| Message ID | 1650932213-19162-3-git-send-email-quic_khsieh@quicinc.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | fix DP phy compliance test | expand |
Quoting Kuogee Hsieh (2022-04-25 17:16:53) > At normal operation, transmit phy test pattern has to be terminated before > DP controller switch to video ready state. However during phy compliance > testing, transmit phy test pattern should not be terminated until end of > compliance test which usually indicated by unplugged interrupt. > > Only stop sending the train pattern in dp_ctrl_on_stream() if we're not > doing compliance testing. We also no longer reset 'p_level' and > 'v_level' within dp_ctrl_on_link() due to both 'p_level' and 'v_level' > are acquired from link status at previous dpcd read and we like to use > those level to start link training. > > Changes in v2: > -- add more details commit text > -- correct Fixes > > Fixes: 2e0adc765d88 ("drm/msm/dp: do not end dp link training until video is ready") > Signed-off-by: Kuogee Hsieh <quic_khsieh@quicinc.com> > --- Reviewed-by: Stephen Boyd <swboyd@chromium.org> One comment. > diff --git a/drivers/gpu/drm/msm/dp/dp_ctrl.c b/drivers/gpu/drm/msm/dp/dp_ctrl.c > index 193cc1a..f99e173 100644 > --- a/drivers/gpu/drm/msm/dp/dp_ctrl.c > +++ b/drivers/gpu/drm/msm/dp/dp_ctrl.c > @@ -1839,6 +1831,13 @@ int dp_ctrl_on_stream(struct dp_ctrl *dp_ctrl) > return 0; > } > > + if (!dp_ctrl_channel_eq_ok(ctrl)) { > + dp_ctrl_link_retrain(ctrl); > + } Drop unnecessary braces.
diff --git a/drivers/gpu/drm/msm/dp/dp_ctrl.c b/drivers/gpu/drm/msm/dp/dp_ctrl.c index 193cc1a..f99e173 100644 --- a/drivers/gpu/drm/msm/dp/dp_ctrl.c +++ b/drivers/gpu/drm/msm/dp/dp_ctrl.c @@ -1699,8 +1699,6 @@ int dp_ctrl_on_link(struct dp_ctrl *dp_ctrl) ctrl->link->link_params.rate, ctrl->link->link_params.num_lanes, ctrl->dp_ctrl.pixel_rate); - ctrl->link->phy_params.p_level = 0; - ctrl->link->phy_params.v_level = 0; rc = dp_ctrl_enable_mainlink_clocks(ctrl); if (rc) @@ -1822,12 +1820,6 @@ int dp_ctrl_on_stream(struct dp_ctrl *dp_ctrl) } } - if (!dp_ctrl_channel_eq_ok(ctrl)) - dp_ctrl_link_retrain(ctrl); - - /* stop txing train pattern to end link training */ - dp_ctrl_clear_training_pattern(ctrl); - ret = dp_ctrl_enable_stream_clocks(ctrl); if (ret) { DRM_ERROR("Failed to start pixel clocks. ret=%d\n", ret); @@ -1839,6 +1831,13 @@ int dp_ctrl_on_stream(struct dp_ctrl *dp_ctrl) return 0; } + if (!dp_ctrl_channel_eq_ok(ctrl)) { + dp_ctrl_link_retrain(ctrl); + } + + /* stop txing train pattern to end link training */ + dp_ctrl_clear_training_pattern(ctrl); + /* * Set up transfer unit values and set controller state to send * video.
At normal operation, transmit phy test pattern has to be terminated before DP controller switch to video ready state. However during phy compliance testing, transmit phy test pattern should not be terminated until end of compliance test which usually indicated by unplugged interrupt. Only stop sending the train pattern in dp_ctrl_on_stream() if we're not doing compliance testing. We also no longer reset 'p_level' and 'v_level' within dp_ctrl_on_link() due to both 'p_level' and 'v_level' are acquired from link status at previous dpcd read and we like to use those level to start link training. Changes in v2: -- add more details commit text -- correct Fixes Fixes: 2e0adc765d88 ("drm/msm/dp: do not end dp link training until video is ready") Signed-off-by: Kuogee Hsieh <quic_khsieh@quicinc.com> --- drivers/gpu/drm/msm/dp/dp_ctrl.c | 15 +++++++-------- 1 file changed, 7 insertions(+), 8 deletions(-)