linux-kernel - Re: [PATCH] Add Intel Poulsbo Stub Driver

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Date:	Fri, 10 Sep 2010 04:03:45 -0600
From:	"Joey Lee" <jlee@...ell.com>
To:	<mjg59@...f.ucam.org>
Cc:	<randy.dunlap@...cle.com>, <mjg@...hat.com>, <gregkh@...e.de>,
	<trenn@...e.de>, <linux-acpi@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <Dennis.Jansen@....de>
Subject: Re: [PATCH] Add Intel Poulsbo Stub Driver

Hi Matthew, 

於 四，2010-09-09 於 22:36 -0600，Joey Lee 提到：
> Hi Randy, 
> 
> First, thank's for your review!
> And, sorry I am late to reply the mail.
> 
> 於 三，2010-09-01 於 10:11 -0700，Randy Dunlap 提到：
> > On Wed,  1 Sep 2010 17:08:39 +0800 Lee, Chun-Yi wrote:
> > 
> > > Currently, there have no Poulsbo native video driver to support
> > > intel opregion. So, use this stub driver to enable the acpi backlight
> > > control sysfs entry files by requrest acpi_video_register.
> > > 
> > > Signed-off-by: Lee, Chun-Yi <jlee@...ell.com>
> > > ---
> > >  drivers/gpu/Makefile       |    2 +-
> > >  drivers/gpu/stub/Kconfig   |   13 +++++++++
> > >  drivers/gpu/stub/Makefile  |    1 +
> > >  drivers/gpu/stub/poulsbo.c |   64 ++++++++++++++++++++++++++++++++++++++++++++
> > >  drivers/video/Kconfig      |    2 +
> > >  5 files changed, 81 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
> > > 
> > > 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			+= drm/ vga/
> > > +obj-y			+= drm/ vga/ stub/
> > > diff --git a/drivers/gpu/stub/Kconfig b/drivers/gpu/stub/Kconfig
> > > new file mode 100644
> > > index 0000000..c564140
> > > --- /dev/null
> > > +++ b/drivers/gpu/stub/Kconfig
> > > @@ -0,0 +1,13 @@
> > > +config STUB_POULSBO
> > > +	tristate "Intel Poulsbo Stub Driver"
> > > +        default m
> > 
> > Drop the "default m".
> > 
> 
> Thank's! Will drop "default m".
> 
> > > +        # Poulsbo stub depends on ACPI_VIDEO when ACPI is enabled
> > > +        # but for select to work, need to select ACPI_VIDEO's dependencies, ick
> > > +        select ACPI_VIDEO if ACPI
> > 
> > What does it do when ACPI is not enabled?  Does the driver even build
> > when APCI is not enabled?  (given the acpi_video* calls in it)
> > 
> 
> This driver will not do anything if API is not enabled. It only call
> acpi_video_register/acpi_video_unregister, and acpi/video.h handle it
> like the following:
> 
> #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; }
> static inline int acpi_video_get_edid(struct acpi_device *device, int
> type,
>                                       int device_id, void **edid)
> {
>         return -ENODEV;
> }
> #endif
> 
> So, I think don't need add "depends on ACPI_VIDEO". How do you think?
> 
> > It also has pci_* calls in it, so it looks like it needs to depend
> > on PCI && ACPI, or at least on PCI.
> > 
> > 
> Yes, thank's for your review, I will add:
> 	depends on PCI
> 

Thank's for Greg and Randy's review, and I follow their suggestions to
modified patch like the attacted file.

Please kindly help to review my attached patch.


Thank's a lot!
Joey Lee


View attachment "0001-Add-Intel-Poulsbo-Stub-Driver.patch" of type "text/plain" (3998 bytes)