Re: [PATCH 12/14] drm/msm/dpu: remove topology name

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On Tue, Aug 28, 2018 at 05:40:01PM -0700, Jeykumar Sankaran wrote:
> Strip down the support for topology enums. It
> can be replaced with simple hw count checks.
> 

Changes in v4:
...

> Signed-off-by: Jeykumar Sankaran <jsanka@xxxxxxxxxxxxxx>
> ---
>  drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c        |  3 --
>  drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h        |  1 -
>  drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys.h   |  9 ++++--
>  .../gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c   |  7 +++--
>  drivers/gpu/drm/msm/disp/dpu1/dpu_rm.c             | 36 ++++++----------------
>  drivers/gpu/drm/msm/disp/dpu1/dpu_rm.h             | 24 ---------------
>  6 files changed, 19 insertions(+), 61 deletions(-)
> 
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> index dbf669e..56ef349 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> @@ -1013,7 +1013,6 @@ static void dpu_encoder_virt_mode_set(struct drm_encoder *drm_enc,
>  	struct drm_connector *conn = NULL, *conn_iter;
>  	struct dpu_rm_hw_iter pp_iter, ctl_iter;
>  	struct msm_display_topology topology;
> -	enum dpu_rm_topology_name topology_name;
>  	struct dpu_hw_ctl *hw_ctl[MAX_CHANNELS_PER_ENC] = { NULL };
>  	int i = 0, ret;
>  
> @@ -1069,7 +1068,6 @@ static void dpu_encoder_virt_mode_set(struct drm_encoder *drm_enc,
>  		hw_ctl[i] = (struct dpu_hw_ctl *)ctl_iter.hw;
>  	}
>  
> -	topology_name = dpu_rm_get_topology_name(topology);
>  	for (i = 0; i < dpu_enc->num_phys_encs; i++) {
>  		struct dpu_encoder_phys *phys = dpu_enc->phys_encs[i];
>  
> @@ -1089,7 +1087,6 @@ static void dpu_encoder_virt_mode_set(struct drm_encoder *drm_enc,
>  			phys->hw_ctl = hw_ctl[i];
>  
>  			phys->connector = conn->state->connector;
> -			phys->topology_name = topology_name;
>  			if (phys->ops.mode_set)
>  				phys->ops.mode_set(phys, mode, adj_mode);
>  		}
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h
> index 60f809f..c5600e6 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h
> @@ -35,7 +35,6 @@
>   * @needs_cdm:	Encoder requests a CDM based on pixel format conversion needs
>   * @display_num_of_h_tiles: Number of horizontal tiles in case of split
>   *                          interface
> - * @topology:   Topology of the display
>   */
>  struct dpu_encoder_hw_resources {
>  	enum dpu_intf_mode intfs[INTF_MAX];
> 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 b3917e0..b5fc65c 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys.h
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys.h
> @@ -24,6 +24,7 @@
>  #include "dpu_hw_top.h"
>  #include "dpu_hw_cdm.h"
>  #include "dpu_encoder.h"
> +#include "dpu_crtc.h"
>  
>  #define DPU_ENCODER_NAME_MAX	16
>  
> @@ -213,7 +214,6 @@ struct dpu_encoder_irq {
>   * @split_role:		Role to play in a split-panel configuration
>   * @intf_mode:		Interface mode
>   * @intf_idx:		Interface index on dpu hardware
> - * @topology_name:	topology selected for the display
>   * @enc_spinlock:	Virtual-Encoder-Wide Spin Lock for IRQ purposes
>   * @enable_state:	Enable state tracking
>   * @vblank_refcount:	Reference count of vblank request
> @@ -243,7 +243,6 @@ struct dpu_encoder_phys {
>  	enum dpu_enc_split_role split_role;
>  	enum dpu_intf_mode intf_mode;
>  	enum dpu_intf intf_idx;
> -	enum dpu_rm_topology_name topology_name;
>  	spinlock_t *enc_spinlock;
>  	enum dpu_enc_enable_state enable_state;
>  	atomic_t vblank_refcount;
> @@ -361,11 +360,15 @@ struct dpu_encoder_phys *dpu_encoder_phys_cmd_init(
>  static inline enum dpu_3d_blend_mode dpu_encoder_helper_get_3d_blend_mode(
>  		struct dpu_encoder_phys *phys_enc)
>  {
> +	struct dpu_crtc_state *dpu_cstate;
> +
>  	if (!phys_enc || phys_enc->enable_state == DPU_ENC_DISABLING)
>  		return BLEND_3D_NONE;
>  
> +	dpu_cstate = to_dpu_crtc_state(phys_enc->parent->crtc->state);
> +
>  	if (phys_enc->split_role == ENC_ROLE_SOLO &&
> -	    phys_enc->topology_name == DPU_RM_TOPOLOGY_DUALPIPE_3DMERGE)
> +	    (dpu_cstate->num_mixers == 2))

I guess this should be CRTC_DUAL_MIXERS? Perhaps you should add a helper called
dpu_crtc_state_is_stereo() instead of littering these checks everywhere.

