linux-kernel - Re: [PATCH 11/11] drm/msm/dpu: do not use mixer that supports dspp when not required

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Date:   Thu, 20 Apr 2023 09:08:42 +0200
From:   Arnaud Vrac <avrac@...ebox.fr>
To:     Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc:     Rob Clark <robdclark@...il.com>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        Sean Paul <sean@...rly.run>, David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>, linux-arm-msm@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 11/11] drm/msm/dpu: do not use mixer that supports dspp
 when not required

Le jeu. 20 avr. 2023 à 01:18, Dmitry Baryshkov
<dmitry.baryshkov@...aro.org> a écrit :
>
> On 19/04/2023 17:41, Arnaud Vrac wrote:
> > This avoids using lm blocks that support DSPP when not needed, to
> > keep those resources available.
>
> This will break some of the platforms. Consider qcm2290 which has a
> single LM with DSPP. So, _dpu_rm_check_lm_and_get_connected_blks should
> be performed in two steps: first skip non-DSPP-enabled LMs when DSPP is
> not required. Then, if the LM (pair) is not found, look for any suitable
> LM(pair).

Good point, I'll add the change.

>
> >
> > Signed-off-by: Arnaud Vrac <avrac@...ebox.fr>
> > ---
> >   drivers/gpu/drm/msm/disp/dpu1/dpu_rm.c | 2 +-
> >   1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_rm.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_rm.c
> > index f4dda88a73f7d..4b393d46c743f 100644
> > --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_rm.c
> > +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_rm.c
> > @@ -362,7 +362,7 @@ static bool _dpu_rm_check_lm_and_get_connected_blks(struct dpu_rm *rm,
> >       *pp_idx = idx;
> >
> >       if (!reqs->topology.num_dspp)
> > -             return true;
> > +             return !lm_cfg->dspp;
> >
> >       idx = lm_cfg->dspp - DSPP_0;
> >       if (idx < 0 || idx >= ARRAY_SIZE(rm->dspp_blks)) {
> >
>
> --
> With best wishes
> Dmitry
>