From patchwork Thu Sep 5 10:19:49 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Victor Shih X-Patchwork-Id: 826824 Received: from mail-pf1-f176.google.com (mail-pf1-f176.google.com [209.85.210.176]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9B87C19B3CE; Thu, 5 Sep 2024 10:20:53 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.176 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725531655; cv=none; b=EWrTo/5Y3mITeKpVuyzOM3neGfLwkAQS7mdx3Irc6P9Gf0STNXmvEpSnleKaXOu7Eb5CoHMtXExcPnniciFnDPWcnf/9ppulYIakYeqhIfVXUq5JbnoSKNT5b+kNyYguBU0G0fllhfjxowHvx/70kn4NkpU/k7IwKlyIM9vsaQc= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725531655; c=relaxed/simple; bh=tNWL2yxo2uDQa0iyKVclsZm+e2qhVUxxzq34g14C8ts=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=DtzdPUcde+rl9DN+tNi9xQqsi2TPs73hNEHZSC/xZB3OZXEuRltHQQnER43v8wZC7fNE1FiDNDsL9FQs9qaImo4RJizVKoQtV2S0VSlmOeRyyS4dr7DL+Ez3LS9goFipq3JZ9an9IKBC2nZzQeVqLHwXCOLMrHuyVibg8VNj2QY= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=bApjoL1E; arc=none smtp.client-ip=209.85.210.176 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="bApjoL1E" Received: by mail-pf1-f176.google.com with SMTP id d2e1a72fcca58-714226888dfso470991b3a.1; Thu, 05 Sep 2024 03:20:53 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1725531653; x=1726136453; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=2u5k+9P7fnLwaL1GZATBK9ZKcQNGMTg+CrJ1EQReTio=; b=bApjoL1EQ/ySMZHNzz2FrnXAndj1ksiBDJoatO+sYGycm5UNhcWPkuxVx1XDbhNQY3 ZOyexvxuJrBFvdJFanLI1mR9X/tBpknAdCP1RC5HWcREH+iVK9Y8breYRY4aYr2z6P3A URA0dhXiTQ7qJmUpg/j/+HM5o7Hq351sF5msROmBKuodOhpHEJdxvEWaybBy8wBAVUSu o40px0oAp9A3mWdr47ANPi5hW2sPQ1jVHn4fFIMXswPYB8LP9MUoc5ELRCTJM8swWVP8 2SnpQo4eyTOS6NGkgFSWcZod2usLG+RK0A8ylSdKorcA2R+lQj3ikLRhciVRDggayb5G vgEw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1725531653; x=1726136453; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=2u5k+9P7fnLwaL1GZATBK9ZKcQNGMTg+CrJ1EQReTio=; b=l51c7yu2fDAAOQcMnlQIYa4RahgGjR/o4j5CNK3FAiiWA+4T/RhxEqcVmxZUA6Nqnc G2tcirdrgMqc4HcvwFtvAhICG3EWBaLA3UglyNF7o+JPqCLTxVgtAknlYyrVKXEQQBvg 0Mh1RmXGz1BMMHULTpkE25hs9oUrib2PKRJuW9CWq+rssAwsKiIPUykg3V9ICxwHo7Yb g1T3tOS3hGRFtSYyVofkVRYRKZpkOfJpMjMNB1CJVrWPsGqOMdyjBAwX8wx945GGiOz9 KLDTgXBjK9aOrx6bM3PsFnFnU3LZr9V0KEQLguXz1wiZP+FgIKBE0l1HhZTEIkUL5Avt 8eLw== X-Forwarded-Encrypted: i=1; AJvYcCWYvj/B8gFECdYi+3vMNaZ0hkF6vLAgGqffbFAYd49yn/MCjdALNKmYKpeaJwb9Uhj86uqwzZGLw8fYql8=@vger.kernel.org X-Gm-Message-State: AOJu0YyE1zSWs4vI6i7G3pRJstLJlnSowhQZftUajYo0b4RhrKAMO+/k IQtpK+b6SfjXbfiRWMv3enWOZWtGv/8BnIUC4gTzWrMe7fVsZcg322ClCkpN X-Google-Smtp-Source: AGHT+IHdVbjH5ybtVkFEOZz1egMiiZh5tR1ekjmDIp05QXA3dfTHUIGqi4pYabzdpygX/VKPUNpnVg== X-Received: by 2002:a05:6a21:3946:b0:1ce:cb6e:5e00 with SMTP id adf61e73a8af0-1cecb6e6010mr17503315637.50.1725531653065; Thu, 05 Sep 2024 03:20:53 -0700 (PDT) Received: from localhost.localdomain ([2402:7500:569:244d:9999:a704:87a3:25c6]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-206aea3855asm25979245ad.144.2024.09.05.03.20.48 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 05 Sep 2024 03:20:52 -0700 (PDT) From: Victor Shih To: ulf.hansson@linaro.org, adrian.hunter@intel.com Cc: linux-mmc@vger.kernel.org, linux-kernel@vger.kernel.org, benchuanggli@gmail.com, Lucas.Lai@genesyslogic.com.tw, HL.Liu@genesyslogic.com.tw, Greg.tu@genesyslogic.com.tw, dlunev@chromium.org, Victor Shih , Ben Chuang , AKASHI Takahiro , Victor Shih Subject: [PATCH V20 11/22] mmc: