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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 v4 5/7] drm/msm/dp: Support up to 3 DP controllers
Date: Tue, 5 Oct 2021 19:06:47 -0700	[thread overview]
Message-ID: <CAE-0n513cs282Dh_YFMHK2uKCVFSWxtNyfRaFwWGyUvpfShixw@mail.gmail.com> (raw)
In-Reply-To: <YVz/NOL3AFn2zBA0@ripper>

Quoting Bjorn Andersson (2021-10-05 18:43:16)
> On Tue 05 Oct 17:43 PDT 2021, Stephen Boyd wrote:
>
> > Quoting Bjorn Andersson (2021-10-05 16:13:21)
> > > diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
> > > index bdaf227f05dc..674cddfee5b0 100644
> > > --- a/drivers/gpu/drm/msm/dp/dp_display.c
> > > +++ b/drivers/gpu/drm/msm/dp/dp_display.c
> > > @@ -1233,7 +1239,7 @@ static int dp_display_probe(struct platform_device *pdev)
> > >         if (!dp)
> > >                 return -ENOMEM;
> > >
> > > -       desc = dp_display_get_desc(pdev);
> > > +       desc = dp_display_get_desc(pdev, &dp->id);
> >
> > I'm sad that dp->id has to match the number in the SoC specific
> > dpu_intf_cfg array in drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.c
> > still. Is there any way we can avoid that? Also, notice how those arrays
> > already have INTF_DP macros, which makes me think that it may be better
> > to connect this to those arrays instead of making an msm_dp_desc
> > structure and then make sure the 'type' member matches a connector
> > type number. Otherwise this code is super fragile.
> >
>
> I'm afraid I don't understand what you're proposing. Or which part you
> consider fragile, the indices of the INTF_DP instances aren't going to
> move around...
>
> I have N instances of the DP driver that I need to match to N entries
> from the platform specific intf array, I need some stable reference
> between them. When I started this journey I figured I could rely on the
> of_graph between the DPU and the interface controllers, but the values
> used there today are just bogus, so that was a no go.
>
> We can use whatever, as long as _dpu_kms_initialize_displayport() can
> come up with an identifier to put in h_tile_instance[0] so that
> dpu_encoder_setup_display() can find the relevant INTF.
>

To make it more concrete we can look at sc7180

static const struct dpu_intf_cfg sc7180_intf[] = {
        INTF_BLK("intf_0", INTF_0, 0x6A000, INTF_DP, 0, 24,
INTF_SC7180_MASK, MDP_SSPP_TOP0_INTR, 24, 25),
                                                     ^
                                                     |

intf0 is irrelevant. Also the address is irrelevant. But here we have a
zero, the number after INTF_DP, and that is very relevant. That number
needs to match the dp->id. Somewhere we have a match between
controller_id and dp->id in the code.

  reply	other threads:[~2021-10-06  2:06 UTC|newest]

Thread overview: 33+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-10-05 23:13 [PATCH v4 0/5] drm/msm/dp: Support multiple DP instances and add sc8180x Bjorn Andersson
2021-10-05 23:13 ` [PATCH v4 1/7] drm/msm/dp: Remove global g_dp_display variable Bjorn Andersson
2021-10-05 23:13 ` [PATCH v4 2/7] drm/msm/dp: Modify prototype of encoder based API Bjorn Andersson
2021-10-05 23:13 ` [PATCH v4 3/7] drm/msm/dp: Allow specifying connector_type per controller Bjorn Andersson
2021-10-06  0:15   ` Stephen Boyd
2021-10-06  0:29   ` Stephen Boyd
2021-10-06  3:35     ` Bjorn Andersson
2021-10-06  0:31   ` Stephen Boyd
2021-10-05 23:13 ` [PATCH v4 4/7] drm/msm/dp: Allow attaching a drm_panel Bjorn Andersson
2021-10-06  0:35   ` [Freedreno] " abhinavk
2021-10-06  2:09     ` Bjorn Andersson
2021-10-06  3:09       ` abhinavk
2021-10-08 15:01     ` Doug Anderson
2021-10-05 23:13 ` [PATCH v4 5/7] drm/msm/dp: Support up to 3 DP controllers Bjorn Andersson
2021-10-06  0:43   ` Stephen Boyd
2021-10-06  1:43     ` Bjorn Andersson
2021-10-06  2:06       ` Stephen Boyd [this message]
2021-10-06  2:37         ` Bjorn Andersson
2021-10-06  4:26           ` Stephen Boyd
2021-10-06  6:10             ` Dmitry Baryshkov
2021-10-06  7:06               ` Stephen Boyd
2021-10-06 11:35                 ` Dmitry Baryshkov
2021-10-06 17:07             ` Bjorn Andersson
2021-10-06 17:19               ` Stephen Boyd
2021-10-06 18:05                 ` Bjorn Andersson
2021-10-06 18:59                   ` Stephen Boyd
2021-10-06 20:39                     ` Bjorn Andersson
2021-10-07 22:29                       ` abhinavk
2021-10-06 17:19               ` Dmitry Baryshkov
2021-10-06 18:37                 ` Bjorn Andersson
2021-10-05 23:13 ` [PATCH v4 6/7] dt-bindings: msm/dp: Add SC8180x compatibles Bjorn Andersson
2021-10-05 23:13 ` [PATCH v4 7/7] drm/msm/dp: Add sc8180x DP controllers Bjorn Andersson
2021-10-06  0:36   ` Stephen Boyd

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