Linux v5.2.0

1 files changed, 1002 insertions, 0 deletions

diff --git a/arm64-qcom-DWC3-USB-Add-support-for-ACPI-based-AArch64-Laptops.patch b/arm64-qcom-DWC3-USB-Add-support-for-ACPI-based-AArch64-Laptops.patch
new file mode 100644
index 000000000..ece8d7af4
--- /dev/null
+++ b/arm64-qcom-DWC3-USB-Add-support-for-ACPI-based-AArch64-Laptops.patch
@@ -0,0 +1,1002 @@
+From patchwork Mon Jun 17 12:51:02 2019
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+ Mon, 17 Jun 2019 05:51:09 -0700 (PDT)
+From: Lee Jones <lee.jones@linaro.org>
+To: alokc@codeaurora.org, agross@kernel.org, david.brown@linaro.org,
+ bjorn.andersson@linaro.org, balbi@kernel.org, gregkh@linuxfoundation.org,
+ ard.biesheuvel@linaro.org, jlhugo@gmail.com, linux-arm-msm@vger.kernel.org,
+ linux-usb@vger.kernel.org, felipe.balbi@linux.intel.com
+Subject: [RESEND v4 1/4] soc: qcom: geni: Add support for ACPI
+Date: Mon, 17 Jun 2019 13:51:02 +0100
+Message-Id: <20190617125105.6186-2-lee.jones@linaro.org>
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+When booting with ACPI as the active set of configuration tables,
+all; clocks, regulators, pin functions ect are expected to be at
+their ideal values/levels/rates, thus the associated frameworks
+are unavailable.  Ensure calls to these APIs are shielded when
+ACPI is enabled.
+
+Signed-off-by: Lee Jones <lee.jones@linaro.org>
+Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
+---
+ drivers/soc/qcom/qcom-geni-se.c | 21 +++++++++++++++------
+ 1 file changed, 15 insertions(+), 6 deletions(-)
+
+diff --git a/drivers/soc/qcom/qcom-geni-se.c b/drivers/soc/qcom/qcom-geni-se.c
+index 6b8ef01472e9..d5cf953b4337 100644
+--- a/drivers/soc/qcom/qcom-geni-se.c
++++ b/drivers/soc/qcom/qcom-geni-se.c
+@@ -1,6 +1,7 @@
+ // SPDX-License-Identifier: GPL-2.0
+ // Copyright (c) 2017-2018, The Linux Foundation. All rights reserved.
+ 
++#include <linux/acpi.h>
+ #include <linux/clk.h>
+ #include <linux/slab.h>
+ #include <linux/dma-mapping.h>
+@@ -450,6 +451,9 @@ int geni_se_resources_off(struct geni_se *se)
+ {
+ 	int ret;
+ 
++	if (has_acpi_companion(se->dev))
++		return 0;
++
+ 	ret = pinctrl_pm_select_sleep_state(se->dev);
+ 	if (ret)
+ 		return ret;
+@@ -487,6 +491,9 @@ int geni_se_resources_on(struct geni_se *se)
+ {
+ 	int ret;
+ 
++	if (has_acpi_companion(se->dev))
++		return 0;
++
+ 	ret = geni_se_clks_on(se);
+ 	if (ret)
+ 		return ret;
+@@ -724,12 +731,14 @@ static int geni_se_probe(struct platform_device *pdev)
+ 	if (IS_ERR(wrapper->base))
+ 		return PTR_ERR(wrapper->base);
+ 
+-	wrapper->ahb_clks[0].id = "m-ahb";
+-	wrapper->ahb_clks[1].id = "s-ahb";
+-	ret = devm_clk_bulk_get(dev, NUM_AHB_CLKS, wrapper->ahb_clks);
+-	if (ret) {
+-		dev_err(dev, "Err getting AHB clks %d\n", ret);
+-		return ret;
++	if (!has_acpi_companion(&pdev->dev)) {
