// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (c) 2022-2023 Qualcomm Innovation Center, Inc. All rights reserved.
 * Copyright (c) 2014-2021 The Linux Foundation. All rights reserved.
 * Copyright (C) 2013 Red Hat
 * Author: Rob Clark <robdclark@gmail.com>
 */

#define pr_fmt(fmt)	"[drm:%s:%d] " fmt, __func__, __LINE__
#include <linux/sort.h>
#include <linux/debugfs.h>
#include <linux/ktime.h>
#include <linux/bits.h>

#include <drm/drm_atomic.h>
#include <drm/drm_blend.h>
#include <drm/drm_crtc.h>
#include <drm/drm_flip_work.h>
#include <drm/drm_framebuffer.h>
#include <drm/drm_mode.h>
#include <drm/drm_probe_helper.h>
#include <drm/drm_rect.h>
#include <drm/drm_vblank.h>
#include <drm/drm_self_refresh_helper.h>

#include "dpu_kms.h"
#include "dpu_hw_lm.h"
#include "dpu_hw_ctl.h"
#include "dpu_hw_dspp.h"
#include "dpu_crtc.h"
#include "dpu_plane.h"
#include "dpu_encoder.h"
#include "dpu_vbif.h"
#include "dpu_core_perf.h"
#include "dpu_trace.h"

/* layer mixer index on dpu_crtc */
#define LEFT_MIXER 0
#define RIGHT_MIXER 1

/* timeout in ms waiting for frame done */
#define DPU_CRTC_FRAME_DONE_TIMEOUT_MS	60

#define	CONVERT_S3_15(val) \
	(((((u64)val) & ~BIT_ULL(63)) >> 17) & GENMASK_ULL(17, 0))

static struct dpu_kms *_dpu_crtc_get_kms(struct drm_crtc *crtc)
{
	struct msm_drm_private *priv = crtc->dev->dev_private;

	return to_dpu_kms(priv->kms);
}

static struct drm_encoder *get_encoder_from_crtc(struct drm_crtc *crtc)
{
	struct drm_device *dev = crtc->dev;
	struct drm_encoder *encoder;

	drm_for_each_encoder(encoder, dev)
		if (encoder->crtc == crtc)
			return encoder;

	return NULL;
}

static enum dpu_crtc_crc_source dpu_crtc_parse_crc_source(const char *src_name)
{
	if (!src_name ||
	    !strcmp(src_name, "none"))
		return DPU_CRTC_CRC_SOURCE_NONE;
	if (!strcmp(src_name, "auto") ||
	    !strcmp(src_name, "lm"))
		return DPU_CRTC_CRC_SOURCE_LAYER_MIXER;
	if (!strcmp(src_name, "encoder"))
		return DPU_CRTC_CRC_SOURCE_ENCODER;

	return DPU_CRTC_CRC_SOURCE_INVALID;
}

static int dpu_crtc_verify_crc_source(struct drm_crtc *crtc,
		const char *src_name, size_t *values_cnt)
{
	enum dpu_crtc_crc_source source = dpu_crtc_parse_crc_source(src_name);
	struct dpu_crtc_state *crtc_state = to_dpu_crtc_state(crtc->state);

	if (source < 0) {
		DRM_DEBUG_DRIVER("Invalid source %s for CRTC%d\n", src_name, crtc->index);
		return -EINVAL;
	}

	if (source == DPU_CRTC_CRC_SOURCE_LAYER_MIXER) {
		*values_cnt = crtc_state->num_mixers;
	} else if (source == DPU_CRTC_CRC_SOURCE_ENCODER) {
		struct drm_encoder *drm_enc;

		*values_cnt = 0;

		drm_for_each_encoder_mask(drm_enc, crtc->dev, crtc->state->encoder_mask)
			*values_cnt += dpu_encoder_get_crc_values_cnt(drm_enc);
	}

	return 0;
}

static void dpu_crtc_setup_lm_misr(struct dpu_crtc_state *crtc_state)
{
	struct dpu_crtc_mixer *m;
	int i;

	for (i = 0; i < crtc_state->num_mixers; ++i) {
		m = &crtc_state->mixers[i];

		if (!m->hw_lm || !m->hw_lm->ops.setup_misr)
			continue;

