mmci.c regression

[Roland Stigge <stigge@antcom.de>]

Hi,

I'm getting a strange regression with mmci.c at v3.5-rc4 -> v3.5-rc5: Bootup:

v3.5-rc4:

mmci-pl18x 20098000.sd: mmc0: PL180 manf 41 rev0 at 0x20098000 irq 15,13 (pio)
mmci-pl18x 20098000.sd: no DMA platform data
mmc0: new SD card at address bd34
mmcblk0: mmc0:bd34 SD02G 1.83 GiB 
mmcblk0: error -5 transferring data, sector 0, nr 8, cmd response 0x900, card status 0xb00
mmcblk0: retrying using single block read
 mmcblk0: p1

v3.5-rc5:

mmci-pl18x 20098000.sd: mmc0: PL180 manf 41 rev0 at 0x20098000 irq 15,13 (pio)
mmci-pl18x 20098000.sd: no DMA platform data
mmc0: new SD card at address bd34
mmcblk0: mmc0:bd34 SD02G 1.83 GiB 
mmcblk0: error -5 transferring data, sector 0, nr 8, cmd response 0x0, card status 0x900
mmcblk0: retrying using single block read
mmcblk0: error -5 transferring data, sector 0, nr 8, cmd response 0x0, card status 0x0
end_request: I/O error, dev mmcblk0, sector 0
mmcblk0: error -5 transferring data, sector 1, nr 7, cmd response 0x0, card status 0x0
end_request: I/O error, dev mmcblk0, sector 1
mmcblk0: error -5 transferring data, sector 2, nr 6, cmd response 0x0, card status 0x0
end_request: I/O error, dev mmcblk0, sector 2
Buffer I/O error on device mmcblk0, logical block 0
 mmcblk0: unable to read partition table

This happens on bootup with _some_ cards that already have the "error -5" in v3.5-rc4. This
was ok where up to v3.5-rc4, it worked on a subsequent retry as above. Unfortunately, it
now fails with v3.5-rc5.

Unfortunately, I can't see a relevant change in the mmci driver or mmc host code.
An indirect timing issue on bootup?

Inserting cards _after_ bootup generally works. SoC is LPC32XX.

Thanks in advance.

Roland