>  		return BLEND_3D_H_ROW_INT;
>  
>  	return BLEND_3D_NONE;
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c
> index 6de13f4..1643e2f 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c
> @@ -355,13 +355,14 @@ static void dpu_encoder_phys_vid_underrun_irq(void *arg, int irq_idx)
>  
>  static bool _dpu_encoder_phys_is_dual_ctl(struct dpu_encoder_phys *phys_enc)
>  {
> +	struct dpu_crtc_state *dpu_cstate;
> +
>  	if (!phys_enc)
>  		return false;
>  
> -	if (phys_enc->topology_name == DPU_RM_TOPOLOGY_DUALPIPE)
> -		return true;
> +	dpu_cstate = to_dpu_crtc_state(phys_enc->parent->crtc->state);
>  
> -	return false;
> +	return (dpu_cstate->num_ctls > 1);

Unnecessary parens

>  }
>  
>  static bool dpu_encoder_phys_vid_needs_single_flush(
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_rm.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_rm.c
> index 13c0a36..fbd489f 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_rm.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_rm.c
> @@ -33,7 +33,6 @@
>  				(t).num_intf == (r).num_intf)
>  
>  struct dpu_rm_topology_def {
> -	enum dpu_rm_topology_name top_name;
>  	int num_lm;
>  	int num_comp_enc;
>  	int num_intf;
> @@ -42,10 +41,10 @@ struct dpu_rm_topology_def {
>  };
>  
>  static const struct dpu_rm_topology_def g_top_table[] = {
> -	{   DPU_RM_TOPOLOGY_NONE,                 0, 0, 0, 0, false },
> -	{   DPU_RM_TOPOLOGY_SINGLEPIPE,           1, 0, 1, 1, false },
> -	{   DPU_RM_TOPOLOGY_DUALPIPE,             2, 0, 2, 2, true  },
> -	{   DPU_RM_TOPOLOGY_DUALPIPE_3DMERGE,     2, 0, 1, 1, false },
> +	{   0, 0, 0, 0, false },
> +	{   1, 0, 1, 1, false },
> +	{   2, 0, 2, 2, true  },
> +	{   2, 0, 1, 1, false },

You don't need this. The data it provides can be deduced already:
num_ctl == num_intf
needs_split_display == (num_intf > 1)

>  };
>  
>  /**
> @@ -72,13 +71,11 @@ struct dpu_rm_requirements {
>   * @enc_id:	Reservations are tracked by Encoder DRM object ID.
>   *		CRTCs may be connected to multiple Encoders.
>   *		An encoder or connector id identifies the display path.
> - * @topology	DRM<->HW topology use case
>   */
>  struct dpu_rm_rsvp {
>  	struct list_head list;
>  	uint32_t seq;
>  	uint32_t enc_id;
> -	enum dpu_rm_topology_name topology;
>  };
>  
>  /**
> @@ -122,8 +119,8 @@ static void _dpu_rm_print_rsvps(
>  	DPU_DEBUG("%d\n", stage);
>  
>  	list_for_each_entry(rsvp, &rm->rsvps, list) {
> -		DRM_DEBUG_KMS("%d rsvp[s%ue%u] topology %d\n", stage, rsvp->seq,
> -			      rsvp->enc_id, rsvp->topology);
> +		DRM_DEBUG_KMS("%d rsvp[s%ue%u]\n", stage, rsvp->seq,
> +			      rsvp->enc_id);
>  	}
>  
>  	for (type = 0; type < DPU_HW_BLK_MAX; type++) {
> @@ -146,18 +143,6 @@ struct dpu_hw_mdp *dpu_rm_get_mdp(struct dpu_rm *rm)
>  	return rm->hw_mdp;
>  }
>  
> -enum dpu_rm_topology_name
> -dpu_rm_get_topology_name(struct msm_display_topology topology)
> -{
> -	int i;
> -
> -	for (i = 0; i < DPU_RM_TOPOLOGY_MAX; i++)
> -		if (RM_IS_TOPOLOGY_MATCH(g_top_table[i], topology))
> -			return g_top_table[i].top_name;
> -
> -	return DPU_RM_TOPOLOGY_NONE;
> -}
> -
>  void dpu_rm_init_hw_iter(
>  		struct dpu_rm_hw_iter *iter,
>  		uint32_t enc_id,
> @@ -760,7 +745,6 @@ static int _dpu_rm_make_next_rsvp(
>  	/* Create reservation info, tag reserved blocks with it as we go */
>  	rsvp->seq = ++rm->rsvp_next_seq;
>  	rsvp->enc_id = enc->base.id;
> -	rsvp->topology = reqs->topology->top_name;
>  	list_add_tail(&rsvp->list, &rm->rsvps);
>  
>  	ret = _dpu_rm_reserve_lms(rm, rsvp, reqs);
> @@ -807,7 +791,7 @@ static int _dpu_rm_populate_requirements(
>  
>  	dpu_encoder_get_hw_resources(enc, &reqs->hw_res, conn_state);
>  
> -	for (i = 0; i < DPU_RM_TOPOLOGY_MAX; i++) {
> +	for (i = 0; i < ARRAY_SIZE(g_top_table); i++) {
>  		if (RM_IS_TOPOLOGY_MATCH(g_top_table[i],
>  					req_topology)) {
>  			reqs->topology = &g_top_table[i];