++		wrapper->ahb_clks[0].id = "m-ahb";
++		wrapper->ahb_clks[1].id = "s-ahb";
++		ret = devm_clk_bulk_get(dev, NUM_AHB_CLKS, wrapper->ahb_clks);
++		if (ret) {
++			dev_err(dev, "Err getting AHB clks %d\n", ret);
++			return ret;
++		}
+ 	}
+ 
+ 	dev_set_drvdata(dev, wrapper);
+
+From patchwork Mon Jun 17 12:51:03 2019
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+ Mon, 17 Jun 2019 05:51:10 -0700 (PDT)
+From: Lee Jones <lee.jones@linaro.org>
+To: alokc@codeaurora.org, agross@kernel.org, david.brown@linaro.org,
+ bjorn.andersson@linaro.org, balbi@kernel.org, gregkh@linuxfoundation.org,
+ ard.biesheuvel@linaro.org, jlhugo@gmail.com, linux-arm-msm@vger.kernel.org,
+ linux-usb@vger.kernel.org, felipe.balbi@linux.intel.com
+Subject: [RESEND v4 2/4] usb: dwc3: qcom: Add support for booting with ACPI
+Date: Mon, 17 Jun 2019 13:51:03 +0100
+Message-Id: <20190617125105.6186-3-lee.jones@linaro.org>
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+
+In Linux, the DWC3 core exists as its own independent platform device.
+Thus when describing relationships in Device Tree, the current default
+boot configuration table option, the DWC3 core often resides as a child
+of the platform specific node.  Both of which are given their own
+address space descriptions and the drivers can be mostly agnostic to
+each other.
+
+However, other Operating Systems have taken a more monolithic approach,
+which is evident in the configuration ACPI tables for the Qualcomm
+Snapdragon SDM850, where all DWC3 (core and platform) components are
+described under a single IO memory region.
+
+To ensure successful booting using the supplied ACPI tables, we need to
+devise a way to chop up the address regions provided and subsequently
+register the DWC3 core with the resultant information, which is
+precisely what this patch aims to achieve.
+
+Signed-off-by: Lee Jones <lee.jones@linaro.org>
+Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
+---
+ drivers/usb/dwc3/Kconfig     |   2 +-
+ drivers/usb/dwc3/dwc3-qcom.c | 206 ++++++++++++++++++++++++++++++-----
+ 2 files changed, 179 insertions(+), 29 deletions(-)
+
+diff --git a/drivers/usb/dwc3/Kconfig b/drivers/usb/dwc3/Kconfig
+index 4a62045cc812..89abc6078703 100644
+--- a/drivers/usb/dwc3/Kconfig
++++ b/drivers/usb/dwc3/Kconfig
+@@ -128,7 +128,7 @@ config USB_DWC3_QCOM
+ 	tristate "Qualcomm Platform"
+ 	depends on ARCH_QCOM || COMPILE_TEST
+ 	depends on EXTCON || !EXTCON
+-	depends on OF
++	depends on (OF || ACPI)
+ 	default USB_DWC3
+ 	help
+ 	  Some Qualcomm SoCs use DesignWare Core IP for USB2/3
+diff --git a/drivers/usb/dwc3/dwc3-qcom.c b/drivers/usb/dwc3/dwc3-qcom.c
+index 184df4daa590..0cb63f6c92d9 100644
+--- a/drivers/usb/dwc3/dwc3-qcom.c
++++ b/drivers/usb/dwc3/dwc3-qcom.c
+@@ -4,6 +4,7 @@
+  * Inspired by dwc3-of-simple.c
