From patchwork Thu Jul 16 00:33:10 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Mani, Rajmohan" X-Patchwork-Id: 11666451 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 33C2060D for ; Thu, 16 Jul 2020 00:50:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1DFFB20658 for ; Thu, 16 Jul 2020 00:50:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727943AbgGPAuO (ORCPT ); Wed, 15 Jul 2020 20:50:14 -0400 Received: from mga14.intel.com ([192.55.52.115]:57225 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727906AbgGPAuK (ORCPT ); Wed, 15 Jul 2020 20:50:10 -0400 IronPort-SDR: iv80tgvSY1KB1bmMeTTTtoILCC0jVW7Ay8bmzuJ6UfAKIo47WDzwgmbCOZE4bhMh6wxMu7CRbV +kavISjahyvg== X-IronPort-AV: E=McAfee;i="6000,8403,9683"; a="148445963" X-IronPort-AV: E=Sophos;i="5.75,357,1589266800"; d="scan'208";a="148445963" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga008.jf.intel.com ([10.7.209.65]) by fmsmga103.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 15 Jul 2020 17:50:05 -0700 IronPort-SDR: gbECWBVW9YAlTseyflmb4Carimxx5ju0QLQUUH4W33jnqjRW4qI1WPDJplbYIG3Yaw0lZMEk96 w1ik/sd9re+Q== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.75,357,1589266800"; d="scan'208";a="316874134" Received: from glacier.sc.intel.com ([10.3.62.63]) by orsmga008.jf.intel.com with ESMTP; 15 Jul 2020 17:50:05 -0700 From: Rajmohan Mani To: Darren Hart , Andy Shevchenko , Mika Westerberg , Dmitry Torokhov , Lee Jones , Ayman Bagabas , Masahiro Yamada , Jithu Joseph , =?utf-8?q?Bla=C5=BE_Hrastnik?= , Srinivas Pandruvada , linux-kernel@vger.kernel.org, platform-driver-x86@vger.kernel.org, Heikki Krogerus , Greg Kroah-Hartman , linux-usb@vger.kernel.org Cc: pmalani@chromium.org, bleung@chromium.org Subject: [PATCH 2/2] usb: typec: intel_pmc_mux: Check the port status before connect Date: Wed, 15 Jul 2020 17:33:10 -0700 Message-Id: <20200716003310.26125-3-rajmohan.mani@intel.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200716003310.26125-1-rajmohan.mani@intel.com> References: <20200716003310.26125-1-rajmohan.mani@intel.com> MIME-Version: 1.0 Sender: linux-usb-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org From: Heikki Krogerus The PMC microcontroller that we use for configuration, does not supply any status information back. For port status we need to talk to another controller on the board called IOM (I/O manager). By checking the port status before configuring the muxes, we can make sure that we do not reconfigure the port after bootup when the system firmware (for example BIOS) has already configured it. Using the status information also to check if DisplayPort HPD is still asserted when the cable plug is disconnected, and clearing it if it is. Signed-off-by: Heikki Krogerus --- drivers/usb/typec/mux/Kconfig | 1 + drivers/usb/typec/mux/intel_pmc_mux.c | 73 +++++++++++++++++++++++---- 2 files changed, 64 insertions(+), 10 deletions(-) diff --git a/drivers/usb/typec/mux/Kconfig b/drivers/usb/typec/mux/Kconfig index a4dbd11f8ee2..46f5512de63d 100644 --- a/drivers/usb/typec/mux/Kconfig +++ b/drivers/usb/typec/mux/Kconfig @@ -12,6 +12,7 @@ config TYPEC_MUX_PI3USB30532 config