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Thu, 5 Nov 2026 09:18:40 +0100 Message-ID: <52ac2ac0-c990-4f78-a1a2-a5f5ecfa3948@foss.st.com> Date: Thu, 5 Nov 2026 09:18:38 +0100 X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 4/5] arm64: dts: st: use sdmmc2 pins_a on stm32mp257f-dk To: Mateusz Nowicki , Ulf Hansson , CC: Russell King , Linus Walleij , Yann Gautier , Maxime Coquelin , Alexandre Torgue , Rob Herring , Krzysztof Kozlowski , Conor Dooley , , , , References: <20261104152657.14909-1-mateusz.nowicki@posteo.net> <20261104152657.14909-5-mateusz.nowicki@posteo.net> Content-Language: en-US From: Christophe KERELLO In-Reply-To: <20261104152657.14909-5-mateusz.nowicki@posteo.net> Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 7bit X-ClientProxiedBy: STKCAS1NODE1.st.com (10.75.128.134) To STKDAG1NODE2.st.com (10.75.128.133) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DB1PEPF000509F0:EE_|PA4PR10MB5730:EE_ X-MS-Office365-Filtering-Correlation-Id: 9bfed186-a32f-4b4d-fa29-08df3b15671c X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|36860700016|82310400026|23010399003|376014|7416014|1800799024|3023799007|10067099003|22082099003|18002099003|261022105027099003|4143699003|11063799006|5023799004|261026140227099003|261021121427099003|261021123027099003|56012099006|261009223027099003|261102123227099003|261028144727099003; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: jmt4WYB9fg90/aUC3w1IzbtfGcJ9LO7CxZVMV4y6oCzQaUR9DH1piPgoT1ED2ogr86pcidvn4edc/Vm4BcdQ+nSb2bDYaFn+rJ/QhVOWhEQuv4ptGTkMnFpQW5p5njdS2v5qzl1c1ILYeH0E509m6Yup/U3CzEyNcHtK/JJUzQoMKdY0vwrgI9h2/J9aOql7ILKmxPmaDZ0rrF8kq8R5FwfQLq/O+v1Q1IIqJbRGiS8LLy+U7ZMhgQlMWo6qJYJo7264yFnXjCmdyqU8WDVazAoVJopFhFeqeyUlKkctNxbhaMXGO5FHxJ4pGEVuL6DouA0+fpJIvoMl4fHh6jEddyeOdbu22NwQhhrpzI+klEqX/89GW33UH2O6AL9EElY9UTntnxua5jyMZvhwYSm8/1B8Q74yphiyEMCgYcOxkaTpUPqpwOd/zcrC8TXEGks9 X-OriginatorOrg: foss.st.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 05 Nov 2026 08:18:41.8996 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 9bfed186-a32f-4b4d-fa29-08df3b15671c X-MS-Exchange-CrossTenant-Id: 75e027c9-20d5-47d5-b82f-77d7cd041e8f X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=75e027c9-20d5-47d5-b82f-77d7cd041e8f;Ip=[164.130.1.60];Helo=[smtpO365.st.com] X-MS-Exchange-CrossTenant-AuthSource: DB1PEPF000509F0.eurprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PA4PR10MB5730 Hello Mateusz, On 11/4/26 16:27, Mateusz Nowicki wrote: > The eMMC of the STM32MP257F-DK was moved to the faster sdmmc2 pins_b > groups because HS200 at 100 MHz returned corrupted data with pins_a. The > cause was the delay block, which was used at 100 MHz, not the slew rate > of the pins. With "mmc: mmci: stm32: use the delay block above 100 MHz > on stm32mp25 SoC" HS200 works with pins_a at 100 MHz, and at 150 MHz > with the delay block. > > Use pins_a again. Their slower outputs avoid overshoots on the SDMMC2 > clock, which can disturb other blocks such as USB. > > Fixes: 94911ce62b45 ("arm64: dts: st: enable eMMC on stm32mp257f-dk") > Suggested-by: Christophe Kerello > Signed-off-by: Mateusz Nowicki > --- > > Notes: > This needs patch 3 of the series: without it HS200 at 100 MHz loses writes > with pins_a. With it, the eMMC of the DK passed every 832 MiB write and > read-back run on pins_a at 100 MHz and at 150 MHz (see the cover letter). > > arch/arm64/boot/dts/st/stm32mp257f-dk.dts | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) Reviewed-by: Christophe Kerello Regards, Christophe Kerello.