commit 8466489ef5ba48272ba4fa4ea9f8f403306de4c7
Author: Marc Zyngier <marc.zyngier@xxxxxxx>
Date: Tue Aug 1 20:11:08 2017 -0500
xhci: Reset Renesas uPD72020x USB controller for 32-bit DMA issue
...
...
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--- a/drivers/usb/host/xhci-pci.c
+++ b/drivers/usb/host/xhci-pci.c
@@ -284,6 +284,13 @@ 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");
+ }
+
________
This pci_reset_function_locked call, causes my i.mx6qp processor to hang. It no longer responds to
the MAGIC_SYSRQ key (break on serial port).
If I comment it out, things return to normal when testing on Linux-next (20171222).
If you need more info, let me know.
Thanks
Troy
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