Attention is currently required from: Nico Huber, Matt DeVillier, Michael Niewöhner.
Angel Pons uploaded patch set #8 to this change.
gfx gma skylake: Implement some workarounds
Without these workarounds, gfx_test will leave a WHL-U Librem Mini v1 in
a state where entering low-power states results in a hang. With these
workarounds, the system no longer locks up after running gfx_test. Looks
like the hang does not happen when coreboot runs libgfxinit.
Steps to reproduce the hang:
- Boot Linux without loading i915.
- Run gfx_test without the workarounds.
- After gfx_test exits and the machine enters a low-power state,
it will lock up.
If something keeps the CPU from getting into low-power states (e.g.
`cat /dev/zero > /dev/null`), the machine will not lock up. However,
stopping the load task after gfx_test has run will result in a lock-up.
Change-Id: I4cd64cf4c1e702dc05709adc345a976a4e3c1ded
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
---
M common/hw-gfx-gma-registers.ads
M common/skylake/hw-gfx-gma-power_and_clocks.adb
2 files changed, 14 insertions(+), 0 deletions(-)
git pull ssh://review.coreboot.org:29418/libgfxinit refs/changes/35/46635/8
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