linux-kernel - Re: [PATCH v4 4/4] drm/msm/dpu: manage DPU resources if CTM is requested

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Message-ID: <3c17e91a-4903-ac13-7829-54c2c31bab6f@linaro.org>
Date:   Sat, 18 Feb 2023 00:26:25 +0200
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Kalyan Thota <quic_kalyant@...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@...omium.org,
        dianders@...omium.org, swboyd@...omium.org,
        quic_vpolimer@...cinc.com, quic_abhinavk@...cinc.com,
        marijn.suijten@...ainline.org
Subject: Re: [PATCH v4 4/4] drm/msm/dpu: manage DPU resources if CTM is
 requested

On 13/02/2023 13:11, Kalyan Thota wrote:
> Allow modeset to be triggered during CTM enable/disable.
> In the modeset callbacks, DPU resources required for the
> CTM feature are managed appropriately.
> 
> Signed-off-by: Kalyan Thota <quic_kalyant@...cinc.com>

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

> ---
>   drivers/gpu/drm/msm/msm_atomic.c | 18 ++++++++++++++++++
>   drivers/gpu/drm/msm/msm_drv.c    |  2 +-
>   drivers/gpu/drm/msm/msm_drv.h    |  1 +
>   3 files changed, 20 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/msm/msm_atomic.c b/drivers/gpu/drm/msm/msm_atomic.c
> index 1686fbb..e3e607c 100644
> --- a/drivers/gpu/drm/msm/msm_atomic.c
> +++ b/drivers/gpu/drm/msm/msm_atomic.c
> @@ -179,6 +179,24 @@ static unsigned get_crtc_mask(struct drm_atomic_state *state)
>   	return mask;
>   }
>   
> +int msm_atomic_check(struct drm_device *dev, struct drm_atomic_state *state)
> +{
> +	struct drm_crtc_state *old_crtc_state, *new_crtc_state;
> +	struct drm_crtc *crtc;
> +	int i;
> +

I hope this can be gone for good if at some point we have CRTC resource 
allocation split from encoder resource alloc.

> +	for_each_oldnew_crtc_in_state(state, crtc, old_crtc_state,
> +				      new_crtc_state, i) {
> +		if ((old_crtc_state->ctm && !new_crtc_state->ctm) ||
> +		    (!old_crtc_state->ctm && new_crtc_state->ctm)) {
> +			new_crtc_state->mode_changed = true;
> +			state->allow_modeset = true;
> +		}
> +	}
> +
> +	return drm_atomic_helper_check(dev, state);
> +}
> +
>   void msm_atomic_commit_tail(struct drm_atomic_state *state)
>   {
>   	struct drm_device *dev = state->dev;
> diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c
> index 0759e2d..3221284 100644
> --- a/drivers/gpu/drm/msm/msm_drv.c
> +++ b/drivers/gpu/drm/msm/msm_drv.c
> @@ -52,7 +52,7 @@
>   static const struct drm_mode_config_funcs mode_config_funcs = {
>   	.fb_create = msm_framebuffer_create,
>   	.output_poll_changed = drm_fb_helper_output_poll_changed,
> -	.atomic_check = drm_atomic_helper_check,
> +	.atomic_check = msm_atomic_check,
>   	.atomic_commit = drm_atomic_helper_commit,
>   };
>   
> diff --git a/drivers/gpu/drm/msm/msm_drv.h b/drivers/gpu/drm/msm/msm_drv.h
> index ea80846..7d0243a 100644
> --- a/drivers/gpu/drm/msm/msm_drv.h
> +++ b/drivers/gpu/drm/msm/msm_drv.h
> @@ -209,6 +209,7 @@ int msm_atomic_init_pending_timer(struct msm_pending_timer *timer,
>   		struct msm_kms *kms, int crtc_idx);
>   void msm_atomic_destroy_pending_timer(struct msm_pending_timer *timer);
>   void msm_atomic_commit_tail(struct drm_atomic_state *state);
> +int msm_atomic_check(struct drm_device *dev, struct drm_atomic_state *state);
>   struct drm_atomic_state *msm_atomic_state_alloc(struct drm_device *dev);
>   void msm_atomic_state_clear(struct drm_atomic_state *state);
>   void msm_atomic_state_free(struct drm_atomic_state *state);

-- 
With best wishes
Dmitry