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client-ip=165.204.84.17; helo=SATLEXMB03.amd.com; pr=C Received: from SATLEXMB03.amd.com (165.204.84.17) by SJ5PEPF000001F7.mail.protection.outlook.com (10.167.242.75) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.8964.20 via Frontend Transport; Mon, 21 Jul 2025 09:54:27 +0000 Received: from SATLEXMB06.amd.com (10.181.40.147) by SATLEXMB03.amd.com (10.181.40.144) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.39; Mon, 21 Jul 2025 04:54:26 -0500 Received: from SATLEXMB04.amd.com (10.181.40.145) by SATLEXMB06.amd.com (10.181.40.147) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.39; Mon, 21 Jul 2025 04:54:25 -0500 Received: from xhdlakshmis40.xilinx.com (10.180.168.240) by SATLEXMB04.amd.com (10.181.40.145) with Microsoft SMTP Server id 15.1.2507.39 via Frontend Transport; Mon, 21 Jul 2025 04:54:23 -0500 From: Sai Krishna Potthuri To: Adrian Hunter , Michal Simek , Ulf Hansson CC: , , , , , Sai Krishna Potthuri Subject: [PATCH] mmc: sdhci-of-arasan: Ensure CD logic stabilization before power-up Date: Mon, 21 Jul 2025 15:23:57 +0530 Message-ID: <20250721095357.3783222-1-sai.krishna.potthuri@amd.com> X-Mailer: git-send-email 2.25.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ5PEPF000001F7:EE_|MN2PR12MB4158:EE_ X-MS-Office365-Filtering-Correlation-Id: 0cab4684-c9a4-4260-e350-08ddc83c94e5 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|82310400026|36860700013|376014; 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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 21 Jul 2025 09:54:27.6819 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 0cab4684-c9a4-4260-e350-08ddc83c94e5 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB03.amd.com] X-MS-Exchange-CrossTenant-AuthSource: SJ5PEPF000001F7.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN2PR12MB4158 Content-Type: text/plain; charset="utf-8" During SD suspend/resume without a full card rescan (when using non-removable SD cards for rootfs), the SD card initialization may fail after resume. This occurs because, after a host controller reset, the card detect logic may take time to stabilize due to debounce logic. Without waiting for stabilization, the host may attempt powering up the card prematurely, leading to command timeouts during resume flow. Add sdhci_arasan_set_power_and_bus_voltage() to wait for the card detect stable bit before power up the card. Since the stabilization time is not fixed, a maximum timeout of one second is used to ensure sufficient wait time for the card detect signal to stabilize. Signed-off-by: Sai Krishna Potthuri --- drivers/mmc/host/sdhci-of-arasan.c | 24 ++++++++++++++++++++++-- 1 file changed, 22 insertions(+), 2 deletions(-) diff --git a/drivers/mmc/host/sdhci-of-arasan.c b/drivers/mmc/host/sdhci-of= -arasan.c index 42878474e56e..3ce55009ba4a 100644 --- a/drivers/mmc/host/sdhci-of-arasan.c +++ b/drivers/mmc/host/sdhci-of-arasan.c @@ -99,6 +99,9 @@ #define HIWORD_UPDATE(val, mask, shift) \ ((val) << (shift) | (mask) << ((shift) + 16)) =20 +#define CD_STABLE_TIMEOUT_US 1000000 +#define CD_STABLE_MAX_SLEEP_US 10 + /** * struct sdhci_arasan_soc_ctl_field - Field used in sdhci_arasan_soc_ctl_= map * @@ -514,6 +517,23 @@ static int sdhci_arasan_voltage_switch(struct mmc_host= *mmc, return -EINVAL; } =20 +static void sdhci_arasan_set_power_and_bus_voltage(struct sdhci_host *host= , unsigned char mode, + unsigned short vdd) +{ + u32 reg; + + /* + * Ensure that the card detect logic has stabilized before powering up, t= his is + * necessary after a host controller reset. + */ + if (mode =3D=3D MMC_POWER_UP) { + readl_poll_timeout(host->ioaddr + SDHCI_PRESENT_STATE, reg, reg & SDHCI_= CD_STABLE, + CD_STABLE_MAX_SLEEP_US, CD_STABLE_TIMEOUT_US); + } + + sdhci_set_power_and_bus_voltage(host, mode, vdd); +} + static const struct sdhci_ops sdhci_arasan_ops =3D { .set_clock =3D sdhci_arasan_set_clock, .get_max_clock =3D sdhci_pltfm_clk_get_max_clock, @@ -521,7 +541,7 @@ static const struct sdhci_ops sdhci_arasan_ops =3D { .set_bus_width =3D sdhci_set_bus_width, .reset =3D sdhci_arasan_reset, .set_uhs_signaling =3D sdhci_set_uhs_signaling, - .set_power =3D sdhci_set_power_and_bus_voltage, + .set_power =3D sdhci_arasan_set_power_and_bus_voltage, .hw_reset =3D sdhci_arasan_hw_reset, }; =20 @@ -570,7 +590,7 @@ static const struct sdhci_ops sdhci_arasan_cqe_ops =3D { .set_bus_width =3D sdhci_set_bus_width, .reset =3D sdhci_arasan_reset, .set_uhs_signaling =3D sdhci_set_uhs_signaling, - .set_power =3D sdhci_set_power_and_bus_voltage, + .set_power =3D sdhci_arasan_set_power_and_bus_voltage, .irq =3D sdhci_arasan_cqhci_irq, }; =20 --=20 2.25.1