+  */
+ 
++#include <linux/acpi.h>
+ #include <linux/io.h>
+ #include <linux/of.h>
+ #include <linux/clk.h>
+@@ -38,6 +39,20 @@
+ #define PWR_EVNT_LPM_IN_L2_MASK			BIT(4)
+ #define PWR_EVNT_LPM_OUT_L2_MASK		BIT(5)
+ 
++#define SDM845_QSCRATCH_BASE_OFFSET		0xf8800
++#define SDM845_QSCRATCH_SIZE			0x400
++#define SDM845_DWC3_CORE_SIZE			0xcd00
++
++struct dwc3_acpi_pdata {
++	u32			qscratch_base_offset;
++	u32			qscratch_base_size;
++	u32			dwc3_core_base_size;
++	int			hs_phy_irq_index;
++	int			dp_hs_phy_irq_index;
++	int			dm_hs_phy_irq_index;
++	int			ss_phy_irq_index;
++};
++
+ struct dwc3_qcom {
+ 	struct device		*dev;
+ 	void __iomem		*qscratch_base;
+@@ -56,6 +71,8 @@ struct dwc3_qcom {
+ 	struct notifier_block	vbus_nb;
+ 	struct notifier_block	host_nb;
+ 
++	const struct dwc3_acpi_pdata *acpi_pdata;
++
+ 	enum usb_dr_mode	mode;
+ 	bool			is_suspended;
+ 	bool			pm_suspended;
+@@ -300,12 +317,27 @@ static void dwc3_qcom_select_utmi_clk(struct dwc3_qcom *qcom)
+ 			  PIPE_UTMI_CLK_DIS);
+ }
+ 
++static int dwc3_qcom_get_irq(struct platform_device *pdev,
++			     const char *name, int num)
++{
++	struct device_node *np = pdev->dev.of_node;
++	int ret;
++
++	if (np)
++		ret = platform_get_irq_byname(pdev, name);
++	else
++		ret = platform_get_irq(pdev, num);
++
++	return ret;
++}
++
+ static int dwc3_qcom_setup_irq(struct platform_device *pdev)
+ {
+ 	struct dwc3_qcom *qcom = platform_get_drvdata(pdev);
++	const struct dwc3_acpi_pdata *pdata = qcom->acpi_pdata;
+ 	int irq, ret;
+-
+-	irq = platform_get_irq_byname(pdev, "hs_phy_irq");
++	irq = dwc3_qcom_get_irq(pdev, "hs_phy_irq",
++				pdata ? pdata->hs_phy_irq_index : -1);
+ 	if (irq > 0) {
+ 		/* Keep wakeup interrupts disabled until suspend */
+ 		irq_set_status_flags(irq, IRQ_NOAUTOEN);
+@@ -320,7 +352,8 @@ static int dwc3_qcom_setup_irq(struct platform_device *pdev)
+ 		qcom->hs_phy_irq = irq;
+ 	}
+ 
+-	irq = platform_get_irq_byname(pdev, "dp_hs_phy_irq");
++	irq = dwc3_qcom_get_irq(pdev, "dp_hs_phy_irq",
++				pdata ? pdata->dp_hs_phy_irq_index : -1);
+ 	if (irq > 0) {
+ 		irq_set_status_flags(irq, IRQ_NOAUTOEN);
+ 		ret = devm_request_threaded_irq(qcom->dev, irq, NULL,
+@@ -334,7 +367,8 @@ static int dwc3_qcom_setup_irq(struct platform_device *pdev)
+ 		qcom->dp_hs_phy_irq = irq;
+ 	}
+ 
+-	irq = platform_get_irq_byname(pdev, "dm_hs_phy_irq");
++	irq = dwc3_qcom_get_irq(pdev, "dm_hs_phy_irq",
++				pdata ? pdata->dm_hs_phy_irq_index : -1);
+ 	if (irq > 0) {
+ 		irq_set_status_flags(irq, IRQ_NOAUTOEN);
+ 		ret = devm_request_threaded_irq(qcom->dev, irq, NULL,
+@@ -348,7 +382,8 @@ static int dwc3_qcom_setup_irq(struct platform_device *pdev)
+ 		qcom->dm_hs_phy_irq = irq;
+ 	}
+ 
+-	irq = platform_get_irq_byname(pdev, "ss_phy_irq");
++	irq = dwc3_qcom_get_irq(pdev, "ss_phy_irq",
