From patchwork Tue Feb 12 14:07:35 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Petazzoni X-Patchwork-Id: 10808027 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 074AA13A4 for ; Tue, 12 Feb 2019 14:16:59 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id EA4F32B713 for ; Tue, 12 Feb 2019 14:16:58 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id DEAD82B939; Tue, 12 Feb 2019 14:16:58 +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 88C0F2B713 for ; Tue, 12 Feb 2019 14:16:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730147AbfBLOQ5 (ORCPT ); Tue, 12 Feb 2019 09:16:57 -0500 Received: from mslow2.mail.gandi.net ([217.70.178.242]:56864 "EHLO mslow2.mail.gandi.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730114AbfBLOQ5 (ORCPT ); Tue, 12 Feb 2019 09:16:57 -0500 Received: from relay12.mail.gandi.net (unknown [217.70.178.232]) by mslow2.mail.gandi.net (Postfix) with ESMTP id 1566F3A62EB; Tue, 12 Feb 2019 15:07:48 +0100 (CET) Received: from localhost (aaubervilliers-681-1-89-68.w90-88.abo.wanadoo.fr [90.88.30.68]) (Authenticated sender: thomas.petazzoni@bootlin.com) by relay12.mail.gandi.net (Postfix) with ESMTPSA id 534A920000C; Tue, 12 Feb 2019 14:07:43 +0000 (UTC) From: Thomas Petazzoni To: Adrian Hunter , Kishon Vijay Abraham I , Ulf Hansson , Thierry Reding , Jonathan Hunter Cc: linux-mmc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-tegra@vger.kernel.org, Gregory Clement , Thomas Petazzoni Subject: [PATCH v3 1/3] mmc: sdhci: use WP GPIO in sdhci_check_ro() Date: Tue, 12 Feb 2019 15:07:35 +0100 Message-Id: <20190212140737.8668-2-thomas.petazzoni@bootlin.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190212140737.8668-1-thomas.petazzoni@bootlin.com> References: <20190212140737.8668-1-thomas.petazzoni@bootlin.com> MIME-Version: 1.0 Sender: linux-mmc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-mmc@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Even though SDHCI controllers may have a dedicated WP pin that can be queried using the SDHCI_PRESENT_STATE register, some platforms may chose to use a separate regular GPIO to route the WP signal. Such a GPIO is typically represented using the wp-gpios property in the Device Tree. Unfortunately, the current sdhci_check_ro() function does not make use of such GPIO when available: it either uses a host controller specific ->get_ro() operation, or uses the SDHCI_PRESENT_STATE. Several host controller specific ->get_ro() functions are implemented just to check a WP GPIO state. Instead of pushing this to more controller-specific implementations, let's handle this in the core SDHCI code, just like it is already done for the CD GPIO in sdhci_get_cd(). The below patch simply changes sdhci_check_ro() to use the value of the WP GPIO if available. Signed-off-by: Thomas Petazzoni --- Changes since v2: - As suggested by Adrian Hunter, keep the argument of sdhci_check_ro() as it is: a "struct sdhci_host*" Changes since v1: - As suggested by Adrian Hunter, call the ->get_ro() if it exists before falling back to using mmc_gpio_get_ro(). Indeed, if the controller-specific code has implemented a ->get_ro() callback, it should take precedence over what the SDHCI core does. Due to this change, I have not added Thierry Redding Reviewed-by. - Fix typo in the commit log noticed by Thierry Redding. --- drivers/mmc/host/sdhci.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c index df05352b6a4a..b3444d12c8c8 100644 --- a/drivers/mmc/host/sdhci.c +++ b/drivers/mmc/host/sdhci.c @@ -2033,6 +2033,8 @@ static int sdhci_check_ro(struct sdhci_host *host) is_readonly = 0; else if (host->ops->get_ro) is_readonly = host->ops->get_ro(host); + else if (mmc_can_gpio_ro(host->mmc)) + is_readonly = mmc_gpio_get_ro(host->mmc); else is_readonly = !(sdhci_readl(host, SDHCI_PRESENT_STATE) & SDHCI_WRITE_PROTECT);