Attention is currently required from: Nico Huber, Martin Roth. Hello Nico Huber, Patrick Georgi, Martin Roth,
I'd like you to reexamine a change. Please visit
https://review.coreboot.org/c/libgfxinit/+/51133
to look at the new patch set (#9).
Change subject: Add support to switch LSPCON modes ......................................................................
Add support to switch LSPCON modes
LSPCON is a highly-cursed level shifter and protocol converter chip. It is primarily used to convert DisplayPort into HDMI 2.0, since some Intel iGPUs do not have native HDMI 2.0 support. The chip defaults to LS mode.
Add code to detect LSPCON chips and put them in protocol converter mode. This way, the LSPCON behaves like a regular DisplayPort sink. This needs to be done before any DPCD accesses, because the LSPCON does not respond to DPCD accesses in level shifter mode.
Tested on Purism Librem Mini v1 (WHL-U), HDMI port can now light up.
Change-Id: Idfa9bdff47a6591000cd5092d64a4cd4f8dbdc8d Signed-off-by: Angel Pons th3fanbus@gmail.com --- M common/Makefile.inc A common/hw-gfx-dp_dual_mode.adb A common/hw-gfx-dp_dual_mode.ads M common/hw-gfx-gma-connector_info.adb A common/hw-gfx-gma-dp_dual_mode.ads 5 files changed, 262 insertions(+), 0 deletions(-)
git pull ssh://review.coreboot.org:29418/libgfxinit refs/changes/33/51133/9