++				pdata ? pdata->ss_phy_irq_index : -1);
+ 	if (irq > 0) {
+ 		irq_set_status_flags(irq, IRQ_NOAUTOEN);
+ 		ret = devm_request_threaded_irq(qcom->dev, irq, NULL,
+@@ -371,11 +406,11 @@ static int dwc3_qcom_clk_init(struct dwc3_qcom *qcom, int count)
+ 	struct device_node	*np = dev->of_node;
+ 	int			i;
+ 
+-	qcom->num_clocks = count;
+-
+-	if (!count)
++	if (!np || !count)
+ 		return 0;
+ 
++	qcom->num_clocks = count;
++
+ 	qcom->clks = devm_kcalloc(dev, qcom->num_clocks,
+ 				  sizeof(struct clk *), GFP_KERNEL);
+ 	if (!qcom->clks)
+@@ -409,12 +444,103 @@ static int dwc3_qcom_clk_init(struct dwc3_qcom *qcom, int count)
+ 	return 0;
+ }
+ 
+-static int dwc3_qcom_probe(struct platform_device *pdev)
++static int dwc3_qcom_acpi_register_core(struct platform_device *pdev)
+ {
++	struct dwc3_qcom 	*qcom = platform_get_drvdata(pdev);
++	struct device		*dev = &pdev->dev;
++	struct resource		*res, *child_res = NULL;
++	int			irq;
++	int			ret;
++
++	qcom->dwc3 = platform_device_alloc("dwc3", PLATFORM_DEVID_AUTO);
++	if (!qcom->dwc3)
++		return -ENOMEM;
++
++	qcom->dwc3->dev.parent = dev;
++	qcom->dwc3->dev.type = dev->type;
++	qcom->dwc3->dev.dma_mask = dev->dma_mask;
++	qcom->dwc3->dev.dma_parms = dev->dma_parms;
++	qcom->dwc3->dev.coherent_dma_mask = dev->coherent_dma_mask;
++
++	child_res = kcalloc(2, sizeof(*child_res), GFP_KERNEL);
++	if (!child_res)
++		return -ENOMEM;
++
++	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
++	if (!res) {
++		dev_err(&pdev->dev, "failed to get memory resource\n");
++		ret = -ENODEV;
++		goto out;
++	}
++
++	child_res[0].flags = res->flags;
++	child_res[0].start = res->start;
++	child_res[0].end = child_res[0].start +
++		qcom->acpi_pdata->dwc3_core_base_size;
++
++	irq = platform_get_irq(pdev, 0);
++	child_res[1].flags = IORESOURCE_IRQ;
++	child_res[1].start = child_res[1].end = irq;
++
++	ret = platform_device_add_resources(qcom->dwc3, child_res, 2);
++	if (ret) {
++		dev_err(&pdev->dev, "failed to add resources\n");
++		goto out;
++	}
++
++	ret = platform_device_add(qcom->dwc3);
++	if (ret)
++		dev_err(&pdev->dev, "failed to add device\n");
++
++out:
++	kfree(child_res);
++	return ret;
++}
++
++static int dwc3_qcom_of_register_core(struct platform_device *pdev)
++{
++	struct dwc3_qcom 	*qcom = platform_get_drvdata(pdev);
+ 	struct device_node	*np = pdev->dev.of_node, *dwc3_np;
+ 	struct device		*dev = &pdev->dev;
++	int			ret;
++
++	dwc3_np = of_get_child_by_name(np, "dwc3");
++	if (!dwc3_np) {
++		dev_err(dev, "failed to find dwc3 core child\n");
++		return -ENODEV;
++	}
++
++	ret = of_platform_populate(np, NULL, NULL, dev);
++	if (ret) {
++		dev_err(dev, "failed to register dwc3 core - %d\n", ret);
++		return ret;
++	}
++
++	qcom->dwc3 = of_find_device_by_node(dwc3_np);
++	if (!qcom->dwc3) {
++		dev_err(dev, "failed to get dwc3 platform device\n");
