From mboxrd@z Thu Jan 1 00:00:00 1970 From: Zhang Rui Subject: Re: [PATCH] do not select ACPI_VIDEO in poulsbo stub driver Date: Wed, 17 Nov 2010 11:16:50 +0800 Message-ID: <1289963810.8148.2109.camel@rui> References: <4CE3E0DE0200002300024037@novprvlin0050.provo.novell.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: Received: from mga14.intel.com ([143.182.124.37]:26651 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753188Ab0KQDPK (ORCPT ); Tue, 16 Nov 2010 22:15:10 -0500 In-Reply-To: <4CE3E0DE0200002300024037@novprvlin0050.provo.novell.com> Sender: linux-acpi-owner@vger.kernel.org List-Id: linux-acpi@vger.kernel.org To: Joey Lee Cc: "mingo@elte.hu" , "lenb@kernel.org" , "airlied@redhat.com" , "linux-acpi@vger.kernel.org" , "linux-kernel@vger.kernel.org" On Wed, 2010-11-17 at 11:04 +0800, Joey Lee wrote: > Hi Rui,=20 >=20 > =E6=96=BC =E4=B8=89=EF=BC=8C2010-11-17 =E6=96=BC 08:42 +0800=EF=BC=8C= Zhang Rui =E6=8F=90=E5=88=B0=EF=BC=9A > > On Tue, 2010-11-16 at 15:34 +0800, Joey Lee wrote: > > > Hi Rui,=20 > > >=20 > > > Sorry about this patch will not work on my MSi poulsbo machine. > > >=20 > > > =E6=96=BC =E4=BA=8C=EF=BC=8C2010-11-16 =E6=96=BC 14:04 +0800=EF=BC= =8CZhang Rui =E6=8F=90=E5=88=B0=EF=BC=9A > > > > the poulsbo stub driver should not select ACPI video driver. > > > >=20 > > > > The reason why i915 driver selects ACPI video driver is that it= needs some > > > > cooperation between these two drivers during initialization, or= else the > > > > system may hang. > > > >=20 > > > > So if users want ACPI backlight control, please set CONFIG_ACPI= _VIDEO manually. > > > >=20 > > > > http://marc.info/?l=3Dlinux-acpi&m=3D128952659018533&w=3D2 > > > >=20 > > > > CC: Ingo Molnar > > > > CC: Dave Airlie > > > > CC: Lee, Chun-Yi > > > > Signed-off-by: Zhang Rui > > > > --- > > > > drivers/gpu/stub/Kconfig | 11 +---------- > > > > drivers/gpu/stub/poulsbo.c | 5 +---- > > > > 2 files changed, 2 insertions(+), 14 deletions(-) > > > >=20 > > > > Index: linux-2.6/drivers/gpu/stub/Kconfig > > > > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D > > > > --- linux-2.6.orig/drivers/gpu/stub/Kconfig > > > > +++ linux-2.6/drivers/gpu/stub/Kconfig > > > > @@ -1,16 +1,7 @@ > > > > config STUB_POULSBO > > > > tristate "Intel GMA500 Stub Driver" > > > > depends on PCI > > > > - # Poulsbo stub depends on ACPI_VIDEO when ACPI is enabled > > > > - # but for select to work, need to select ACPI_VIDEO's depende= ncies, ick > > > > - select VIDEO_OUTPUT_CONTROL if ACPI > > > > - select BACKLIGHT_CLASS_DEVICE if ACPI > > > > - select INPUT if ACPI > > > > - select ACPI_VIDEO if ACPI > > > > help > > > > Choose this option if you have a system that has Intel GMA5= 00 > > > > (Poulsbo) integrated graphics. If M is selected, the module= will > > > > - be called Poulsbo. This driver is a stub driver for Poulsbo= that > > > > - will call poulsbo.ko to enable the acpi backlight control s= ysfs > > > > - entry file because there have no poulsbo native driver can = support > > > > - intel opregion. > > > > + be called Poulsbo. > > > > Index: linux-2.6/drivers/gpu/stub/poulsbo.c > > > > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D > > > > --- linux-2.6.orig/drivers/gpu/stub/poulsbo.c > > > > +++ linux-2.6/drivers/gpu/stub/poulsbo.c > > > > @@ -11,8 +11,6 @@ > > > > =20 > > > > #include > > > > #include > > > > -#include > > > > -#include > > > > =20 > > > > #define DRIVER_NAME "poulsbo" > > > > =20 > > > > @@ -29,12 +27,11 @@ static DEFINE_PCI_DEVICE_TABLE(pciidlist > > > > =20 > > > > static int poulsbo_probe(struct pci_dev *pdev, const struct pc= i_device_id *id) > > > > { > > > > - return acpi_video_register(); > > > > + return 0; > > > > } > > >=20 > > > Sorry, we cann't remove to call acpi_video_register, because the = acpi > > > video will not generate because there have some poulsbo machine d= eclare > > > Intel opregion in DSDT but the i915 driver not support poulsbo. > > >=20 > > I'm confused. > > It's the i915 driver that supports Intel Opregion. > > i.e. for a poulsbo machine with Intel Opregion, loading ACPI video > > driver won't help neither. > >=20 >=20 > Matthew have a patch: >=20 > * http://git.kernel.org/?p=3Dlinux/kernel/git/lenb/linux-acpi-2= =2E6.git;a=3Dcommitdiff;h=3D74a365b3f354fafc537efa5867deb7a9fadbfe27 >=20 > This patch do: >=20 > - ACPI video driver will not register if it check the DSDT have opreg= ion table declare. > - i915_opregion will call acpi_video_register after it initialised th= e DIDL field in opregion. >=20 > That means acpi video driver will blocked when have opregion declare = in > DSDT until i915 drm driver call acpi_video_register. The patch fixed > BKO#11259, but introduced a side effect: If there have Intel video ch= ip > not supported by Intel drm driver, the acpi_video_register will never > called, then some machine have good acpi backlight interface > implementation will never have acpi brightness sysfs interface for > userland control. e.g. any Poulsbo netbook. >=20 > Matthew's comment to talk about the side effect: Intel IGD opregion a= nd > GMA500 >=20 > There have some machines declare opregion in DSDT but they also > implement the backlight control by EC in _BCM. Like: MSI poulsbo > netbook. > Before introduce the above patch to kernel, those machine's acpi > backlight control works fine. On current kernel, those machines > backlight control broken. >=20 > One function workable with old kernel but broken by new kernel, now. >=20 Oh, I see what the problem is. You're right, this patch doesn't make sense. Sorry for the noise. :) thanks, rui >=20 > > > That's why we add the poulsbo stub driver to enable the acpi vide= o > > > because those machine implement acpi _BCL, _BCM interace and cont= rol > > > brightness by ec. > >=20 > > I got your idea. > > I'm not sure if this is right. IMO, the graphics driver and ACPI vi= deo > > driver are independent. I mean, to enable the ACPI backlight contro= l, > > users should set CONFIG_ACPI_VIDEO explicitly. > >=20 > > And again, the reason why i915 driver selects ACPI_VIDEO is that th= e > > i915 Opregion code must run *before* ACPI video driver loaded, or e= lse > > system hangs on some machines. > > and the reason why DRM_NOUVEAU selects ACPI_VIDEO is that it depend= s on > > ACPI to get the EDID info. > >=20 >=20 > Yes, Matthew's patch fix this issue.=20 >=20 > > So I don't see a strong reason that STUB_POULSBO should select > > ACPI_VIDEO. > >=20 >=20 > Does it possible we direct remove the "select ACPI_VIDEO if ACPI" fro= m > Kconfig but keep the acpi_video_register function call in stub poulsb= o > driver? > Because acpi/video.h already handle the ACPI VIDEO config check: >=20 > #if (defined CONFIG_ACPI_VIDEO || defined CONFIG_ACPI_VIDEO_MODULE) > extern int acpi_video_register(void); > extern void acpi_video_unregister(void); > extern int acpi_video_get_edid(struct acpi_device *device, int type, > int device_id, void **edid); > #else > static inline int acpi_video_register(void) { return 0; } > static inline void acpi_video_unregister(void) { return; } >=20 >=20 > Thank's a lot! > Joey Lee >=20 > > thanks, > > rui > > >=20 > > > Here is our discussion: > > > http://www.spinics.net/lists/linux-acpi/msg30027.html > > >=20 > > > > =20 > > > > static void poulsbo_remove(struct pci_dev *pdev) > > > > { > > > > - acpi_video_unregister(); > > > > } > > > > =20 > > > > static struct pci_driver poulsbo_driver =3D { > > > >=20 > > > >=20 > > >=20 > > > I am sorry I miss understand your last mail for poulsbo stub driv= er > > > cann't dependency on input, because your patch is old. > > >=20 > > > The following is the newest patch that was send out by me: > > >=20 > > >=20 > > > >From 340b1068b20cfa152ff9992a7d69d19501b57163 Mon Sep 17 00:00:0= 0 2001 > > > From: Lee, Chun-Yi > > > Date: Wed, 15 Sep 2010 22:19:25 +0800 > > > Subject: [PATCH] Add Intel GMA500(Poulsbo) Stub Driver > > >=20 > > > Currently, there have no GMA500(Poulsbo) native video driver to s= upport > > > intel opregion. So, use this stub driver to enable the acpi backl= ight > > > control sysfs entry files by requrest acpi_video_register. > > >=20 > > > Signed-off-by: Lee, Chun-Yi > > > --- > > > drivers/gpu/Makefile | 2 +- > > > drivers/gpu/stub/Kconfig | 13 +++++++++ > > > drivers/gpu/stub/Makefile | 1 + > > > drivers/gpu/stub/poulsbo.c | 63 ++++++++++++++++++++++++++++++= ++++++++++++++ > > > drivers/video/Kconfig | 2 + > > > 5 files changed, 80 insertions(+), 1 deletions(-) > > > create mode 100644 drivers/gpu/stub/Kconfig > > > create mode 100644 drivers/gpu/stub/Makefile > > > create mode 100644 drivers/gpu/stub/poulsbo.c > > >=20 > > > diff --git a/drivers/gpu/Makefile b/drivers/gpu/Makefile > > > index 30879df..cc92778 100644 > > > --- a/drivers/gpu/Makefile > > > +++ b/drivers/gpu/Makefile > > > @@ -1 +1 @@ > > > -obj-y +=3D drm/ vga/ > > > +obj-y +=3D drm/ vga/ stub/ > > > diff --git a/drivers/gpu/stub/Kconfig b/drivers/gpu/stub/Kconfig > > > new file mode 100644 > > > index 0000000..8f5a540 > > > --- /dev/null > > > +++ b/drivers/gpu/stub/Kconfig > > > @@ -0,0 +1,13 @@ > > > +config STUB_POULSBO > > > + tristate "Intel GMA500 Stub Driver" > > > + depends on> > + # Poulsbo stub depends on ACPI_VIDEO whe= n ACPI is enabled > > > + # but for select to work, need to select ACPI_VIDEO's de= pendencies, ick > > > + select ACPI_VIDEO if ACPI > > > + help > > > + Choose this option if you have a system that has Intel GMA500 > > > + (Poulsbo) integrated graphics. If M is selected, the module w= ill > > > + be called Poulsbo. This driver is a stub driver for Poulsbo t= hat > > > + will call poulsbo.ko to enable the acpi backlight control sys= fs > > > + entry file because there have no poulsbo native driver can su= pport > > > + intel opregion. > > > diff --git a/drivers/gpu/stub/Makefile b/drivers/gpu/stub/Makefil= e > > > new file mode 100644 > > > index 0000000..cd940cc > > > --- /dev/null > > > +++ b/drivers/gpu/stub/Makefile > > > @@ -0,0 +1 @@ > > > +obj-$(CONFIG_STUB_POULSBO) +=3D poulsbo.o > > > diff --git a/drivers/gpu/stub/poulsbo.c b/drivers/gpu/stub/poulsb= o.c > > > new file mode 100644 > > > index 0000000..d8aa636 > > > --- /dev/null > > > +++ b/drivers/gpu/stub/poulsbo.c > > > @@ -0,0 +1,63 @@ > > > +/* > > > + * Intel Poulsbo Stub driver > > > + * > > > + * Copyright (C) 2010 Novell > > > + * > > > + * This program is free software; you can redistribute it and/or= modify it > > > + * under the terms of the GNU General Public License version 2 a= s published by > > > + * the Free Software Foundation. > > > + * > > > + */ > > > + > > > +#include > > > +#include > > > +#include > > > + > > > +#define DRIVER_NAME "poulsbo" > > > + > > > +enum { > > > + CHIP_PSB_8108 =3D 0, > > > + CHIP_PSB_8109 =3D 1, > > > +}; > > > + > > > +static struct pci_device_id pciidlist[] =3D { > > > + {0x8086, 0x8108, PCI_ANY_ID, PCI_ANY_ID, 0, 0, CHIP_PSB_8108}, = \ > > > + {0x8086, 0x8109, PCI_ANY_ID, PCI_ANY_ID, 0, 0, CHIP_PSB_8109}, = \ > > > + {0, 0, 0} > > > +}; > > > + > > > +static int poulsbo_probe(struct pci_dev *pdev, const struct pci_= device_id *id) > > > +{ > > > + return acpi_video_register(); > > > +} > > > + > > > +static void poulsbo_remove(struct pci_dev *pdev) > > > +{ > > > + acpi_video_unregister(); > > > +} > > > + > > > +static struct pci_driver poulsbo_driver =3D { > > > + .name =3D DRIVER_NAME, > > > + .id_table =3D pciidlist, > > > + .probe =3D poulsbo_probe, > > > + .remove =3D poulsbo_remove, > > > +}; > > > + > > > +static int __init poulsbo_init(void) > > > +{ > > > + return pci_register_driver(&poulsbo_driver); > > > +} > > > + > > > +static void __exit poulsbo_exit(void) > > > +{ > > > + pci_unregister_driver(&poulsbo_driver); > > > +} > > > + > > > +module_init(poulsbo_init); > > > +module_exit(poulsbo_exit); > > > + > > > +MODULE_AUTHOR("Lee, Chun-Yi "); > > > +MODULE_DESCRIPTION("Poulsbo Stub Driver"); > > > +MODULE_LICENSE("GPL"); > > > + > > > +MODULE_DEVICE_TABLE(pci, pciidlist); > > > diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig > > > index 8b31fdf..8807ae5 100644 > > > --- a/drivers/video/Kconfig > > > +++ b/drivers/video/Kconfig > > > @@ -17,6 +17,8 @@ source "drivers/gpu/vga/Kconfig" > > > =20 > > > source "drivers/gpu/drm/Kconfig" > > > =20 > > > +source "drivers/gpu/stub/Kconfig" > > > + > > > config VGASTATE > > > tristate > > > default n > >=20 > >=20 >=20 -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" i= n the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html