Hi Kevin,

On 09/02/16 02:18, Kevin Hilman wrote:
> Hello,
>
> I tried getting MMC working with linux-next (next-20160208) on
> mt8173-evb by enabling a few options[1] on top of the default defconfig,
> and this results in a kernel that hangs as soon as it starts userspace.
>
> The MMC driver seems to start, though has some regulator issues:
>
> [    0.526380] sdhci: Secure Digital Host Controller Interface driver
> [    0.527176] sdhci: Copyright(c) Pierre Ossman
> [    0.528835] vio18: unsupportable voltage range: 3300000-1980000uV
> [    0.529610] mtk-msdc 11230000.mmc: Regulator set error -22:    3300000 - 3300000
> [    0.563731] mtk-msdc 11240000.mmc: Got CD GPIO
>
> The driver appears to be attempting to set 3.3V but using a 1.8V
> regulator (vio18), which is failing.
>
> Then, the kernel hangs after freeing unused memory:
>
> [    0.616386] hctosys: unable to open rtc device (rtc0)
> [    0.624118] usb_vbus: disabling
> [    0.624547] vusb: disabling
> [    0.624929] vgp6: disabling
> [    0.625635] ALSA device list:
> [    0.626009]   No soundcards found.
> [    0.626963] Freeing unused kernel memory: 724K (ffffffc000977000 - ffffffc000a2c000)
>
> And nothing further here.
>

I can see the warning from the mmc regulator access, but after that my 
board boots just fine.
I'm using linux-next as of today (20160212).
I attached my config, it should be defconfig plus the config options you 
mentioned (and an initramfs).

Is this the configuration you have?

Regards,
Matthias

> It boots fine when disabling the MMC driver (CONFIG_MMC_MTK=n).
>
> Any ideas?
>
> Kevin
>
> [1]
> CONFIG_MMC_MTK=y
> CONFIG_MFD_MT6397=y
> CONFIG_REGULATOR_MT6397=y
> CONFIG_MTK_PMIC_WRAP=y
>