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=-19.7 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 52CF3C432BE for ; Tue, 24 Aug 2021 17:01:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3AA4E61506 for ; Tue, 24 Aug 2021 17:01:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239296AbhHXRCh (ORCPT ); Tue, 24 Aug 2021 13:02:37 -0400 Received: from mail.kernel.org ([198.145.29.99]:39904 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238928AbhHXQ7N (ORCPT ); Tue, 24 Aug 2021 12:59:13 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 0AF5861414; Tue, 24 Aug 2021 16:57:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1629824254; bh=rFWVkTbFx0XTXndnBQgZe6MHT/XWE9zLb9BHU1Gz09o=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=S2HJuLvJOMs4EkUk7hhdgLGUDpGuQ4Nrgm+6z+p0qfaYr0qI6fLCOdwng7REUyAUW pg1CmJBuCLqlNCVCIyin5DMP2Fwcj9gQd7WNRu4xgpEDkQQ+0nI8W4+YbLyptibmge UsnvDL1mvV2nRFUKfxbw6m7VF17ohmysKiM3Fu27D7Rjo+H9yn5zu1yfqs9+QGxNAJ TSuPW6VHNFmfcFvCz9GImlMhadOjdH+UFE0Y0l6h4H3SpWd+ALT4zSFGYcjsZAVZiw 5qilIaww42LzYC9IauWxLrD/E41niikaZQoI18dp2OQ5vGLIhXNjVJXylqwGZ0fVAd 0lvULDbbcUxGg== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Christophe Kerello , Yann Gautier , Ulf Hansson , Sasha Levin Subject: [PATCH 5.13 087/127] mmc: mmci: stm32: Check when the voltage switch procedure should be done Date: Tue, 24 Aug 2021 12:55:27 -0400 Message-Id: <20210824165607.709387-88-sashal@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210824165607.709387-1-sashal@kernel.org> References: <20210824165607.709387-1-sashal@kernel.org> MIME-Version: 1.0 X-KernelTest-Patch: http://kernel.org/pub/linux/kernel/v5.x/stable-review/patch-5.13.13-rc1.gz X-KernelTest-Tree: git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git X-KernelTest-Branch: linux-5.13.y X-KernelTest-Patches: git://git.kernel.org/pub/scm/linux/kernel/git/stable/stable-queue.git X-KernelTest-Version: 5.13.13-rc1 X-KernelTest-Deadline: 2021-08-26T16:55+00:00 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Christophe Kerello [ Upstream commit d8e193f13b07e6c0ffaa1a999386f1989f2b4c5e ] If the card has not been power cycled, it may still be using 1.8V signaling. This situation is detected in mmc_sd_init_card function and should be handled in mmci stm32 variant. The host->pwr_reg variable is also correctly protected with spin locks. Fixes: 94b94a93e355 ("mmc: mmci_sdmmc: Implement signal voltage callbacks") Signed-off-by: Christophe Kerello Signed-off-by: Yann Gautier Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20210701143353.13188-1-yann.gautier@foss.st.com Signed-off-by: Ulf Hansson Signed-off-by: Sasha Levin --- drivers/mmc/host/mmci_stm32_sdmmc.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/drivers/mmc/host/mmci_stm32_sdmmc.c b/drivers/mmc/host/mmci_stm32_sdmmc.c index 51db30acf4dc..fdaa11f92fe6 100644 --- a/drivers/mmc/host/mmci_stm32_sdmmc.c +++ b/drivers/mmc/host/mmci_stm32_sdmmc.c @@ -479,8 +479,9 @@ static int sdmmc_post_sig_volt_switch(struct mmci_host *host, u32 status; int ret = 0; - if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_180) { - spin_lock_irqsave(&host->lock, flags); + spin_lock_irqsave(&host->lock, flags); + if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_180 && + host->pwr_reg & MCI_STM32_VSWITCHEN) { mmci_write_pwrreg(host, host->pwr_reg | MCI_STM32_VSWITCH); spin_unlock_irqrestore(&host->lock, flags); @@ -492,9 +493,11 @@ static int sdmmc_post_sig_volt_switch(struct mmci_host *host, writel_relaxed(MCI_STM32_VSWENDC | MCI_STM32_CKSTOPC, host->base + MMCICLEAR); + spin_lock_irqsave(&host->lock, flags); mmci_write_pwrreg(host, host->pwr_reg & ~(MCI_STM32_VSWITCHEN | MCI_STM32_VSWITCH)); } + spin_unlock_irqrestore(&host->lock, flags); return ret; } -- 2.30.2