[Freedreno] [PATCH 3/3] drm/msm/dpu: add support for clk and bw scaling for display

[Amit Pundir]

On Tue, 4 Aug 2020 at 21:09, Rob Clark <robdclark at gmail.com> wrote:
>
> On Thu, Jul 16, 2020 at 4:36 AM Kalyan Thota <kalyan_t at codeaurora.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 at codeaurora.org>
>
> Reviewed-by: Rob Clark <robdclark at chromium.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