Re: [PATCH v3 0/4] mmc: k1: multi-block SD reads in SPL and a probe failure fix

[Zixian Zeng <sycamoremoon376@gmail.com>]

On 2026/11/1 05:54, Tanmay Kathpalia wrote:
> I am taking this series over from Dave (thanks, Dave).
> 
> Testing v2 2/3 on a Banana Pi BPI-F3 and a Milk-V Jupiter showed that
> multi-block SD reads in the SPL fail because the SD I/O rail (PMIC
> aldo1) is at 1.8 V: set_vdd_mmc() sets it, and without
> SPL_MMC_IO_VOLTAGE the MMC core never sets it back to 3.3 V. Patch 1
> lets the MMC core set the rail, patch 2 drops set_vdd_mmc(), patch 3
> is Dave's multi-block change, and patch 4 is Dave's probe error path
> fix, narrowed to the resets because, as Yixun pointed out, the clocks
> are reference counted.
> 
> Not in this version:
> - v2 1/3 (missing max-frequency). As Yixun suggested, the io clock
>    should be set up with assigned-clock-parents/rates in the DT, which
>    also works for Linux; that will follow separately. Hung-Chun has
>    withdrawn his matching RFC.
> - SPL_PINCTRL. On its own it links no K1 pinctrl driver into the SPL
>    (there is no SPL Kconfig symbol for it yet), so it would not program
>    any pads. It will follow separately once it has been tested on
>    hardware.
> 
> Testing: I do not have a K1 board, so v3 itself is build-tested only.
> The changes were tested piecewise in the v2 thread, and in each case
> multi-block SD reads in the SPL worked: Zixian enabled
> SPL_MMC_IO_VOLTAGE on a BPI-F3, Yixun dropped set_vdd_mmc() alone on
> a BPI-F3, and Hung-Chun set aldo1 to 3.3 V on a Jupiter. Zixian,
> Yixun, Hung-Chun: a Tested-by on v3 would be much appreciated.
> 
> Thanks also to Anand for testing v2.
> 
> v2: https://lore.kernel.org/u-boot/20261005T135220-0400.mmc-v2-0001.DaveWK225@protonmail.com/
> 
> Changes in v3:
> - New: configs: k1: enable SPL_MMC_IO_VOLTAGE
> - New: spacemit: k1: do not force the SD I/O rail to 1.8 V in SPL
> - v2 2/3 -> 3/4: commit message explains the BPI-F3 and Jupiter
>    failures; code unchanged
> - v2 3/3 -> 4/4: keep clk_release_bulk(), only drop
>    reset_release_bulk()
> - Drop v2 1/3
> 
> Dave Klotz (2):
>    mmc: k1: let the SPL read SD cards more than one block at a time
>    mmc: k1: do not assert the shared AXI reset on probe failure
> 
> Tanmay Kathpalia (2):
>    configs: k1: enable SPL_MMC_IO_VOLTAGE
>    spacemit: k1: do not force the SD I/O rail to 1.8 V in SPL
> 
>   arch/riscv/dts/k1-bananapi-f3-u-boot.dtsi | 10 ++++----
>   arch/riscv/dts/k1-musepi-pro-u-boot.dtsi  |  2 +-
>   board/spacemit/k1/spl.c                   | 21 -----------------
>   configs/spacemit_k1_defconfig             |  1 +
>   doc/board/spacemit/k1-spl.rst             |  1 -
>   drivers/mmc/spacemit_sdhci.c              | 28 ++++++++---------------
>   6 files changed, 17 insertions(+), 46 deletions(-)
> 

Working fine, sorry for late testing.

Tested-by: Zixian Zeng <sycamoremoon376@gmail.com> # Babanapi-F3