		/* Calculate MISR over 1 frame */
		m->hw_lm->ops.setup_misr(m->hw_lm);
	}
}

static void dpu_crtc_setup_encoder_misr(struct drm_crtc *crtc)
{
	struct drm_encoder *drm_enc;

	drm_for_each_encoder_mask(drm_enc, crtc->dev, crtc->state->encoder_mask)
		dpu_encoder_setup_misr(drm_enc);
}

static int dpu_crtc_set_crc_source(struct drm_crtc *crtc, const char *src_name)
{
	enum dpu_crtc_crc_source source = dpu_crtc_parse_crc_source(src_name);
	enum dpu_crtc_crc_source current_source;
	struct dpu_crtc_state *crtc_state;
	struct drm_device *drm_dev = crtc->dev;

	bool was_enabled;
	bool enable = false;
	int ret = 0;

	if (source < 0) {
		DRM_DEBUG_DRIVER("Invalid CRC source %s for CRTC%d\n", src_name, crtc->index);
		return -EINVAL;
	}

	ret = drm_modeset_lock(&crtc->mutex, NULL);

	if (ret)
		return ret;

	enable = (source != DPU_CRTC_CRC_SOURCE_NONE);
	crtc_state = to_dpu_crtc_state(crtc->state);

	spin_lock_irq(&drm_dev->event_lock);
	current_source = crtc_state->crc_source;
	spin_unlock_irq(&drm_dev->event_lock);

	was_enabled = (current_source != DPU_CRTC_CRC_SOURCE_NONE);

	if (!was_enabled && enable) {
		ret = drm_crtc_vblank_get(crtc);

		if (ret)
			goto cleanup;

	} else if (was_enabled && !enable) {
		drm_crtc_vblank_put(crtc);
	}

	spin_lock_irq(&drm_dev->event_lock);
	crtc_state->crc_source = source;
	spin_unlock_irq(&drm_dev->event_lock);

	crtc_state->crc_frame_skip_count = 0;

	if (source == DPU_CRTC_CRC_SOURCE_LAYER_MIXER)
		dpu_crtc_setup_lm_misr(crtc_state);
	else if (source == DPU_CRTC_CRC_SOURCE_ENCODER)
		dpu_crtc_setup_encoder_misr(crtc);
	else
		ret = -EINVAL;

cleanup:
	drm_modeset_unlock(&crtc->mutex);

	return ret;
}

static u32 dpu_crtc_get_vblank_counter(struct drm_crtc *crtc)
{
	struct drm_encoder *encoder = get_encoder_from_crtc(crtc);
	if (!encoder) {
		DRM_ERROR("no encoder found for crtc %d\n", crtc->index);
		return 0;
	}

	return dpu_encoder_get_vsync_count(encoder);
}

static int dpu_crtc_get_lm_crc(struct drm_crtc *crtc,
		struct dpu_crtc_state *crtc_state)
{
	struct dpu_crtc_mixer *m;
	u32 crcs[CRTC_DUAL_MIXERS];

	int rc = 0;
	int i;

	BUILD_BUG_ON(ARRAY_SIZE(crcs) != ARRAY_SIZE(crtc_state->mixers));

	for (i = 0; i < crtc_state->num_mixers; ++i) {

		m = &crtc_state->mixers[i];

		if (!m->hw_lm || !m->hw_lm->ops.collect_misr)
			continue;

		rc = m->hw_lm->ops.collect_misr(m->hw_lm, &crcs[i]);

		if (rc) {
			if (rc != -ENODATA)
				DRM_DEBUG_DRIVER("MISR read failed\n");
			return rc;
		}
	}

	return drm_crtc_add_crc_entry(crtc, true,
			drm_crtc_accurate_vblank_count(crtc), crcs);
}

static int dpu_crtc_get_encoder_crc(struct drm_crtc *crtc)
{
	struct drm_encoder *drm_enc;
	int rc, pos = 0;
	u32 crcs[INTF_MAX];

	drm_for_each_encoder_mask(drm_enc, crtc->dev, crtc->state->encoder_mask) {
		rc = dpu_encoder_get_crc(drm_enc, crcs, pos);
		if (rc < 0) {
			if (rc != -ENODATA)
				DRM_DEBUG_DRIVER("MISR read failed\n");

			return rc;
		}

		pos += rc;
	}

	return drm_crtc_add_crc_entry(crtc, true,
			drm_crtc_accurate_vblank_count(crtc), crcs);
}

static int dpu_crtc_get_crc(struct drm_crtc *crtc)
{
	struct dpu_crtc_state *crtc_state = to_dpu_crtc_state(crtc->state);

