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Thu, 08 Jan 2026 06:23:54 -0800 (PST) Message-ID: Subject: Re: [PATCH] arm64: dts: ti: k3-am62a7-sk: Disable mmc Schmitt Trigger From: Alexander Sverdlin To: Vitor Soares , "Markus Schneider-Pargmann (TI.com)" , Nishanth Menon , Vignesh Raghavendra Cc: Vishal Mahaveer , Kevin Hilman , Dhruva Gole , Sebin Francis , Kendall Willis , Akashdeep Kaur , linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Date: Thu, 08 Jan 2026 15:23:55 +0100 In-Reply-To: <49bfb30f71eae0844676e6b545d67739b6d79539.camel@gmail.com> References: <20260106-topic-am62a-mmc-pinctrl-v6-19-next-v1-1-1190ac29aadb@baylibre.com> <49bfb30f71eae0844676e6b545d67739b6d79539.camel@gmail.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.58.2 Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Hi Vitor, On Thu, 2026-01-08 at 14:07 +0000, Vitor Soares wrote: > On Tue, 2026-01-06 at 17:22 +0100, Markus Schneider-Pargmann (TI.com) wro= te: > > Remove Schmitt Trigger from mmc pins. With Schmitt Trigger enabled > > u-boot SPL is not able to read u-boot from mmc: > >=20 > > =C2=A0=C2=A0=C2=A0 Trying to boot from MMC2 > > =C2=A0=C2=A0=C2=A0 Error reading cluster > > =C2=A0=C2=A0=C2=A0 spl_load_image_fat: error reading image u-boot.img, = err - -22 > > =C2=A0=C2=A0=C2=A0 Error: -22 > > =C2=A0=C2=A0=C2=A0 SPL: Unsupported Boot Device! > > =C2=A0=C2=A0=C2=A0 SPL: failed to boot from all boot devices > > =C2=A0=C2=A0=C2=A0 ### ERROR ### Please RESET the board ### > >=20 > > I bisected this issue between u-boot v2025.10 and v2026.01 and found th= e > > 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 SP= L > > failure to read from mmc. > >=20 > > Fixes: 5b272127884b ("arm64: dts: ti: k3-pinctrl: Enable Schmitt Trigge= r by > > default") > > Signed-off-by: Markus Schneider-Pargmann (TI.com) > >=20 > Hi Markus, >=20 > We're seeing a similar issue on Verdin AM62 with U-Boot 2026.01. The > board has complete SPL boot failure with no output at all. >=20 > This occurs in the same version you bisected (v2026.01 failing). > Could the Schmitt Trigger changes also affect Verdin AM62? they do affect AM62, even though not not every HW, I have one HW variant working properly and one where I observe the problem. Maybe a revert of 5b272127884b for now would make more sense than just fixing AM62A7. I unfortunately do not have any reply on this from TI yet. --=20 Alexander Sverdlin.