tree d1440b51ab228b826b92326f8aecad506b9460fd
parent 0dadb674cc98974378ccceccc8c557197a2bad16
author Tim Wawrzynczak <twawrzynczak@chromium.org> 1654714099 -0600
committer Nico Huber <nico.h@gmx.de> 1685388150 +0000

gma: Begin Tiger Lake (TGL) integration

Tiger Lake's integrated graphics engine is built off an entirely new
igfx architecture named "Iris Xe". This patch adds just enough support
to compile for Tiger Lake. Fortunately, the backlight programming
hasn't changed since SKL, so with a little bit of hacking, one can
also have libgfxinit turn on the backlight to verify something is
working and running.

The first pass through the support will focus mostly on the eDP panel,
then Type-C ports (both in fixed/native mode [DP/HDMI] and in Type-C
DP Alt Mode). TBT will not be mostly ignored in this first pass, as
it is not as widely used (yet?) as the other protocols.

This patch includes changes to fix ironlake gnatprove errors caused by
the new PCH_HDMI_A port definition.

Tested on google/voxel, with DEBUG_ADA_CODE enabled.
Tested on google/skolas, with DEBUG_ADA_CODE enabled.

This patch leaves the following unresolved gnatprove errors:
- hw-gfx-gma-port_detect.ads:17:14:
     warning: subprogram "Initialize" has no effect
- hw-gfx-gma-port_detect.ads:20:07:
     warning: unused variable "Port"
- hw-gfx-gma-port_detect.ads:23:14:
     warning: subprogram "Clear_Hotplug_Detect" has no effect
- hw-gfx-gma-connectors.ads:39:14:
     warning: subprogram "Post_Off" has no effect
- hw-gfx-gma-connectors.ads:42:14:
     warning: subprogram "Post_All_Off" has no effect

These errors will by addressed by the proper implementation of these
procedures.

Change-Id: I84f15837856ecc5ec8df18b39d3989885cd550d4
Signed-off-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Signed-off-by: Jeremy Compostella <jeremy.compostella@intel.com>
Reviewed-on: https://review.coreboot.org/c/libgfxinit/+/70887
Tested-by: Nico Huber <nico.h@gmx.de>
Reviewed-by: Sean Rhodes <sean@starlabs.systems>
Reviewed-by: Nico Huber <nico.h@gmx.de>