	/* Skip first 2 frames in case of "uncooked" CRCs */
	if (crtc_state->crc_frame_skip_count < 2) {
		crtc_state->crc_frame_skip_count++;
		return 0;
	}

	if (crtc_state->crc_source == DPU_CRTC_CRC_SOURCE_LAYER_MIXER)
		return dpu_crtc_get_lm_crc(crtc, crtc_state);
	else if (crtc_state->crc_source == DPU_CRTC_CRC_SOURCE_ENCODER)
		return dpu_crtc_get_encoder_crc(crtc);

	return -EINVAL;
}

static bool dpu_crtc_get_scanout_position(struct drm_crtc *crtc,
					   bool in_vblank_irq,
					   int *vpos, int *hpos,
					   ktime_t *stime, ktime_t *etime,
					   const struct drm_display_mode *mode)
{
	unsigned int pipe = crtc->index;
	struct drm_encoder *encoder;
	int line, vsw, vbp, vactive_start, vactive_end, vfp_end;

	encoder = get_encoder_from_crtc(crtc);
	if (!encoder) {
		DRM_ERROR("no encoder found for crtc %d\n", pipe);
		return false;
	}

	vsw = mode->crtc_vsync_end - mode->crtc_vsync_start;
	vbp = mode->crtc_vtotal - mode->crtc_vsync_end;

	/*
	 * the line counter is 1 at the start of the VSYNC pulse and VTOTAL at
	 * the end of VFP. Translate the porch values relative to the line
	 * counter positions.
	 */

	vactive_start = vsw + vbp + 1;
	vactive_end = vactive_start + mode->crtc_vdisplay;

	/* last scan line before VSYNC */
	vfp_end = mode->crtc_vtotal;

	if (stime)
		*stime = ktime_get();

	line = dpu_encoder_get_linecount(encoder);

	if (line < vactive_start)
		line -= vactive_start;
	else if (line > vactive_end)
		line = line - vfp_end - vactive_start;
	else
		line -= vactive_start;

	*vpos = line;
	*hpos = 0;

	if (etime)
		*etime = ktime_get();

	return true;
}

static void _dpu_crtc_setup_blend_cfg(struct dpu_crtc_mixer *mixer,
				      struct dpu_plane_state *pstate,
				      const struct msm_format *format,
				      const struct dpu_mdss_version *mdss_ver)
{
	struct dpu_hw_mixer *lm = mixer->hw_lm;
	u32 blend_op;
	u32 fg_alpha, bg_alpha, max_alpha;

	if (mdss_ver->core_major_ver < 12) {
		max_alpha = 0xff;
		fg_alpha = pstate->base.alpha >> 8;
	} else {
		max_alpha = 0x3ff;
		fg_alpha = pstate->base.alpha >> 6;
	}
	bg_alpha = max_alpha - fg_alpha;

	/* default to opaque blending */
	if (pstate->base.pixel_blend_mode == DRM_MODE_BLEND_PIXEL_NONE ||
	    !format->alpha_enable) {
		blend_op = DPU_BLEND_FG_ALPHA_FG_CONST |
			DPU_BLEND_BG_ALPHA_BG_CONST;
	} else if (pstate->base.pixel_blend_mode == DRM_MODE_BLEND_PREMULTI) {
		blend_op = DPU_BLEND_FG_ALPHA_FG_CONST |
			DPU_BLEND_BG_ALPHA_FG_PIXEL;
		if (fg_alpha != max_alpha) {
			bg_alpha = fg_alpha;
			blend_op |= DPU_BLEND_BG_MOD_ALPHA |
				    DPU_BLEND_BG_INV_MOD_ALPHA;
		} else {
			blend_op |= DPU_BLEND_BG_INV_ALPHA;
		}
	} else {
		/* coverage blending */
		blend_op = DPU_BLEND_FG_ALPHA_FG_PIXEL |
			DPU_BLEND_BG_ALPHA_FG_PIXEL;
		if (fg_alpha != max_alpha) {
			bg_alpha = fg_alpha;
			blend_op |= DPU_BLEND_FG_MOD_ALPHA |
				    DPU_BLEND_FG_INV_MOD_ALPHA |
				    DPU_BLEND_BG_MOD_ALPHA |
				    DPU_BLEND_BG_INV_MOD_ALPHA;
		} else {
			blend_op |= DPU_BLEND_BG_INV_ALPHA;
		}
	}

	lm->ops.setup_blend_config(lm, pstate->stage,
				fg_alpha, bg_alpha, blend_op);