++		return -ENODEV;
++	}
++
++	return 0;
++}
++
++static const struct dwc3_acpi_pdata sdm845_acpi_pdata = {
++	.qscratch_base_offset = SDM845_QSCRATCH_BASE_OFFSET,
++	.qscratch_base_size = SDM845_QSCRATCH_SIZE,
++	.dwc3_core_base_size = SDM845_DWC3_CORE_SIZE,
++	.hs_phy_irq_index = 1,
++	.dp_hs_phy_irq_index = 4,
++	.dm_hs_phy_irq_index = 3,
++	.ss_phy_irq_index = 2
++};
++
++static int dwc3_qcom_probe(struct platform_device *pdev)
++{
++	struct device_node	*np = pdev->dev.of_node;
++	struct device		*dev = &pdev->dev;
+ 	struct dwc3_qcom	*qcom;
+-	struct resource		*res;
++	struct resource		*res, *parent_res = NULL;
+ 	int			ret, i;
+ 	bool			ignore_pipe_clk;
+ 
+@@ -425,6 +551,14 @@ static int dwc3_qcom_probe(struct platform_device *pdev)
+ 	platform_set_drvdata(pdev, qcom);
+ 	qcom->dev = &pdev->dev;
+ 
++	if (has_acpi_companion(dev)) {
++		qcom->acpi_pdata = acpi_device_get_match_data(dev);
++		if (!qcom->acpi_pdata) {
++			dev_err(&pdev->dev, "no supporting ACPI device data\n");
++			return -EINVAL;
++		}
++	}
++
+ 	qcom->resets = devm_reset_control_array_get_optional_exclusive(dev);
+ 	if (IS_ERR(qcom->resets)) {
+ 		ret = PTR_ERR(qcom->resets);
+@@ -454,7 +588,21 @@ static int dwc3_qcom_probe(struct platform_device *pdev)
+ 	}
+ 
+ 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+-	qcom->qscratch_base = devm_ioremap_resource(dev, res);
++
++	if (np) {
++		parent_res = res;
++	} else {
++		parent_res = kmemdup(res, sizeof(struct resource), GFP_KERNEL);
++		if (!parent_res)
++			return -ENOMEM;
++
++		parent_res->start = res->start +
++			qcom->acpi_pdata->qscratch_base_offset;
++		parent_res->end = parent_res->start +
++			qcom->acpi_pdata->qscratch_base_size;
++	}
++
++	qcom->qscratch_base = devm_ioremap_resource(dev, parent_res);
+ 	if (IS_ERR(qcom->qscratch_base)) {
+ 		dev_err(dev, "failed to map qscratch, err=%d\n", ret);
+ 		ret = PTR_ERR(qcom->qscratch_base);
+@@ -462,13 +610,8 @@ static int dwc3_qcom_probe(struct platform_device *pdev)
+ 	}
+ 
+ 	ret = dwc3_qcom_setup_irq(pdev);
+-	if (ret)
+-		goto clk_disable;
+-
+-	dwc3_np = of_get_child_by_name(np, "dwc3");
+-	if (!dwc3_np) {
+-		dev_err(dev, "failed to find dwc3 core child\n");
+-		ret = -ENODEV;
++	if (ret) {
++		dev_err(dev, "failed to setup IRQs, err=%d\n", ret);
+ 		goto clk_disable;
+ 	}
+ 
+@@ -481,16 +624,13 @@ static int dwc3_qcom_probe(struct platform_device *pdev)
+ 	if (ignore_pipe_clk)
+ 		dwc3_qcom_select_utmi_clk(qcom);
+ 
+-	ret = of_platform_populate(np, NULL, NULL, dev);
+-	if (ret) {
+-		dev_err(dev, "failed to register dwc3 core - %d\n", ret);
+-		goto clk_disable;
+-	}
++	if (np)
++		ret = dwc3_qcom_of_register_core(pdev);
++	else
++		ret = dwc3_qcom_acpi_register_core(pdev);
+ 
+-	qcom->dwc3 = of_find_device_by_node(dwc3_np);
+-	if (!qcom->dwc3) {
