Hi,
This series aims at fixing a complete and silent hang when one tries to use CEC while the display output is off.
This can be tested with:
echo off > /sys/class/drm/card0-HDMI-A-1/status cec-ctl --tuner -p 1.0.0.0 cec-compliance
This series addresses it by making sure the HDMI controller is powered up as soon as the CEC device is opened by the userspace.
Let me know what you think, Maxime
Changes from v1: - More fixes - Added a big warning if we try to access a register while the device is disabled. - Fixed the pre_crtc_configure error path
Maxime Ripard (5): drm/vc4: hdmi: Make sure the controller is powered up during bind drm/vc4: hdmi: Rework the pre_crtc_configure error handling drm/vc4: hdmi: Split the CEC disable / enable functions in two drm/vc4: hdmi: Make sure the device is powered with CEC drm/vc4: hdmi: Warn if we access the controller while disabled
drivers/gpu/drm/vc4/vc4_hdmi.c | 123 +++++++++++++++++++--------- drivers/gpu/drm/vc4/vc4_hdmi_regs.h | 6 ++ 2 files changed, 89 insertions(+), 40 deletions(-)