From patchwork Mon Feb 11 13:23:40 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Petazzoni X-Patchwork-Id: 1039808 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=none (mailfrom) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=linux-tegra-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=bootlin.com Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 43ymjL0JgJz9sML for ; Tue, 12 Feb 2019 00:24:38 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727991AbfBKNYg (ORCPT ); Mon, 11 Feb 2019 08:24:36 -0500 Received: from relay3-d.mail.gandi.net ([217.70.183.195]:60085 "EHLO relay3-d.mail.gandi.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727566AbfBKNYf (ORCPT ); Mon, 11 Feb 2019 08:24:35 -0500 X-Originating-IP: 90.88.22.177 Received: from localhost (aaubervilliers-681-1-80-177.w90-88.abo.wanadoo.fr [90.88.22.177]) (Authenticated sender: thomas.petazzoni@bootlin.com) by relay3-d.mail.gandi.net (Postfix) with ESMTPSA id B22B56000F; Mon, 11 Feb 2019 13:24:31 +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, Faiz Abbas , Thomas Petazzoni Subject: [PATCH v2 1/3] mmc: sdhci: use WP GPIO in sdhci_check_ro() Date: Mon, 11 Feb 2019 14:23:40 +0100 Message-Id: <20190211132342.31009-2-thomas.petazzoni@bootlin.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190211132342.31009-1-thomas.petazzoni@bootlin.com> References: <20190211132342.31009-1-thomas.petazzoni@bootlin.com> MIME-Version: 1.0 Sender: linux-tegra-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-tegra@vger.kernel.org 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. We need to adjust the prototype of the function to use a mmc_host* as argument instead of sdhci_host*, since the mmc_can_gpio_ro() and mmc_gpio_get_ro() helpers take a mmc_host*. Signed-off-by: Thomas Petazzoni --- 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 | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c index df05352b6a4a..e6682ea5f7c0 100644 --- a/drivers/mmc/host/sdhci.c +++ b/drivers/mmc/host/sdhci.c @@ -2022,8 +2022,9 @@ static int sdhci_get_cd(struct mmc_host *mmc) return !!(sdhci_readl(host, SDHCI_PRESENT_STATE) & SDHCI_CARD_PRESENT); } -static int sdhci_check_ro(struct sdhci_host *host) +static int sdhci_check_ro(struct mmc_host *mmc) { + struct sdhci_host *host = mmc_priv(mmc); unsigned long flags; int is_readonly; @@ -2033,6 +2034,8 @@ 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(mmc)) + is_readonly = mmc_gpio_get_ro(mmc); else is_readonly = !(sdhci_readl(host, SDHCI_PRESENT_STATE) & SDHCI_WRITE_PROTECT); @@ -2052,11 +2055,11 @@ static int sdhci_get_ro(struct mmc_host *mmc) int i, ro_count; if (!(host->quirks & SDHCI_QUIRK_UNSTABLE_RO_DETECT)) - return sdhci_check_ro(host); + return sdhci_check_ro(mmc); ro_count = 0; for (i = 0; i < SAMPLE_COUNT; i++) { - if (sdhci_check_ro(host)) { + if (sdhci_check_ro(mmc)) { if (++ro_count > SAMPLE_COUNT / 2) return 1; }