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Wed, 18 Jan 2023 21:52:59 -0600 From: Brad Larson To: CC: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , Subject: [PATCH v9 14/15] mmc: sdhci-cadence: Support mmc hardware reset Date: Wed, 18 Jan 2023 19:51:35 -0800 Message-ID: <20230119035136.21603-15-blarson@amd.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20230119035136.21603-1-blarson@amd.com> References: <20230119035136.21603-1-blarson@amd.com> MIME-Version: 1.0 X-Originating-IP: [10.180.168.240] X-ClientProxiedBy: SATLEXMB03.amd.com (10.181.40.144) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CO1NAM11FT042:EE_|CY8PR12MB7634:EE_ X-MS-Office365-Filtering-Correlation-Id: 32efbb21-267e-4d7a-37b6-08daf9d0aa75 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:SATLEXMB04.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230022)(4636009)(396003)(136003)(346002)(39860400002)(376002)(451199015)(36840700001)(40470700004)(46966006)(36756003)(40480700001)(54906003)(186003)(316002)(40460700003)(6666004)(478600001)(36860700001)(5660300002)(7406005)(7416002)(2906002)(8676002)(70206006)(4326008)(8936002)(6916009)(41300700001)(70586007)(356005)(82740400003)(82310400005)(81166007)(336012)(2616005)(1076003)(26005)(16526019)(83380400001)(426003)(47076005)(36900700001);DIR:OUT;SFP:1101; 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The default is disabled for all existing designs. Signed-off-by: Brad Larson --- Changes since v6: - Previously patch 17/17 - Changed delay after reset_control_assert() from 9 to 3 usec - Renamed sdhci_mmc_hw_reset() to sdhci_cdns_mmc_hw_reset() --- drivers/mmc/host/sdhci-cadence.c | 31 +++++++++++++++++++++++++++++++ 1 file changed, 31 insertions(+) diff --git a/drivers/mmc/host/sdhci-cadence.c b/drivers/mmc/host/sdhci-cadence.c index e92aa79a8be2..62321cef41db 100644 --- a/drivers/mmc/host/sdhci-cadence.c +++ b/drivers/mmc/host/sdhci-cadence.c @@ -12,6 +12,7 @@ #include #include #include +#include #include "sdhci-pltfm.h" @@ -70,6 +71,7 @@ struct sdhci_cdns_priv { spinlock_t wrlock; /* write lock */ bool enhanced_strobe; void (*priv_writel)(struct sdhci_cdns_priv *priv, u32 val, void __iomem *reg); + struct reset_control *rst_hw; unsigned int nr_phy_params; struct sdhci_cdns_phy_param phy_params[]; }; @@ -458,6 +460,24 @@ static void sdhci_cdns_hs400_enhanced_strobe(struct mmc_host *mmc, SDHCI_CDNS_HRS06_MODE_MMC_HS400); } +extern unsigned int sdhci_timeout_val; + +static void sdhci_cdns_mmc_hw_reset(struct mmc_host *mmc) +{ + struct sdhci_host *host = mmc_priv(mmc); + struct sdhci_cdns_priv *priv = sdhci_cdns_priv(host); + + dev_dbg(mmc_dev(host->mmc), "emmc hardware reset\n"); + + reset_control_assert(priv->rst_hw); + /* For eMMC, minimum is 1us but give it 3us for good measure */ + udelay(3); + + reset_control_deassert(priv->rst_hw); + /* For eMMC, minimum is 200us but give it 300us for good measure */ + usleep_range(300, 1000); +} + static int sdhci_cdns_probe(struct platform_device *pdev) { struct sdhci_host *host; @@ -521,6 +541,17 @@ static int sdhci_cdns_probe(struct platform_device *pdev) if (ret) goto free; + if (host->mmc->caps & MMC_CAP_HW_RESET) { + priv->rst_hw = devm_reset_control_get_optional_exclusive(dev, "hw"); + if (IS_ERR(priv->rst_hw)) { + ret = PTR_ERR(priv->rst_hw); + if (ret == -ENOENT) + priv->rst_hw = NULL; + } else { + host->mmc_host_ops.card_hw_reset = sdhci_cdns_mmc_hw_reset; + } + } + ret = sdhci_add_host(host); if (ret) goto free;