linux-kernel - [RFC PATCH 0/5] i915 changes for hybrid graphics support on Macbooks

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Date:	Fri,  3 Aug 2012 11:02:16 -0500
From:	Seth Forshee <seth.forshee@...onical.com>
To:	dri-devel@...ts.freedesktop.org
Cc:	Daniel Vetter <daniel.vetter@...ll.ch>,
	David Airlie <airlied@...ux.ie>, linux-kernel@...r.kernel.org,
	Matthew Garrett <mjg59@...f.ucam.org>,
	Andreas Heider <andreas@...tr.de>
Subject: [RFC PATCH 0/5] i915 changes for hybrid graphics support on Macbooks

The following patches are part of a larger series I've been working on
to get vga_switcheroo working on hybrid graphics Macbooks. Some of these
machines are not providing a VBT, and since the LVDS panel is connected
to the discrete GPU at boot we can't get a mode for the panel during
initialization. As a result the LVDS connector is not registered with
DRM, and graphics switching is not possible.

These patches fix this issue by registering the connector even if we
can't get a mode for the panel. If we don't have an EDID we check again
from the vga_switcheroo reprobe callback.

This is working, except for the framebuffer console which isn't
displaying when switched to the integrated GPU, which I still need to
debug. I'm not entirely sure whether or not this is the correct approach
though, so I wanted to go ahead and get some feedback on the patches now
to make sure I'm on the right track.

Thanks,
Seth

Andreas Heider (1):
  drm/i915: Add support for vga_switcheroo reprobe

Seth Forshee (4):
  drm/i915: separate out code to get EDID from LVDS panel
  drm/i915: register LVDS connector even if we can't get a panel mode
  drm/i915: make intel_lvds_get_edid() more robust
  drm/i915: check LVDS for EDID on GPU switches

 drivers/gpu/drm/i915/i915_dma.c   |    9 ++-
 drivers/gpu/drm/i915/intel_drv.h  |    1 +
 drivers/gpu/drm/i915/intel_lvds.c |  156 +++++++++++++++++++++----------------
 3 files changed, 97 insertions(+), 69 deletions(-)

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