	DRM_DEBUG_ATOMIC("format:%p4cc, alpha_en:%u blend_op:0x%x\n",
		  &format->pixel_format, format->alpha_enable, blend_op);
}

static void _dpu_crtc_program_lm_output_roi(struct drm_crtc *crtc)
{
	struct dpu_crtc_state *crtc_state;
	int lm_idx, lm_horiz_position;

	crtc_state = to_dpu_crtc_state(crtc->state);

	lm_horiz_position = 0;
	for (lm_idx = 0; lm_idx < crtc_state->num_mixers; lm_idx++) {
		const struct drm_rect *lm_roi = &crtc_state->lm_bounds[lm_idx];
		struct dpu_hw_mixer *hw_lm = crtc_state->mixers[lm_idx].hw_lm;
		struct dpu_hw_mixer_cfg cfg;

		if (!lm_roi || !drm_rect_visible(lm_roi))
			continue;

		cfg.out_width = drm_rect_width(lm_roi);
		cfg.out_height = drm_rect_height(lm_roi);
		cfg.right_mixer = lm_horiz_position++;
		cfg.flags = 0;
		hw_lm->ops.setup_mixer_out(hw_lm, &cfg);
	}
}

static void _dpu_crtc_blend_setup_pipe(struct drm_crtc *crtc,
				       struct drm_plane *plane,
				       struct dpu_crtc_mixer *mixer,
				       u32 num_mixers,
				       enum dpu_stage stage,
				       const struct msm_format *format,
				       uint64_t modifier,
				       struct dpu_sw_pipe *pipe,
				       unsigned int stage_idx,
				       struct dpu_hw_stage_cfg *stage_cfg
				      )
{
	u32 lm_idx;
	enum dpu_sspp sspp_idx;
	struct drm_plane_state *state;

	sspp_idx = pipe->sspp->idx;

	state = plane->state;

	trace_dpu_crtc_setup_mixer(DRMID(crtc), DRMID(plane),
				   state, to_dpu_plane_state(state), stage_idx,
				   format->pixel_format,
				   modifier);

	DRM_DEBUG_ATOMIC("crtc %d stage:%d - plane %d sspp %d fb %d multirect_idx %d\n",
			 crtc->base.id,
			 stage,
			 plane->base.id,
			 sspp_idx - SSPP_NONE,
			 state->fb ? state->fb->base.id : -1,
			 pipe->multirect_index);

	stage_cfg->stage[stage][stage_idx] = sspp_idx;
	stage_cfg->multirect_index[stage][stage_idx] = pipe->multirect_index;

	/* blend config update */
	for (lm_idx = 0; lm_idx < num_mixers; lm_idx++)
		mixer[lm_idx].lm_ctl->ops.update_pending_flush_sspp(mixer[lm_idx].lm_ctl, sspp_idx);
}

static void _dpu_crtc_blend_setup_mixer(struct drm_crtc *crtc,
	struct dpu_crtc *dpu_crtc, struct dpu_crtc_mixer *mixer,
	struct dpu_hw_stage_cfg *stage_cfg)
{
	struct drm_plane *plane;
	struct drm_framebuffer *fb;
	struct drm_plane_state *state;
	struct dpu_crtc_state *cstate = to_dpu_crtc_state(crtc->state);
	struct dpu_plane_state *pstate = NULL;
	const struct msm_format *format;
	struct dpu_hw_ctl *ctl = mixer->lm_ctl;
	u32 lm_idx;
	bool bg_alpha_enable = false;
	DECLARE_BITMAP(active_fetch, SSPP_MAX);
	DECLARE_BITMAP(active_pipes, SSPP_MAX);

	memset(active_fetch, 0, sizeof(active_fetch));
	memset(active_pipes, 0, sizeof(active_pipes));
	drm_atomic_crtc_for_each_plane(plane, crtc) {
		state = plane->state;
		if (!state)
			continue;

		if (!state->visible)
			continue;

		pstate = to_dpu_plane_state(state);
		fb = state->fb;

		format = msm_framebuffer_format(pstate->base.fb);

		if (pstate->stage == DPU_STAGE_BASE && format->alpha_enable)
			bg_alpha_enable = true;

		set_bit(pstate->pipe.sspp->idx, active_fetch);
		set_bit(pstate->pipe.sspp->idx, active_pipes);
		_dpu_crtc_blend_setup_pipe(crtc, plane,
					   mixer, cstate->num_mixers,
					   pstate->stage,
					   format, fb ? fb->modifier : 0,
					   &pstate->pipe, 0, stage_cfg);

		if (pstate->r_pipe.sspp) {
			set_bit(pstate->r_pipe.sspp->idx, active_fetch);
			set_bit(pstate->r_pipe.sspp->idx, active_pipes);
			_dpu_crtc_blend_setup_pipe(crtc, plane,
						   mixer, cstate->num_mixers,
						   pstate->stage,
						   format, fb ? fb->modifier : 0,
						   &pstate->r_pipe, 1, stage_cfg);
		}

