From patchwork Mon Sep 12 13:04:19 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Winkler, Tomas" X-Patchwork-Id: 9326463 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 3B7116048B for ; Mon, 12 Sep 2016 13:06:45 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 25861280D0 for ; Mon, 12 Sep 2016 13:06:45 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 1A5F0285B8; Mon, 12 Sep 2016 13:06:45 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from lists.sourceforge.net (lists.sourceforge.net [216.34.181.88]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 0CF3028DB0 for ; Mon, 12 Sep 2016 13:06:38 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=sfs-ml-4.v29.ch3.sourceforge.com) by sfs-ml-4.v29.ch3.sourceforge.com with esmtp (Exim 4.76) (envelope-from ) id 1bjQwW-0001Wu-W6; Mon, 12 Sep 2016 13:06:36 +0000 Received: from sog-mx-2.v43.ch3.sourceforge.com ([172.29.43.192] helo=mx.sourceforge.net) by sfs-ml-4.v29.ch3.sourceforge.com with esmtp (Exim 4.76) (envelope-from ) id 1bjQwW-0001Wl-En for tpmdd-devel@lists.sourceforge.net; Mon, 12 Sep 2016 13:06:36 +0000 Received-SPF: pass (sog-mx-2.v43.ch3.sourceforge.com: domain of intel.com designates 134.134.136.65 as permitted sender) client-ip=134.134.136.65; envelope-from=tomas.winkler@intel.com; helo=mga03.intel.com; Received: from mga03.intel.com ([134.134.136.65]) by sog-mx-2.v43.ch3.sourceforge.com with esmtps (TLSv1:AES256-SHA:256) (Exim 4.76) id 1bjQwQ-00017c-UK for tpmdd-devel@lists.sourceforge.net; Mon, 12 Sep 2016 13:06:36 +0000 Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by orsmga103.jf.intel.com with ESMTP; 12 Sep 2016 06:06:27 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.30,322,1470726000"; d="scan'208";a="7328843" Received: from twinkler-lnx.jer.intel.com ([10.12.87.167]) by fmsmga005.fm.intel.com with ESMTP; 12 Sep 2016 06:06:25 -0700 From: Tomas Winkler To: tpmdd-devel@lists.sourceforge.net, Jason Gunthorpe , Jarkko Sakkinen Date: Mon, 12 Sep 2016 16:04:19 +0300 Message-Id: <1473685461-6540-3-git-send-email-tomas.winkler@intel.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1473685461-6540-1-git-send-email-tomas.winkler@intel.com> References: <1473685461-6540-1-git-send-email-tomas.winkler@intel.com> X-Headers-End: 1bjQwQ-00017c-UK Cc: linux-kernel@vger.kernel.org Subject: [tpmdd-devel] [PATCH v3 2/4] tmp/tpm_crb: fix Intel PTT hw bug during idle state X-BeenThere: tpmdd-devel@lists.sourceforge.net X-Mailman-Version: 2.1.9 Precedence: list List-Id: Tpm Device Driver maintainance List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Errors-To: tpmdd-devel-bounces@lists.sourceforge.net X-Virus-Scanned: ClamAV using ClamSMTP There is a HW bug in Skylake, and Broxton PCH Intel PTT device, where most of the registers in the control area except START, REQUEST, CANCEL, and LOC_CTRL lost retention when the device is in the idle state. Hence we need to bring the device to ready state before accessing the other registers. The fix brings device to ready state before trying to read command and response buffer addresses in order to remap the for access. Signed-off-by: Tomas Winkler Tested-by: Jarkko Sakkinen Reviewed-by: Jarkko Sakkinen --- V2: cmd read need to be called also before crb_init as this will run self test. V3: resend. drivers/char/tpm/tpm_crb.c | 47 ++++++++++++++++++++++++++++++++++++++-------- 1 file changed, 39 insertions(+), 8 deletions(-) diff --git a/drivers/char/tpm/tpm_crb.c b/drivers/char/tpm/tpm_crb.c index b6923a8b3ff7..e945177cf2c8 100644 --- a/drivers/char/tpm/tpm_crb.c +++ b/drivers/char/tpm/tpm_crb.c @@ -318,6 +318,7 @@ static int crb_map_io(struct acpi_device *device, struct crb_priv *priv, struct list_head resources; struct resource io_res; struct device *dev = &device->dev; + u32 pa_high, pa_low; u64 cmd_pa; u32 cmd_size; u64 rsp_pa; @@ -345,12 +346,27 @@ static int crb_map_io(struct acpi_device *device, struct crb_priv *priv, if (IS_ERR(priv->cca)) return PTR_ERR(priv->cca); - cmd_pa = ((u64) ioread32(&priv->cca->cmd_pa_high) << 32) | - (u64) ioread32(&priv->cca->cmd_pa_low); + /* + * PTT HW bug w/a: wake up the device to access + * possibly not retained registers. + */ + ret = crb_cmd_ready(dev, priv); + if (ret) + return ret; + + pa_high = ioread32(&priv->cca->cmd_pa_high); + pa_low = ioread32(&priv->cca->cmd_pa_low); + cmd_pa = ((u64)pa_high << 32) | pa_low; cmd_size = ioread32(&priv->cca->cmd_size); + + dev_dbg(dev, "cmd_hi = %X cmd_low = %X cmd_size %X\n", + pa_high, pa_low, cmd_size); + priv->cmd = crb_map_res(dev, priv, &io_res, cmd_pa, cmd_size); - if (IS_ERR(priv->cmd)) - return PTR_ERR(priv->cmd); + if (IS_ERR(priv->cmd)) { + ret = PTR_ERR(priv->cmd); + goto out; + } memcpy_fromio(&rsp_pa, &priv->cca->rsp_pa, 8); rsp_pa = le64_to_cpu(rsp_pa); @@ -358,7 +374,8 @@ static int crb_map_io(struct acpi_device *device, struct crb_priv *priv, if (cmd_pa != rsp_pa) { priv->rsp = crb_map_res(dev, priv, &io_res, rsp_pa, rsp_size); - return PTR_ERR_OR_ZERO(priv->rsp); + ret = PTR_ERR_OR_ZERO(priv->rsp); + goto out; } /* According to the PTP specification, overlapping command and response @@ -366,12 +383,18 @@ static int crb_map_io(struct acpi_device *device, struct crb_priv *priv, */ if (cmd_size != rsp_size) { dev_err(dev, FW_BUG "overlapping command and response buffer sizes are not identical"); - return -EINVAL; + ret = -EINVAL; + goto out; } + priv->cmd_size = cmd_size; priv->rsp = priv->cmd; - return 0; + +out: + crb_go_idle(dev, priv); + + return ret; } static int crb_acpi_add(struct acpi_device *device) @@ -415,7 +438,15 @@ static int crb_acpi_add(struct acpi_device *device) if (rc) return rc; - return crb_init(device, priv); + rc = crb_cmd_ready(dev, priv); + if (rc) + return rc; + + rc = crb_init(device, priv); + if (rc) + crb_go_idle(dev, priv); + + return rc; } static int crb_acpi_remove(struct acpi_device *device)