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[AMD Official Use Only - Internal Distribution Only]
Reviewed-by: Joseph Gravenor <Joseph.Gravenor@xxxxxxx>
From: Liu, Zhan <Zhan.Liu@xxxxxxx>
Sent: Friday, April 17, 2020 1:17 PM To: Liu, Zhan <Zhan.Liu@xxxxxxx>; amd-gfx@xxxxxxxxxxxxxxxxxxxxx <amd-gfx@xxxxxxxxxxxxxxxxxxxxx>; Gravenor, Joseph <Joseph.Gravenor@xxxxxxx> Subject: RE: [PATCH] drm/amd/display: Remove aconnector condition check for dpcd read + Joseph
Hi Joseph, Would you like to help me review this change? This was a follow-up on the discussion we had earlier this year. Thanks, Zhan > -----Original Message----- > From: Liu, Zhan <zhan.liu@xxxxxxx> > Sent: 2020/April/16, Thursday 3:24 PM > To: amd-gfx@xxxxxxxxxxxxxxxxxxxxx; Liu, Zhan <Zhan.Liu@xxxxxxx> > Subject: [PATCH] drm/amd/display: Remove aconnector condition check for > dpcd read > > [Why] > Aconnector is not necessary to be NULL in order to read dpcd successfully. > > Actually if we rely on checking aconnector here, we won't be able to turn off > all displays before doing display detection. That will cause some MST hubs > not able to light up. > > [How] > Remove aconnector check when turning off all displays at hardware > initialization stage. > > Signed-off-by: Zhan Liu <zhan.liu@xxxxxxx> > --- > .../amd/display/dc/dcn10/dcn10_hw_sequencer.c | 36 ++++++++----------- > 1 file changed, 14 insertions(+), 22 deletions(-) > > diff --git a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c > b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c > index 9f41efddc9bc..6f33f3f0d023 100644 > --- a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c > +++ b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c > @@ -1332,31 +1332,23 @@ void dcn10_init_hw(struct dc *dc) > if (dc->links[i]->connector_signal != > SIGNAL_TYPE_DISPLAY_PORT) > continue; > > - /* > - * core_link_read_dpcd() will invoke > dm_helpers_dp_read_dpcd(), > - * which needs to read dpcd info with the help of > aconnector. > - * If aconnector (dc->links[i]->prev) is NULL, then > dpcd status > - * cannot be read. > - */ > - if (dc->links[i]->priv) { > - /* if any of the displays are lit up turn them > off */ > - status = core_link_read_dpcd(dc->links[i], > DP_SET_POWER, > - > &dpcd_power_state, sizeof(dpcd_power_state)); > - if (status == DC_OK && dpcd_power_state == > DP_POWER_STATE_D0) { > - /* blank dp stream before power off > receiver*/ > - if (dc->links[i]->link_enc->funcs- > >get_dig_frontend) { > - unsigned int fe = dc->links[i]- > >link_enc->funcs->get_dig_frontend(dc->links[i]->link_enc); > - > - for (j = 0; j < dc->res_pool- > >stream_enc_count; j++) { > - if (fe == dc- > >res_pool->stream_enc[j]->id) { > - dc- > >res_pool->stream_enc[j]->funcs->dp_blank( > - > dc->res_pool->stream_enc[j]); > - break; > - } > + /* if any of the displays are lit up turn them off */ > + status = core_link_read_dpcd(dc->links[i], > DP_SET_POWER, > + &dpcd_power_state, > sizeof(dpcd_power_state)); > + if (status == DC_OK && dpcd_power_state == > DP_POWER_STATE_D0) { > + /* blank dp stream before power off > receiver*/ > + if (dc->links[i]->link_enc->funcs- > >get_dig_frontend) { > + unsigned int fe = > +dc->links[i]->link_enc->funcs->get_dig_frontend(dc->links[i]->link_enc) > +; > + > + for (j = 0; j < dc->res_pool- > >stream_enc_count; j++) { > + if (fe == dc->res_pool- > >stream_enc[j]->id) { > + dc->res_pool- > >stream_enc[j]->funcs->dp_blank( > + > dc->res_pool->stream_enc[j]); > + break; > } > } > - dp_receiver_power_ctrl(dc->links[i], > false); > } > + dp_receiver_power_ctrl(dc->links[i], false); > } > } > } > -- > 2.17.1 |
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