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From: Stephen Boyd <swboyd@chromium.org>
To: Bjorn Andersson <bjorn.andersson@linaro.org>
Cc: Abhinav Kumar <abhinavk@codeaurora.org>,
	Daniel Vetter <daniel@ffwll.ch>, David Airlie <airlied@linux.ie>,
	Dmitry Baryshkov <dmitry.baryshkov@linaro.org>,
	Kalyan Thota <kalyan_t@codeaurora.org>,
	Kuogee Hsieh <khsieh@codeaurora.org>,
	Rob Clark <robdclark@gmail.com>, Sean Paul <sean@poorly.run>,
	Rob Herring <robh+dt@kernel.org>,
	linux-arm-msm@vger.kernel.org, dri-devel@lists.freedesktop.org,
	freedreno@lists.freedesktop.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v3 3/5] drm/msm/dp: Support up to 3 DP controllers
Date: Mon, 4 Oct 2021 21:17:53 -0400	[thread overview]
Message-ID: <CAE-0n50UcL_ZcZ9isVC2ptnn0OiHHZnU0pTWe3fMd7jRS8z2Tw@mail.gmail.com> (raw)
In-Reply-To: <YVunKNXj+fxH/e1L@ripper>

Quoting Bjorn Andersson (2021-10-04 18:15:20)
> On Mon 04 Oct 17:58 PDT 2021, Stephen Boyd wrote:
>
> > Quoting Bjorn Andersson (2021-10-01 11:00:56)
> > > Based on the removal of the g_dp_display and the movement of the
> > > priv->dp lookup into the DP code it's now possible to have multiple
> > > DP instances.
> > >
> > > In line with the other controllers in the MSM driver, introduce a
> > > per-compatible list of base addresses which is used to resolve the
> > > "instance id" for the given DP controller. This instance id is used as
> > > index in the priv->dp[] array.
> > >
> > > Then extend the initialization code to initialize struct drm_encoder for
> > > each of the registered priv->dp[] and update the logic for associating
> > > each struct msm_dp with the struct dpu_encoder_virt.
> > >
> > > Lastly, bump the number of struct msm_dp instances carries by priv->dp
> > > to 3, the currently known maximum number of controllers found in a
> > > Qualcomm SoC.
> > >
> > > Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
> > > ---
> >
> > Reviewed-by: Stephen Boyd <swboyd@chromium.org>
> >
> > Some nits below.
> >
> > >
> > > Changes since v2:
> > > - Added MSM_DRM_DP_COUNT to link the two 3s
> > > - Moved NULL check for msm_dp_debugfs_init() to the call site
> > > - Made struct dp_display_private->id unsigned
> > >
> > > I also implemented added connector_type to each of the DP instances and
> > > propagated this to dp_drm_connector_init() but later dropped this again per
> > > Doug's suggestion that we'll base this on the presence/absence of a associated
> > > drm bridge or panel.
> >
> > Sad but OK. We can take up that topic in another patch.
> >
>
> So you don't agree with the solution from sn65dsi86?
>
> The only reason I haven't yet send this other patch is the of_graph
> thing Doug an I are discussing on the RFC. But if we agree to base this
> on compatible we could decide to look only for panels for the edp
> instances and avoid that problem...
>
> We would however never be able to describe the USB-less DP instance with
> a panel explicitly described in DT going that route.

I'll reply on that thread.

>
> > > diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
> > > index f655adbc2421..875b07e7183d 100644
> > > --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
> > > +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
> > > @@ -203,8 +204,10 @@ static int dpu_kms_debugfs_init(struct msm_kms *kms, struct drm_minor *minor)
> > >         dpu_debugfs_vbif_init(dpu_kms, entry);
> > >         dpu_debugfs_core_irq_init(dpu_kms, entry);
> > >
> > > -       if (priv->dp)
> > > -               msm_dp_debugfs_init(priv->dp, minor);
> > > +       for (i = 0; i < ARRAY_SIZE(priv->dp); i++) {
> > > +               if (priv->dp[i])
> > > +                       msm_dp_debugfs_init(priv->dp[i], minor);
> >
> > This seems to cause a bunch of debugfs warnings when there are multiple
> > nodes created with the same name.
> >
>
> Yes, that's true. I have a half-baked follow up that attempts to create
> instance-specific debugfs directories. Can we take that in a follow up?

Sure.

>
> > > +       }
> > >
> > >         return dpu_core_perf_debugfs_init(dpu_kms, entry);
> > >  }
> > > diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
> > > index 5d3ee5ef07c2..ff3477474c5d 100644
> > > --- a/drivers/gpu/drm/msm/dp/dp_display.c
> > > +++ b/drivers/gpu/drm/msm/dp/dp_display.c
> > > @@ -1180,10 +1192,31 @@ int dp_display_request_irq(struct msm_dp *dp_display)
> > >         return 0;
> > >  }
> > >
> > > +static int dp_display_find_id(struct platform_device *pdev)
> > > +{
> > > +       const struct msm_dp_config *cfg = of_device_get_match_data(&pdev->dev);
> > > +       struct resource *res;
> > > +       int i;
> > > +
> > > +
> >
> > Nitpick: Remove a newline here.
> >
> > > +       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> > > +       if (!res)
> > > +               return -EINVAL;
> > > +
> > > +       for (i = 0; i < cfg->num_descs; i++) {
> > > +               if (cfg->io_start[i] == res->start)
> > > +                       return i;
> > > +       }
> >
> > Nitpick: Drop braces on single line if inside for loop.
> >
>
> Not when the loop spans multiple lines?

Kernel style is to remove braces from single "statement" for loops where
in this case the statement is the if condition.

>
> > > +
> > > +       dev_err(&pdev->dev, "unknown displayport instance\n");
> > > +       return -EINVAL;
> > > +}
> > > +

  reply	other threads:[~2021-10-05  1:18 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-10-01 18:00 [PATCH v3 0/5] drm/msm/dp: Support multiple DP instances and add sc8180x Bjorn Andersson
2021-10-01 18:00 ` [PATCH v3 1/5] drm/msm/dp: Remove global g_dp_display variable Bjorn Andersson
2021-10-05 20:11   ` [Freedreno] " abhinavk
2021-10-01 18:00 ` [PATCH v3 2/5] drm/msm/dp: Modify prototype of encoder based API Bjorn Andersson
2021-10-05 20:13   ` [Freedreno] " abhinavk
2021-10-01 18:00 ` [PATCH v3 3/5] drm/msm/dp: Support up to 3 DP controllers Bjorn Andersson
2021-10-05  0:58   ` Stephen Boyd
2021-10-05  1:15     ` Bjorn Andersson
2021-10-05  1:17       ` Stephen Boyd [this message]
2021-10-05 20:16   ` [Freedreno] " abhinavk
2021-10-05 20:19     ` abhinavk
2021-10-01 18:00 ` [PATCH v3 4/5] dt-bindings: msm/dp: Add SC8180x compatibles Bjorn Andersson
2021-10-05 20:20   ` abhinavk
2021-10-01 18:00 ` [PATCH v3 5/5] drm/msm/dp: Add sc8180x DP controllers Bjorn Andersson
2021-10-05 20:20   ` [Freedreno] " abhinavk

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