Re: [PATCH 5/8] drm/msm/dpu: drop the dpu_core_perf_crtc_update()'s stop_req param

[Abhinav Kumar <quic_abhinavk@quicinc.com>]

On 6/19/2023 5:08 PM, Dmitry Baryshkov wrote:
> The stop_req is true only in the dpu_crtc_disable() case, when
> crtc->enable has already been set to false. This renders the stop_req
> argument useless. Remove it completely.
> 

What about the enable case?

That time dpu_crtc->enabled  will be false but you need valid clock and 
BW that time when you want to enable.

> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
> ---
>   drivers/gpu/drm/msm/disp/dpu1/dpu_core_perf.c | 12 ++++++------
>   drivers/gpu/drm/msm/disp/dpu1/dpu_core_perf.h |  3 +--
>   drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c      |  6 +++---
>   3 files changed, 10 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_core_perf.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_core_perf.c
> index f8d5c87d0915..773e641eab28 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_core_perf.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_core_perf.c
> @@ -277,7 +277,7 @@ static u64 _dpu_core_perf_get_core_clk_rate(struct dpu_kms *kms)
>   }
>   
>   int dpu_core_perf_crtc_update(struct drm_crtc *crtc,
> -		int params_changed, bool stop_req)
> +			      int params_changed)
>   {
>   	struct dpu_core_perf_params *new, *old;
>   	bool update_bus = false, update_clk = false;
> @@ -301,13 +301,13 @@ int dpu_core_perf_crtc_update(struct drm_crtc *crtc,
>   	dpu_crtc = to_dpu_crtc(crtc);
>   	dpu_cstate = to_dpu_crtc_state(crtc->state);
>   
> -	DRM_DEBUG_ATOMIC("crtc:%d stop_req:%d core_clk:%llu\n",
> -			crtc->base.id, stop_req, kms->perf.core_clk_rate);
> +	DRM_DEBUG_ATOMIC("crtc:%d enabled:%d core_clk:%llu\n",
> +			crtc->base.id, crtc->enabled, kms->perf.core_clk_rate);
>   
>   	old = &dpu_crtc->cur_perf;
>   	new = &dpu_cstate->new_perf;
>   
> -	if (crtc->enabled && !stop_req) {
> +	if (crtc->enabled) {
>   		/*
>   		 * cases for bus bandwidth update.
>   		 * 1. new bandwidth vote - "ab or ib vote" is higher
> @@ -337,7 +337,7 @@ int dpu_core_perf_crtc_update(struct drm_crtc *crtc,
>   	}
>   
>   	trace_dpu_perf_crtc_update(crtc->base.id, new->bw_ctl,
> -		new->core_clk_rate, stop_req, update_bus, update_clk);
> +		new->core_clk_rate, !crtc->enabled, update_bus, update_clk);
>   
>   	if (update_bus) {
>   		ret = _dpu_core_perf_crtc_update_bus(kms, crtc);
> @@ -355,7 +355,7 @@ int dpu_core_perf_crtc_update(struct drm_crtc *crtc,
>   	if (update_clk) {
>   		clk_rate = _dpu_core_perf_get_core_clk_rate(kms);
>   
> -		trace_dpu_core_perf_update_clk(kms->dev, stop_req, clk_rate);
> +		trace_dpu_core_perf_update_clk(kms->dev, !crtc->enabled, clk_rate);
>   
>   		clk_rate = min(clk_rate, kms->perf.max_core_clk_rate);
>   		ret = dev_pm_opp_set_rate(&kms->pdev->dev, clk_rate);
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_core_perf.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_core_perf.h
> index 2bf7836f79bb..c29ec72984b8 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_core_perf.h
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_core_perf.h
> @@ -58,11 +58,10 @@ int dpu_core_perf_crtc_check(struct drm_crtc *crtc,
>    * dpu_core_perf_crtc_update - update performance of the given crtc
>    * @crtc: Pointer to crtc
>    * @params_changed: true if crtc parameters are modified
> - * @stop_req: true if this is a stop request
>    * return: zero if success, or error code otherwise
>    */
>   int dpu_core_perf_crtc_update(struct drm_crtc *crtc,
> -		int params_changed, bool stop_req);
> +			      int params_changed);
>   
>   /**
>    * dpu_core_perf_crtc_release_bw - release bandwidth of the given crtc
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> index ff5d306b95ed..214229d11e3e 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> @@ -718,7 +718,7 @@ static void dpu_crtc_frame_event_cb(void *data, u32 event)
>   void dpu_crtc_complete_commit(struct drm_crtc *crtc)
>   {
>   	trace_dpu_crtc_complete_commit(DRMID(crtc));
> -	dpu_core_perf_crtc_update(crtc, 0, false);
> +	dpu_core_perf_crtc_update(crtc, 0);
>   	_dpu_crtc_complete_flip(crtc);
>   }
>   
> @@ -884,7 +884,7 @@ static void dpu_crtc_atomic_flush(struct drm_crtc *crtc,
>   		return;
>   
>   	/* update performance setting before crtc kickoff */
> -	dpu_core_perf_crtc_update(crtc, 1, false);
> +	dpu_core_perf_crtc_update(crtc, 1);
>   
>   	/*
>   	 * Final plane updates: Give each plane a chance to complete all
> @@ -1100,7 +1100,7 @@ static void dpu_crtc_disable(struct drm_crtc *crtc,
>   		atomic_set(&dpu_crtc->frame_pending, 0);
>   	}
>   
> -	dpu_core_perf_crtc_update(crtc, 0, true);
> +	dpu_core_perf_crtc_update(crtc, 0);
>   
>   	drm_for_each_encoder_mask(encoder, crtc->dev, crtc->state->encoder_mask)
>   		dpu_encoder_register_frame_event_callback(encoder, NULL, NULL);