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drivers/intel/gma: Add override for presence straps

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A handful of boards do not properly implement the presence straps,
leading libgfxinit to fail to detect an attached display. Add an
override, defaulting to N, which can be set for affected boards.

Add a section to the documentation detailing the option and its usage.

Signed-off-by: Matt DeVillier <matt.devillier@puri.sm>
Change-Id: I43c61d67147878887658b23d90fb1c0b91e7a2af
Reviewed-on: https://review.coreboot.org/c/coreboot/+/41416
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>
This commit is contained in:
Matt DeVillier
2020-05-14 17:45:29 -05:00
committed by Nico Huber
parent bba5bfc7d2
commit dd467bfc14
2 changed files with 29 additions and 5 deletions
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7
src/drivers/intel/gma/Kconfig
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@@ -127,4 +127,11 @@ config GFX_GMA_ANALOG_I2C_PORT
digital displays. In that case, the EDID for a VGA display has to be
read over the I2C interface of the coupled digital port.
config GFX_GMA_IGNORE_PRESENCE_STRAPS
def_bool n
help
libgfxinit uses the GPU presence straps to determine if a display port
is present/enabled. Select this option if a board doesn't correctly implement
these straps, causing libgfxinit to fail to detect an attached panel.
endif