[PATCH RESEND v3 0/3] Add ti,suppress-v1p8-ena

Judith Mendez
2025-04-22T22:05:33Z

Resend patch series to fix cc list

There are MMC boot failures seen with V1P8_SIGNAL_ENA on Kingston eMMC
and Microcenter/Patriot SD cards on Sitara K3 boards due to the HS200
initialization sequence involving V1P8_SIGNAL_ENA. 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 suppress V1P8_SIGNAL_ENA. Add new ti,suppress-v1p8-ena
to am62x, am62ax, and am62px SoC dtsi files since there is no internal LDO
tied to sdhci1 interface so V1P8_SIGNAL_ENA only affects timing.

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
which determines whether to apply the quirk for SD.

Changes since v2:
- Include patch 3/3
- Reword cover letter
- Reword binding patch description
- Add fixes/cc tags to driver patch
- Reorder patches according to binding patch first
- Resend to fix cc list in original v3 series

Link to v2:
https://lore.kernel.org/linux-mmc/20250417182652.3521104-1-jm@ti.com/
Link to v1:
https://lore.kernel.org/linux-mmc/20250407222702.2199047-1-jm@ti.com/

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

Judith Mendez (3):
dt-bindings: mmc: sdhci-am654: Add ti,suppress-v1p8-ena
mmc: sdhci_am654: Add sdhci_am654_start_signal_voltage_switch
arm64: dts: ti: k3-am62*: add ti,suppress-v1p8-ena

.../devicetree/bindings/mmc/sdhci-am654.yaml | 5 +++
arch/arm64/boot/dts/ti/k3-am62-main.dtsi | 1 +
arch/arm64/boot/dts/ti/k3-am62a-main.dtsi | 1 +
.../dts/ti/k3-am62p-j722s-common-main.dtsi | 1 +
drivers/mmc/host/sdhci_am654.c | 32 +++++++++++++++++++
5 files changed, 40 insertions(+)

base-commit: 1be38f81251f6d276713c259ecf4414f82f22c29
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2.49.0