linux-kernel - Re: [PATCH v4 1/7] drm/msm/disp/dpu1: clear dpu_assign_crtc and get crtc from drm_enc instead of dpu

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Message-ID: <5d469759-0619-eece-902d-df8ac6583f22@linaro.org>
Date:   Tue, 5 Jul 2022 22:03:58 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Vinod Polimera <quic_vpolimer@...cinc.com>,
        dri-devel@...ts.freedesktop.org, linux-arm-msm@...r.kernel.org,
        freedreno@...ts.freedesktop.org, devicetree@...r.kernel.org
Cc:     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, bjorn.andersson@...aro.org,
        quic_aravindh@...cinc.com, quic_abhinavk@...cinc.com,
        quic_sbillaka@...cinc.com
Subject: Re: [PATCH v4 1/7] drm/msm/disp/dpu1: clear dpu_assign_crtc and get
 crtc from drm_enc instead of dpu_enc

On 05/07/2022 20:00, Vinod Polimera wrote:
> Update crtc retrieval from dpu_enc to drm_enc, since new links get set
> as part of the update legacy mode set. The dpu_enc->crtc cache is no
> more needed, hence cleaning it as part of this change.

NAK. Quoting the documentation:

only really meaningful for non-atomic drivers. Atomic drivers should 
instead check &drm_connector_state.crtc.

Please adjust according to the documentation.

> 
> Signed-off-by: Vinod Polimera <quic_vpolimer@...cinc.com>
> ---
>   drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c    |  4 ----
>   drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c | 18 +++---------------
>   drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h |  8 --------
>   3 files changed, 3 insertions(+), 27 deletions(-)
> 
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> index b56f777..f91e3d1 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> @@ -972,7 +972,6 @@ 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);
>   	}
>   
>   	/* wait for frame_event_done completion */
> @@ -1042,9 +1041,6 @@ 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);
> -
>   	/* Enable/restore vblank irq handling */
>   	drm_crtc_vblank_on(crtc);
>   }
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> index 52516eb..5629c0b 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> @@ -1254,8 +1254,8 @@ static void dpu_encoder_vblank_callback(struct drm_encoder *drm_enc,
>   	dpu_enc = to_dpu_encoder_virt(drm_enc);
>   
>   	spin_lock_irqsave(&dpu_enc->enc_spinlock, lock_flags);
> -	if (dpu_enc->crtc)
> -		dpu_crtc_vblank_callback(dpu_enc->crtc);
> +	if (drm_enc->crtc)
> +		dpu_crtc_vblank_callback(drm_enc->crtc);
>   	spin_unlock_irqrestore(&dpu_enc->enc_spinlock, lock_flags);
>   
>   	atomic_inc(&phy_enc->vsync_cnt);
> @@ -1280,18 +1280,6 @@ static void dpu_encoder_underrun_callback(struct drm_encoder *drm_enc,
>   	DPU_ATRACE_END("encoder_underrun_callback");
>   }
>   
> -void dpu_encoder_assign_crtc(struct drm_encoder *drm_enc, struct drm_crtc *crtc)
> -{
> -	struct dpu_encoder_virt *dpu_enc = to_dpu_encoder_virt(drm_enc);
> -	unsigned long lock_flags;
> -
> -	spin_lock_irqsave(&dpu_enc->enc_spinlock, lock_flags);
> -	/* crtc should always be cleared before re-assigning */
> -	WARN_ON(crtc && dpu_enc->crtc);
> -	dpu_enc->crtc = crtc;
> -	spin_unlock_irqrestore(&dpu_enc->enc_spinlock, lock_flags);
> -}
> -
>   void dpu_encoder_toggle_vblank_for_crtc(struct drm_encoder *drm_enc,
>   					struct drm_crtc *crtc, bool enable)
>   {
> @@ -1302,7 +1290,7 @@ void dpu_encoder_toggle_vblank_for_crtc(struct drm_encoder *drm_enc,
>   	trace_dpu_enc_vblank_cb(DRMID(drm_enc), enable);
>   
>   	spin_lock_irqsave(&dpu_enc->enc_spinlock, lock_flags);
> -	if (dpu_enc->crtc != crtc) {
> +	if (drm_enc->crtc != crtc) {
>   		spin_unlock_irqrestore(&dpu_enc->enc_spinlock, lock_flags);
>   		return;
>   	}
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h
> index 781d41c..edba815 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h
> @@ -39,14 +39,6 @@ struct msm_display_info {
>   };
>   
>   /**
> - * dpu_encoder_assign_crtc - Link the encoder to the crtc it's assigned to
> - * @encoder:	encoder pointer
> - * @crtc:	crtc pointer
> - */
> -void dpu_encoder_assign_crtc(struct drm_encoder *encoder,
> -			     struct drm_crtc *crtc);
> -
> -/**
>    * dpu_encoder_toggle_vblank_for_crtc - Toggles vblank interrupts on or off if
>    *	the encoder is assigned to the given crtc
>    * @encoder:	encoder pointer


-- 
With best wishes
Dmitry