[PATCH v2 09/17] drm/msm/dpu: add an API to reset the encoder related hw blocks

[Dmitry Baryshkov]

On 20/04/2022 04:46, Abhinav Kumar wrote:
> Add an API to reset the encoder related hw blocks to ensure
> a proper teardown of the pipeline. At the moment this is being
> used only for the writeback encoder but eventually we can start
> using this for all interfaces.
> 
> changes in v2:
> 	- split the writeback part to another commit
> 
> Signed-off-by: Abhinav Kumar <quic_abhinavk at quicinc.com>

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov at linaro.org>

A minor question: do we need to also reset the DSPP alongside resetting 
the LM?

> ---
>   drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c      | 82 ++++++++++++++++++++++++
>   drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys.h |  7 ++
>   2 files changed, 89 insertions(+)
> 
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> index 4523693..0e31ad3 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> @@ -1,5 +1,6 @@
>   // SPDX-License-Identifier: GPL-2.0-only
>   /*
> + * Copyright (c) 2022 Qualcomm Innovation Center, Inc. All rights reserved.
>    * Copyright (c) 2014-2018, 2020-2021 The Linux Foundation. All rights reserved.
>    * Copyright (C) 2013 Red Hat
>    * Author: Rob Clark <robdclark at gmail.com>
> @@ -22,6 +23,7 @@
>   #include "dpu_hw_ctl.h"
>   #include "dpu_hw_dspp.h"
>   #include "dpu_hw_dsc.h"
> +#include "dpu_hw_merge3d.h"
>   #include "dpu_formats.h"
>   #include "dpu_encoder_phys.h"
>   #include "dpu_crtc.h"
> @@ -1838,6 +1840,86 @@ void dpu_encoder_kickoff(struct drm_encoder *drm_enc)
>   	DPU_ATRACE_END("encoder_kickoff");
>   }
>   
> +static void dpu_encoder_helper_reset_mixers(struct dpu_encoder_phys *phys_enc)
> +{
> +	struct dpu_hw_mixer_cfg mixer;
> +	int i, num_lm;
> +	u32 flush_mask = 0;
> +	struct dpu_global_state *global_state;
> +	struct dpu_hw_blk *hw_lm[2];
> +	struct dpu_hw_mixer *hw_mixer[2];
> +	struct dpu_hw_ctl *ctl = phys_enc->hw_ctl;
> +
> +	memset(&mixer, 0, sizeof(mixer));
> +
> +	/* reset all mixers for this encoder */
> +	if (phys_enc->hw_ctl->ops.clear_all_blendstages)
> +		phys_enc->hw_ctl->ops.clear_all_blendstages(phys_enc->hw_ctl);
> +
> +	global_state = dpu_kms_get_existing_global_state(phys_enc->dpu_kms);
> +
> +	num_lm = dpu_rm_get_assigned_resources(&phys_enc->dpu_kms->rm, global_state,
> +		phys_enc->parent->base.id, DPU_HW_BLK_LM, hw_lm, ARRAY_SIZE(hw_lm));
> +
> +	for (i = 0; i < num_lm; i++) {
> +		hw_mixer[i] = to_dpu_hw_mixer(hw_lm[i]);
> +		flush_mask = phys_enc->hw_ctl->ops.get_bitmask_mixer(ctl, hw_mixer[i]->idx);
> +		if (phys_enc->hw_ctl->ops.update_pending_flush)
> +			phys_enc->hw_ctl->ops.update_pending_flush(ctl, flush_mask);
> +
> +		/* clear all blendstages */
> +		if (phys_enc->hw_ctl->ops.setup_blendstage)
> +			phys_enc->hw_ctl->ops.setup_blendstage(ctl, hw_mixer[i]->idx, NULL);
> +	}
> +}
> +
> +void dpu_encoder_helper_phys_cleanup(struct dpu_encoder_phys *phys_enc)
> +{
> +	struct dpu_hw_ctl *ctl = phys_enc->hw_ctl;
> +	struct dpu_hw_intf_cfg intf_cfg = { 0 };
> +	int i;
> +	struct dpu_encoder_virt *dpu_enc;
> +
> +	dpu_enc = to_dpu_encoder_virt(phys_enc->parent);
> +
> +	phys_enc->hw_ctl->ops.reset(ctl);
> +
> +	dpu_encoder_helper_reset_mixers(phys_enc);
> +
> +	for (i = 0; i < dpu_enc->num_phys_encs; i++) {
> +		if (dpu_enc->phys_encs[i] && phys_enc->hw_intf->ops.bind_pingpong_blk)
> +			phys_enc->hw_intf->ops.bind_pingpong_blk(
> +					dpu_enc->phys_encs[i]->hw_intf, false,
> +					dpu_enc->phys_encs[i]->hw_pp->idx);
> +
> +		/* mark INTF flush as pending */
> +		if (phys_enc->hw_ctl->ops.update_pending_flush_intf)
> +			phys_enc->hw_ctl->ops.update_pending_flush_intf(phys_enc->hw_ctl,
> +					dpu_enc->phys_encs[i]->hw_intf->idx);
> +	}
> +
> +	/* reset the merge 3D HW block */
> +	if (phys_enc->hw_pp->merge_3d) {
> +		phys_enc->hw_pp->merge_3d->ops.setup_3d_mode(phys_enc->hw_pp->merge_3d,
> +				BLEND_3D_NONE);
> +		if (phys_enc->hw_ctl->ops.update_pending_flush_merge_3d)
> +			phys_enc->hw_ctl->ops.update_pending_flush_merge_3d(ctl,
> +					phys_enc->hw_pp->merge_3d->idx);
> +	}
> +
> +	intf_cfg.stream_sel = 0; /* Don't care value for video mode */
> +	intf_cfg.mode_3d = dpu_encoder_helper_get_3d_blend_mode(phys_enc);
> +	if (phys_enc->hw_pp->merge_3d)
> +		intf_cfg.merge_3d = phys_enc->hw_pp->merge_3d->idx;
> +
> +	if (ctl->ops.reset_intf_cfg)
> +		ctl->ops.reset_intf_cfg(ctl, &intf_cfg);
> +
> +	ctl->ops.trigger_flush(ctl);
> +	ctl->ops.trigger_start(ctl);
> +	ctl->ops.clear_pending_flush(ctl);
> +}
> +
>   void dpu_encoder_prepare_commit(struct drm_encoder *drm_enc)
>   {
>   	struct dpu_encoder_virt *dpu_enc;
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys.h
> index 706b566..544a9a4 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys.h
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys.h
> @@ -1,5 +1,6 @@
>   /* SPDX-License-Identifier: GPL-2.0-only */
>   /*
> + * Copyright (c) 2022 Qualcomm Innovation Center, Inc. All rights reserved.
>    * Copyright (c) 2015-2018 The Linux Foundation. All rights reserved.
>    */
>   
> @@ -350,4 +351,10 @@ int dpu_encoder_helper_wait_for_irq(struct dpu_encoder_phys *phys_enc,
>   		void (*func)(void *arg, int irq_idx),
>   		struct dpu_encoder_wait_info *wait_info);
>   
> +/**
> + * dpu_encoder_helper_phys_cleanup - helper to cleanup dpu pipeline
> + * @phys_enc: Pointer to physical encoder structure
> + */
> +void dpu_encoder_helper_phys_cleanup(struct dpu_encoder_phys *phys_enc);
> +
>   #endif /* __dpu_encoder_phys_H__ */


-- 
With best wishes
Dmitry