linux-kernel - RE: [PATCH v14 13/14] drm/msm/disp/dpu: update dpu_enc crtc state on crtc enable/disable during self refresh

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Date:   Tue, 14 Mar 2023 10:32:14 +0000
From:   Vinod Polimera <vpolimer@....qualcomm.com>
To:     "Vinod Polimera (QUIC)" <quic_vpolimer@...cinc.com>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>,
        "freedreno@...ts.freedesktop.org" <freedreno@...ts.freedesktop.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "robdclark@...il.com" <robdclark@...il.com>,
        "dianders@...omium.org" <dianders@...omium.org>,
        "swboyd@...omium.org" <swboyd@...omium.org>,
        "Kalyan Thota (QUIC)" <quic_kalyant@...cinc.com>,
        "dmitry.baryshkov@...aro.org" <dmitry.baryshkov@...aro.org>,
        "Kuogee Hsieh (QUIC)" <quic_khsieh@...cinc.com>,
        "Vishnuvardhan Prodduturi (QUIC)" <quic_vproddut@...cinc.com>,
        "Bjorn Andersson (QUIC)" <quic_bjorande@...cinc.com>,
        "Abhinav Kumar (QUIC)" <quic_abhinavk@...cinc.com>,
        "Sankeerth Billakanti (QUIC)" <quic_sbillaka@...cinc.com>
Subject: RE: [PATCH v14 13/14] drm/msm/disp/dpu: update dpu_enc crtc state on
 crtc enable/disable during self refresh



> -----Original Message-----
> From: Vinod Polimera (QUIC) <quic_vpolimer@...cinc.com>
> Sent: Thursday, March 2, 2023 10:03 PM
> To: dri-devel@...ts.freedesktop.org; linux-arm-msm@...r.kernel.org;
> freedreno@...ts.freedesktop.org; devicetree@...r.kernel.org
> Cc: Vinod Polimera (QUIC) <quic_vpolimer@...cinc.com>; linux-
> kernel@...r.kernel.org; robdclark@...il.com; dianders@...omium.org;
> swboyd@...omium.org; Kalyan Thota (QUIC) <quic_kalyant@...cinc.com>;
> dmitry.baryshkov@...aro.org; Kuogee Hsieh (QUIC)
> <quic_khsieh@...cinc.com>; Vishnuvardhan Prodduturi (QUIC)
> <quic_vproddut@...cinc.com>; Bjorn Andersson (QUIC)
> <quic_bjorande@...cinc.com>; Abhinav Kumar (QUIC)
> <quic_abhinavk@...cinc.com>; Sankeerth Billakanti (QUIC)
> <quic_sbillaka@...cinc.com>
> Subject: [PATCH v14 13/14] drm/msm/disp/dpu: update dpu_enc crtc state
> on crtc enable/disable during self refresh
> 
> Populate the enocder software structure to reflect the updated
> crtc appropriately during crtc enable/disable for a new commit
> while taking care of the self refresh transitions when crtc
> disable is triggered from the drm self refresh library.
> 
> Signed-off-by: Vinod Polimera <quic_vpolimer@...cinc.com>

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>

Adding the RB tag which was reviewed by Dmitry on V13.

> ---
>  drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c | 29
> +++++++++++++++++++++++++----
>  1 file changed, 25 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> index 60e5984..b1ec0c3 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> @@ -1022,8 +1022,17 @@ static void dpu_crtc_disable(struct drm_crtc *crtc,
> 
>  	DRM_DEBUG_KMS("crtc%d\n", crtc->base.id);
> 
> -	if (old_crtc_state->self_refresh_active)
> +	/* If disable is triggered while in self refresh mode,
> +	 * reset the encoder software state so that in enable
> +	 * it won't trigger a warn while assigning crtc.
> +	 */
> +	if (old_crtc_state->self_refresh_active) {
> +		drm_for_each_encoder_mask(encoder, crtc->dev,
> +					old_crtc_state->encoder_mask) {
> +			dpu_encoder_assign_crtc(encoder, NULL);
> +		}
>  		return;
> +	}
> 
>  	/* Disable/save vblank irq handling */
>  	drm_crtc_vblank_off(crtc);
> @@ -1036,7 +1045,14 @@ static void dpu_crtc_disable(struct drm_crtc *crtc,
>  		 */
>  		if (dpu_encoder_get_intf_mode(encoder) ==
> INTF_MODE_VIDEO)
>  			release_bandwidth = true;
> -		dpu_encoder_assign_crtc(encoder, NULL);
> +
> +		/*
> +		 * If disable is triggered during psr active(e.g: screen dim in
> PSR),
> +		 * we will need encoder->crtc connection to process the
> device sleep &
> +		 * preserve it during psr sequence.
> +		 */
> +		if (!crtc->state->self_refresh_active)
> +			dpu_encoder_assign_crtc(encoder, NULL);
>  	}
> 
>  	/* wait for frame_event_done completion */
> @@ -1084,6 +1100,9 @@ static void dpu_crtc_enable(struct drm_crtc *crtc,
>  	struct dpu_crtc *dpu_crtc = to_dpu_crtc(crtc);
>  	struct drm_encoder *encoder;
>  	bool request_bandwidth = false;
> +	struct drm_crtc_state *old_crtc_state;
> +
> +	old_crtc_state = drm_atomic_get_old_crtc_state(state, crtc);
> 
>  	pm_runtime_get_sync(crtc->dev->dev);
> 
> @@ -1106,8 +1125,10 @@ static void dpu_crtc_enable(struct drm_crtc *crtc,
>  	trace_dpu_crtc_enable(DRMID(crtc), true, dpu_crtc);
>  	dpu_crtc->enabled = true;
> 
> -	drm_for_each_encoder_mask(encoder, crtc->dev, crtc->state-
> >encoder_mask)
> -		dpu_encoder_assign_crtc(encoder, crtc);
> +	if (!old_crtc_state->self_refresh_active) {
> +		drm_for_each_encoder_mask(encoder, crtc->dev, crtc-
> >state->encoder_mask)
> +			dpu_encoder_assign_crtc(encoder, crtc);
> +	}
> 
>  	/* Enable/restore vblank irq handling */
>  	drm_crtc_vblank_on(crtc);
> --
> 2.7.4