Revert "xhci: Reset Renesas uPD72020x USB controller for 32-bit DMA issue"

This reverts commit 8466489e.

Now that we can properly reset the uPD72020x without a hard PCI reset,
let's get rid of the existing quirks.
Tested-by: NDomenico Andreoli <domenico.andreoli@linux.com>
Signed-off-by: NMarc Zyngier <marc.zyngier@arm.com>
Tested-by: NFaiz Abbas <faiz_abbas@ti.com>
Tested-by: NDomenico Andreoli <domenico.andreoli@linux.com>
Acked-by: NMathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/host/pci-quirks.c

@@ -1268,23 +1268,3 @@ static void quirk_usb_early_handoff(struct pci_dev *pdev)
 }
 DECLARE_PCI_FIXUP_CLASS_FINAL(PCI_ANY_ID, PCI_ANY_ID,
 			PCI_CLASS_SERIAL_USB, 8, quirk_usb_early_handoff);
-
-bool usb_xhci_needs_pci_reset(struct pci_dev *pdev)
-{
-	/*
-	 * Our dear uPD72020{1,2} friend only partially resets when
-	 * asked to via the XHCI interface, and may end up doing DMA
-	 * at the wrong addresses, as it keeps the top 32bit of some
-	 * addresses from its previous programming under obscure
-	 * circumstances.
-	 * Give it a good wack at probe time. Unfortunately, this
-	 * needs to happen before we've had a chance to discover any
-	 * quirk, or the system will be in a rather bad state.
-	 */
-	if (pdev->vendor == PCI_VENDOR_ID_RENESAS &&
-	    (pdev->device == 0x0014 || pdev->device == 0x0015))
-		return true;
-
-	return false;
-}
-EXPORT_SYMBOL_GPL(usb_xhci_needs_pci_reset);

drivers/usb/host/pci-quirks.h

@@ -16,7 +16,6 @@ void usb_asmedia_modifyflowcontrol(struct pci_dev *pdev);
 void usb_enable_intel_xhci_ports(struct pci_dev *xhci_pdev);
 void usb_disable_xhci_ports(struct pci_dev *xhci_pdev);
 void sb800_prefetch(struct device *dev, int on);
-bool usb_xhci_needs_pci_reset(struct pci_dev *pdev);
 bool usb_amd_pt_check_port(struct device *device, int port);
 #else
 struct pci_dev;

drivers/usb/host/xhci-pci.c

@@ -288,13 +288,6 @@ static int xhci_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
 
 	driver = (struct hc_driver *)id->driver_data;
 
-	/* For some HW implementation, a XHCI reset is just not enough... */
-	if (usb_xhci_needs_pci_reset(dev)) {
-		dev_info(&dev->dev, "Resetting\n");
-		if (pci_reset_function_locked(dev))
-			dev_warn(&dev->dev, "Reset failed");
-	}
-
 	/* Prevent runtime suspending between USB-2 and USB-3 initialization */
 	pm_runtime_get_noresume(&dev->dev);