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Message-ID: <20250417182652.3521104-1-jm@ti.com>
Date: Thu, 17 Apr 2025 13:26:50 -0500
From: Judith Mendez <jm@...com>
To: Ulf Hansson <ulf.hansson@...aro.org>,
        Adrian Hunter
	<adrian.hunter@...el.com>
CC: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>, <linux-mmc@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Josua Mayer
	<josua@...id-run.com>, Moteen Shah <m-shah@...com>,
        Francesco Dolcini
	<francesco@...cini.it>,
        Hiago De Franco <hiagofranco@...il.com>
Subject: [PATCH v2 0/2] Fix V1P8_SIGNAL_ENA

There are eMMC boot failures seen with V1P8_SIGNAL_ENA on Kingston
eMMC and variouse types of SD cards on Sitara K3 SoCs due to the
sequencing when enumerating to HS200 mode. Since V1P8_SIGNAL_ENA is
optional for eMMC, do not set V1P8_SIGNAL_ENA by default for eMMC.
For SD cards we shall parse DT for ti,suppress-v1p8-ena property
to determine whether to apply the 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 optional ti,suppress-v1p8-ena DT property
to apply the quirk for SD.

Changes since v1:
- Drop patch for High_Speed_ENA
- Add ti,suppress-v1p8-ena for SD cards
- Add binding patch for ti,suppress-v1p8-ena
- Update cover-letter/patch descriptions according to new changes

[0] https://lore.kernel.org/linux-mmc/20250127-am654-mmc-regression-v2-1-9bb39fb12810@solid-run.com/

Judith Mendez (2):
  mmc: sdhci_am654: Add sdhci_am654_start_signal_voltage_switch
  dt-bindings: mmc: sdhci-am654: Add ti,suppress-v1p8-ena

 .../devicetree/bindings/mmc/sdhci-am654.yaml  |  5 +++
 drivers/mmc/host/sdhci_am654.c                | 32 +++++++++++++++++++
 2 files changed, 37 insertions(+)

-- 
2.49.0


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