From patchwork Fri Mar 3 16:09:59 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Enric Balletbo i Serra X-Patchwork-Id: 735173 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org 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 ozlabs.org (Postfix) with ESMTPS id 3vZZ0H1GKMz9s5g for ; Sat, 4 Mar 2017 03:10:23 +1100 (AEDT) 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 1cjpmb-0006rF-BB; Fri, 03 Mar 2017 16:10:17 +0000 Received: from sog-mx-3.v43.ch3.sourceforge.com ([172.29.43.193] helo=mx.sourceforge.net) by sfs-ml-4.v29.ch3.sourceforge.com with esmtp (Exim 4.76) (envelope-from ) id 1cjpma-0006rA-Vn for tpmdd-devel@lists.sourceforge.net; Fri, 03 Mar 2017 16:10:17 +0000 Received-SPF: pass (sog-mx-3.v43.ch3.sourceforge.com: domain of collabora.com designates 46.235.227.227 as permitted sender) client-ip=46.235.227.227; envelope-from=enric.balletbo@collabora.com; helo=bhuna.collabora.co.uk; Received: from bhuna.collabora.co.uk ([46.235.227.227]) by sog-mx-3.v43.ch3.sourceforge.com with esmtps (TLSv1:AES256-SHA:256) (Exim 4.76) id 1cjpmZ-0007Cl-N5 for tpmdd-devel@lists.sourceforge.net; Fri, 03 Mar 2017 16:10:16 +0000 Received: from [127.0.0.1] (localhost [127.0.0.1]) (Authenticated sender: eballetbo) with ESMTPSA id DAF24266081 From: Enric Balletbo i Serra To: Rob Herring , Peter Huewe Date: Fri, 3 Mar 2017 17:09:59 +0100 Message-Id: <20170303160959.27422-1-enric.balletbo@collabora.com> X-Mailer: git-send-email 2.9.3 X-Spam-Score: -1.5 (-) X-Spam-Report: Spam Filtering performed by mx.sourceforge.net. See http://spamassassin.org/tag/ for more details. -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [46.235.227.227 listed in list.dnswl.org] -1.5 SPF_CHECK_PASS SPF reports sender host as permitted sender for sender-domain -0.0 SPF_HELO_PASS SPF: HELO matches SPF record -0.0 SPF_PASS SPF: sender matches SPF record 0.0 UNPARSEABLE_RELAY Informational: message has unparseable relay lines X-Headers-End: 1cjpmZ-0007Cl-N5 Cc: Mark Rutland , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, tpmdd-devel@lists.sourceforge.net, Sonny Rao Subject: [tpmdd-devel] [PATCH v3] tpm: do not suspend/resume if power stays on 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 From: Sonny Rao The suspend/resume behavior of the TPM can be controlled by setting "powered-while-suspended" in the DTS. This is useful for the cases when hardware does not power-off the TPM. Signed-off-by: Sonny Rao Signed-off-by: Enric Balletbo i Serra Reviewed-by: Jason Gunthorpe Reviewed-by: Jarkko Sakkinen Acked-by: Rob Herring --- Changes since v2: Jarkko Sakkinen - Add a new TPM_CHIP_FLAG_ALWAYS_POWERED flag instead of using a boolean variable. - Remove a trailing newline. Changes since v1: Jason Gunthorpe : - Move the code to handle suspend/resume in the common chip code. Documentation/devicetree/bindings/security/tpm/tpm-i2c.txt | 6 ++++++ drivers/char/tpm/tpm-interface.c | 3 +++ drivers/char/tpm/tpm.h | 1 + drivers/char/tpm/tpm_of.c | 3 +++ 4 files changed, 13 insertions(+) diff --git a/Documentation/devicetree/bindings/security/tpm/tpm-i2c.txt b/Documentation/devicetree/bindings/security/tpm/tpm-i2c.txt index 8cb638b..85c8216 100644 --- a/Documentation/devicetree/bindings/security/tpm/tpm-i2c.txt +++ b/Documentation/devicetree/bindings/security/tpm/tpm-i2c.txt @@ -8,6 +8,12 @@ Required properties: the firmware event log - linux,sml-size : size of the memory allocated for the firmware event log +Optional properties: + +- powered-while-suspended: present when the TPM is left powered on between + suspend and resume (makes the suspend/resume + callbacks do nothing). + Example (for OpenPower Systems with Nuvoton TPM 2.0 on I2C) ---------------------------------------------------------- diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c index a2688ac..6869093 100644 --- a/drivers/char/tpm/tpm-interface.c +++ b/drivers/char/tpm/tpm-interface.c @@ -944,6 +944,9 @@ int tpm_pm_suspend(struct device *dev) if (chip == NULL) return -ENODEV; + if (chip->flags & TPM_CHIP_FLAG_ALWAYS_POWERED) + return 0; + if (chip->flags & TPM_CHIP_FLAG_TPM2) { tpm2_shutdown(chip, TPM2_SU_STATE); return 0; diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h index 1ae9768..0ce379c 100644 --- a/drivers/char/tpm/tpm.h +++ b/drivers/char/tpm/tpm.h @@ -146,6 +146,7 @@ enum tpm_chip_flags { TPM_CHIP_FLAG_IRQ = BIT(2), TPM_CHIP_FLAG_VIRTUAL = BIT(3), TPM_CHIP_FLAG_HAVE_TIMEOUTS = BIT(4), + TPM_CHIP_FLAG_ALWAYS_POWERED = BIT(5), }; struct tpm_chip_seqops { diff --git a/drivers/char/tpm/tpm_of.c b/drivers/char/tpm/tpm_of.c index 7dee42d7..e89276c 100644 --- a/drivers/char/tpm/tpm_of.c +++ b/drivers/char/tpm/tpm_of.c @@ -34,6 +34,9 @@ int tpm_read_log_of(struct tpm_chip *chip) else return -ENODEV; + if (of_property_read_bool(np, "powered-while-suspended")) + chip->flags |= TPM_CHIP_FLAG_ALWAYS_POWERED; + sizep = of_get_property(np, "linux,sml-size", NULL); basep = of_get_property(np, "linux,sml-base", NULL); if (sizep == NULL && basep == NULL)