On Thu, Apr 17, 2025 at 04:10:35AM +0200, Aleksandrs Vinarskis wrote: > DisplayPort requires per-segment link training when LTTPR are switched > to non-transparent mode, starting with LTTPR closest to the source. > Only when each segment is trained individually, source can link train > to sink. > > Implement per-segment link traning when LTTPR(s) are detected, to > support external docking stations. On higher level, changes are: > > * Pass phy being trained down to all required helpers > * Run CR, EQ link training per phy > * Set voltage swing, pre-emphasis levels per phy > > This ensures successful link training both when connected directly to > the monitor (single LTTPR onboard most X1E laptops) and via the docking > station (at least two LTTPRs). > > Tested-by: Stefan Schmidt <stefan.schm...@linaro.org> > Signed-off-by: Aleksandrs Vinarskis <alex.vinars...@gmail.com> > Reviewed-by: Abel Vesa <abel.v...@linaro.org> > --- > drivers/gpu/drm/msm/dp/dp_ctrl.c | 126 ++++++++++++++++++++++--------- > 1 file changed, 89 insertions(+), 37 deletions(-) >
Reviewed-by: Dmitry Baryshkov <dmitry.barysh...@oss.qualcomm.com> -- With best wishes Dmitry
