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Wed, 9 Sep 2026 10:36:09 -0500 Message-ID: <3079f9bc-5a15-40bc-bf8d-1b53c32ffccb@ti.com> Date: Wed, 9 Sep 2026 10:36:09 -0500 Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] mmc: dts: am654: Add 650ms power off delay for proper MMC power cycle To: Nishanth Menon CC: Vignesh Raghavendra , Tero Kristo , Rob Herring , Krzysztof Kozlowski , Conor Dooley , , , References: <20260908170635.238775-1-jm@ti.com> <20260908171613.bpd6eo53cjtlrztr@macaw> <20260908174934.pbbvtrfhlnjinipu@constable> <20260909103646.7jk5vwvyc7tku5yv@kennel> Content-Language: en-US From: Judith Mendez In-Reply-To: <20260909103646.7jk5vwvyc7tku5yv@kennel> Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 7bit X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BN7PEPF000000A4:EE_|CH4PR10MB8194:EE_ X-MS-Office365-Filtering-Correlation-Id: 8f2c3578-1aa6-4792-12a5-08df0e882c57 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|36860700016|23010399003|376014|82310400026|1800799024|4143699003|10067099003|56012099006|22082099003|18002099003|6133799003; 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Measured discharge time on this board is ~632.97ms to >>>>>> reach < 0.5V threshold. >>>>>> >>>>>> During boot, MMC power cycles between boot stages. Without power off >>>>>> delay, VDD doesn't fully discharge. Card retains 1.8V signaling state >>>>>> from previous stages. When U-Boot initializes, card no longer asserts >>>>>> S18A in ACMD41 response (already switched to 1.8V). Host misinterprets >>>>>> card state and forces 1.8V anyway, falling into a bad state and causing >>>>>> a boot failure. >>>>>> >>>>>> Add power-off-delay-us = 650000 (650ms) to ensure proper VDD discharge >>>>>> during power cycles, allowing card to fully reset state between boot >>>>>> stages. >>>>>> >>>>>> Signed-off-by: Judith Mendez >>>>> >>>>> Fixes ? >>>> >>>> Fix is really for u-boot, don't think I can point to a u-boot >>>> commit here can I? >>> >>> You'd face the same problem if you are starting from a different boot >>> media and then enable MMC in linux kernel, right? what was described in >>> the patch sounds like a discharge latency of the evm. This was missed in >>> the original commit? >>> >> >> Not exactly. The failure is only seen at u-boot specifically with >> SD card boot. Very specifically due to the MMC driver in u-boot and >> commit [0] which is not reverted since it is technically correct. >> The commit just happened to expose our EVM's issue first. According to >> the discussion, mirror Linux patch may be coming soon, which we are >> now prepared for with this patch and [1]. >> >> [0] >> https://lore.kernel.org/u-boot/d17a810c-e2db-4a24-a37d-2d7e02466ce9@ti.com/ >> [1] https://lore.kernel.org/linux-mmc/20260806162202.657512-1-jm@ti.com/ > > This context is useful in diffstat. I see the driver fix in kernel which > can use this property not present in previous kernels, hence no fixes. > > That said, please fix $subject for v2 and repost. I suggest: > arm64: dts: ti: k3-am654-base-board: Add power off delay for proper MMC power cycle > Ok, will fixup coverletter and subject for v2. Thanks. ~ Judith