+-		dev_err(&pdev->dev, "failed to get dwc3 platform device\n");
+-		ret = -ENODEV;
++	if (ret) {
++		dev_err(dev, "failed to register DWC3 Core, err=%d\n", ret);
+ 		goto depopulate;
+ 	}
+ 
+@@ -514,7 +654,10 @@ static int dwc3_qcom_probe(struct platform_device *pdev)
+ 	return 0;
+ 
+ depopulate:
+-	of_platform_depopulate(&pdev->dev);
++	if (np)
++		of_platform_depopulate(&pdev->dev);
++	else
++		platform_device_put(pdev);
+ clk_disable:
+ 	for (i = qcom->num_clocks - 1; i >= 0; i--) {
+ 		clk_disable_unprepare(qcom->clks[i]);
+@@ -601,6 +744,12 @@ static const struct of_device_id dwc3_qcom_of_match[] = {
+ };
+ MODULE_DEVICE_TABLE(of, dwc3_qcom_of_match);
+ 
++static const struct acpi_device_id dwc3_qcom_acpi_match[] = {
++	{ "QCOM2430", (unsigned long)&sdm845_acpi_pdata },
++	{ },
++};
++MODULE_DEVICE_TABLE(acpi, dwc3_qcom_acpi_match);
++
+ static struct platform_driver dwc3_qcom_driver = {
+ 	.probe		= dwc3_qcom_probe,
+ 	.remove		= dwc3_qcom_remove,
+@@ -608,6 +757,7 @@ static struct platform_driver dwc3_qcom_driver = {
+ 		.name	= "dwc3-qcom",
+ 		.pm	= &dwc3_qcom_dev_pm_ops,
+ 		.of_match_table	= dwc3_qcom_of_match,
++		.acpi_match_table = ACPI_PTR(dwc3_qcom_acpi_match),
+ 	},
+ };
+ 
+
+From patchwork Mon Jun 17 12:51:04 2019
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+ Mon, 17 Jun 2019 05:51:11 -0700 (PDT)
+From: Lee Jones <lee.jones@linaro.org>
+To: alokc@codeaurora.org, agross@kernel.org, david.brown@linaro.org,
+ bjorn.andersson@linaro.org, balbi@kernel.org, gregkh@linuxfoundation.org,
+ ard.biesheuvel@linaro.org, jlhugo@gmail.com, linux-arm-msm@vger.kernel.org,
+ linux-usb@vger.kernel.org, felipe.balbi@linux.intel.com
+Subject: [RESEND v4 3/4] usb: dwc3: qcom: Start USB in 'host mode' on the
+ SDM845
+Date: Mon, 17 Jun 2019 13:51:04 +0100
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+When booting with Device Tree, the current default boot configuration
+table option, the request to boot via 'host mode' comes from the
+'dr_mode' property.  A property of the same name can be used inside
+ACPI tables too.  However it is missing from the SDM845's ACPI tables
+so we have to supply this information using Platform Device Properties
+instead.
+
+This does not change the behaviour of any currently supported devices.
+The property is only set on ACPI enabled platforms, thus for H/W
+booting DT, unless a 'dr_mode' property is present, the default is
+still OTG (On-The-Go) as per [0].  Any new ACPI devices added will
+also be able to over-ride this implementation by providing a 'dr_mode'
+property in their ACPI tables.  In cases where 'dr_mode' is omitted
+from the tables AND 'host mode' should not be the default (very
+unlikely), then we will have to add some way of choosing between them
+at run time - most likely by ACPI HID.