		/* blend config update */
		for (lm_idx = 0; lm_idx < cstate->num_mixers; lm_idx++) {
			_dpu_crtc_setup_blend_cfg(mixer + lm_idx, pstate, format,
						  ctl->mdss_ver);

			if (bg_alpha_enable && !format->alpha_enable)
				mixer[lm_idx].mixer_op_mode = 0;
			else
				mixer[lm_idx].mixer_op_mode |=
						1 << pstate->stage;
		}
	}

	if (ctl->ops.set_active_fetch_pipes)
		ctl->ops.set_active_fetch_pipes(ctl, active_fetch);

	if (ctl->ops.set_active_pipes)
		ctl->ops.set_active_pipes(ctl, active_pipes);

	_dpu_crtc_program_lm_output_roi(crtc);
}

/**
 * _dpu_crtc_blend_setup - configure crtc mixers
 * @crtc: Pointer to drm crtc structure
 */
static void _dpu_crtc_blend_setup(struct drm_crtc *crtc)
{
	struct dpu_crtc *dpu_crtc = to_dpu_crtc(crtc);
	struct dpu_crtc_state *cstate = to_dpu_crtc_state(crtc->state);
	struct dpu_crtc_mixer *mixer = cstate->mixers;
	struct dpu_hw_ctl *ctl;
	struct dpu_hw_mixer *lm;
	struct dpu_hw_stage_cfg stage_cfg;
	DECLARE_BITMAP(active_lms, LM_MAX);
	int i;

	DRM_DEBUG_ATOMIC("%s\n", dpu_crtc->name);

	for (i = 0; i < cstate->num_mixers; i++) {
		mixer[i].mixer_op_mode = 0;
		if (mixer[i].lm_ctl->ops.clear_all_blendstages)
			mixer[i].lm_ctl->ops.clear_all_blendstages(
					mixer[i].lm_ctl);
		if (mixer[i].lm_ctl->ops.set_active_fetch_pipes)
			mixer[i].lm_ctl->ops.set_active_fetch_pipes(mixer[i].lm_ctl, NULL);
		if (mixer[i].lm_ctl->ops.set_active_pipes)
			mixer[i].lm_ctl->ops.set_active_pipes(mixer[i].lm_ctl, NULL);

		if (mixer[i].hw_lm->ops.clear_all_blendstages)
			mixer[i].hw_lm->ops.clear_all_blendstages(mixer[i].hw_lm);
	}

	/* initialize stage cfg */
	memset(&stage_cfg, 0, sizeof(struct dpu_hw_stage_cfg));
	memset(active_lms, 0, sizeof(active_lms));

	_dpu_crtc_blend_setup_mixer(crtc, dpu_crtc, mixer, &stage_cfg);

	for (i = 0; i < cstate->num_mixers; i++) {
		ctl = mixer[i].lm_ctl;
		lm = mixer[i].hw_lm;

		lm->ops.setup_alpha_out(lm, mixer[i].mixer_op_mode);

		/* stage config flush mask */
		ctl->ops.update_pending_flush_mixer(ctl,
			mixer[i].hw_lm->idx);

		set_bit(lm->idx, active_lms);
		if (ctl->ops.set_active_lms)
			ctl->ops.set_active_lms(ctl, active_lms);

		DRM_DEBUG_ATOMIC("lm %d, op_mode 0x%X, ctl %d\n",
			mixer[i].hw_lm->idx - LM_0,
			mixer[i].mixer_op_mode,
			ctl->idx - CTL_0);

		if (ctl->ops.setup_blendstage)
			ctl->ops.setup_blendstage(ctl, mixer[i].hw_lm->idx,
						  &stage_cfg);

		if (lm->ops.setup_blendstage)
			lm->ops.setup_blendstage(lm, mixer[i].hw_lm->idx,
						 &stage_cfg);
	}
}

/**
 *  _dpu_crtc_complete_flip - signal pending page_flip events
 * Any pending vblank events are added to the vblank_event_list
 * so that the next vblank interrupt shall signal them.
 * However PAGE_FLIP events are not handled through the vblank_event_list.
 * This API signals any pending PAGE_FLIP events requested through
 * DRM_IOCTL_MODE_PAGE_FLIP and are cached in the dpu_crtc->event.
 * @crtc: Pointer to drm crtc structure
 */
static void _dpu_crtc_complete_flip(struct drm_crtc *crtc)
{
	struct dpu_crtc *dpu_crtc = to_dpu_crtc(crtc);
	struct drm_device *dev = crtc->dev;
	unsigned long flags;

	spin_lock_irqsave(&dev->event_lock, flags);
	if (dpu_crtc->event) {
		DRM_DEBUG_VBL("%s: send event: %pK\n", dpu_crtc->name,
			      dpu_crtc->event);
		trace_dpu_crtc_complete_flip(DRMID(crtc));
		drm_crtc_send_vblank_event(crtc, dpu_crtc->event);
		dpu_crtc->event = NULL;
	}
	spin_unlock_irqrestore(&dev->event_lock, flags);
}

