Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1711767 > unrolled thread

RE: [PATCH 3/3] ACPI / scan: Enable GPEs before scanning the namespace

Started by"Zheng, Lv" <lv.zheng@intel.com>
First post2017-08-15 04:20 +0200
Last post2017-08-17 04:30 +0200
Articles 3 — 2 participants

Back to article view | Back to linux.kernel

This discussion starts older than the indexed window; earlier articles aren't shown. The article labeled Started by below is the oldest one visible, not the original post.

Contents

  RE: [PATCH 3/3] ACPI / scan: Enable GPEs before scanning the  namespace "Zheng, Lv" <lv.zheng@intel.com> - 2017-08-15 04:20 +0200
    Re: [PATCH 3/3] ACPI / scan: Enable GPEs before scanning the namespace "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2017-08-15 14:40 +0200
      RE: [PATCH 3/3] ACPI / scan: Enable GPEs before scanning the  namespace "Zheng, Lv" <lv.zheng@intel.com> - 2017-08-17 04:30 +0200

#1711767 — RE: [PATCH 3/3] ACPI / scan: Enable GPEs before scanning the namespace

From"Zheng, Lv" <lv.zheng@intel.com>
Date2017-08-15 04:20 +0200
SubjectRE: [PATCH 3/3] ACPI / scan: Enable GPEs before scanning the namespace
Message-ID<uezCx-3JS-1@gated-at.bofh.it>
Hi, Rafael

> From: linux-acpi-owner@vger.kernel.org [mailto:linux-acpi-owner@vger.kernel.org] On Behalf Of Rafael J.
> Wysocki
> Subject: [PATCH 3/3] ACPI / scan: Enable GPEs before scanning the namespace
> 
> From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
> 
> On some systems the platform firmware expects GPEs to be enabled
> before the enumeration of devices and if that expectation is not
> met, the systems in question may not boot in some situations.
> 
> For this reason, change the initialization ordering of the ACPI
> subsystem to make it enable GPEs before scanning the namespace
> for the first time in order to enumerate devices.
> 
> Reported-by: Mika Westerberg <mika.westerberg@linux.intel.com>
> Suggested-by: Mika Westerberg <mika.westerberg@linux.intel.com>
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
> ---
>  drivers/acpi/scan.c |    8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> Index: linux-pm/drivers/acpi/scan.c
> ===================================================================
> --- linux-pm.orig/drivers/acpi/scan.c
> +++ linux-pm/drivers/acpi/scan.c
> @@ -2139,6 +2139,10 @@ int __init acpi_scan_init(void)
>  			acpi_get_spcr_uart_addr();
>  	}
> 
> +	acpi_gpe_apply_masked_gpes();
> +	acpi_update_all_gpes();
> +	acpi_ec_ecdt_start();
> +

Just for your information.
A recent internal bug reveals that acpi_ec_ecdt_start() should only be
invoked after the enumeration (acpi_ec_add()) for now.
The function contains logics that need to be altered by acpi_ec_add().

So it seems we can only do less aggressive change by moving the GPE
related 2 lines up.

Thanks and best regards
Lv

>  	mutex_lock(&acpi_scan_lock);
>  	/*
>  	 * Enumerate devices in the ACPI namespace.
> @@ -2163,10 +2167,6 @@ int __init acpi_scan_init(void)
>  		}
>  	}
> 
> -	acpi_gpe_apply_masked_gpes();
> -	acpi_update_all_gpes();
> -	acpi_ec_ecdt_start();
> -
>  	acpi_scan_initialized = true;
> 
>   out:
> 
> 
> --
> To unsubscribe from this list: send the line "unsubscribe linux-acpi" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html

[toc] | [next] | [standalone]

#1712142 — Re: [PATCH 3/3] ACPI / scan: Enable GPEs before scanning the namespace

