linux-kernel - Re: [PATCH 3/3] drm/msm/dpu: add support for clk and bw scaling for display

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Date:   Sun, 8 Nov 2020 23:25:15 +0530
From:   Amit Pundir <amit.pundir@...aro.org>
To:     Rob Clark <robdclark@...il.com>
Cc:     Kalyan Thota <kalyan_t@...eaurora.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        freedreno <freedreno@...ts.freedesktop.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Sean Paul <seanpaul@...omium.org>,
        "Kristian H. Kristensen" <hoegsberg@...omium.org>,
        Douglas Anderson <dianders@...omium.org>,
        Krishna Manikandan <mkrishn@...eaurora.org>,
        Jeykumar Sankaran <jsanka@...eaurora.org>,
        Raviteja Tamatam <travitej@...eaurora.org>,
        nganji@...eaurora.org, Georgi Djakov <georgi.djakov@...aro.org>,
        John Stultz <john.stultz@...aro.org>,
        Sumit Semwal <sumit.semwal@...aro.org>
Subject: Re: [PATCH 3/3] drm/msm/dpu: add support for clk and bw scaling for display

On Tue, 4 Aug 2020 at 21:09, Rob Clark <robdclark@...il.com> wrote:
>
> On Thu, Jul 16, 2020 at 4:36 AM Kalyan Thota <kalyan_t@...eaurora.org> wrote:
> >
> > This change adds support to scale src clk and bandwidth as
> > per composition requirements.
> >
> > Interconnect registration for bw has been moved to mdp
> > device node from mdss to facilitate the scaling.
> >
> > Changes in v1:
> >  - Address armv7 compilation issues with the patch (Rob)
> >
> > Signed-off-by: Kalyan Thota <kalyan_t@...eaurora.org>
>
> Reviewed-by: Rob Clark <robdclark@...omium.org>
>

Hi Kalyan, Rob,

This patch broke the display on the PocoF1 phone
(sdm845-xiaomi-beryllium.dts) running AOSP.
I can boot to UI but the display is frozen soon after that and
dmesg is full of following errors:

[drm:dpu_core_perf_crtc_update:397] [dpu error]crtc-65: failed to
update bus bw vote
[drm:dpu_core_perf_crtc_check:203] [dpu error]exceeds bandwidth:
7649746kb > 6800000kb
[drm:dpu_crtc_atomic_check:969] [dpu error]crtc65 failed performance check -7
[drm:dpu_core_perf_crtc_check:203] [dpu error]exceeds bandwidth:
7649746kb > 6800000kb
[drm:dpu_crtc_atomic_check:969] [dpu error]crtc65 failed performance check -7
[drm:dpu_core_perf_crtc_check:203] [dpu error]exceeds bandwidth:
7649746kb > 6800000kb
[drm:dpu_crtc_atomic_check:969] [dpu error]crtc65 failed performance check -7

Here is the full dmesg https://pastebin.ubuntu.com/p/PcSdNgMnYw/.
Georgi pointed out following patch but it didn't help,
https://lore.kernel.org/dri-devel/20201027102304.945424-1-dmitry.baryshkov@linaro.org/
Am I missing any other followup fix?

Regards,
Amit Pundir