TYPEC_MUX_INTEL_PMC tristate "Intel PMC mux control" depends on INTEL_SCU_IPC + depends on INTEL_IOM select USB_ROLE_SWITCH help Driver for USB muxes controlled by Intel PMC FW. Intel PMC FW can diff --git a/drivers/usb/typec/mux/intel_pmc_mux.c b/drivers/usb/typec/mux/intel_pmc_mux.c index 2aba07c7b221..84101fb99934 100644 --- a/drivers/usb/typec/mux/intel_pmc_mux.c +++ b/drivers/usb/typec/mux/intel_pmc_mux.c @@ -9,6 +9,7 @@ #include #include #include +#include #include #include #include @@ -83,10 +84,17 @@ enum { #define PMC_USB_DP_HPD_LVL BIT(4) #define PMC_USB_DP_HPD_IRQ BIT(5) +/* IOM Port Status */ +#define IOM_PORT_ACTIVITY_IS(_status_, _type_) \ + ((((_status_) & IOM_PORT_STATUS_ACTIVITY_TYPE_MASK) >> \ + IOM_PORT_STATUS_ACTIVITY_TYPE_SHIFT) == \ + (IOM_PORT_STATUS_ACTIVITY_TYPE_##_type_)) + struct pmc_usb; struct pmc_usb_port { int num; + u32 iom_status; struct pmc_usb *pmc; struct typec_mux *typec_mux; struct typec_switch *typec_sw; @@ -105,6 +113,7 @@ struct pmc_usb_port { struct pmc_usb { u8 num_ports; struct device *dev; + struct intel_iom *iom; struct intel_scu_ipc_dev *ipc; struct pmc_usb_port *port; }; @@ -145,18 +154,17 @@ static int pmc_usb_command(struct pmc_usb_port *port, u8 *msg, u32 len) } static int -pmc_usb_mux_dp_hpd(struct pmc_usb_port *port, struct typec_mux_state *state) +pmc_usb_mux_dp_hpd(struct pmc_usb_port *port, struct typec_displayport_data *dp) { - struct typec_displayport_data *data = state->data; u8 msg[2] = { }; msg[0] = PMC_USB_DP_HPD; msg[0] |= port->usb3_port << PMC_USB_MSG_USB3_PORT_SHIFT; - if (data->status & DP_STATUS_IRQ_HPD) + if (dp->status & DP_STATUS_IRQ_HPD) msg[1] = PMC_USB_DP_HPD_IRQ; - if (data->status & DP_STATUS_HPD_STATE) + if (dp->status & DP_STATUS_HPD_STATE) msg[1] |= PMC_USB_DP_HPD_LVL; return pmc_usb_command(port, msg, sizeof(msg)); @@ -169,8 +177,12 @@ pmc_usb_mux_dp(struct pmc_usb_port *port, struct typec_mux_state *state) struct altmode_req req = { }; int ret; + if (IOM_PORT_ACTIVITY_IS(port->iom_status, DP) || + IOM_PORT_ACTIVITY_IS(port->iom_status, DP_MFD)) + return 0; + if (data->status & DP_STATUS_IRQ_HPD) - return pmc_usb_mux_dp_hpd(port, state); + return pmc_usb_mux_dp_hpd(port, state->data); req.usage = PMC_USB_ALT_MODE; req.usage |= port->usb3_port << PMC_USB_MSG_USB3_PORT_SHIFT; @@ -193,7 +205,7 @@ pmc_usb_mux_dp(struct pmc_usb_port *port, struct typec_mux_state *state) return ret; if (data->status & DP_STATUS_HPD_STATE) - return pmc_usb_mux_dp_hpd(port, state); + return pmc_usb_mux_dp_hpd(port, state->data); return 0; } @@ -205,6 +217,10 @@ pmc_usb_mux_tbt(struct pmc_usb_port *port, struct typec_mux_state *state) u8 cable_speed = TBT_CABLE_SPEED(data->cable_mode); struct altmode_req req = { }; + if (IOM_PORT_ACTIVITY_IS(port->iom_status, TBT) || + IOM_PORT_ACTIVITY_IS(port->iom_status, ALT_MODE_TBT_USB)) + return 0; + req.usage = PMC_USB_ALT_MODE; req.usage |= port->usb3_port << PMC_USB_MSG_USB3_PORT_SHIFT; req.mode_type = PMC_USB_MODE_TYPE_TBT << PMC_USB_MODE_TYPE_SHIFT; @@ -239,6 +255,10 @@ pmc_usb_mux_usb4(struct pmc_usb_port *port, struct typec_mux_state *state) struct altmode_req req = { }; u8 