On Tue, 3 Sept 2024 at 10:48, Jun Nie <jun.nie@xxxxxxxxxx> wrote: > > Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx> 于2024年8月29日周四 19:10写道： > > > > On Thu, 29 Aug 2024 at 13:20, Jun Nie <jun.nie@xxxxxxxxxx> wrote: > > > > > > Do not assume DSC number as 2. Because there are 4 DSC in > > > quad pipe case. > > > > Please expand the commit message. You prefer brevity, but your > > comments lack clarifications. > > Is below message OK? > > Current DSC number is fixed to 2 for any DSC usage case. While there are > more usage case that involve different number of DSC engine, such 4 in > quad-pipe case with bonded-DSI scenario. So retrieve the real number with > this change. Please rewrite the last sentence. See Documentation/process/submitting-patches.rst "Describe your changes". > > > > > > > > > Signed-off-by: Jun Nie <jun.nie@xxxxxxxxxx> > > > --- > > > drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c | 4 ++-- > > > 1 file changed, 2 insertions(+), 2 deletions(-) > > > > > > diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c > > > index 6bdd9c21ff3ed..05b203be2a9bc 100644 > > > --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c > > > +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c > > > @@ -553,9 +553,9 @@ bool dpu_encoder_use_dsc_merge(struct drm_encoder *drm_enc) > > > if (dpu_enc->phys_encs[i]) > > > intf_count++; > > > > > > - /* See dpu_encoder_get_topology, we only support 2:2:1 topology */ > > > + /* DSC and mixer are mapped 1:1, so reuse the mixer number */ > > > > Why? DSCmerge is a valid topology even if it is not supported yet. > > DSC merge is already supported in 2:2:1 topology without this patch > set. This change > is to get real DSC number in 4:4:2 topology, so that DSC merge can be > enabled for the > case. Yep, 3DMerge, not DSC Merge. Basically the comment about 1:1 is incorrect. See sde_rm.h Also it's "number of mixers", not "mixer number" (two different things). > > > > > > if (dpu_enc->dsc) > > > - num_dsc = 2; > > > + num_dsc = dpu_crtc_get_lm_num(drm_enc->crtc->state); > > > > > > return (num_dsc > 0) && (num_dsc > intf_count); > > > } > > > > > > -- > > > 2.34.1 > > > > > > > > > -- > > With best wishes > > Dmitry -- With best wishes Dmitry
