linux-kernel - Re: [PATCH v4 0/2] Add SDHCI_QUIRK2_SUPPRESS_V1P8

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Message-ID: <849a5e47-5b37-40e4-8b76-a58adb7e9b90@ti.com>
Date: Mon, 5 May 2025 16:24:21 -0500
From: "Mendez, Judith" <jm@...com>
To: Adrian Hunter <adrian.hunter@...el.com>,
        Ulf Hansson
	<ulf.hansson@...aro.org>
CC: Josua Mayer <josua@...id-run.com>, <linux-mmc@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, Nishanth Menon <nm@...com>,
        Francesco Dolcini
	<francesco@...cini.it>,
        Hiago De Franco <hiagofranco@...il.com>, Moteen Shah
	<m-shah@...com>
Subject: Re: [PATCH v4 0/2] Add SDHCI_QUIRK2_SUPPRESS_V1P8_ENA

Hi all,

On 4/24/2025 1:00 PM, Judith Mendez wrote:
> There are MMC boot failures seen with V1P8_SIGNAL_ENA on Kingston eMMC and
> Microcenter/Patriot SD cards on am62* Sitara K3 boards due to the HS200
> initialization sequence involving V1P8_SIGNAL_ENA. Since V1P8_SIGNAL_ENA
> is optional for eMMC and only affects timing for host controllers using
> ti,am62-sdhci compatible so far, add a new platform data structure for am62
> compatible and append the new SDHCI_QUIRK2_SUPPRESS_V1P8_ENA quirk.
> 
> This fix was previously merged in the kernel, but was reverted due
> to the "heuristics for enabling the quirk"[0]. This issue is adressed
> in this patch series by adding the quirk based on compatible string,
> ensuring the quirk is never applied to devices with internal LDOs, then
> V1P8_SIGNAL_ENA also has a voltage component tied to it.

Gentle ping on this, are there any comments or any issues with this
type of implementation?

Thanks,

~ Judith