From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S941537AbcKQSCj (ORCPT ); Thu, 17 Nov 2016 13:02:39 -0500 Received: from fllnx209.ext.ti.com ([198.47.19.16]:28281 "EHLO fllnx209.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S941321AbcKQSCe (ORCPT ); Thu, 17 Nov 2016 13:02:34 -0500 From: Roger Quadros To: , CC: , , Subject: [PATCH 1/3] usb: xhci: add quirk flag for broken PED bits Date: Thu, 17 Nov 2016 17:01:19 +0200 Message-ID: <1479394881-13863-2-git-send-email-rogerq@ti.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1479394881-13863-1-git-send-email-rogerq@ti.com> References: <1479394881-13863-1-git-send-email-rogerq@ti.com> MIME-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Felipe Balbi 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 Signed-off-by: Roger Quadros --- 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