linux-kernel - Re: [PATCH v7 1/5] drm/msm/disp/dpu1: set mdp clk to the maximum frequency in opp table during probe

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Date:   Fri, 22 Apr 2022 08:16:51 -0700
From:   Doug Anderson <dianders@...omium.org>
To:     Vinod Polimera <quic_vpolimer@...cinc.com>,
        Rob Clark <robdclark@...il.com>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc:     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>, LKML <linux-kernel@...r.kernel.org>,
        quic_kalyant <quic_kalyant@...cinc.com>
Subject: Re: [PATCH v7 1/5] drm/msm/disp/dpu1: set mdp clk to the maximum
 frequency in opp table during probe

Hi,

On Mon, Mar 21, 2022 at 8:27 PM Vinod Polimera
<quic_vpolimer@...cinc.com> wrote:
>
> Set mdp clock to max clock rate during probe/bind sequence from the
> opp table so that rails are not at undetermined state. Since we do not
> know what will be the rate set in boot loader, it would be ideal to
> vote at max frequency. There could be a firmware display programmed
> in bootloader and we want to transition it to kernel without underflowing.
> The clock will be scaled down later when framework sends an update.
>
> Fixes: 25fdd5933e4c ("drm/msm: Add SDM845 DPU support")
> Signed-off-by: Vinod Polimera <quic_vpolimer@...cinc.com>
> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> Reviewed-by: Douglas Anderson <dianders@...omium.org>
> ---
>  drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c | 8 ++++++++
>  1 file changed, 8 insertions(+)

Just wanted to confirm that this patch will be queued up somewhat
soon. I think it's good to go but I don't see it in any trees yet. ;-)

FWIW, I can also say that I've tested this patch and it fixes the
underrun issues on sc7280-herobrine-rev1.

Tested-by: Douglas Anderson <dianders@...omium.org>

-Doug