Re: [Freedreno] [PATCH v2 5/6] drm/msm/dpu: drop unused lm_max_width from RM

[Arnaud Vrac <rawoul@gmail.com>]

Hi Dmitry,

Le dim. 16 mai 2021 à 00:58, Dmitry Baryshkov
<dmitry.baryshkov@linaro.org> a écrit :
>
> No code uses lm_max_width from resource manager, so drop it.

I have a pending patch which uses this value to properly determine the
number of LMs to use in the topology. Currently the code uses a
hardcoded value of MAX_HDISPLAY_SPLIT (1080), but in reality I believe
it should be the lm max width (typically 2560). This will avoid using
two LMs to render resolutions like 1280x720 or 1920x1080.

I haven't managed to make hdmi work yet on DPU (testing on MSM8998) so
I'm not ready to send the patch yet, but it doesn't seem to trigger
any error.

-Arnaud


>
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
> ---
>  drivers/gpu/drm/msm/disp/dpu1/dpu_rm.c | 12 ------------
>  drivers/gpu/drm/msm/disp/dpu1/dpu_rm.h |  4 ----
>  2 files changed, 16 deletions(-)
>
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_rm.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_rm.c
> index c36700a06ff2..ec4387ad1182 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_rm.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_rm.c
> @@ -88,18 +88,6 @@ int dpu_rm_init(struct dpu_rm *rm,
>                         goto fail;
>                 }
>                 rm->mixer_blks[lm->id - LM_0] = &hw->base;
> -
> -               if (!rm->lm_max_width) {
> -                       rm->lm_max_width = lm->sblk->maxwidth;
> -               } else if (rm->lm_max_width != lm->sblk->maxwidth) {
> -                       /*
> -                        * Don't expect to have hw where lm max widths differ.
> -                        * If found, take the min.
> -                        */
> -                       DPU_ERROR("unsupported: lm maxwidth differs\n");
> -                       if (rm->lm_max_width > lm->sblk->maxwidth)
> -                               rm->lm_max_width = lm->sblk->maxwidth;
> -               }
>         }
>
>         for (i = 0; i < cat->ctl_count; i++) {
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_rm.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_rm.h
> index ee90b1233430..0c9113581d71 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_rm.h
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_rm.h
> @@ -17,14 +17,10 @@ struct dpu_global_state;
>   * struct dpu_rm - DPU dynamic hardware resource manager
>   * @mixer_blks: array of layer mixer hardware resources
>   * @ctl_blks: array of ctl hardware resources
> - * @lm_max_width: cached layer mixer maximum width
> - * @rm_lock: resource manager mutex
>   */
>  struct dpu_rm {
>         struct dpu_hw_blk *mixer_blks[LM_MAX - LM_0];
>         struct dpu_hw_blk *ctl_blks[CTL_MAX - CTL_0];
> -
> -       uint32_t lm_max_width;
>  };
>
>  struct dpu_kms;
> --
> 2.30.2
>
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