cable_speed; + if (IOM_PORT_ACTIVITY_IS(port->iom_status, TBT) || + IOM_PORT_ACTIVITY_IS(port->iom_status, ALT_MODE_TBT_USB)) + return 0; + req.usage = PMC_USB_ALT_MODE; req.usage |= port->usb3_port << PMC_USB_MSG_USB3_PORT_SHIFT; req.mode_type = PMC_USB_MODE_TYPE_TBT << PMC_USB_MODE_TYPE_SHIFT; @@ -273,6 +293,9 @@ static int pmc_usb_mux_safe_state(struct pmc_usb_port *port) { u8 msg; + if (IOM_PORT_ACTIVITY_IS(port->iom_status, SAFE_MODE)) + return 0; + msg = PMC_USB_SAFE_MODE; msg |= port->usb3_port << PMC_USB_MSG_USB3_PORT_SHIFT; @@ -283,6 +306,9 @@ static int pmc_usb_connect(struct pmc_usb_port *port) { u8 msg[2]; + if (port->iom_status & IOM_PORT_STATUS_CONNECTED) + return 0; + msg[0] = PMC_USB_CONNECT; msg[0] |= port->usb3_port << PMC_USB_MSG_USB3_PORT_SHIFT; @@ -295,8 +321,18 @@ static int pmc_usb_connect(struct pmc_usb_port *port) static int pmc_usb_disconnect(struct pmc_usb_port *port) { + struct typec_displayport_data data = { }; u8 msg[2]; + if (!(port->iom_status & IOM_PORT_STATUS_CONNECTED)) + return 0; + + /* Clear DisplayPort HPD if it's still asserted. */ + if (((port->iom_status & IOM_PORT_STATUS_DHPD_HPD_STATUS_MASK) >> + IOM_PORT_STATUS_DHPD_HPD_STATUS_SHIFT) & + IOM_PORT_STATUS_DHPD_HPD_STATUS_ASSERT) + pmc_usb_mux_dp_hpd(port, &data); + msg[0] = PMC_USB_DISCONNECT; msg[0] |= port->usb3_port << PMC_USB_MSG_USB3_PORT_SHIFT; @@ -309,6 +345,11 @@ static int pmc_usb_mux_set(struct typec_mux *mux, struct typec_mux_state *state) { struct pmc_usb_port *port = typec_mux_get_drvdata(mux); + int ret; + + ret = intel_iom_port_status(port->pmc->iom, port->num, &port->iom_status); + if (ret) + return ret; if (state->mode == TYPEC_STATE_SAFE) return pmc_usb_mux_safe_state(port); @@ -341,9 +382,11 @@ static int pmc_usb_set_orientation(struct typec_switch *sw, enum typec_orientation orientation) { struct pmc_usb_port *port = typec_switch_get_drvdata(sw); + int ret; - if (port->orientation == orientation) - return 0; + ret = intel_iom_port_status(port->pmc->iom, port->num, &port->iom_status); + if (ret) + return ret; port->orientation = orientation; @@ -360,9 +403,11 @@ static int pmc_usb_set_orientation(struct typec_switch *sw, static int pmc_usb_set_role(struct usb_role_switch *sw, enum usb_role role) { struct pmc_usb_port *port = usb_role_switch_get_drvdata(sw); + int ret; - if (port->role == role) - return 0; + ret = intel_iom_port_status(port->pmc->iom, port->num, &port->iom_status); + if (ret) + return ret; port->role = role; @@ -472,6 +517,10 @@ static int pmc_usb_probe(struct platform_device *pdev) pmc->dev = &pdev->dev; + pmc->iom = intel_iom_get(); + if (IS_ERR(pmc->iom)) + return PTR_ERR(pmc->iom); + /* * For every physical USB connector (USB2 and USB3 combo) there is a * child ACPI device node under the PMC mux ACPI device object. @@ -496,6 +545,8 @@ static int pmc_usb_probe(struct platform_device *pdev) typec_mux_unregister(pmc->port[i].typec_mux); } + intel_iom_put(pmc->iom); + return ret; } @@ -509,6 +560,8 @@ static int pmc_usb_remove(struct platform_device *pdev) typec_mux_unregister(pmc->port[i].typec_mux); } + intel_iom_put(pmc->iom); + return 0; }