On Mon, 2021-05-03 at 06:06 +0300, Ville Syrjälä wrote: > On Fri, Apr 30, 2021 at 06:34:28PM -0400, Lyude Paul wrote: > > Noticed this while fixing another issue in drm_dp_read_downstream_info(), > > the open coded DP_DOWNSTREAMPORT_PRESENT check here just duplicates what > > we > > already do in drm_dp_is_branch(), so just get rid of it. > > > > Signed-off-by: Lyude Paul <lyude@xxxxxxxxxx> > > --- > > drivers/gpu/drm/drm_dp_helper.c | 4 +--- > > 1 file changed, 1 insertion(+), 3 deletions(-) > > > > diff --git a/drivers/gpu/drm/drm_dp_helper.c > > b/drivers/gpu/drm/drm_dp_helper.c > > index 27c8c5bdf7d9..0f84df8798ab 100644 > > --- a/drivers/gpu/drm/drm_dp_helper.c > > +++ b/drivers/gpu/drm/drm_dp_helper.c > > @@ -677,9 +677,7 @@ int drm_dp_read_downstream_info(struct drm_dp_aux > > *aux, > > memset(downstream_ports, 0, DP_MAX_DOWNSTREAM_PORTS); > > > > /* No downstream info to read */ > > - if (!drm_dp_is_branch(dpcd) || > > - dpcd[DP_DPCD_REV] < DP_DPCD_REV_10 || > > - !(dpcd[DP_DOWNSTREAMPORT_PRESENT] & DP_DWN_STRM_PORT_PRESENT)) > > + if (!drm_dp_is_branch(dpcd) || dpcd[DP_DPCD_REV] < DP_DPCD_REV_10) > > BTW that DPCD_REV check looks rather wrong. > > Reviewed-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx> I'll send out a separate fix for this in just a moment, thanks for pointing it out! > > > return 0; > > > > /* Some branches advertise having 0 downstream ports, despite also > > advertising they have a > > -- > > 2.30.2 > > > > _______________________________________________ > > Intel-gfx mailing list > > Intel-gfx@xxxxxxxxxxxxxxxxxxxxx > > https://lists.freedesktop.org/mailman/listinfo/intel-gfx > -- Cheers, Lyude Paul (she/her) Software Engineer at Red Hat