/**
 * dpu_crtc_get_intf_mode - get interface mode of the given crtc
 * @crtc: Pointert to crtc
 */
enum dpu_intf_mode dpu_crtc_get_intf_mode(struct drm_crtc *crtc)
{
	struct drm_encoder *encoder;

	/*
	 * TODO: This function is called from dpu debugfs and as part of atomic
	 * check. When called from debugfs, the crtc->mutex must be held to
	 * read crtc->state. However reading crtc->state from atomic check isn't
	 * allowed (unless you have a good reason, a big comment, and a deep
	 * understanding of how the atomic/modeset locks work (<- and this is
	 * probably not possible)). So we'll keep the WARN_ON here for now, but
	 * really we need to figure out a better way to track our operating mode
	 */
	WARN_ON(!drm_modeset_is_locked(&crtc->mutex));

	/* TODO: Returns the first INTF_MODE, could there be multiple values? */
	drm_for_each_encoder_mask(encoder, crtc->dev, crtc->state->encoder_mask)
		return dpu_encoder_get_intf_mode(encoder);

	return INTF_MODE_NONE;
}

/**
 * dpu_crtc_vblank_callback - called on vblank irq, issues completion events
 * @crtc: Pointer to drm crtc object
 */
void dpu_crtc_vblank_callback(struct drm_crtc *crtc)
{
	struct dpu_crtc *dpu_crtc = to_dpu_crtc(crtc);

	/* keep statistics on vblank callback - with auto reset via debugfs */
	if (ktime_compare(dpu_crtc->vblank_cb_time, ktime_set(0, 0)) == 0)
		dpu_crtc->vblank_cb_time = ktime_get();
	else
		dpu_crtc->vblank_cb_count++;

	dpu_crtc_get_crc(crtc);

	drm_crtc_handle_vblank(crtc);
	trace_dpu_crtc_vblank_cb(DRMID(crtc));
}

static void dpu_crtc_frame_event_work(struct kthread_work *work)
{
	struct dpu_crtc_frame_event *fevent = container_of(work,
			struct dpu_crtc_frame_event, work);
	struct drm_crtc *crtc = fevent->crtc;
	struct dpu_crtc *dpu_crtc = to_dpu_crtc(crtc);
	unsigned long flags;
	bool frame_done = false;

	DPU_ATRACE_BEGIN("crtc_frame_event");

	DRM_DEBUG_ATOMIC("crtc%d event:%u ts:%lld\n", crtc->base.id, fevent->event,
			ktime_to_ns(fevent->ts));

	if (fevent->event & (DPU_ENCODER_FRAME_EVENT_DONE
				| DPU_ENCODER_FRAME_EVENT_ERROR
				| DPU_ENCODER_FRAME_EVENT_PANEL_DEAD)) {

		if (atomic_read(&dpu_crtc->frame_pending) < 1) {
			/* ignore vblank when not pending */
		} else if (atomic_dec_return(&dpu_crtc->frame_pending) == 0) {
			/* release bandwidth and other resources */
			trace_dpu_crtc_frame_event_done(DRMID(crtc),
							fevent->event);
			dpu_core_perf_crtc_release_bw(crtc);
		} else {
			trace_dpu_crtc_frame_event_more_pending(DRMID(crtc),
								fevent->event);
		}

		if (fevent->event & (DPU_ENCODER_FRAME_EVENT_DONE
					| DPU_ENCODER_FRAME_EVENT_ERROR))
			frame_done = true;
	}

	if (fevent->event & DPU_ENCODER_FRAME_EVENT_PANEL_DEAD)
		DPU_ERROR("crtc%d ts:%lld received panel dead event\n",
				crtc->base.id, ktime_to_ns(fevent->ts));

	if (frame_done)
		complete_all(&dpu_crtc->frame_done_comp);

	spin_lock_irqsave(&dpu_crtc->spin_lock, flags);
	list_add_tail(&fevent->list, &dpu_crtc->frame_event_list);
	spin_unlock_irqrestore(&dpu_crtc->spin_lock, flags);
	DPU_ATRACE_END("crtc_frame_event");
}

