Re: mmc only working when used in U-Boot

[Stefan Roese <stefan.roese@gmail.com>]

On 17.12.2013 14:48, Balaji T K wrote:
> On Tuesday 17 December 2013 07:11 PM, Stefan Roese wrote:
>> Hi!
>>
>> I've noticed on a custom OMAP3530 board, that the SDcard (mmc1) is only
>> detected, when its previously used in U-Boot (e.g. by "mmc rescan"). So
>> I tested on beagleboard and it behaved identical.
>>
>> Here the boot log with U-Boot scanning mmc before Linux booting:
>>
>> root@generic-armv7a:~# dmesg | grep mmc
>> [    2.225006] of_get_named_gpiod_flags: can't parse gpios property of node '/ocp/mmc@4809c000[0]'
>> [    2.234100] of_get_named_gpiod_flags: can't parse gpios property of node '/ocp/mmc@4809c000[0]'
>> [    2.260040] omap_hsmmc 4809c000.mmc: pins are not configured from the driver
>> [    2.398071] mmc0: host does not support reading read-only switch. assuming write-enable.
>> [    2.408416] mmc0: new high speed SD card at address 0007
>> [    2.419128] mmcblk0: mmc0:0007 SD02G 1.90 GiB
>> [    2.426025]  mmcblk0: p1 p2
>> [   10.241638] EXT4-fs (mmcblk0p2): mounted filesystem with ordered data mode. Opts: (null)
>> [   10.256011] FAT-fs (mmcblk0p1): Volume was not properly unmounted. Some data may be corrupt. Please run fsck.
>>
>> Here the boot log without U-Boot touching mmc before Linux booting:
>>
>> root@generic-armv7a:~# dmesg | grep mmc
>> [    2.162689] of_get_named_gpiod_flags: can't parse gpios property of node '/ocp/mmc@4809c000[0]'
>> [    2.171936] of_get_named_gpiod_flags: can't parse gpios property of node '/ocp/mmc@4809c000[0]'
>> [    2.197906] omap_hsmmc 4809c000.mmc: pins are not configured from the driver
>>
>> I also added the pin mux'es for the mmc to the dts and the last message
>> is gone. But this doesn't help with mmc detection.
>>
>> BTW: This is on latest mainline Linux.
>>
>> Somehow U-Boot configured/enables something that is missing in the
>> Linux driver. Is this a known issue? Any ideas?
>>
> 
> If you are using dt boot, mostly likely it is because of missing pbias
> configuration.

Ah, yes. I had already tried with your 7 patches series (v4). But it
seems that I forgot to add CONFIG_MFD_SYSCON and CONFIG_REGULATOR_PBIAS.
With this now, the SD card is detected even without any U-Boot activity.

Thanks,
Stefan