mt1873-evb: MMC failing with linux-next

Hi,

I just resend as the attachment was to too big for linux-arm-kernel.

On 12/02/16 16:24, Matthias Brugger wrote:

Hi Kevin,

On 09/02/16 02:18, Kevin Hilman wrote:

quoted

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).

Instead of attaching my config, you can find it here:
http://pastebin.com/5uhXtSHj

Is this the configuration you have?

Regards,
Matthias

quoted

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