/**
 * dpu_crtc_frame_event_cb - crtc frame event callback API
 * @crtc: Pointer to crtc
 * @event: Event to process
 *
 * Encoder may call this for different events from different context - IRQ,
 * user thread, commit_thread, etc. Each event should be carefully reviewed and
 * should be processed in proper task context to avoid schedulin delay or
 * properly manage the irq context's bottom half processing.
 */
void dpu_crtc_frame_event_cb(struct drm_crtc *crtc, u32 event)
{
	struct dpu_crtc *dpu_crtc;
	struct msm_drm_private *priv;
	struct dpu_crtc_frame_event *fevent;
	unsigned long flags;
	u32 crtc_id;

	/* Nothing to do on idle event */
	if (event & DPU_ENCODER_FRAME_EVENT_IDLE)
		return;

	dpu_crtc = to_dpu_crtc(crtc);
	priv = crtc->dev->dev_private;
	crtc_id = drm_crtc_index(crtc);

	trace_dpu_crtc_frame_event_cb(DRMID(crtc), event);

	spin_lock_irqsave(&dpu_crtc->spin_lock, flags);
	fevent = list_first_entry_or_null(&dpu_crtc->frame_event_list,
			struct dpu_crtc_frame_event, list);
	if (fevent)
		list_del_init(&fevent->list);
	spin_unlock_irqrestore(&dpu_crtc->spin_lock, flags);

	if (!fevent) {
		DRM_ERROR_RATELIMITED("crtc%d event %d overflow\n", crtc->base.id, event);
		return;
	}

	fevent->event = event;
	fevent->crtc = crtc;
	fevent->ts = ktime_get();
	kthread_queue_work(priv->kms->event_thread[crtc_id].worker, &fevent->work);
}

/**
 * dpu_crtc_complete_commit - callback signalling completion of current commit
 * @crtc: Pointer to drm crtc object
 */
void dpu_crtc_complete_commit(struct drm_crtc *crtc)
{
	trace_dpu_crtc_complete_commit(DRMID(crtc));
	dpu_core_perf_crtc_update(crtc, 0);
	_dpu_crtc_complete_flip(crtc);
}

static int _dpu_crtc_check_and_setup_lm_bounds(struct drm_crtc *crtc,
		struct drm_crtc_state *state)
{
	struct dpu_crtc_state *cstate = to_dpu_crtc_state(state);
	struct drm_display_mode *adj_mode = &state->adjusted_mode;
	u32 crtc_split_width = adj_mode->hdisplay / cstate->num_mixers;
	struct dpu_kms *dpu_kms = _dpu_crtc_get_kms(crtc);
	int i;

	/* if we cannot merge 2 LMs (no 3d mux) better to fail earlier
	 * before even checking the width after the split
	 */
	if (!dpu_kms->catalog->caps->has_3d_merge &&
	    adj_mode->hdisplay > dpu_kms->catalog->caps->max_mixer_width)
		return -E2BIG;

	for (i = 0; i < cstate->num_mixers; i++) {
		struct drm_rect *r = &cstate->lm_bounds[i];
		r->x1 = crtc_split_width * i;
		r->y1 = 0;
		r->x2 = r->x1 + crtc_split_width;
		r->y2 = adj_mode->vdisplay;

		trace_dpu_crtc_setup_lm_bounds(DRMID(crtc), i, r);

		if (drm_rect_width(r) > dpu_kms->catalog->caps->max_mixer_width)
			return -E2BIG;
	}

	return 0;
}

static void _dpu_crtc_get_pcc_coeff(struct drm_crtc_state *state,
		struct dpu_hw_pcc_cfg *cfg)
{
	struct drm_color_ctm *ctm;

	memset(cfg, 0, sizeof(struct dpu_hw_pcc_cfg));

	ctm = (struct drm_color_ctm *)state->ctm->data;

	if (!ctm)
		return;

	cfg->r.r = CONVERT_S3_15(ctm->matrix[0]);
	cfg->g.r = CONVERT_S3_15(ctm->matrix[1]);
	cfg->b.r = CONVERT_S3_15(ctm->matrix[2]);

	cfg->r.g = CONVERT_S3_15(ctm->matrix[3]);
	cfg->g.g = CONVERT_S3_15(ctm->matrix[4]);
	cfg->b.g = CONVERT_S3_15(ctm->matrix[5]);

	cfg->r.b = CONVERT_S3_15(ctm->matrix[6]);
	cfg->g.b = CONVERT_S3_15(ctm->matrix[7]);
	cfg->b.b = CONVERT_S3_15(ctm->matrix[8]);
}

