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

Message ID 20250422204413.272679-1-jm@ti.com
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Series Add ti,suppress-v1p8-ena | expand

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Judith Mendez April 22, 2025, 8:44 p.m. UTC 
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

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