linux-kernel - Re: [Freedreno] [REPOST PATCH v4 10/13] drm/msm/disp/dpu1: Add support for DSC in topology

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Message-ID: <YjsGxLt3ixy1nHxf@matsya>
Date:   Wed, 23 Mar 2022 17:08:44 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Marijn Suijten <marijn.suijten@...ainline.org>
Cc:     Jonathan Marek <jonathan@...ek.ca>,
        David Airlie <airlied@...ux.ie>, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Abhinav Kumar <abhinavk@...eaurora.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Rob Clark <robdclark@...il.com>,
        dri-devel@...ts.freedesktop.org, Daniel Vetter <daniel@...ll.ch>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        freedreno@...ts.freedesktop.org
Subject: Re: [Freedreno] [REPOST PATCH v4 10/13] drm/msm/disp/dpu1: Add
 support for DSC in topology

On 17-02-22, 22:44, Marijn Suijten wrote:
> On 2022-02-10 16:04:20, Vinod Koul wrote:
> > For DSC to work we typically need a 2,2,1 configuration. This should
> > suffice for resolutions up to 4k. For more resolutions like 8k this won't
> > work.
> > 
> > Also, it is better to use 2 LMs and DSC instances as half width results
> > in lesser power consumption as compared to single LM, DSC at full width.
> > 
> > The panel has been tested only with 2,2,1 configuration, so for
> > now we blindly create 2,2,1 topology when DSC is enabled
> > 
> > Co-developed-by: Abhinav Kumar <abhinavk@...eaurora.org>
> > Signed-off-by: Abhinav Kumar <abhinavk@...eaurora.org>
> > Signed-off-by: Vinod Koul <vkoul@...nel.org>
> > ---
> >  drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c | 13 +++++++++++++
> >  drivers/gpu/drm/msm/msm_drv.h               |  2 ++
> >  2 files changed, 15 insertions(+)
> > 
> > diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> > index 95a7bf362e81..13ccb7b3cce5 100644
> > --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> > +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> > @@ -574,8 +574,21 @@ static struct msm_display_topology dpu_encoder_get_topology(
> >  	topology.num_enc = 0;
> >  	topology.num_intf = intf_count;
> >  
> > +	if (dpu_enc->dsc) {
> > +		/* In case of Display Stream Compression DSC, we would use
> > +		 * 2 encoders, 2 line mixers and 1 interface
> 
> LM is a layer mixer, not a line mixer, right?

Right, thanks for spotting

-- 
~Vinod