Since you can get rid of g_top_table, you can get rid of reqs->topology too.

> @@ -831,9 +815,8 @@ static int _dpu_rm_populate_requirements(
>  
>  	DRM_DEBUG_KMS("top_ctrl: 0x%llX num_h_tiles: %d\n", reqs->top_ctrl,
>  		      reqs->hw_res.display_num_of_h_tiles);
> -	DRM_DEBUG_KMS("num_lm: %d num_ctl: %d topology: %d split_display: %d\n",
> +	DRM_DEBUG_KMS("num_lm: %d num_ctl: %d split_display: %d\n",
>  		      reqs->topology->num_lm, reqs->topology->num_ctl,
> -		      reqs->topology->top_name,
>  		      reqs->topology->needs_split_display);
>  
>  	return 0;
> @@ -969,8 +952,7 @@ static int _dpu_rm_commit_rsvp(
>  	}
>  
>  	if (!ret)
> -		DRM_DEBUG_KMS("rsrv enc %d topology %d\n", rsvp->enc_id,
> -			      rsvp->topology);
> +		DRM_DEBUG_KMS("rsrv enc %d\n", rsvp->enc_id);

This debug message doesn't provide any value any longer.

>  
>  	return ret;
>  }
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_rm.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_rm.h
> index ffd1841..6fd9e7b 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_rm.h
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_rm.h
> @@ -21,21 +21,6 @@
>  #include "dpu_hw_top.h"
>  
>  /**
> - * enum dpu_rm_topology_name - HW resource use case in use by connector
> - * @DPU_RM_TOPOLOGY_NONE:                 No topology in use currently
> - * @DPU_RM_TOPOLOGY_SINGLEPIPE:           1 LM, 1 PP, 1 INTF/WB
> - * @DPU_RM_TOPOLOGY_DUALPIPE:             2 LM, 2 PP, 2 INTF/WB
> - * @DPU_RM_TOPOLOGY_DUALPIPE_3DMERGE:     2 LM, 2 PP, 3DMux, 1 INTF/WB
> - */
> -enum dpu_rm_topology_name {
> -	DPU_RM_TOPOLOGY_NONE = 0,
> -	DPU_RM_TOPOLOGY_SINGLEPIPE,
> -	DPU_RM_TOPOLOGY_DUALPIPE,
> -	DPU_RM_TOPOLOGY_DUALPIPE_3DMERGE,
> -	DPU_RM_TOPOLOGY_MAX,
> -};
> -
> -/**
>   * enum dpu_rm_topology_control - HW resource use case in use by connector
>   * @DPU_RM_TOPCTL_RESERVE_LOCK: If set, in AtomicTest phase, after a successful
>   *                              test, reserve the resources for this display.
> @@ -187,13 +172,4 @@ void dpu_rm_init_hw_iter(
>   */
>  int dpu_rm_check_property_topctl(uint64_t val);
>  
> -/**
> - * dpu_rm_get_topology_name - returns the name of the the given topology
> - *                            definition
> - * @topology: topology definition
> - * @Return: name of the topology
> - */
> -enum dpu_rm_topology_name
> -dpu_rm_get_topology_name(struct msm_display_topology topology);
> -
>  #endif /* __DPU_RM_H__ */
> -- 
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project
> 

-- 
Sean Paul, Software Engineer, Google / Chromium OS
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