[MX25][MMC] mmc esdhc failure in 3.3-rc5

[joancarles at fqingenieria.es]

Hi

I have the following error when trying to access the SD-card on my MX25
device:

root at mx25-noah:~$> mount /media/card/
root at mx25-noah:~$> df -kh /media/card
Filesystem                Size      Used Available Use% Mounted on
/dev/mmcblk0p1          123.6M      2.7M    120.9M   2% /media/card
root at mx25-noah:~$> touch /media/card/file
[   82.982920] mmcblk0: error -110 transferring data, sector 559, nr 1,
cmd response 0x900, card status 0x0
[   82.993544] end_request: I/O error, dev mmcblk0, sector 559
[   82.999169] Buffer I/O error on device mmcblk0p1, logical block 497
[   83.005458] lost page write due to I/O error on mmcblk0p1
[   83.013922] mmcblk0: error -84 transferring data, sector 559, nr 1, cmd
response 0x900, card status 0x0
[   83.024114] end_request: I/O error, dev mmcblk0, sector 559
[   83.029965] FAT-fs (mmcblk0p1): Directory bread(block 497) failed
[   83.038051] mmcblk0: error -84 transferring data, sector 560, nr 1, cmd
response 0x900, card status 0x0
[   83.048579] end_request: I/O error, dev mmcblk0, sector 560
[   83.054205] Buffer I/O error on device mmcblk0p1, logical block 498
[   83.060494] lost page write due to I/O error on mmcblk0p1
touch: /media/card/file: Input/output error

I have compiled the kernel 3.3-rc5 with driver core debug support and I
get the following information:

root at mx25-noah:~$> dmesg | grep -i mmc
[    0.228098] bus: 'mmc': registered
[    0.228139] device class 'mmc_host': registering
[    1.405180] bus: 'mmc': add driver mmcblk
[    1.429969] device: 'mmc0::': device_add
[    1.430249] PM: Adding info for No Bus:mmc0::
[    1.430837] Registered led device: mmc0::
[    1.430884] device: 'mmc0': device_add
[    1.431114] PM: Adding info for No Bus:mmc0
[    1.432953] mmc0: SDHCI controller on sdhci-esdhc-imx25.0
[sdhci-esdhc-imx25.0] using DMA
[    1.771322] mmc0: host does not support reading read-only switch.
assuming write-enable.
[    1.798584] mmc0: new high speed SD card at address 0002
[    1.804018] device: 'mmc0:0002': device_add
[    1.804283] bus: 'mmc': add device mmc0:0002
[    1.804445] PM: Adding info for mmc:mmc0:0002
[    1.815198] bus: 'mmc': driver_probe_device: matched device mmc0:0002
with driver mmcblk
[    1.815256] bus: 'mmc': really_probe: probing driver mmcblk with device
mmc0:0002
[    1.825154] mmcblk0: mmc0:0002 00000 1.86 GiB
[    1.835076] device: 'mmcblk0': device_add
[    1.835680] PM: Adding info for No Bus:mmcblk0
[    1.849286]  mmcblk0: p1 p2
[    1.852252] device: 'mmcblk0p1': device_add
[    1.855232] PM: Adding info for No Bus:mmcblk0p1
[    1.855371] device: 'mmcblk0p2': device_add
[    1.855874] PM: Adding info for No Bus:mmcblk0p2
[    1.866667] driver: 'mmc0:0002': driver_bound: bound to device 'mmcblk'
[    1.866720] bus: 'mmc': really_probe: bound device mmc0:0002 to driver
mmcblk
[   82.982920] mmcblk0: error -110 transferring data, sector 559, nr 1,
cmd response 0x900, card status 0x0
[   82.993544] end_request: I/O error, dev mmcblk0, sector 559
[   82.999169] Buffer I/O error on device mmcblk0p1, logical block 497
[   83.005458] lost page write due to I/O error on mmcblk0p1
[   83.013922] mmcblk0: error -84 transferring data, sector 559, nr 1, cmd
response 0x900, card status 0x0
[   83.024114] end_request: I/O error, dev mmcblk0, sector 559
[   83.029965] FAT-fs (mmcblk0p1): Directory bread(block 497) failed
[   83.038051] mmcblk0: error -84 transferring data, sector 560, nr 1, cmd
response 0x900, card status 0x0
[   83.048579] end_request: I/O error, dev mmcblk0, sector 560
[   83.054205] Buffer I/O error on device mmcblk0p1, logical block 498
[   83.060494] lost page write due to I/O error on mmcblk0p1

The same device booted into a 2.6.39.3 kernel works just fine. The
initialization of the esdhc driver in the device section is as follows:

imx25_add_sdhci_esdhc_imx(0, NULL);

Changing it to a pdata init as shown below does not change anything with
regard to the failure:

imx25_add_sdhci_esdhc_imx(0, &noah_esdhc_pdata);
static const struct esdhc_platform_data noah_esdhc_pdata __initconst = {
        .wp_gpio = -EINVAL,
        .cd_gpio = -EINVAL,
        .wp_type = ESDHC_WP_NONE,
        .cd_type = ESDHC_CD_NONE,
};

What could have changed between 2.6.39.3 and 3.3-rc5 to trigger this
behaviour? A quick look at

git diff v2.6.39 drivers/mmc/host/sdhci-esdhc-imx.c

only confuses me with regard to this issue.

Regards
Joan Carles