linux-kernel - Re: [PATCH v1 1/3] drm/msm/dpu: set dirty

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Date:   Fri, 31 Mar 2023 17:45:17 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Vinod Polimera <quic_vpolimer@...cinc.com>
Cc:     dri-devel@...ts.freedesktop.org, linux-arm-msm@...r.kernel.org,
        freedreno@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, robdclark@...il.com,
        dianders@...omium.org, swboyd@...omium.org,
        quic_kalyant@...cinc.com, quic_khsieh@...cinc.com,
        quic_vproddut@...cinc.com, quic_bjorande@...cinc.com,
        quic_abhinavk@...cinc.com, quic_sbillaka@...cinc.com
Subject: Re: [PATCH v1 1/3] drm/msm/dpu: set dirty_fb flag while in self
 refresh mode

On Fri, 31 Mar 2023 at 16:59, Vinod Polimera <quic_vpolimer@...cinc.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@...nel.org>
> Link: https://lore.kernel.org/all/20230326162723.3lo6pnsfdwzsvbhj@ripper/
> Signed-off-by: Vinod Polimera <quic_vpolimer@...cinc.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