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    SubjectRe: Lock-up with modprobe sdhci after suspending to ram
    Jani-Matti Hätinen wrote:
    > Ok, this is what I get on Loglevel 9.
    > If I try to suspend with the module loaded and with a card in the reader I
    > get:
    > Stopping tasks: ================================|
    > ipw2200: Failed to send CARD_DISABLE: Command timed out
    > ACPI: PCI interrupt for device 0000:01:05.0 disabled
    > sdhci [sdhci_suspend()]: Suspending...
    > MMC: starting cmd 07 arg 00000000 flags 00000000
    > sdhci [sdhci_send_command()]: Sending cmd (7)
    > And if I modprobe sdhci after suspend&resume I get the following:
    > First from the modprobe (not all of it is visible):
    > sdhci: Sys addr: 0xffffffff | Version: 0x0000ffff
    > sdhci: Blk size: 0x0000ffff | Blk cnt: 0x0000ffff
    > sdhci: Argument: 0xffffffff | Trn mode: 0x0000ffff
    > sdhci: Present: 0xffffffff | Host ctl: 0x000000ff
    > sdhci: Power: 0x000000ff | Blk gap: 0x000000ff
    > sdhci: Wake-up: 0x000000ff | Clock: 0x0000ffff
    > sdhci: Timeout: 0x000000ff | Int stat: 0xffffffff
    > sdhci: Int enab: 0xffffffff | Sig enab: 0xffffffff
    > sdhci: AC12 err: 0x0000ffff | Slot int: 0x0000ffff
    > sdhci: Caps: 0xffffffff | Max curr: 0xffffffff
    > sdhci: ===========================================

    Now this is horribly broken and would explain why things go south. I
    guess the chip needs a reset early in the detection sequence to function
    properly. Try putting:

    sdhci_reset(host, SDHCI_RESET_ALL);

    just before the driver does a readl() on the capabilities register (in

    > Also I just noticed that if the machine has been through at least one
    > suspend&resume cycle, rebooting no longer works. All processes exit cleanly,
    > but the system just hangs when it should shut down.

    That's just probably a broken ACPI. Laptops tend to be buggy as hell.
    File a report with the ACPI guys.


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