+
+[0] Documentation/devicetree/bindings/usb/generic.txt
+
+Signed-off-by: Lee Jones <lee.jones@linaro.org>
+Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
+---
+ drivers/usb/dwc3/dwc3-qcom.c | 12 ++++++++++++
+ 1 file changed, 12 insertions(+)
+
+diff --git a/drivers/usb/dwc3/dwc3-qcom.c b/drivers/usb/dwc3/dwc3-qcom.c
+index 0cb63f6c92d9..2d050303d564 100644
+--- a/drivers/usb/dwc3/dwc3-qcom.c
++++ b/drivers/usb/dwc3/dwc3-qcom.c
+@@ -444,6 +444,11 @@ static int dwc3_qcom_clk_init(struct dwc3_qcom *qcom, int count)
+ 	return 0;
+ }
+ 
++static const struct property_entry dwc3_qcom_acpi_properties[] = {
++	PROPERTY_ENTRY_STRING("dr_mode", "host"),
++	{}
++};
++
+ static int dwc3_qcom_acpi_register_core(struct platform_device *pdev)
+ {
+ 	struct dwc3_qcom 	*qcom = platform_get_drvdata(pdev);
+@@ -488,6 +493,13 @@ static int dwc3_qcom_acpi_register_core(struct platform_device *pdev)
+ 		goto out;
+ 	}
+ 
++	ret = platform_device_add_properties(qcom->dwc3,
++					     dwc3_qcom_acpi_properties);
++	if (ret < 0) {
++		dev_err(&pdev->dev, "failed to add properties\n");
++		goto out;
++	}
++
+ 	ret = platform_device_add(qcom->dwc3);
+ 	if (ret)
+ 		dev_err(&pdev->dev, "failed to add device\n");
+
+From patchwork Mon Jun 17 12:51:05 2019
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+ Mon, 17 Jun 2019 05:51:12 -0700 (PDT)
+From: Lee Jones <lee.jones@linaro.org>
+To: alokc@codeaurora.org, agross@kernel.org, david.brown@linaro.org,
+ bjorn.andersson@linaro.org, balbi@kernel.org, gregkh@linuxfoundation.org,
+ ard.biesheuvel@linaro.org, jlhugo@gmail.com, linux-arm-msm@vger.kernel.org,
+ linux-usb@vger.kernel.org, felipe.balbi@linux.intel.com
+Subject: [RESEND v4 4/4] usb: dwc3: qcom: Improve error handling
+Date: Mon, 17 Jun 2019 13:51:05 +0100
+Message-Id: <20190617125105.6186-5-lee.jones@linaro.org>
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+
+dwc3_qcom_clk_init() is called with of_count_phandle_with_args() as an
+argument.  If of_count_phandle_with_args() returns an error, the number
+of clocks will be a negative value and will lead to undefined behaviour.
+
+Ensure we check for an error before attempting to blindly use the value.
+
+Signed-off-by: Lee Jones <lee.jones@linaro.org>
+Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
+---
+ drivers/usb/dwc3/dwc3-qcom.c | 3 +++
+ 1 file changed, 3 insertions(+)
+
+diff --git a/drivers/usb/dwc3/dwc3-qcom.c b/drivers/usb/dwc3/dwc3-qcom.c
+index 2d050303d564..c59e9d8e8609 100644
+--- a/drivers/usb/dwc3/dwc3-qcom.c
++++ b/drivers/usb/dwc3/dwc3-qcom.c
+@@ -409,6 +409,9 @@ static int dwc3_qcom_clk_init(struct dwc3_qcom *qcom, int count)
+ 	if (!np || !count)
+ 		return 0;
+ 
++	if (count < 0)
++		return count;
++
+ 	qcom->num_clocks = count;
+ 
+ 	qcom->clks = devm_kcalloc(dev, qcom->num_clocks,