From patchwork Tue Jan 15 16:28:34 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Petazzoni X-Patchwork-Id: 10764821 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 7984F184E for ; Tue, 15 Jan 2019 16:29:39 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 69B6A2D189 for ; Tue, 15 Jan 2019 16:29:39 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 5E48D2D18E; Tue, 15 Jan 2019 16:29:39 +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 0EBA02D18A for ; Tue, 15 Jan 2019 16:29:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731500AbfAOQ3C (ORCPT ); Tue, 15 Jan 2019 11:29:02 -0500 Received: from mail.bootlin.com ([62.4.15.54]:57913 "EHLO mail.bootlin.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731482AbfAOQ3C (ORCPT ); Tue, 15 Jan 2019 11:29:02 -0500 Received: by mail.bootlin.com (Postfix, from userid 110) id 9787C209EF; Tue, 15 Jan 2019 17:28:59 +0100 (CET) Received: from localhost (aaubervilliers-681-1-37-87.w90-88.abo.wanadoo.fr [90.88.156.87]) by mail.bootlin.com (Postfix) with ESMTPSA id 69DBF20A7A; Tue, 15 Jan 2019 17:28:49 +0100 (CET) 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 0/3] Introduce support for WP GPIO in the core SDHCI Date: Tue, 15 Jan 2019 17:28:34 +0100 Message-Id: <20190115162837.5399-1-thomas.petazzoni@bootlin.com> X-Mailer: git-send-email 2.20.1 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 Hello, While doing the bring up of a Zynq 7000 platform where the WP signal of a SD slot is connected to a regular GPIO rather than through the SDHCI WP pin, I realized that the GPIO described by wp-gpios was properly requested, but it was in fact not used at all. Indeed, the SDHCI core implements sdhci_check_ro() by: - Calling a controller-specific ->get_ro() callback if it exists. A few controller-specific drivers implement this, but not sdhci-of-arasan, which is used on Zynq 7000. - Using the SDHCI_PRESENT_STATE register, which reports the state of the SDHCI interface WP pin, and obvisouly not the state of a separate WP GPIO. This patch series therefore changes sdhci_check_ro() to behave like sdhci_get_cd(): use a GPIO first if available, and if not, fallback to using the SDHCI_PRESENT_STATE register. Indeed, if there's a wp-gpios described in the DT, it quite certainly indicates that the SDHCI WP signal is not used, and the WP GPIO should be used instead. As part of this series, two SDHCI drivers are modified to no longer implement their custom ->get_ro() hook, since the core SDHCI now does the right thing with the WP GPIO. Best regards, Thomas Thomas Petazzoni (3): mmc: sdhci: use WP GPIO in sdhci_check_ro() mmc: sdhci-omap: drop ->get_ro() implementation mmc: sdhci-tegra: drop ->get_ro() implementation drivers/mmc/host/sdhci-omap.c | 1 - drivers/mmc/host/sdhci-tegra.c | 9 --------- drivers/mmc/host/sdhci.c | 9 ++++++--- 3 files changed, 6 insertions(+), 13 deletions(-)