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Thu, 5 Nov 2026 09:17:10 +0100 Message-ID: <4f90060d-6eae-4cf9-9533-6adc51f52423@foss.st.com> Date: Thu, 5 Nov 2026 09:17:08 +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 3/5] mmc: mmci: stm32: use the delay block above 100 MHz on stm32mp25 SoC 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> <20261104152657.14909-4-mateusz.nowicki@posteo.net> Content-Language: en-US From: Christophe KERELLO In-Reply-To: <20261104152657.14909-4-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: MI3PEPF0000849B:EE_|AS8PR10MB7825:EE_ X-MS-Office365-Filtering-Correlation-Id: 35857e6d-0ee6-4092-4f63-08df3b15313a X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|36860700016|376014|82310400026|7416014|23010399003|1800799024|10067099003|18002099003|22082099003|56012099006|11063799006|261022105027099003|4143699003|261021123027099003|261009223027099003|261021121427099003|261028144727099003|261026140227099003|261102123227099003; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: SfdYbs5KOZzQdc8s+6JOrFTWL3mxHryPExyMvvLaqguN6ogQJu9fsOYDCXxvCyDAvm+6EvxTgXH1+9ORAkdRwfoXIwIDYhbtSg0Fu7phZ4OthzkK+ulbCTzpvv9LJh+tGaAmfcokO0f7gCAcy7n2OiCuWcBxH11tJm3Ozv3PlisVysyWSGvQ5JaFIY29ooFlMej/t3hX4ONkQTAT1/wLkVO/47zZh/cLUBv7SB9zs1/R2Ck0oeMQwWR4Z12cfpQYw5lhloEH+Y2Pm+JN3q0SoKWM+vBr0W9jJQmEY552ScylDFT9xWzCZuPuwqY5UOv7kE+TpFk91nh6zHOWrqAER9cO5p446QbS7z5a0qs+ckqdSzepqmLl2rkxVQ9ZxEVNRQpwQuPcSWBOIbyv9EU7n9+OKa5gsOYMYqJNnyRE5FzmsaCmrI2KZzwLYtLptRoO X-OriginatorOrg: foss.st.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 05 Nov 2026 08:17:11.5710 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 35857e6d-0ee6-4092-4f63-08df3b15313a X-MS-Exchange-CrossTenant-Id: 75e027c9-20d5-47d5-b82f-77d7cd041e8f X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=75e027c9-20d5-47d5-b82f-77d7cd041e8f;Ip=[164.130.1.59];Helo=[smtpO365.st.com] X-MS-Exchange-CrossTenant-AuthSource: MI3PEPF0000849B.eurprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: AS8PR10MB7825 Hello Mateusz, On 11/4/26 16:27, Mateusz Nowicki wrote: > From: Christophe Kerello > > On stm32mp25 SoC, the delay block has to be used only for an external > data frequency above 100 MHz. Skip the tuning up to that frequency, keep > 50 MHz for stm32mp15 as before. > > Fixes: b5c3eb385797 ("mmc: mmci: stm32: add delay block support for STM32MP25") > Cc:stable@vger.kernel.org > Signed-off-by: Christophe Kerello > [Mateusz: reworded the commit message, check dlyb before reading > min_freq, added Fixes and Cc stable] Thanks for the fix. > Signed-off-by: Mateusz Nowicki > --- > > Notes: > On the STM32MP257F-DK (SDMMC2 kernel clock 200 MHz, eMMC in HS200 at > 100 MHz) the writes failed with I/O errors in all 9 test runs without > this change, with sdmmc2 pins_a or pins_b and with or without NEGEDGE. > With it all 6 runs were correct, on both pin groups. > > drivers/mmc/host/mmci_stm32_sdmmc.c | 16 +++++++++++----- > 1 file changed, 11 insertions(+), 5 deletions(-) Reviewed-by: Christophe Kerello Regards, Christophe Kerello.