I filed
6718193 ultra 20 resume fails to resume sata disk
which might be related.
Joe Townsend
J?rgen Keil wrote:
> Can anyone reproduce a hanging system when trying to use S3 suspend-to-ram,
> immediately after the first uhci driver instance gets suspended?
> Most likely this is an issue only on systems where uhci is sharing
> it's interrupt vector with other devices.
>
> My Toshiba Tecra S1 laptop used to be able to enter S3 suspend-to-ram
> mode.6718193 ultra 20 resume fails to resume sata disk -filed
>
>
> Seems that since the putback for 6681221 "Solaris hangs during early boot
> when EHCI-2 is enabled from BIOS" S3-suspend is broken. As soon as the first
> uhci controller gets suspended (uhci0), system hangs (with an interrupt
> storm?).
> The laptop doesn't reach S3-STR state any more.
>
> There is an interrupt pending for uhci0 (intr_status == 1), but interrupts
> are supposed to be disabled (intr_reg == 0), so the code returns from
> uhci_intr without acknowledging the pending interrupt (lines 954 - 952 in
> uhci.c) .
> Interrupt handler is immediately re-entered; there's no more progress with
> S3-suspend.
>
> usr/src/uts/common/io/usb/hcd/uhci/uhci.c:
> 940 /* Get the status of the interrupts */
> 941 intr_status = Get_OpReg16(USBSTS);
> 942 intr_reg = Get_OpReg16(USBINTR);
> 943
> 944 USB_DPRINTF_L3(PRINT_MASK_INTR, uhcip->uhci_log_hdl,
> 945 "uhci_intr: intr_status = %x, intr_reg = %x",
> 946 intr_status, intr_reg);
> 947
> 948 /*
> 949 * If uhci interrupts are all disabled, the driver should
> return
> 950 * unclaimed.
> 951 * HC Process Error and Host System Error interrupts cannot be
> 952 * disabled by intr register, and need to be judged
> separately.
> 953 */
> 954 if (((intr_reg & ENABLE_ALL_INTRS) == 0) &&
> 955 ((intr_status & USBSTS_REG_HC_PROCESS_ERR) == 0) &&
> 956 ((intr_status & USBSTS_REG_HOST_SYS_ERR) == 0)) {
> 957
> 958 USB_DPRINTF_L3(PRINT_MASK_INTR, uhcip->uhci_log_hdl,
> 959 "uhci_intr: interrupts disabled, unclaim");
> 960 mutex_exit(&uhcip->uhci_int_mutex);
> 961
> 962 return (DDI_INTR_UNCLAIMED);
> 963 }
> --
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