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Mon, 13 Jul 2026 20:37:23 -0500 Received: from lelvem-mr06.itg.ti.com (10.180.75.8) by DFLE215.ent.ti.com (10.64.6.73) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.37 via Frontend Transport; Mon, 13 Jul 2026 20:37:23 -0500 Received: from [10.249.33.93] ([10.249.33.93]) by lelvem-mr06.itg.ti.com (8.18.1/8.18.1) with ESMTP id 66E1bN9j2962501; Mon, 13 Jul 2026 20:37:23 -0500 Message-ID: Date: Mon, 13 Jul 2026 20:37:22 -0500 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] mmc: sd: Handle UHS-I voltage signaling without power cycle To: Peng Fan , "Kathpalia, Tanmay" , "Peng Fan (OSS)" CC: "u-boot@lists.denx.de" , "trini@konsulko.com" , "jh80.chung@samsung.com" , "marex@denx.de" , "tien.fong.chee@altera.com" References: <20251021204526.22701-1-tanmay.kathpalia@altera.com> <96aa516d-9039-4b64-a779-3f16a9b9b816@ti.com> <2e75ec28-a3b0-4890-8e10-ea0459d6ff7d@altera.com> <2571b1a0-9395-40e7-a85e-4204c7543d39@ti.com> Content-Language: en-US From: "Mendez, Judith" In-Reply-To: Content-Type: text/plain; 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Ip=[198.47.21.195]; Helo=[flwvzet201.ext.ti.com] X-MS-Exchange-CrossTenant-AuthSource: BN2PEPF000044A3.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA1PR10MB7113 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNzE0MDAxMyBTYWx0ZWRfXze60vgsYWack l8TGk1dXKxdlguZwtMtj4a0pReP4TtA/QbAsZn8HOcNMj06KSQELM9wVW5iAjtv+XwdwHB1GXw3 KsrJAg5JpaX/h+VWqsPsc5UkLjEh/HKVlWQdThUvvGGtkG9fuN8wbEsIP9rhz8wrikmYWQdzT4w Yl0OjgnHuA7QuV0XNDMAwPicf4Wdegq0RnM/05/EG3PVGvGkkG0qKILs5rNElTcMmA+1GGNg12+ CYpa39FDfKi9FQehVsb6ObVOaQB7kgj8Zkg7EZnmmUq+PvUcVEzEzqZOi7xu2fJkuKP1VKo/7AV YJo4C4dnh0Tt5F40BgHaUVbFmWjS4hZ+UZGJfrLjco9zBhjqLOyUvTKi1XhOzlDRyB+cgEuBGdm /iIriXRqAHnTZW6bltfFVattGE+Po2ZCTnBnsYYi0JfJyOoNm384L4ROqblKRCrwHnjagIfTVJQ 1O+YgYWhMvqDginFfbQ== X-Proofpoint-GUID: aENFNkHAe2GaPxy7AEASjFj9rHg4GgOb X-Proofpoint-Spam-Info: AW1haW4tMjYwNzE0MDAxMyBTYWx0ZWRfXysNrE99EPqlV sYB3ZP22HvxlTg7vqTJjkyoW7QbYqYiKw0AsdQPhE0KDAeuJp253skbrxRgP7SGa+z6bMAESiqc plrs+S2smjsaO9hgqcaviR4uMilV+lw= X-Proofpoint-ORIG-GUID: aENFNkHAe2GaPxy7AEASjFj9rHg4GgOb X-Authority-Analysis: v=2.4 cv=Frk1OWrq c=1 sm=1 tr=0 ts=6a5592d8 cx=c_pps a=IhFJ2QRitvxj7yHj5jvJkw==:117 a=tJyPKKxUohctrY4NYmUjkA==:17 a=6eWqkTHjU83fiwn7nKZWdM+Sl24=:19 a=IkcTkHD0fZMA:10 a=RAioF0-LDSMA:10 a=V5UXEbMT0ywA:10 a=VkNPw1HP01LnGYTKEx00:22 a=Z8NIEmU8O1QQgoT56wFK:22 a=gO1vWkAQAl3rybz1DQOp:22 a=VzwNk457a8kPGWc87pwA:9 a=QEXdDO2ut3YA:10 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-07-13_06,2026-07-10_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 phishscore=0 lowpriorityscore=0 priorityscore=1501 clxscore=1011 suspectscore=0 adultscore=0 malwarescore=0 bulkscore=0 spamscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2607140013 X-BeenThere: u-boot@lists.denx.de X-Mailman-Version: 2.1.39 Precedence: list List-Id: U-Boot discussion List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: u-boot-bounces@lists.denx.de Sender: "U-Boot" X-Virus-Scanned: clamav-milter 0.103.8 at phobos.denx.de X-Virus-Status: Clean Hi Peng, Tanmay, On 7/13/2026 5:21 AM, Peng Fan wrote: > Hi Tanmay, > >> Subject: Re: [PATCH] mmc: sd: Handle UHS-I voltage signaling without >> power cycle >> > .... >> >> I worked with Judith Mendez to get to the bottom of this - she shared >> logs from the AM65 IDK board and we went back and forth analyzing >> them, which pointed to a board-level power sequencing problem on >> AM65x rather than an issue with this patch. In her words: >> "So it is truly a power issue, I have a patch to fix the issue on am65x. >> There is nothing wrong with your patch, coincidentally my power issue >> caused am65x to fall into a weird state and your commit caught that. >> So actually, thanks. I can now send my proper fix to the u-boot mailing >> list." >> >> So this patch did not introduce a regression - it actually helped uncover >> a latent power-sequencing issue on the AM65x board that was >> independent of this change. Judith will be sending a separate fix for the >> AM65x board issue. > > Thanks for the updating. > > Thanks, > Peng > >> >> I'd consider this matter closed with respect to this patch. Thanks Judith >> for digging into this and confirming the root cause. >> Confirm on the above. No problem, thanks to you for the collab (: ~ Judith