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SubjectSDIO driver not receiving responses
Hi Pierre,

I'm having problems with the latest mmc_core.ko and sdhci.ko for 2.6.24.
I've used both my development SDIO client and an off-the-shelf SDIO WIFI
card. I have a Ricoh Co Ltd R5C822 SD/SDIO/MMC/MS/MSPro Host Adapter
(rev 21).

The mmc_send_io_op_cond() function call in core.c::mmc_rescan() is
returning with a -110 (a timeout error). I traced this deeper and
noticed that CMD5 is being sent out via sdhci.c::sdhci_send_command() (I
verified this using a logic analyser, the host *is* transmitting a CMD5
[IO_SEND_OP_COND] packet in the correct format). However, when the
client responds with the IO_SEND_OP_COND Response R4 (SD mode), it does
not seem to be received by the host. Again, I verified using the logic
analyser that the response is as would be expected. An IRQ *is*
triggered, however it is 0x00018000 (SDHCI_INT_TIMEOUT|SDHCI_INT_ERROR).
I'm not too familiar with Linux kernel programming but I suspect that
whatever is waiting for a valid response is giving up instead and
triggering the above-mentioned interrupt instead.

# lspci -v -s 15:00.2 -xxx
15:00.2 Generic system peripheral [0805]: Ricoh Co Ltd R5C822
SD/SDIO/MMC/MS/MSPro Host Adapter (rev 21)
Subsystem: Lenovo Unknown device 20c8
Flags: medium devsel, IRQ 23
Memory at f8101800 (32-bit, non-prefetchable) [size=256]
Capabilities: [80] Power Management version 2
00: 80 11 22 08 02 00 10 02 21 00 05 08 00 40 80 00
10: 00 18 10 f8 00 00 00 00 00 00 00 00 00 00 00 00
20: 00 00 00 00 00 00 00 00 00 00 00 00 aa 17 c8 20
30: 00 00 00 00 80 00 00 00 00 00 00 00 0b 03 00 00
40: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
50: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
60: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
80: 01 00 02 fe 00 40 00 48 00 00 00 00 00 00 00 00
90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
a0: 00 00 00 00 00 00 00 00 00 00 00 00 aa 17 c8 20
b0: 04 00 02 00 00 00 00 00 00 00 00 00 a0 00 00 00
c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
e0: a1 21 e0 01 00 00 00 00 40 00 00 00 00 00 00 00
f0: 00 00 00 00 00 00 00 00 d0 00 20 02 00 00 00 00

*** An interesting thing is, when I try to printk() values in the above
table through the driver, I don't get identical values. I do this using
the following code:
for (i = 0; i < 16; i++)
{
for (k = 0; k < 16; k++)
{
printk("%02x ", readb(host->ioaddr + (i*16) + k));
}
printk("\n");
}

Why would the output of the above code differ from the one produced by
lspci -xxx. Could this have something to do with this issue???

host->ioaddr is set to 0xF8A84800 (which is the output of
ioremap_nocache(0xF8101800, 256)

Sections of /var/log/messages:
sdhci: SDHCI controller found at 0000:15:00.2 [1180:0822] (rev 21)
sdhci [sdhci_probe()]: found 1 slot(s)
ACPI: PCI Interrupt 0000:15:00.2[C] -> GSI 18 (level, low) -> IRQ 22
sdhci [sdhci_probe_slot()]: slot 0 at 0xf8101800, irq 22


I'm fresh out of ideas on this one and would greatly appreciate some
hints or assistance. I'm happy to provide any further information if needed.

Regards
Farbod Nejati


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