STM32 SD/MMC 4-bit bus not working

[attie-argentum]

Describe the bug I/O fails when using an STM32L476, with a Micro SD card, configured for 4-bit bus mode.

Consider the following nucleo_l476rg.overlay paired with BOARD=nucleo_l476rg and CONFIG_FILE_SYSTEM_SHELL=y.

/delete-node/ &spi3;
&sdmmc1 {
    bus-width = <1>;
    clk-div = <0>;
    pinctrl-0 = <
        &sdmmc1_ck_pc12
        &sdmmc1_cmd_pd2
        &sdmmc1_d0_pc8
        &sdmmc1_d1_pc9
        &sdmmc1_d2_pc10
        &sdmmc1_d3_pc11
    >;
    pinctrl-names = "default";
    status = "okay";
};

&clk_msi {
    msi-range = <11>; /* ~48 MHz */
    status = "okay";
};

This works fine:

uart:~$ fs mount fat /SD:
Successfully mounted fat fs:/SD:
uart:~$ fs erase_write_test /SD:/test.bin 0x100000 1
Loop #1 done in 498ms.
Total: 498ms, Per loop: ~498ms, Speed: ~2.0MiBps
uart:~$ fs read_test /SD:/test.bin 1
File size: 1.0MiB
Loop #1 done in 384ms.
Total: 384ms, Per loop: ~384ms, Speed: ~2.6MiBps

While changing to bus-width = <4>; results in an error:

uart:~$ fs mount fat /SD:
Successfully mounted fat fs:/SD:
uart:~$ fs erase_write_test /SD:/test.bin 0x100000 1
Failed to truncate /SD:/test.bin (-5)
[00:00:04.498,000] <err> stm32_sdmmc: sd write error 16
[00:00:04.498,000] <err> fs: file truncate error (-5)
[00:00:04.502,000] <err> fs: file close error (-9)

I originally tracked this down to an issue in the STM32 HAL, and the team have produced a patch that they believe works (I'm unable to verify directly at this moment).

To Reproduce Steps to reproduce the behavior:

1. Use nucleo_l476rg.overlay (below)
2. cmake -B ./build-sd -GNinja ./zephyr/samples/subsys/shell/shell_module -D BOARD=nucleo_l476rg
3. ninja -C build-sd/
4. st-flash --connect-under-reset write ./build-sd/zephyr/zephyr.bin 0x08000000
5. Execute fs mount fat /SD: in the device's shell
6. Execute fs erase_write_test /SD:/test.bin 0x100000 1, observe error

./zephyr/samples/subsys/shell/shell_module/boards/nucleo_l476rg.overlay:

/delete-node/ &spi3;
&sdmmc1 {
    bus-width = <4>;
    clk-div = <0>;
    pinctrl-0 = <
        &sdmmc1_ck_pc12
        &sdmmc1_cmd_pd2
        &sdmmc1_d0_pc8
        &sdmmc1_d1_pc9
        &sdmmc1_d2_pc10
        &sdmmc1_d3_pc11
    >;
    pinctrl-names = "default";
    status = "okay";
};

&clk_msi {
    msi-range = <11>; /* ~48 MHz */
    status = "okay";
};

Environment (please complete the following information):

• OS: Linux
• Toolchain: GCC 13.2.rel1
  • Zephyr @ f51c8ee7390
  • STM32 HAL @ 22925907 (with 4-bit patch applied manually)

[erwango]

Thanks @attie-argentum. Then, what we need is to add the proposed patch to hal_stm32. Would you have the possibility to do so ?

[attie-argentum]

Yes, sure - I can prepare a PR for hal_stm32 (though to clarify, I don't expect that to "resolve" this issue, as above)

[erwango]

wn to an issue in the STM32 HAL, and the team have produced

Ho, sorry, I read this too fast. Let's hold on then.

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