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Sat, 11 Mar 2023 18:47:12 -0600 From: Brad Larson To: CC: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , Subject: [PATCH v11 14/15] mmc: sdhci-cadence: Support mmc hardware reset Date: Sat, 11 Mar 2023 16:44:44 -0800 Message-ID: <20230312004445.15913-15-blarson@amd.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20230312004445.15913-1-blarson@amd.com> References: <20230312004445.15913-1-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: DM6NAM11FT060:EE_|DM6PR12MB4332:EE_ X-MS-Office365-Filtering-Correlation-Id: e984df04-d42f-4443-bc58-08db229353d1 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:(13230025)(4636009)(136003)(39860400002)(346002)(396003)(376002)(451199018)(46966006)(36840700001)(40470700004)(186003)(356005)(2906002)(16526019)(82740400003)(26005)(1076003)(2616005)(81166007)(8936002)(5660300002)(36860700001)(7406005)(6666004)(7416002)(6916009)(336012)(426003)(47076005)(40460700003)(41300700001)(4326008)(8676002)(82310400005)(40480700001)(70586007)(70206006)(36756003)(478600001)(316002)(83380400001)(54906003)(36900700001);DIR:OUT;SFP:1101; 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The default is disabled for all existing designs. Signed-off-by: Brad Larson Acked-by: Adrian Hunter --- v9 changes: - 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 | 27 +++++++++++++++++++++++++++ 1 file changed, 27 insertions(+) diff --git a/drivers/mmc/host/sdhci-cadence.c b/drivers/mmc/host/sdhci-cadence.c index c0024d1e69a8..0d8db1a54729 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[]; }; @@ -455,6 +457,22 @@ static void sdhci_cdns_hs400_enhanced_strobe(struct mmc_host *mmc, SDHCI_CDNS_HRS06_MODE_MMC_HS400); } +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; @@ -518,6 +536,15 @@ 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, NULL); + if (IS_ERR(priv->rst_hw)) + return dev_err_probe(mmc_dev(host->mmc), PTR_ERR(priv->rst_hw), + "reset controller error\n"); + if (priv->rst_hw) + host->mmc_host_ops.card_hw_reset = sdhci_cdns_mmc_hw_reset; + } + ret = sdhci_add_host(host); if (ret) goto free;