linux-kernel - Re: [PATCH] arm64: dts: ti: k3-am62a7-sk: Disable mmc Schmitt Trigger

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Message-ID: <6c90102537c3e3f1712538ca0b165cd54d71d8c2.camel@gmail.com>
Date: Wed, 07 Jan 2026 23:57:53 +0100
From: Alexander Sverdlin <alexander.sverdlin@...il.com>
To: Markus Schneider-Pargmann <msp@...libre.com>, Nishanth Menon
 <nm@...com>,  Vignesh Raghavendra	 <vigneshr@...com>, Tero Kristo
 <kristo@...nel.org>, Rob Herring <robh@...nel.org>,  Krzysztof Kozlowski	
 <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>
Cc: Vishal Mahaveer <vishalm@...com>, Kevin Hilman <khilman@...libre.com>, 
 Dhruva Gole <d-gole@...com>, Sebin Francis <sebin.francis@...com>, Kendall
 Willis <k-willis@...com>,  Akashdeep Kaur	 <a-kaur@...com>,
 linux-arm-kernel@...ts.infradead.org, 	devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64: dts: ti: k3-am62a7-sk: Disable mmc Schmitt
 Trigger

Hi Markus,

On Tue, 2026-01-06 at 21:25 +0100, Markus Schneider-Pargmann wrote:
> > I think we would need to discuss this with TI via our FAE, because the change
> > in question has both been discussed with former FAE and the technical team
> > behind, and adopted in TI SDK.
> > 
> > Or have you already discused this with corresponding TI HW team?
> > 
> > Which hardware is affected, is it the official SK-AM62A-LP?
> > Is MMC2 the SD-card?
> 
> I only tested my am62a board on u-boot v2026.01. It is a SK-AM62A-LP.
> MMC2 is the SD-card and mmc1 in the devicetree.

just wanted to let you know, I was able to reproduce the problems with SD
card access via MMC2 under Linux on AM623 with ST enabled.

We will seek clarification from TI on why this happens, which peripherals
are affected and what should be the course of actions.

-- 
Alexander Sverdlin.