On Mon, Feb 17, 2025 at 10:16:01PM +0800, Jun Nie wrote:
> Currently, only 2 pipes are used at most for a plane. A stage structure
> describes the configuration for a mixer pair. So only one stage is needed
> for current usage cases. The quad-pipe case will be added in future and 2
> stages are used in the case. So extend the stage to an array with array size
> STAGES_PER_PLANE and blend pipes per mixer pair with configuration in the
> stage structure.
>
> Signed-off-by: Jun Nie <jun....@linaro.org>
> ---
> drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c | 45
> +++++++++++++++++++----------
> drivers/gpu/drm/msm/disp/dpu1/dpu_hw_mdss.h | 1 +
> 2 files changed, 30 insertions(+), 16 deletions(-)
>
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> index
> 81474823e6799132db71c9712046d359e3535d90..50acaf25a3ffcc94354faaa816fe74566784844c
> 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> @@ -401,7 +401,7 @@ static void _dpu_crtc_blend_setup_pipe(struct drm_crtc
> *crtc,
> struct dpu_hw_stage_cfg *stage_cfg
> )
> {
> - uint32_t lm_idx;
> + uint32_t lm_idx, lm_in_pair;
> enum dpu_sspp sspp_idx;
> struct drm_plane_state *state;
>
> @@ -426,7 +426,8 @@ static void _dpu_crtc_blend_setup_pipe(struct drm_crtc
> *crtc,
> stage_cfg->multirect_index[stage][stage_idx] = pipe->multirect_index;
>
> /* blend config update */
> - for (lm_idx = 0; lm_idx < num_mixers; lm_idx++)
> + lm_in_pair = num_mixers > 1 ? 2 : 1;
> + for (lm_idx = 0; lm_idx < lm_in_pair; lm_idx++)
>
> mixer[lm_idx].lm_ctl->ops.update_pending_flush_sspp(mixer[lm_idx].lm_ctl,
> sspp_idx);
I almost missed this. Why is this necessary?
> }
>
[...]
> @@ -535,8 +543,13 @@ static void _dpu_crtc_blend_setup(struct drm_crtc *crtc)
> mixer[i].mixer_op_mode,
> ctl->idx - CTL_0);
>
> + /*
> + * call dpu_hw_ctl_setup_blendstage() to blend layers per stage
> cfg.
> + * There are 4 mixers at most. The first 2 are for the left
> half, and
> + * the later 2 are for the right half.
> + */
The comment is invalid until you introduce quad pipe, currently there
are 2 mixers at most. However you can just say something like 'stage
data is shared between PIPES_PER_STAGE pipes'.
> ctl->ops.setup_blendstage(ctl, mixer[i].hw_lm->idx,
> - &stage_cfg);
> + &stage_cfg[i / PIPES_PER_STAGE]);
> }
> }
>
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_mdss.h
> b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_mdss.h
> index
> 5f010d36672cc6440c69779908b315aab285eaf0..64e220987be5682f26d02074505c5474a547a814
> 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_mdss.h
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_mdss.h
> @@ -34,6 +34,7 @@
> #define DPU_MAX_PLANES 4
> #endif
>
> +#define STAGES_PER_PLANE 2
> #define PIPES_PER_PLANE 2
> #define PIPES_PER_STAGE 2
> #ifndef DPU_MAX_DE_CURVES
>
> --
> 2.34.1
>
--
With best wishes
Dmitry
