linux-kernel - Re: [PATCH v2 06/11] drm/msm/disp/dpu1: Don't use DSC with mode

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Date:   Mon, 25 Oct 2021 21:40:45 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc:     Rob Clark <robdclark@...il.com>, linux-arm-msm@...r.kernel.org,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Jonathan Marek <jonathan@...ek.ca>,
        Abhinav Kumar <abhinavk@...eaurora.org>,
        Jeffrey Hugo <jeffrey.l.hugo@...il.com>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org
Subject: Re: [PATCH v2 06/11] drm/msm/disp/dpu1: Don't use DSC with mode_3d

On 25-10-21, 17:40, Dmitry Baryshkov wrote:
> On 20/10/2021 09:57, Vinod Koul wrote:
> > On 14-10-21, 16:50, Dmitry Baryshkov wrote:
> > > On 14/10/2021 16:41, Dmitry Baryshkov wrote:
> > > > On 07/10/2021 10:08, Vinod Koul wrote:

> > > > > diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.h
> > > > > b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.h
> > > > > index 806c171e5df2..5dfac5994bd4 100644
> > > > > --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.h
> > > > > +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.h
> > > > > @@ -39,6 +39,7 @@ struct dpu_hw_stage_cfg {
> > > > >     * @mode_3d:               3d mux configuration
> > > > >     * @merge_3d:              3d merge block used
> > > > >     * @intf_mode_sel:         Interface mode, cmd / vid
> > > > > + * @dsc:                   DSC BIT masks
> > > > >     * @stream_sel:            Stream selection for multi-stream interfaces
> > > > >     */
> > > > >    struct dpu_hw_intf_cfg {
> > > > > @@ -46,6 +47,7 @@ struct dpu_hw_intf_cfg {
> > > > >        enum dpu_3d_blend_mode mode_3d;
> > > > >        enum dpu_merge_3d merge_3d;
> > > > >        enum dpu_ctl_mode_sel intf_mode_sel;
> > > > > +    unsigned int dsc;
> > > 
> > > I think this should be:
> > > enum dpu_dsc dsc[MAX_DSCS];
> > > unsigned int num_dsc;
> > 
> > hmmm, how do we go about getting the num_dsc value here.
> > dpu_encoder_phys does not know about that..
> 
> dpu_encoder_get_topology() can decide whether to use DSC or not and then set
> num_dsc. For now it will always set 2 if we are using DSC at all, but let's
> keep the decision in a single place rather than having it scattered all over
> the driver.

Yes agree, but dpu_encoder_get_topology() is private to encoder. Am not
sure how best to propagate the info into the hw_intf_cfg?
-- 
~Vinod