linux-kernel - Re: [PATCH v6 10/10] drm/msm/disp/dpu: check for crtc enable rather than crtc active to release shared resources

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Message-ID: <2ba431fb-ec22-81da-29fb-1d7ecd1a8722@linaro.org>
Date:   Mon, 11 Jul 2022 17:19:48 +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 v6 10/10] drm/msm/disp/dpu: check for crtc enable rather
 than crtc active to release shared resources

On 11/07/2022 15:57, Vinod Polimera wrote:
> According to KMS documentation, The driver must not release any shared
> resources if active is set to false but enable still true.
> 
> Fixes: ccc862b957c6 ("drm/msm/dpu: Fix reservation failures in modeset")
> Signed-off-by: Vinod Polimera <quic_vpolimer@...cinc.com>

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

> ---
>   drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> index 5dfb56a..02a71d1 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> @@ -592,7 +592,7 @@ static int dpu_encoder_virt_atomic_check(
>   		if (drm_atomic_crtc_needs_modeset(crtc_state)) {
>   			dpu_rm_release(global_state, drm_enc);
>   
> -			if (!crtc_state->active_changed || crtc_state->active)
> +			if (!crtc_state->active_changed || crtc_state->enable)
>   				ret = dpu_rm_reserve(&dpu_kms->rm, global_state,
>   						drm_enc, crtc_state, topology);
>   		}


-- 
With best wishes
Dmitry