Commit c74c2cc7 authored by Parth Pancholi's avatar Parth Pancholi Committed by Greg Kroah-Hartman
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USB: xhci: add support for PWRON active high 



Some PCIe-to-USB controllers such as TI's TUSB73x0 3.0 xHCI host
controller supports controlling the PWRONx polarity via the USB control
register (E0h). Add support for device tree property
ti,pwron-active-high which indicates PWRONx to be active high and
configure the E0h register accordingly.  This enables the software
control for the TUSB73x0's PWRONx outputs with an inverted polarity from
the default configuration which could be used as USB EN signals for the
other hubs or devices.

Signed-off-by: default avatarParth Pancholi <parth.pancholi@toradex.com>
Signed-off-by: default avatarFrancesco Dolcini <francesco.dolcini@toradex.com>
Link: https://lore.kernel.org/r/20241029072444.8827-3-francesco@dolcini.it


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent d9649a7e

drivers/usb/host/xhci-pci.c

+3 −0
Original line number Diff line number Diff line
@@ -646,6 +646,9 @@ int xhci_pci_common_probe(struct pci_dev *dev, const struct pci_device_id *id) 


	dma_set_max_seg_size(&dev->dev, UINT_MAX);



	if (device_property_read_bool(&dev->dev, "ti,pwron-active-high"))

		pci_clear_and_set_config_dword(dev, 0xE0, 0, 1 << 22);



	return 0;



put_usb3_hcd: