From patchwork Thu Aug 29 11:56:00 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Saranya Gopal X-Patchwork-Id: 11121257 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 44EBE112C for ; Thu, 29 Aug 2019 12:10:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 2C6FE22CF5 for ; Thu, 29 Aug 2019 12:10:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727008AbfH2MKB (ORCPT ); Thu, 29 Aug 2019 08:10:01 -0400 Received: from mga04.intel.com ([192.55.52.120]:34525 "EHLO mga04.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725990AbfH2MKB (ORCPT ); Thu, 29 Aug 2019 08:10:01 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga006.jf.intel.com ([10.7.209.51]) by fmsmga104.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 29 Aug 2019 05:10:01 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.64,442,1559545200"; d="scan'208";a="185950356" Received: from saranya-h97m-d3h.iind.intel.com ([10.66.247.130]) by orsmga006.jf.intel.com with ESMTP; 29 Aug 2019 05:09:58 -0700 From: Saranya Gopal To: hdegoede@redhat.com, heikki.krogerus@linux.intel.com Cc: gregkh@linuxfoundation.org, mathias.nyman@intel.com, linux-usb@vger.kernel.org, Saranya Gopal , Balaji Manoharan Subject: [PATCH v5 2/2] usb: roles: intel: Enable static DRD mode for role switch Date: Thu, 29 Aug 2019 17:26:00 +0530 Message-Id: <1567079760-24822-2-git-send-email-saranya.gopal@intel.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1567079760-24822-1-git-send-email-saranya.gopal@intel.com> References: <1567079760-24822-1-git-send-email-saranya.gopal@intel.com> Sender: linux-usb-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org Enable static DRD mode in Intel platforms which guarantees successful role switch all the time. This fixes issues like software role switch failure after cold boot and issue with role switch when USB 3.0 cable is used. But, do not enable static DRD mode for Cherrytrail devices which rely on firmware for role switch. Signed-off-by: Saranya Gopal Signed-off-by: Balaji Manoharan Reviewed-by: Heikki Krogerus Reviewed-by: Hans de Goede Tested-by: Hans de Goede --- changes since v4: Rebased on top of devprop branch in linux-pm.git Added Reviewed-by and Tested-by tags changes since v3: Initialized drd_config variable to fix warning changes since v2: Revised SoB tags changes since v1: Added drd_config to avoid multiple if checks Other minor changes suggested by Hans drivers/usb/roles/intel-xhci-usb-role-switch.c | 27 ++++++++++++++++++++++++-- 1 file changed, 25 insertions(+), 2 deletions(-) diff --git a/drivers/usb/roles/intel-xhci-usb-role-switch.c b/drivers/usb/roles/intel-xhci-usb-role-switch.c index 7325a84..4098513 100644 --- a/drivers/usb/roles/intel-xhci-usb-role-switch.c +++ b/drivers/usb/roles/intel-xhci-usb-role-switch.c @@ -19,6 +19,7 @@ #include #include #include +#include #include /* register definition */ @@ -26,6 +27,12 @@ #define SW_VBUS_VALID BIT(24) #define SW_IDPIN_EN BIT(21) #define SW_IDPIN BIT(20) +#define SW_SWITCH_EN BIT(16) + +#define DRD_CONFIG_DYNAMIC 0 +#define DRD_CONFIG_STATIC_HOST 1 +#define DRD_CONFIG_STATIC_DEVICE 2 +#define DRD_CONFIG_MASK 3 #define DUAL_ROLE_CFG1 0x6c #define HOST_MODE BIT(29) @@ -37,6 +44,7 @@ struct intel_xhci_usb_data { struct usb_role_switch *role_sw; void __iomem *base; + bool enable_sw_switch; }; static const struct software_node intel_xhci_usb_node = { @@ -49,6 +57,7 @@ static int intel_xhci_usb_set_role(struct device *dev, enum usb_role role) unsigned long timeout; acpi_status status; u32 glk, val; + u32 drd_config = DRD_CONFIG_DYNAMIC; /* * On many CHT devices ACPI event (_AEI) handlers read / modify / @@ -63,24 +72,35 @@ static int intel_xhci_usb_set_role(struct device *dev, enum usb_role role) pm_runtime_get_sync(dev); - /* Set idpin value as requested */ + /* + * Set idpin value as requested. + * Since some devices rely on firmware setting DRD_CONFIG and + * SW_SWITCH_EN bits to be zero for role switch, + * do not set these bits for those devices. + */ val = readl(data->base + DUAL_ROLE_CFG0); switch (role) { case USB_ROLE_NONE: val |= SW_IDPIN; val &= ~SW_VBUS_VALID; + drd_config = DRD_CONFIG_DYNAMIC; break; case USB_ROLE_HOST: val &= ~SW_IDPIN; val &= ~SW_VBUS_VALID; + drd_config = DRD_CONFIG_STATIC_HOST; break; case USB_ROLE_DEVICE: val |= SW_IDPIN; val |= SW_VBUS_VALID; + drd_config = DRD_CONFIG_STATIC_DEVICE; break; } val |= SW_IDPIN_EN; - + if (data->enable_sw_switch) { + val &= ~DRD_CONFIG_MASK; + val |= SW_SWITCH_EN | drd_config; + } writel(val, data->base + DUAL_ROLE_CFG0); acpi_release_global_lock(glk); @@ -156,6 +176,9 @@ static int intel_xhci_usb_probe(struct platform_device *pdev) sw_desc.allow_userspace_control = true, sw_desc.fwnode = software_node_fwnode(&intel_xhci_usb_node); + data->enable_sw_switch = !device_property_read_bool(dev, + "sw_switch_disable"); + data->role_sw = usb_role_switch_register(dev, &sw_desc); if (IS_ERR(data->role_sw)) { fwnode_handle_put(sw_desc.fwnode);