[meta-intel] Valleyisland SDIO support

[IGI/Falk Bauer]

Hello Rebecca,
thanks for your recently work with the Baytrail board. I can confirm that the image in dora branch is working with full OpenGL support.
Here is another question relating to the SDIO controller embedded into the atom processor.
In the intel specifiction update from january 2014 (http://www.intel.com/content/dam/www/public/us/en/documents/specification-updates/atom-Z36xxx-Z37xxx-spec-update.pdf) there is an entry named "VLT55 SD Card UHS - I Mode is Not Fully Supported".
We have issues here with sd cards from sandisk which are running into error messages like
**********
May 7 16:27:53 valleyisland-32 user.debug kernel: [ 125.254962] sdhci-pci 0000:00:12.0: setting latency timer to 64
May 7 16:27:55 valleyisland-32 user.info kernel: [ 127.510449] mmc1: new ultra high speed DDR50 SDHC card at address e624
May 7 16:27:55 valleyisland-32 user.info kernel: [ 127.511010] mmcblk0: mmc1:e624 SD08G 7.40 GiB
May 7 16:27:55 valleyisland-32 user.info kernel: [ 127.520193] mmcblk0: p1
May 7 16:27:55 valleyisland-32 user.err kernel: [ 127.526524] mmcblk0: error -84 transferring data, sector 15523712, nr 8, cmd response 0x900, card status 0xb00
May 7 16:27:55 valleyisland-32 user.warn kernel: [ 127.526534] mmcblk0: retrying using single block read
May 7 16:27:55 valleyisland-32 user.err kernel: [ 127.529319] mmcblk0: error -84 transferring data, sector 15523712, nr 8, cmd response 0x900, card status 0x0
May 7 16:27:55 valleyisland-32 user.warn kernel: [ 127.529329] blk_update_request: 773 callbacks suppressed
May 7 16:27:55 valleyisland-32 user.err kernel: [ 127.529335] end_request: I/O error, dev mmcblk0, sector 15523712
May 7 16:27:55 valleyisland-32 user.err kernel: [ 127.531980] mmcblk0: error -84 transferring data, sector 15523713, nr 7, cmd response 0x900, card status 0x0
May 7 16:27:55 valleyisland-32 user.err kernel: [ 127.531990] end_request: I/O error, dev mmcblk0, sector 15523713
**********

These messages appears in the kernel log buffer after inserting an sd card SanDisk Extreme 30 MB/s, class 10 UHS 1 8GB (vendor name in sysfs is SU08G).
Further investigations reveals that the error reproduce is related to the kind of sd card, filesystem on the partition aso.
I think that the errata vlt55 leads to the messages in the log. Have you experienced some similar issues with the Z3000 atom series? Or is there some plans or possibilities to disable the UHS feature for the SDIO device embedded in the atom cpu? I know that in the specification update there is currently the "no fix" entry. But maybe there is some "quick-and-dirty" fix like a "SDHCI_QUIRK2_BROKEN_UHS" define or so in the sdhci module in the kernel.
If you wish i can also fill a bug in bugzilla.

Falk

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IGI - Ingenieur-Gesellschaft fuer Interfaces mbH
Dipl.-Ing. Falk Bauer
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