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Thu, 24 Sep 2026 06:41:14 +0000 Message-ID: Date: Thu, 24 Sep 2026 09:41:10 +0300 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 1/4] mmc: sdhci-cadence6: add PHY settle delay after tuning DLL re-lock To: , Ulf Hansson , Tanmay Kathpalia , , , Rob Herring , "Krzysztof Kozlowski" , Conor Dooley , References: Content-Language: en-US From: Adrian Hunter Organization: Intel Finland Oy, Registered Address: c/o Alberga Business Park, 6 krs, Bertel Jungin Aukio 5, 02600 Espoo, Business Identity Code: 0357606 - 4, Domiciled in Helsinki In-Reply-To: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-ClientProxiedBy: DUZPR01CA0016.eurprd01.prod.exchangelabs.com (2603:10a6:10:46b::9) To IA1PR11MB7198.namprd11.prod.outlook.com (2603:10b6:208:419::15) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: IA1PR11MB7198:EE_|PH7PR11MB6356:EE_ X-MS-Office365-Filtering-Correlation-Id: 9e637b6a-8992-4986-6c7b-08df1a06d419 X-LD-Processed: 46c98d88-e344-4ed4-8496-4ed7712e255d,ExtAddr X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|1800799024|23010399003|366016|6133799003|18002099003|22082099003|11063799006|10067099003|56012099006|4143699003; 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Without this > settle time the command issued immediately after tuning (e.g. the R1b > CMD6 that switches eMMC from HS200 down to HS during HS400 selection) > can time out. > > Signed-off-by: Tze Yee Ng Presume you realize the delay is inside the tuning loop, so 40x 5ms is 200ms total. Nevertheless: Acked-by: Adrian Hunter > --- > drivers/mmc/host/sdhci-cadence-phy-v6.c | 3 +++ > 1 file changed, 3 insertions(+) > > diff --git a/drivers/mmc/host/sdhci-cadence-phy-v6.c b/drivers/mmc/host/sdhci-cadence-phy-v6.c > index 22d56bb46d75..35f35ef9c710 100644 > --- a/drivers/mmc/host/sdhci-cadence-phy-v6.c > +++ b/drivers/mmc/host/sdhci-cadence-phy-v6.c > @@ -811,6 +811,9 @@ int sdhci_cdns6_set_tune_val(struct sdhci_host *host, unsigned int val) > if (ret) > dev_warn(mmc_dev(host->mmc), "%s: DLL reset release failed: %d\n", __func__, ret); > > + /* Allow 5 to 5.5 ms for clock and PHY signals to stabilize after configuration */ > + usleep_range(5000, 5500); > + > return ret; > } >