linux-kernel - [PATCH] usb: cdnsp: changes PCI Device ID to fix conflict with CNDS3 driver

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Date:   Thu, 9 Mar 2023 01:30:48 -0500
From:   Pawel Laszczak <pawell@...ence.com>
To:     <peter.chen@...nel.org>
CC:     <gregkh@...uxfoundation.org>, <linux-usb@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <pawell@...ence.com>,
        <stable@...r.kernel.org>
Subject: [PATCH] usb: cdnsp: changes PCI Device ID to fix conflict with CNDS3 driver

Patch changes CDNS_DEVICE_ID in USBSSP PCI Glue driver to remove
the conflict with Cadence USBSS driver.

cc: <stable@...r.kernel.org>
Fixes: 3d82904559f4 ("usb: cdnsp: cdns3 Add main part of Cadence USBSSP DRD Driver")
Signed-off-by: Pawel Laszczak <pawell@...ence.com>
---
 drivers/usb/cdns3/cdnsp-pci.c | 27 +++++++++++----------------
 1 file changed, 11 insertions(+), 16 deletions(-)

diff --git a/drivers/usb/cdns3/cdnsp-pci.c b/drivers/usb/cdns3/cdnsp-pci.c
index efd54ed918b9..7b151f5af3cc 100644
--- a/drivers/usb/cdns3/cdnsp-pci.c
+++ b/drivers/usb/cdns3/cdnsp-pci.c
@@ -29,30 +29,23 @@
 #define PLAT_DRIVER_NAME	"cdns-usbssp"
 
 #define CDNS_VENDOR_ID		0x17cd
-#define CDNS_DEVICE_ID		0x0100
+#define CDNS_DEVICE_ID		0x0200
+#define CDNS_DRD_ID		0x0100
 #define CDNS_DRD_IF		(PCI_CLASS_SERIAL_USB << 8 | 0x80)
 
 static struct pci_dev *cdnsp_get_second_fun(struct pci_dev *pdev)
 {
-	struct pci_dev *func;
-
 	/*
 	 * Gets the second function.
-	 * It's little tricky, but this platform has two function.
-	 * The fist keeps resources for Host/Device while the second
-	 * keeps resources for DRD/OTG.
+	 * Platform has two function. The fist keeps resources for
+	 * Host/Device while the secon keeps resources for DRD/OTG.
 	 */
-	func = pci_get_device(pdev->vendor, pdev->device, NULL);
-	if (!func)
-		return NULL;
+	if (pdev->device == CDNS_DEVICE_ID)
+		return  pci_get_device(pdev->vendor, CDNS_DRD_ID, NULL);
+	else if (pdev->device == CDNS_DRD_ID)
+		return pci_get_device(pdev->vendor, CDNS_DEVICE_ID, NULL);
 
-	if (func->devfn == pdev->devfn) {
-		func = pci_get_device(pdev->vendor, pdev->device, func);
-		if (!func)
-			return NULL;
-	}
-
-	return func;
+	return NULL;
 }
 
 static int cdnsp_pci_probe(struct pci_dev *pdev,
@@ -230,6 +223,8 @@ static const struct pci_device_id cdnsp_pci_ids[] = {
 	  PCI_CLASS_SERIAL_USB_DEVICE, PCI_ANY_ID },
 	{ PCI_VENDOR_ID_CDNS, CDNS_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,
 	  CDNS_DRD_IF, PCI_ANY_ID },
+	{ PCI_VENDOR_ID_CDNS, CDNS_DRD_ID, PCI_ANY_ID, PCI_ANY_ID,
+	  CDNS_DRD_IF, PCI_ANY_ID },
 	{ 0, }
 };
 
-- 
2.25.1