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Wed, 14 Jan 2026 16:04:29 -0600 Received: from [128.247.81.105] (judy-hp.dhcp.ti.com [128.247.81.105]) by lelvem-mr05.itg.ti.com (8.18.1/8.18.1) with ESMTP id 60EM4TYL480239; Wed, 14 Jan 2026 16:04:29 -0600 Message-ID: <1a91fd40-e814-4b4c-8914-d8f0c4768e07@ti.com> Date: Wed, 14 Jan 2026 16:04:29 -0600 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] arm64: dts: ti: k3-am62a7-sk: Disable mmc Schmitt Trigger To: Markus Schneider-Pargmann , Alexander Sverdlin CC: Vishal Mahaveer , Kevin Hilman , Dhruva Gole , Sebin Francis , "Kendall Willis" , Akashdeep Kaur , , , "Conor Dooley" , Krzysztof Kozlowski , "Rob Herring" , , Nishanth Menon , Vignesh Raghavendra , Tero Kristo References: <20260106-topic-am62a-mmc-pinctrl-v6-19-next-v1-1-1190ac29aadb@baylibre.com> Content-Language: en-US From: Judith Mendez In-Reply-To: Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 7bit X-C2ProcessedOrg: 333ef613-75bf-4e12-a4b1-8e3623f5dcea X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SA2PEPF00003AE7:EE_|SJ0PR10MB5835:EE_ X-MS-Office365-Filtering-Correlation-Id: f25fbb9e-4b46-419b-9377-08de53b8e5a1 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|82310400026|1800799024|36860700013|34020700016|7416014|376014|12100799066; 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X-OriginatorOrg: ti.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 14 Jan 2026 22:04:32.4100 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: f25fbb9e-4b46-419b-9377-08de53b8e5a1 X-MS-Exchange-CrossTenant-Id: e5b49634-450b-4709-8abb-1e2b19b982b7 X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=e5b49634-450b-4709-8abb-1e2b19b982b7;Ip=[198.47.23.195];Helo=[lewvzet201.ext.ti.com] X-MS-Exchange-CrossTenant-AuthSource: SA2PEPF00003AE7.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ0PR10MB5835 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260114_140437_370820_7B91D000 X-CRM114-Status: GOOD ( 19.52 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi Markus, On 1/14/26 3:16 AM, Markus Schneider-Pargmann wrote: > Hi Judith, > > On Tue Jan 13, 2026 at 1:29 AM CET, Judith Mendez wrote: >> On 1/6/26 10:22 AM, Markus Schneider-Pargmann (TI.com) wrote: >>> Remove Schmitt Trigger from mmc pins. With Schmitt Trigger enabled >>> u-boot SPL is not able to read u-boot from mmc: >>> >>> Trying to boot from MMC2 >>> Error reading cluster >>> spl_load_image_fat: error reading image u-boot.img, err - -22 >>> Error: -22 >>> SPL: Unsupported Boot Device! >>> SPL: failed to boot from all boot devices >>> ### ERROR ### Please RESET the board ### >>> >>> I bisected this issue between u-boot v2025.10 and v2026.01 and found the >>> devicetree merge to be the problem. At a closer look I found the >>> k3-pinctrl.h changes. Disabling the Schmitt Trigger fixes the u-boot SPL >>> failure to read from mmc. >> >> I have tested 4 AM62A SK boards and I cannot replicate the issue >> you are seeing. I do not see an issue with Schmitt Trigger in U-boot >> nor Linux /: > > Thanks for testing. > >> Can you please run a quick tap sweep on MMC1 and MMC0 interfaces like >> so? https://gist.github.com/jmenti/f4a73a8323e44bf717c6d2c528c499ca >> >> This will give me an idea if whether we should be talking about >> revisiting characterization with ST_ENA=1. > > The patch was a bit broken, but I think I managed to apply it to > v2026.01 as it was supposed to be. (master currently doesn't boot even > SPL, I don't have time right now to debug that). as Nishanth, mentioned, master is missing two patches [0][1] > > I attached the boot log. It does boot with your patch. Also can this be > an issue with different SD cards? Something does not quite add up, Can you try the following 2 commands? # mmc dev 1 # md.w 0xfa0810c [0] https://gist.github.com/jmenti/92da6526e366e3f5cf41911724886471 [1] https://gist.github.com/jmenti/8cf589d0302248ad26da37128f622e98 ~ Judith