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authorTristan Corrick <tristan@corrick.kiwi>2018-10-31 02:27:29 +1300
committerNico Huber <nico.h@gmx.de>2018-11-01 22:23:52 +0000
commit1a73eb08e79b4a53702ff9e9103bb3352391892b (patch)
treedb1a824ac9abb5ee78f96bda5dabc7dd2d3dc2f1 /src/drivers
parentfdf907e4405e5df84e9d5a29735e0506782d9c6d (diff)
nb/intel/haswell/gma: Support boards that have DDI E connected
On an ASRock H81M-HDS neither libgfxinit, nor Linux, is able to initialise the display when lanes are not configured to be shared between DDI A and DDI E. Intel's reference manual [1] states that the decision to share lanes between DDI A and DDI E is "based on board configuration". Hence, add a new field to the devicetree that boards can set. All existing Haswell boards have this unset, thus taking a value of 0, so there is no change to existing behaviour. [1]: Intel Open Source Graphics Programmer's Reference Manual (PRM) Volume 2c: Command Reference: Registers (Haswell) https://01.org/linuxgraphics/documentation/hardware-specification-prms/2013-intel-core-processor-family Change-Id: I6f7832293215d2b53e31b0a5c985e6098eb72f1b Signed-off-by: Tristan Corrick <tristan@corrick.kiwi> Reviewed-on: https://review.coreboot.org/29385 Reviewed-by: Nico Huber <nico.h@gmx.de> Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
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