From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 51807C43387 for ; Wed, 16 Jan 2019 13:01:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 22D51206C2 for ; Wed, 16 Jan 2019 13:01:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2392944AbfAPNBF (ORCPT ); Wed, 16 Jan 2019 08:01:05 -0500 Received: from mga11.intel.com ([192.55.52.93]:48500 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2392922AbfAPNBF (ORCPT ); Wed, 16 Jan 2019 08:01:05 -0500 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga006.fm.intel.com ([10.253.24.20]) by fmsmga102.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 16 Jan 2019 05:01:04 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.56,486,1539673200"; d="scan'208";a="310893602" Received: from ahunter-desktop.fi.intel.com (HELO [10.237.72.56]) ([10.237.72.56]) by fmsmga006.fm.intel.com with ESMTP; 16 Jan 2019 05:01:01 -0800 Subject: Re: [PATCH 1/3] mmc: sdhci: use WP GPIO in sdhci_check_ro() To: Thomas Petazzoni , 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 References: <20190115162837.5399-1-thomas.petazzoni@bootlin.com> <20190115162837.5399-2-thomas.petazzoni@bootlin.com> From: Adrian Hunter Organization: Intel Finland Oy, Registered Address: PL 281, 00181 Helsinki, Business Identity Code: 0357606 - 4, Domiciled in Helsinki Message-ID: Date: Wed, 16 Jan 2019 14:59:32 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.4.0 MIME-Version: 1.0 In-Reply-To: <20190115162837.5399-2-thomas.petazzoni@bootlin.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 15/01/19 6:28 PM, Thomas Petazzoni wrote: > 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 use > 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*. Why not just use host->mmc > > Signed-off-by: Thomas Petazzoni > --- > 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..63cc4bd033b9 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; > > @@ -2031,6 +2032,8 @@ static int sdhci_check_ro(struct sdhci_host *host) > > if (host->flags & SDHCI_DEVICE_DEAD) > is_readonly = 0; > + else if (mmc_can_gpio_ro(mmc)) > + is_readonly = mmc_gpio_get_ro(mmc); Perhaps host->ops->get_ro should be checked before mmc_can_gpio_ro()? > else if (host->ops->get_ro) > is_readonly = host->ops->get_ro(host); > else > @@ -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; > } >