linux-kernel - Re: [2.6.25-rc1 regression] Suspend to RAM (bisected)

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Date:	Thu, 14 Feb 2008 00:00:02 -0500
From:	Len Brown <lenb@...nel.org>
To:	Venki Pallipadi <venkatesh.pallipadi@...el.com>
Cc:	"Carlos R. Mafra" <crmafra@...il.com>,
	Calvin Walton <calvin.walton@...il.com>,
	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	rjw@...k.pl
Subject: Re: [2.6.25-rc1 regression] Suspend to RAM (bisected)

Applied.

thanks,
-Len

On Monday 11 February 2008 18:20, Venki Pallipadi wrote:
> On Mon, Feb 11, 2008 at 12:06:50PM -0800, Venki Pallipadi wrote:
> > On Mon, Feb 11, 2008 at 05:37:04PM -0200, Carlos R. Mafra wrote:
> > > Pallipadi, Venkatesh wrote:
> > > > 
> > > > Can you send me the output of acpidump and full dmesg to me. Looks like
> > > > it is a platform issue due to which we cannot use C1 mwait idle during
> > > > suspend resume, something similar to issue we had with using C2/C3 state
> > > > during idle.
> > > 
> > > Full dmesg and acpidump outputs are attached.
> > 
> > Above acpidump doesnt have all info, as it is loading some SSDT at run time.
> > Can you get the output of
> > 
> > # acpidump --addr 0x7F6D8709 --length 0x000004B7
> > # acpidump --addr 0x7F6D8BC0 --length 0x00000092
> > 
> 
> Thanks for sending the dumps Carlos.
> 
> The patch below (on top of rc1) should fix the problem. Can you please
> check it.
> 
> Thanks,
> Venki
> 
> 
> Earlier patch (bc71bec91f9875ef825d12104acf3bf4ca215fa4) broke
> suspend resume on many laptops. The problem was reported by
> Carlos R. Mafra and Calvin Walton, who bisected the issue to above patch.
> 
> The problem was because, C2 and C3 code were calling acpi_idle_enter_c1
> directly, with C2 or C3 as state parameter, while suspend/resume was in
> progress. The patch bc71bec started making use of that state information,
> assuming that it would always be referring to C1 state. This caused the
> problem with suspend-resume as we ended up using C2/C3 state indirectly.
> 
> Fix this by adding acpi_idle_suspend check in enter_c1.
> 
> Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@...el.com>
> 
> Index: linux-2.6.25-rc1/drivers/acpi/processor_idle.c
> ===================================================================
> --- linux-2.6.25-rc1.orig/drivers/acpi/processor_idle.c
> +++ linux-2.6.25-rc1/drivers/acpi/processor_idle.c
> @@ -1420,6 +1420,14 @@ static int acpi_idle_enter_c1(struct cpu
>  		return 0;
>  
>  	local_irq_disable();
> +
> +	/* Do not access any ACPI IO ports in suspend path */
> +	if (acpi_idle_suspend) {
> +		acpi_safe_halt();
> +		local_irq_enable();
> +		return 0;
> +	}
> +
>  	if (pr->flags.bm_check)
>  		acpi_idle_update_bm_rld(pr, cx);
>  
> --
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