On Tuesday 27 October 2009, Zhang Rui wrote:
> Introduce kernel parameter acpi_sleep=s3_set_sci_en
>
> some laptop requires SCI_EN being set directly on resume,
> or else they hung somewhere in the resume code path.
>
> We already have a blacklist for these lattops but we still need
> this option, especially when debugging some suspend/resume problems,
> in case there are systems that need this workaround and are not yet
> in the blacklist.
>
> Signed-off-by: Zhang Rui <rui.zhang@xxxxxxxxx>
I'm generally fine with this, but ...
> ---
> Documentation/kernel-parameters.txt | 5 ++++-
> arch/x86/kernel/acpi/sleep.c | 4 ++++
> drivers/acpi/sleep.c | 6 ++++++
> include/linux/acpi.h | 3 +++
> 4 files changed, 17 insertions(+), 1 deletion(-)
>
> Index: linux-2.6/drivers/acpi/sleep.c
> ===================================================================
> --- linux-2.6.orig/drivers/acpi/sleep.c
> +++ linux-2.6/drivers/acpi/sleep.c
> @@ -182,6 +182,12 @@ static void acpi_pm_end(void)
> */
> static bool set_sci_en_on_resume;
>
> +void __init acpi_set_sci_en_on_resume(void)
> +{
> + set_sci_en_on_resume = true;
> + return 0;
> +}
> +
> extern void do_suspend_lowlevel(void);
>
> static u32 acpi_suspend_states[] = {
> Index: linux-2.6/arch/x86/kernel/acpi/sleep.c
> ===================================================================
> --- linux-2.6.orig/arch/x86/kernel/acpi/sleep.c
> +++ linux-2.6/arch/x86/kernel/acpi/sleep.c
> @@ -162,6 +162,10 @@ static int __init acpi_sleep_setup(char
> #endif
> if (strncmp(str, "old_ordering", 12) == 0)
> acpi_old_suspend_ordering();
> +#ifdef CONFIG_SUSPEND
> + if (strncmp(str, "s3_set_sci_en", 13) == 0)
> + acpi_set_sci_en_on_resume();
> +#endif /* CONFIG_SUSPEND */
... do we really need these #ifdefs?
> str = strchr(str, ',');
> if (str != NULL)
> str += strspn(str, ", \t");
> Index: linux-2.6/include/linux/acpi.h
> ===================================================================
> --- linux-2.6.orig/include/linux/acpi.h
> +++ linux-2.6/include/linux/acpi.h
> @@ -251,6 +251,9 @@ int acpi_check_mem_region(resource_size_
> void __init acpi_no_s4_hw_signature(void);
> void __init acpi_old_suspend_ordering(void);
> void __init acpi_s4_no_nvs(void);
> +#ifdef CONFIG_SUSPEND
> +void __init acpi_set_sci_en_on_resume(void);
> +#endif /* CONFIG_SUSPEND*/
s4_no_nvs is hibernation-specific, but it's not under a #ifdef.
> #endif /* CONFIG_PM_SLEEP */
>
> #define OSC_QUERY_TYPE 0
> Index: linux-2.6/Documentation/kernel-parameters.txt
> ===================================================================
> --- linux-2.6.orig/Documentation/kernel-parameters.txt
> +++ linux-2.6/Documentation/kernel-parameters.txt
> @@ -241,7 +241,7 @@ and is between 256 and 4096 characters.
>
> acpi_sleep= [HW,ACPI] Sleep options
> Format: { s3_bios, s3_mode, s3_beep, s4_nohwsig,
> - old_ordering, s4_nonvs }
> + old_ordering, s4_nonvs, s3_set_sci_en }
> See Documentation/power/video.txt for information on
> s3_bios and s3_mode.
> s3_beep is for debugging; it makes the PC's speaker beep
> @@ -254,6 +254,9 @@ and is between 256 and 4096 characters.
> of _PTS is used by default).
> s4_nonvs prevents the kernel from saving/restoring the
> ACPI NVS memory during hibernation.
> + s3_set_sci_en causes the kernel to set SCI_EN directly
> + on resume from S3 (which is against the ACPI specification,
> + but some broken systems don't work without it).
>
> acpi_use_timer_override [HW,ACPI]
> Use timer override. For some broken Nvidia NF5 boards
Thanks,
Rafael
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