linux-kernel - [PATCH v2 2/2] USB: xhci: add support for PWRON active high

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20241007093205.27130-3-francesco@dolcini.it>
Date: Mon,  7 Oct 2024 11:32:05 +0200
From: Francesco Dolcini <francesco@...cini.it>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Mathias Nyman <mathias.nyman@...el.com>,
	Francesco Dolcini <francesco.dolcini@...adex.com>
Cc: Parth Pancholi <parth.pancholi@...adex.com>,
	linux-usb@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 2/2] USB: xhci: add support for PWRON active high

From: Parth Pancholi <parth.pancholi@...adex.com>

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,tusb7320-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: Parth Pancholi <parth.pancholi@...adex.com>
Signed-off-by: Francesco Dolcini <francesco.dolcini@...adex.com>
---
v2: s/polarity-invert/active-high
---
 drivers/usb/host/xhci-pci.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c
index 91dccd25a551..4bdef01735eb 100644
--- a/drivers/usb/host/xhci-pci.c
+++ b/drivers/usb/host/xhci-pci.c
@@ -641,6 +641,9 @@ 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,tusb7320-pwron-active-high"))
+		pci_clear_and_set_config_dword(dev, 0xE0, 0, 1 << 22);
+
 	return 0;
 
 put_usb3_hcd:
-- 
2.39.5