From: Dave Airlie <airlied@gmail.com>
To: Seth Forshee <seth.forshee@canonical.com>
Cc: dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org,
David Airlie <airlied@linux.ie>, Matthew Garrett <mjg@redhat.com>,
Daniel Vetter <daniel.vetter@ffwll.ch>,
Andreas Heider <andreas@meetr.de>
Subject: Re: [PATCH 0/7] Fixes for hybrid graphics Apple machines
Date: Fri, 7 Sep 2012 22:35:04 +0100 [thread overview]
Message-ID: <CAPM=9tyHodSp0BCdU4Bz=95JXhiiswYRTAre6LyQjiV023UXCw@mail.gmail.com> (raw)
In-Reply-To: <1347031330-19657-1-git-send-email-seth.forshee@canonical.com>
On Fri, Sep 7, 2012 at 4:22 PM, Seth Forshee <seth.forshee@canonical.com> wrote:
> Many hybrid graphics Apple laptops fail to set up LVDS on the secondary
> GPU due to missing or incorrect mode information for the panel at init
> time. The only way to get the LVDS mode on these machines is via the
> DDC, but this is muxed to the active GPU at boot. However, the graphics
> mux on these machines supports muxing the i2c idependently of the
> display, making it possible for the secondary graphics driver to read
> the EDID without a full display switch.
>
> In order to support this, these patches modify vga_switcheroo to allow
> muxing of the DDC idependently of the display. apple-gmux is updated to
> support this new functionality, and drm_get_edid() is modified to switch
> the DDC mux as needed.
>
> For this to work we also need to ensure that sufficient switcheroo
> suport is available before initializing the secondary GPU. This is done
> by adding any non-active GPUs that try to initialize before switcheroo
> is ready to a list and initializing these devices once switcheroo
> becomes ready. This behavior is restricted to Apple laptops to prevent
> causing problems on other machines.
I hate this idea, no delaying stuff. We either need to have some sort
of enforced ordering or make some stuff only work built-in.
But sticking things on a delayed list just in case seems wrong to me.
Dave.
next prev parent reply other threads:[~2012-09-07 21:35 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-07 15:22 [PATCH 0/7] Fixes for hybrid graphics Apple machines Seth Forshee
2012-09-07 15:22 ` [PATCH 1/7] vga_switcheroo: Add support for switching only the DDC Seth Forshee
2012-09-07 15:22 ` [PATCH 2/7] vga_switcheroo: Add helper function to get the active client Seth Forshee
2012-09-07 15:22 ` [PATCH 3/7] vga_switcheroo: Add notifier call chain for switcheroo events Seth Forshee
2012-09-07 15:22 ` [PATCH 4/7] apple-gmux: Add switch_ddc support Seth Forshee
2012-09-07 15:22 ` [PATCH 5/7] drm/edid: Switch DDC when reading the EDID Seth Forshee
2012-09-07 15:22 ` [PATCH 6/7] drm/pci: Add drm_put_pci_dev() Seth Forshee
2012-09-07 15:22 ` [PATCH 7/7] drm/pci: Defer initialization of secondary graphics devices until switcheroo is ready Seth Forshee
2012-09-07 21:35 ` Dave Airlie [this message]
2012-09-08 5:07 ` [PATCH 0/7] Fixes for hybrid graphics Apple machines Seth Forshee
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