From patchwork Thu Jan 10 17:58:45 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lubomir Rintel X-Patchwork-Id: 10756515 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id EF9F51399 for ; Thu, 10 Jan 2019 17:59:28 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id DFE2B29B1A for ; Thu, 10 Jan 2019 17:59:28 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id D380D29B6C; Thu, 10 Jan 2019 17:59:28 +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=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 25A7629B1A for ; Thu, 10 Jan 2019 17:59:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730835AbfAJR70 (ORCPT ); Thu, 10 Jan 2019 12:59:26 -0500 Received: from shell.v3.sk ([90.176.6.54]:58610 "EHLO shell.v3.sk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730703AbfAJR7Y (ORCPT ); Thu, 10 Jan 2019 12:59:24 -0500 Received: from localhost (localhost [127.0.0.1]) by zimbra.v3.sk (Postfix) with ESMTP id E88C61002F1; Thu, 10 Jan 2019 18:59:20 +0100 (CET) Received: from shell.v3.sk ([127.0.0.1]) by localhost (zimbra.v3.sk [127.0.0.1]) (amavisd-new, port 10032) with ESMTP id CjwEAdZ_cx2t; Thu, 10 Jan 2019 18:59:08 +0100 (CET) Received: from localhost (localhost [127.0.0.1]) by zimbra.v3.sk (Postfix) with ESMTP id D67861002F0; Thu, 10 Jan 2019 18:59:01 +0100 (CET) X-Virus-Scanned: amavisd-new at zimbra.v3.sk Received: from shell.v3.sk ([127.0.0.1]) by localhost (zimbra.v3.sk [127.0.0.1]) (amavisd-new, port 10026) with ESMTP id goc6kLLtZsRL; Thu, 10 Jan 2019 18:58:59 +0100 (CET) Received: from belphegor.brq.redhat.com (nat-pool-brq-t.redhat.com [213.175.37.10]) by zimbra.v3.sk (Postfix) with ESMTPSA id DD7B11002FF; Thu, 10 Jan 2019 18:58:55 +0100 (CET) From: Lubomir Rintel To: Andy Shevchenko , Darren Hart Cc: Rob Herring , Russell King , Mark Rutland , platform-driver-x86@vger.kernel.org, linux-pm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Lubomir Rintel Subject: [PATCH v5 10/10] Platform: OLPC: Add restart support to XO-1.75 EC driver Date: Thu, 10 Jan 2019 18:58:45 +0100 Message-Id: <20190110175845.1203986-11-lkundrak@v3.sk> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190110175845.1203986-1-lkundrak@v3.sk> References: <20190110175845.1203986-1-lkundrak@v3.sk> MIME-Version: 1.0 Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This hooks to arm_pm_restart instead od utilizing a restart handler notifier, because the reboot dance on XO 1.75 needs to sleep (it pokes a GPIO and waits for the EC to initiate the command transaction) and the restart handler is called in atomic context. Sad. Signed-off-by: Lubomir Rintel --- Changes since v4: - Split off from the driver. drivers/platform/olpc/Kconfig | 2 +- drivers/platform/olpc/olpc-xo175-ec.c | 13 +++++++++++++ 2 files changed, 14 insertions(+), 1 deletion(-) diff --git a/drivers/platform/olpc/Kconfig b/drivers/platform/olpc/Kconfig index 858ac1d2290a..02b232c34444 100644 --- a/drivers/platform/olpc/Kconfig +++ b/drivers/platform/olpc/Kconfig @@ -4,7 +4,7 @@ config OLPC_EC config OLPC_XO175_EC tristate "OLPC XO 1.75 Embedded Controller" - depends on ARCH_MMP || COMPILE_TEST + depends on ARM && (ARCH_MMP || COMPILE_TEST) select SPI_SLAVE select OLPC_EC help diff --git a/drivers/platform/olpc/olpc-xo175-ec.c b/drivers/platform/olpc/olpc-xo175-ec.c index c3a176ce474d..74db06bacc44 100644 --- a/drivers/platform/olpc/olpc-xo175-ec.c +++ b/drivers/platform/olpc/olpc-xo175-ec.c @@ -23,6 +23,7 @@ #include #include #include +#include struct ec_cmd_t { u8 cmd; @@ -578,6 +579,14 @@ static int olpc_xo175_ec_set_event_mask(unsigned int mask) return olpc_ec_cmd(CMD_WRITE_EXT_SCI_MASK, args, 2, NULL, 0); } +static void olpc_xo175_ec_restart(enum reboot_mode mode, const char *cmd) +{ + while (1) { + olpc_ec_cmd(CMD_POWER_CYCLE, NULL, 0, NULL, 0); + mdelay(1000); + } +} + static void olpc_xo175_ec_power_off(void) { while (1) { @@ -649,6 +658,8 @@ static int olpc_xo175_ec_remove(struct spi_device *spi) { if (pm_power_off == olpc_xo175_ec_power_off) pm_power_off = NULL; + if (arm_pm_restart == olpc_xo175_ec_restart) + arm_pm_restart = NULL; spi_slave_abort(spi); @@ -716,6 +727,8 @@ static int olpc_xo175_ec_probe(struct spi_device *spi) if (pm_power_off == NULL) pm_power_off = olpc_xo175_ec_power_off; + if (arm_pm_restart == NULL) + arm_pm_restart = olpc_xo175_ec_restart; dev_info(&spi->dev, "OLPC XO-1.75 Embedded Controller driver\n");