Re: [PATCH 3/8] drm/msm/dpu: drop dpu_core_perf_params::max_per_pipe_ib

[Konrad Dybcio <konrad.dybcio@linaro.org>]

On 20.06.2023 02:08, Dmitry Baryshkov wrote:
> The max_per_pipe_ib is a constant across all CRTCs and is read from the
> catalog. Drop corresponding calculations and read the value directly at
> icc_set_bw() time.
> 
> Suggested-by: Konrad Dybcio <konrad.dybcio@linaro.org>
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
> ---
This looks good, but doesn't apply on next-20230620

Konrad
>  drivers/gpu/drm/msm/disp/dpu1/dpu_core_perf.c | 17 +++++------------
>  drivers/gpu/drm/msm/disp/dpu1/dpu_core_perf.h |  2 --
>  drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c      |  2 --
>  3 files changed, 5 insertions(+), 16 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 9902febc72c0..ba146af73bc5 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_core_perf.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_core_perf.c
> @@ -105,13 +105,12 @@ static void _dpu_core_perf_calc_crtc(struct dpu_kms *kms,
>  	memset(perf, 0, sizeof(struct dpu_core_perf_params));
>  
>  	perf->bw_ctl = _dpu_core_perf_calc_bw(kms, crtc);
> -	perf->max_per_pipe_ib = kms->catalog->perf->min_dram_ib;
>  	perf->core_clk_rate = _dpu_core_perf_calc_clk(kms, crtc, state);
>  
>  	DRM_DEBUG_ATOMIC(
> -		"crtc=%d clk_rate=%llu core_ib=%llu core_ab=%llu\n",
> +		"crtc=%d clk_rate=%llu core_ab=%llu\n",
>  			crtc->base.id, perf->core_clk_rate,
> -			perf->max_per_pipe_ib, perf->bw_ctl);
> +			perf->bw_ctl);
>  }
>  
>  int dpu_core_perf_crtc_check(struct drm_crtc *crtc,
> @@ -199,9 +198,6 @@ static int _dpu_core_perf_crtc_update_bus(struct dpu_kms *kms,
>  				dpu_crtc_get_client_type(tmp_crtc)) {
>  			dpu_cstate = to_dpu_crtc_state(tmp_crtc->state);
>  
> -			perf.max_per_pipe_ib = max(perf.max_per_pipe_ib,
> -					dpu_cstate->new_perf.max_per_pipe_ib);
> -
>  			perf.bw_ctl += dpu_cstate->new_perf.bw_ctl;
>  
>  			DRM_DEBUG_ATOMIC("crtc=%d bw=%llu paths:%d\n",
> @@ -217,7 +213,7 @@ static int _dpu_core_perf_crtc_update_bus(struct dpu_kms *kms,
>  	do_div(avg_bw, (kms->num_paths * 1000)); /*Bps_to_icc*/
>  
>  	for (i = 0; i < kms->num_paths; i++)
> -		icc_set_bw(kms->path[i], avg_bw, perf.max_per_pipe_ib);
> +		icc_set_bw(kms->path[i], avg_bw, kms->catalog->perf->min_dram_ib);
>  
>  	return ret;
>  }
> @@ -320,15 +316,12 @@ int dpu_core_perf_crtc_update(struct drm_crtc *crtc,
>  		 * 2. new bandwidth vote - "ab or ib vote" is lower
>  		 *    than current vote at end of commit or stop.
>  		 */
> -		if ((params_changed && ((new->bw_ctl > old->bw_ctl) ||
> -			(new->max_per_pipe_ib > old->max_per_pipe_ib)))	||
> -			(!params_changed && ((new->bw_ctl < old->bw_ctl) ||
> -			(new->max_per_pipe_ib < old->max_per_pipe_ib)))) {
> +		if ((params_changed && new->bw_ctl > old->bw_ctl) ||
> +		    (!params_changed && new->bw_ctl < old->bw_ctl)) {
>  			DRM_DEBUG_ATOMIC("crtc=%d p=%d new_bw=%llu,old_bw=%llu\n",
>  				crtc->base.id, params_changed,
>  				new->bw_ctl, old->bw_ctl);
>  			old->bw_ctl = new->bw_ctl;
> -			old->max_per_pipe_ib = new->max_per_pipe_ib;
>  			update_bus = true;
>  		}
>  
> 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 e02cc2324af2..2bf7836f79bb 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_core_perf.h
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_core_perf.h
> @@ -16,12 +16,10 @@
>  
>  /**
>   * struct dpu_core_perf_params - definition of performance parameters
> - * @max_per_pipe_ib: maximum instantaneous bandwidth request
>   * @bw_ctl: arbitrated bandwidth request
>   * @core_clk_rate: core clock rate request
>   */
>  struct dpu_core_perf_params {
> -	u64 max_per_pipe_ib;
>  	u64 bw_ctl;
>  	u64 core_clk_rate;
>  };
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> index 1edf2b6b0a26..ff5d306b95ed 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> @@ -1400,8 +1400,6 @@ static int dpu_crtc_debugfs_state_show(struct seq_file *s, void *v)
>  	seq_printf(s, "core_clk_rate: %llu\n",
>  			dpu_crtc->cur_perf.core_clk_rate);
>  	seq_printf(s, "bw_ctl: %llu\n", dpu_crtc->cur_perf.bw_ctl);
> -	seq_printf(s, "max_per_pipe_ib: %llu\n",
> -				dpu_crtc->cur_perf.max_per_pipe_ib);
>  
>  	return 0;
>  }