_get_drvdata(dev);
>> +	u32 val;
>> +
>> +	if (!pcie->link_state)
>> +		return 0;
>> +
>> +	/* Disable HW_HOT_RST mode */
>> +	val = appl_readl(pcie, APPL_CTRL);
>> +	val &= ~(APPL_CTRL_HW_HOT_RST_MODE_MASK <<
>> +		 APPL_CTRL_HW_HOT_RST_MODE_SHIFT);
>> +	val |= APPL_CTRL_HW_HOT_RST_MODE_IMDT_RST <<
>> +	       APPL_CTRL_HW_HOT_RST_MODE_SHIFT;
>> +	val &= ~APPL_CTRL_HW_HOT_RST_EN;
>> +	appl_writel(pcie, val, APPL_CTRL);
>> +
>> +	return 0;
>> +}
>> +
>> +static void tegra_pcie_dw_shutdown(struct platform_device *pdev)
>> +{
>> +	struct tegra_pcie_dw *pcie = platform_get_drvdata(pdev);
>> +
>> +	if (!pcie->link_state)
>> +		return;
>> +
>> +	debugfs_remove_recursive(pcie->debugfs);
>> +	tegra_pcie_downstream_dev_to_D0(pcie);
>> +
>> +	disable_irq(pcie->pci.pp.irq);
>> +	if (IS_ENABLED(CONFIG_PCI_MSI))
>> +		disable_irq(pcie->pci.pp.msi_irq);
>> +
>> +	tegra_pcie_dw_pme_turnoff(pcie);
>> +	__deinit_controller(pcie);
>> +}
>> +
>> +static const struct of_device_id tegra_pcie_dw_of_match[] = {
>> +	{
>> +		.compatible = "nvidia,tegra194-pcie",
>> +	},
>> +	{},
>> +};
>> +
>> +static const struct dev_pm_ops tegra_pcie_dw_pm_ops = {
>> +	.suspend_late = tegra_pcie_dw_suspend_late,
>> +	.suspend_noirq = tegra_pcie_dw_suspend_noirq,
>> +	.resume_noirq = tegra_pcie_dw_resume_noirq,
>> +	.resume_early = tegra_pcie_dw_resume_early,
>> +};
>> +
>> +static struct platform_driver tegra_pcie_dw_driver = {
>> +	.probe = tegra_pcie_dw_probe,
>> +	.remove = tegra_pcie_dw_remove,
>> +	.shutdown = tegra_pcie_dw_shutdown,
>> +	.driver = {
>> +		.name	= "tegra194-pcie",
>> +		.pm = &tegra_pcie_dw_pm_ops,
>> +		.of_match_table = tegra_pcie_dw_of_match,
>> +	},
>> +};
>> +module_platform_driver(tegra_pcie_dw_driver);
>> +
>> +MODULE_DEVICE_TABLE(of, tegra_pcie_dw_of_match);
>> +
>> +MODULE_AUTHOR("Vidya Sagar <vidyas@...dia.com>");
>> +MODULE_DESCRIPTION("NVIDIA PCIe host controller driver");
>> +MODULE_LICENSE("GPL v2");
>> -- 
>> 2.17.1
>>

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