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: <1479394881-13863-2-git-send-email-rogerq@ti.com>
Date:   Thu, 17 Nov 2016 17:01:19 +0200
From:   Roger Quadros <rogerq@...com>
To:     <balbi@...nel.org>, <mathias.nyman@...el.com>
CC:     <linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <rogerq@...com>
Subject: [PATCH 1/3] usb: xhci: add quirk flag for broken PED bits

From: Felipe Balbi <balbi@...com>

Some devices from Texas Instruments [1] suffer from
a silicon bug where Port Enabled/Disabled bit
should not be used to silence an erroneous device.

The bug is so that if port is disabled with PED
bit, an IRQ for device removal (or attachment)
will never fire.

Just for the sake of completeness, the actual
problem lies with SNPS USB IP and this affects
all known versions up to 3.00a. A separate
patch will be added to dwc3 to enabled this
quirk flag if version is <= 3.00a.

[1] - AM572x Silicon Errata http://www.ti.com/lit/er/sprz429j/sprz429j.pdf
Section i896— USB xHCI Port Disable Feature Does Not Work

Signed-off-by: Felipe Balbi <balbi@...com>
Signed-off-by: Roger Quadros <rogerq@...com>
---
 drivers/usb/host/xhci-hub.c | 6 ++++++
 drivers/usb/host/xhci.h     | 3 +++
 2 files changed, 9 insertions(+)

diff --git a/drivers/usb/host/xhci-hub.c b/drivers/usb/host/xhci-hub.c
index 0ef1690..c3c051d 100644
--- a/drivers/usb/host/xhci-hub.c
+++ b/drivers/usb/host/xhci-hub.c
@@ -458,6 +458,12 @@ static void xhci_disable_port(struct usb_hcd *hcd, struct xhci_hcd *xhci,
 		return;
 	}
 
+	if (xhci->quirks & XHCI_BROKEN_PORT_PED) {
+		xhci_dbg(xhci, "Broken Port Enabled/Disabled, ignoring "
+				"port disable request.\n");
+		return;
+	}
+
 	/* Write 1 to disable the port */
 	writel(port_status | PORT_PE, addr);
 	port_status = readl(addr);
diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h
index f945380..4f724aa 100644
--- a/drivers/usb/host/xhci.h
+++ b/drivers/usb/host/xhci.h
@@ -1656,6 +1656,9 @@ struct xhci_hcd {
 #define XHCI_SSIC_PORT_UNUSED	(1 << 22)
 #define XHCI_NO_64BIT_SUPPORT	(1 << 23)
 #define XHCI_MISSING_CAS	(1 << 24)
+/* For controller with a broken Port Disable implementation */
+#define XHCI_BROKEN_PORT_PED    (1 << 21)
+
 	unsigned int		num_active_eps;
 	unsigned int		limit_active_eps;
 	/* There are two roothubs to keep track of bus suspend info for */
-- 
2.7.4

Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