From"Rafael J. Wysocki" <rjw@rjwysocki.net>
Date2017-08-15 14:40 +0200
SubjectRe: [PATCH 3/3] ACPI / scan: Enable GPEs before scanning the namespace
Message-ID<ueJix-1jm-1@gated-at.bofh.it>
In reply to#1711767
On Tuesday, August 15, 2017 4:12:24 AM CEST Zheng, Lv wrote:
> Hi, Rafael
> 
> > From: linux-acpi-owner@vger.kernel.org [mailto:linux-acpi-owner@vger.kernel.org] On Behalf Of Rafael J.
> > Wysocki
> > Subject: [PATCH 3/3] ACPI / scan: Enable GPEs before scanning the namespace
> > 
> > From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
> > 
> > On some systems the platform firmware expects GPEs to be enabled
> > before the enumeration of devices and if that expectation is not
> > met, the systems in question may not boot in some situations.
> > 
> > For this reason, change the initialization ordering of the ACPI
> > subsystem to make it enable GPEs before scanning the namespace
> > for the first time in order to enumerate devices.
> > 
> > Reported-by: Mika Westerberg <mika.westerberg@linux.intel.com>
> > Suggested-by: Mika Westerberg <mika.westerberg@linux.intel.com>
> > Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
> > ---
> >  drivers/acpi/scan.c |    8 ++++----
> >  1 file changed, 4 insertions(+), 4 deletions(-)
> > 
> > Index: linux-pm/drivers/acpi/scan.c
> > ===================================================================
> > --- linux-pm.orig/drivers/acpi/scan.c
> > +++ linux-pm/drivers/acpi/scan.c
> > @@ -2139,6 +2139,10 @@ int __init acpi_scan_init(void)
> >  			acpi_get_spcr_uart_addr();
> >  	}
> > 
> > +	acpi_gpe_apply_masked_gpes();
> > +	acpi_update_all_gpes();
> > +	acpi_ec_ecdt_start();
> > +
> 
> Just for your information.
> A recent internal bug reveals that acpi_ec_ecdt_start() should only be
> invoked after the enumeration (acpi_ec_add()) for now.
> The function contains logics that need to be altered by acpi_ec_add().
> 
> So it seems we can only do less aggressive change by moving the GPE
> related 2 lines up.

OK, done.

Please check my linux-next branch and see if that's what it should be.

Thanks,
Rafael

[toc] | [prev] | [next] | [standalone]

#1713484

From"Zheng, Lv" <lv.zheng@intel.com>
Date2017-08-17 04:30 +0200
Message-ID<ufiJk-6RK-17@gated-at.bofh.it>
In reply to#1712142
Hi, Rafael

> From: Rafael J. Wysocki [mailto:rjw@rjwysocki.net]
> Subject: Re: [PATCH 3/3] ACPI / scan: Enable GPEs before scanning the namespace
> 
> On Tuesday, August 15, 2017 4:12:24 AM CEST Zheng, Lv wrote:
> > Hi, Rafael
> >
> > > From: linux-acpi-owner@vger.kernel.org [mailto:linux-acpi-owner@vger.kernel.org] On Behalf Of
> Rafael J.
> > > Wysocki
> > > Subject: [PATCH 3/3] ACPI / scan: Enable GPEs before scanning the namespace
> > >
> > > From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
> > >
> > > On some systems the platform firmware expects GPEs to be enabled
> > > before the enumeration of devices and if that expectation is not
> > > met, the systems in question may not boot in some situations.
> > >
> > > For this reason, change the initialization ordering of the ACPI
> > > subsystem to make it enable GPEs before scanning the namespace
> > > for the first time in order to enumerate devices.
> > >
> > > Reported-by: Mika Westerberg <mika.westerberg@linux.intel.com>
> > > Suggested-by: Mika Westerberg <mika.westerberg@linux.intel.com>
> > > Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
> > > ---
> > >  drivers/acpi/scan.c |    8 ++++----
> > >  1 file changed, 4 insertions(+), 4 deletions(-)
> > >
> > > Index: linux-pm/drivers/acpi/scan.c
> > > ===================================================================
> > > --- linux-pm.orig/drivers/acpi/scan.c
> > > +++ linux-pm/drivers/acpi/scan.c
> > > @@ -2139,6 +2139,10 @@ int __init acpi_scan_init(void)
> > >  			acpi_get_spcr_uart_addr();
> > >  	}
> > >
> > > +	acpi_gpe_apply_masked_gpes();
> > > +	acpi_update_all_gpes();
> > > +	acpi_ec_ecdt_start();
> > > +
> >
> > Just for your information.
> > A recent internal bug reveals that acpi_ec_ecdt_start() should only be
> > invoked after the enumeration (acpi_ec_add()) for now.
> > The function contains logics that need to be altered by acpi_ec_add().
> >
> > So it seems we can only do less aggressive change by moving the GPE
> > related 2 lines up.
> 
> OK, done.
> 
> Please check my linux-next branch and see if that's what it should be.

I confirmed.
And refreshed my EC regression fix on top of that with v2 tagged in the subjects.

Thanks and best regards
Lv

[toc] | [prev] | [standalone]

Back to top | Article view | linux.kernel

csiph-web