From patchwork Sat Oct 8 11:59:37 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Winkler, Tomas" X-Patchwork-Id: 9368117 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 6310760487 for ; Sat, 8 Oct 2016 12:01:55 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 542C9298B3 for ; Sat, 8 Oct 2016 12:01:55 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 492FD298B4; Sat, 8 Oct 2016 12:01:55 +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 CC9042998E for ; Sat, 8 Oct 2016 12:01:54 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=sfs-ml-2.v29.ch3.sourceforge.com) by sfs-ml-2.v29.ch3.sourceforge.com with esmtp (Exim 4.76) (envelope-from ) id 1bsqK9-0006LQ-BR; Sat, 08 Oct 2016 12:01:53 +0000 Received: from sog-mx-1.v43.ch3.sourceforge.com ([172.29.43.191] helo=mx.sourceforge.net) by sfs-ml-2.v29.ch3.sourceforge.com with esmtp (Exim 4.76) (envelope-from ) id 1bsqK7-0006LF-Mg for tpmdd-devel@lists.sourceforge.net; Sat, 08 Oct 2016 12:01:51 +0000 Received-SPF: fail (sog-mx-1.v43.ch3.sourceforge.com: domain of intel.com does not designate 192.55.52.120 as permitted sender) client-ip=192.55.52.120; envelope-from=tomas.winkler@intel.com; helo=mga04.intel.com; Received: from mga04.intel.com ([192.55.52.120]) by sog-mx-1.v43.ch3.sourceforge.com with esmtps (TLSv1:AES256-SHA:256) (Exim 4.76) id 1bsqK6-0002zy-QY for tpmdd-devel@lists.sourceforge.net; Sat, 08 Oct 2016 12:01:51 +0000 Received: from fmsmga004.fm.intel.com ([10.253.24.48]) by fmsmga104.fm.intel.com with ESMTP; 08 Oct 2016 05:01:45 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.31,460,1473145200"; d="scan'208";a="177833740" Received: from twinkler-lnx.jer.intel.com ([10.12.87.167]) by fmsmga004.fm.intel.com with ESMTP; 08 Oct 2016 05:01:43 -0700 From: Tomas Winkler To: tpmdd-devel@lists.sourceforge.net, Jason Gunthorpe , Jarkko Sakkinen Date: Sat, 8 Oct 2016 14:59:37 +0300 Message-Id: <1475927979-23484-3-git-send-email-tomas.winkler@intel.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1475927979-23484-1-git-send-email-tomas.winkler@intel.com> References: <1475927979-23484-1-git-send-email-tomas.winkler@intel.com> X-Headers-End: 1bsqK6-0002zy-QY Cc: linux-kernel@vger.kernel.org Subject: [tpmdd-devel] [PATCH 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 From: "Winkler, Tomas" There is a HW bug in Skylake, Kabylake, 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 --- V2: cmd read need to be called also before crb_init as this will run self test. V3: resend. V4: add Kabylake to the list of effected platforms 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 0f3b3f3d12d3..4eb96b85c653 100644 --- a/drivers/char/tpm/tpm_crb.c +++ b/drivers/char/tpm/tpm_crb.c @@ -319,6 +319,7 @@ 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; @@ -346,12 +347,27 @@ 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); @@ -359,7 +375,8 @@ 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 @@ -367,12 +384,18 @@ 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) @@ -416,7 +439,15 @@ 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)