From patchwork Fri Jun 21 06:12:31 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "(Exiting) Baolin Wang" X-Patchwork-Id: 11008467 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 9F47C1395 for ; Fri, 21 Jun 2019 06:13:11 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 8FE33289C2 for ; Fri, 21 Jun 2019 06:13:11 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 83B00289D0; Fri, 21 Jun 2019 06:13:11 +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=-8.0 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,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 A7314289C2 for ; Fri, 21 Jun 2019 06:13:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726264AbfFUGMy (ORCPT ); Fri, 21 Jun 2019 02:12:54 -0400 Received: from mail-pl1-f196.google.com ([209.85.214.196]:45937 "EHLO mail-pl1-f196.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725911AbfFUGMx (ORCPT ); Fri, 21 Jun 2019 02:12:53 -0400 Received: by mail-pl1-f196.google.com with SMTP id bi6so2453368plb.12 for ; Thu, 20 Jun 2019 23:12:53 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :in-reply-to:references; bh=7nHW+SBzX1vnb4mk1MDf9lGhalkNUllPIWRi8UNhM/c=; b=osCAdvXZJmd8s32WoaH84e0LvoQF3n8quJaSrFXXcZI2cepOsKaYqkZhdXl6Hipp1t MNT21Hkn6pag47WU/b70key5vgzuhiyEbIyDFj7NUoKIwA4nVoTsgAr1LbAvE1e9580o ojwN0FXPZn+ZwbFGBZaWJBlmoykMq8Y3IfDCrdn4Lje8NGTdaAn4Zu0K3ZaBj3ngMSzd 5heMfR7ve4WTUcKdL3TLMPPguf7EzfTIJCi6nJQkpc5I3ja4gL7elfXltWm2OukUep48 KQ6bedBrVvRAxuX0n+NXZV/uHEmz1LzGOWHDLYMm/iBXQpWgyeU+VJJSgISWBjEFC1++ gMwQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:in-reply-to:references; bh=7nHW+SBzX1vnb4mk1MDf9lGhalkNUllPIWRi8UNhM/c=; b=Z+GpQzvwq/zrru8i5pMmSTFGX5yjc4xOrQ+fYdhipIKGeoxLpUQUSLJIRCtniItkX3 SRrgH4puCcft4I92UDhA5kPkzQNOzgJqcKf1XYTRk1GrlrPxFl1H3v1QytkB9kdM8Piv VzFTFQJkJDWySUJ2RxzzEKyvbHmLMEfO/Tck2299n3xNqWn/PqTWsOcfvkg1+c+P1mZb 6Jf6jGQf9wlrl/Y/bFQxIYbXGZH1yTZys1RL1ZLHm36Khk1MtqI0iGmnZpUKAOV+sp7+ sOSm4L8G+NxXz9xZHKUoLHhRK2Nb5AbbLweutGdrp+yU07Jdmdb0YVSB3FynbX1QBlkw lLbA== X-Gm-Message-State: APjAAAU34PDyvU+sDZHG40lN6+B4WaQ5pZYlEAB0/Mw04n6zytnoWYqK N+GTeWNBnyGaH8w7UTPBoGXXlQ== X-Google-Smtp-Source: APXvYqzV1QMcGWKHcO3GJFszFvYHtJaXinkBiAsjKQeNI5kSsCCcFHT5+Hm1oVT9CT+LJc1z8sKSjg== X-Received: by 2002:a17:902:7583:: with SMTP id j3mr11377956pll.196.1561097573451; Thu, 20 Jun 2019 23:12:53 -0700 (PDT) Received: from baolinwangubtpc.spreadtrum.com ([117.18.48.82]) by smtp.gmail.com with ESMTPSA id x7sm1266134pfm.82.2019.06.20.23.12.50 (version=TLS1 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Thu, 20 Jun 2019 23:12:53 -0700 (PDT) From: Baolin Wang To: adrian.hunter@intel.com, ulf.hansson@linaro.org, zhang.lyra@gmail.com, orsonzhai@gmail.com, robh+dt@kernel.org, mark.rutland@arm.com Cc: baolin.wang@linaro.org, vincent.guittot@linaro.org, linux-mmc@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org Subject: [PATCH 1/3] mmc: sdhci-sprd: Add start_signal_voltage_switch ops Date: Fri, 21 Jun 2019 14:12:31 +0800 Message-Id: <89fb15e88f33a3c1ce7b5eefa9414a20c984c579.1561094029.git.baolin.wang@linaro.org> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: References: In-Reply-To: References: 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 For Spreadtrum SD host controller, we can not use standard SD registers to change and detect the I/O voltage signals, since our voltage regulator for I/O is fixed in hardware, and no signals were connected to the SD controller. Thus add Spreadtrum specific voltage switch ops to change voltage instead of using standard SD host registers. Signed-off-by: Baolin Wang Acked-by: Adrian Hunter --- drivers/mmc/host/sdhci-sprd.c | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) diff --git a/drivers/mmc/host/sdhci-sprd.c b/drivers/mmc/host/sdhci-sprd.c index 024c3c5..8b23c88 100644 --- a/drivers/mmc/host/sdhci-sprd.c +++ b/drivers/mmc/host/sdhci-sprd.c @@ -403,6 +403,22 @@ static void sdhci_sprd_request(struct mmc_host *mmc, struct mmc_request *mrq) sdhci_request(mmc, mrq); } +static int sdhci_sprd_voltage_switch(struct mmc_host *mmc, struct mmc_ios *ios) +{ + int ret; + + if (!IS_ERR(mmc->supply.vqmmc)) { + ret = mmc_regulator_set_vqmmc(mmc, ios); + if (ret) { + pr_err("%s: Switching signalling voltage failed\n", + mmc_hostname(mmc)); + return ret; + } + } + + return 0; +} + static void sdhci_sprd_hs400_enhanced_strobe(struct mmc_host *mmc, struct mmc_ios *ios) { @@ -470,6 +486,14 @@ static int sdhci_sprd_probe(struct platform_device *pdev) host->mmc_host_ops.request = sdhci_sprd_request; host->mmc_host_ops.hs400_enhanced_strobe = sdhci_sprd_hs400_enhanced_strobe; + /* + * We can not use the standard ops to change and detect the voltage + * signal for Spreadtrum SD host controller, since our voltage regulator + * for I/O is fixed in hardware, that means we do not need control + * the standard SD host controller to change the I/O voltage. + */ + host->mmc_host_ops.start_signal_voltage_switch = + sdhci_sprd_voltage_switch; host->mmc->caps = MMC_CAP_SD_HIGHSPEED | MMC_CAP_MMC_HIGHSPEED | MMC_CAP_ERASE | MMC_CAP_CMD23;