sdhci-uhs2: add reset function Date: Thu, 5 Sep 2024 18:19:49 +0800 Message-Id: <20240905102000.5020-12-victorshihgli@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20240905102000.5020-1-victorshihgli@gmail.com> References: <20240905102000.5020-1-victorshihgli@gmail.com> Precedence: bulk X-Mailing-List: linux-mmc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Victor Shih Sdhci_uhs2_reset() does a UHS-II specific reset operation. Signed-off-by: Ben Chuang Signed-off-by: AKASHI Takahiro Signed-off-by: Victor Shih --- Updates in V17: - Move the sdhci_uhs2_reset_cmd_data() to the other patch it was used for the first time. Updates in V16: - Add sdhci_uhs2_reset_cmd_data() function. Updates in V15: - Refer the SD Host Controller Standard Specification Section 3.10 to add reset command data mechanism. Updates in V14: - Since mmc_card_uhs2() is the same as sdhci_uhs2_mode(), so drop sdhci_uhs2_mode() and use mmc_card_uhs2() instead of sdhci_uhs2_mode(). Updates in V13: - Use ios timing to stead MMC_UHS2_SUPPORT for indicate the UHS2 mode. Updates in V8: - Adjust the position of matching brackets. Updates in V6: - Remove unnecessary functions and simplify code. --- drivers/mmc/host/sdhci-uhs2.c | 37 +++++++++++++++++++++++++++++++++++ drivers/mmc/host/sdhci-uhs2.h | 1 + 2 files changed, 38 insertions(+) diff --git a/drivers/mmc/host/sdhci-uhs2.c b/drivers/mmc/host/sdhci-uhs2.c index 9cb0f1b2a37d..3d16f1ef9344 100644 --- a/drivers/mmc/host/sdhci-uhs2.c +++ b/drivers/mmc/host/sdhci-uhs2.c @@ -10,7 +10,9 @@ * Author: AKASHI Takahiro */ +#include #include +#include #include "sdhci.h" #include "sdhci-uhs2.h" @@ -21,6 +23,8 @@ #define SDHCI_UHS2_DUMP(f, x...) \ pr_err("%s: " DRIVER_NAME ": " f, mmc_hostname(host->mmc), ## x) +#define UHS2_RESET_TIMEOUT_100MS 100000 + void sdhci_uhs2_dump_regs(struct sdhci_host *host) { if (!(mmc_card_uhs2(host->mmc))) @@ -49,6 +53,39 @@ void sdhci_uhs2_dump_regs(struct sdhci_host *host) } EXPORT_SYMBOL_GPL(sdhci_uhs2_dump_regs); +/*****************************************************************************\ + * * + * Low level functions * + * * +\*****************************************************************************/ + +/** + * sdhci_uhs2_reset - invoke SW reset + * @host: SDHCI host + * @mask: Control mask + * + * Invoke SW reset, depending on a bit in @mask and wait for completion. + */ +void sdhci_uhs2_reset(struct sdhci_host *host, u16 mask) +{ + u32 val; + + sdhci_writew(host, mask, SDHCI_UHS2_SW_RESET); + + if (mask & SDHCI_UHS2_SW_RESET_FULL) + host->clock = 0; + + /* hw clears the bit when it's done */ + if (read_poll_timeout_atomic(sdhci_readw, val, !(val & mask), 10, + UHS2_RESET_TIMEOUT_100MS, true, host, SDHCI_UHS2_SW_RESET)) { + pr_warn("%s: %s: Reset 0x%x never completed. %s: clean reset bit.\n", __func__, + mmc_hostname(host->mmc), (int)mask, mmc_hostname(host->mmc)); + sdhci_writeb(host, 0, SDHCI_UHS2_SW_RESET); + return; + } +} +EXPORT_SYMBOL_GPL(sdhci_uhs2_reset); + /*****************************************************************************\ * * * Driver init/exit * diff --git a/drivers/mmc/host/sdhci-uhs2.h b/drivers/mmc/host/sdhci-uhs2.h index 2bfe18d29bca..caaf9fba4975 100644 --- a/drivers/mmc/host/sdhci-uhs2.h +++ b/drivers/mmc/host/sdhci-uhs2.h @@ -177,5 +177,6 @@ struct sdhci_host; void sdhci_uhs2_dump_regs(struct sdhci_host *host); +void sdhci_uhs2_reset(struct sdhci_host *host, u16 mask); #endif /* __SDHCI_UHS2_H */