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From:   Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Date:   Fri, 31 Mar 2023 17:45:17 +0300
Message-ID: <CAA8EJpo4HaYJ358gnBTfo94o7xUcN+z57+EJUMfJT1gQ5m_UEg@mail.gmail.com>
Subject: Re: [PATCH v1 1/3] drm/msm/dpu: set dirty_fb flag while in self
 refresh mode
To:     Vinod Polimera <quic_vpolimer@quicinc.com>
Cc:     dri-devel@lists.freedesktop.org, linux-arm-msm@vger.kernel.org,
        freedreno@lists.freedesktop.org, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org, robdclark@gmail.com,
        dianders@chromium.org, swboyd@chromium.org,
        quic_kalyant@quicinc.com, quic_khsieh@quicinc.com,
        quic_vproddut@quicinc.com, quic_bjorande@quicinc.com,
        quic_abhinavk@quicinc.com, quic_sbillaka@quicinc.com
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On Fri, 31 Mar 2023 at 16:59, Vinod Polimera <quic_vpolimer@quicinc.com> wrote:
>
> While in virtual terminal mode with PSR enabled, there will be
> no atomic commits triggered without dirty_fb being set. This
> will create a notion of no screen update. Allow atomic commit
> when dirty_fb ioctl is issued, so that it can trigger a PSR exit
> and shows update on the screen.

Will this impact non-VT workloads? If I remember correctly, we added
dirty_fb handling to prevent the framework from limiting the page
flips to vblank events (in DSI video mode).

>
> Reported-by: Bjorn Andersson <andersson@kernel.org>
> Link: https://lore.kernel.org/all/20230326162723.3lo6pnsfdwzsvbhj@ripper/
> Signed-off-by: Vinod Polimera <quic_vpolimer@quicinc.com>
> ---
>  drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> index ab636da..96f645e 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> @@ -1158,6 +1158,9 @@ static bool dpu_crtc_needs_dirtyfb(struct drm_crtc_state *cstate)
>         struct drm_crtc *crtc = cstate->crtc;
>         struct drm_encoder *encoder;
>
> +       if (cstate->self_refresh_active)
> +               return true;
> +
>         drm_for_each_encoder_mask (encoder, crtc->dev, cstate->encoder_mask) {
>                 if (dpu_encoder_get_intf_mode(encoder) == INTF_MODE_CMD) {
>                         return true;
> --
> 2.7.4
>


-- 
With best wishes
Dmitry