static void _dpu_crtc_setup_cp_blocks(struct drm_crtc *crtc)
{
	struct drm_crtc_state *state = crtc->state;
	struct dpu_crtc_state *cstate = to_dpu_crtc_state(crtc->state);
	struct dpu_crtc_mixer *mixer = cstate->mixers;
	struct dpu_hw_pcc_cfg cfg;
	struct dpu_hw_ctl *ctl;
	struct dpu_hw_dspp *dspp;
	int i;


	if (!state->color_mgmt_changed && !drm_atomic_crtc_needs_modeset(state))
		return;

	for (i = 0; i < cstate->num_mixers; i++) {
		ctl = mixer[i].lm_ctl;
		dspp = mixer[i].hw_dspp;

		if (!dspp || !dspp->ops.setup_pcc)
			continue;

		if (!state->ctm) {
			dspp->ops.setup_pcc(dspp, NULL);
		} else {
			_dpu_crtc_get_pcc_coeff(state, &cfg);
			dspp->ops.setup_pcc(dspp, &cfg);
		}

		/* stage config flush mask */
		ctl->ops.update_pending_flush_dspp(ctl,
			mixer[i].hw_dspp->idx, DPU_DSPP_PCC);
	}
}

static void dpu_crtc_atomic_begin(struct drm_crtc *crtc,
		struct drm_atomic_state *state)
{
	struct dpu_crtc_state *cstate = to_dpu_crtc_state(crtc->state);
	struct drm_encoder *encoder;

	if (!crtc->state->enable) {
		DRM_DEBUG_ATOMIC("crtc%d -> enable %d, skip atomic_begin\n",
				crtc->base.id, crtc->state->enable);
		return;
	}

	DRM_DEBUG_ATOMIC("crtc%d\n", crtc->base.id);

	_dpu_crtc_check_and_setup_lm_bounds(crtc, crtc->state);

	/* encoder will trigger pending mask now */
	drm_for_each_encoder_mask(encoder, crtc->dev, crtc->state->encoder_mask)
		dpu_encoder_trigger_kickoff_pending(encoder);

	/*
	 * If no mixers have been allocated in dpu_crtc_atomic_check(),
	 * it means we are trying to flush a CRTC whose state is disabled:
	 * nothing else needs to be done.
	 */
	if (unlikely(!cstate->num_mixers))
		return;

	_dpu_crtc_blend_setup(crtc);

	_dpu_crtc_setup_cp_blocks(crtc);

	/*
	 * PP_DONE irq is only used by command mode for now.
	 * It is better to request pending before FLUSH and START trigger
	 * to make sure no pp_done irq missed.
	 * This is safe because no pp_done will happen before SW trigger
	 * in command mode.
	 */
}

static void dpu_crtc_atomic_flush(struct drm_crtc *crtc,
		struct drm_atomic_state *state)
{
	struct dpu_crtc *dpu_crtc;
	struct drm_device *dev;
	struct drm_plane *plane;
	struct msm_drm_private *priv;
	unsigned long flags;
	struct dpu_crtc_state *cstate;

	if (!crtc->state->enable) {
		DRM_DEBUG_ATOMIC("crtc%d -> enable %d, skip atomic_flush\n",
				crtc->base.id, crtc->state->enable);
		return;
	}

	DRM_DEBUG_ATOMIC("crtc%d\n", crtc->base.id);

	dpu_crtc = to_dpu_crtc(crtc);
	cstate = to_dpu_crtc_state(crtc->state);
	dev = crtc->dev;
	priv = dev->dev_private;

	if (crtc->index >= ARRAY_SIZE(priv->kms->event_thread)) {
		DPU_ERROR("invalid crtc index[%d]\n", crtc->index);
		return;
	}

	WARN_ON(dpu_crtc->event);
	spin_lock_irqsave(&dev->event_lock, flags);
	dpu_crtc->event = crtc->state->event;
	crtc->state->event = NULL;
	spin_unlock_irqrestore(&dev->event_lock, flags);

	/*
	 * If no mixers has been allocated in dpu_crtc_atomic_check(),
	 * it means we are trying to flush a CRTC whose state is disabled:
	 * nothing else needs to be done.
	 */
	if (unlikely(!cstate->num_mixers))
		return;

	/* update performance setting before crtc kickoff */
	dpu_core_perf_crtc_update(crtc, 1);

	/*
	 * Final plane updates: Give each plane a chance to complete all
	 *                      required writes/flushing before crtc's "flush
	 *                      everything" call below.
	 */
	drm_atomic_crtc_for_each_plane(plane, crtc) {
		if (dpu_crtc->smmu_state.transition_error)
			dpu_plane_set_error(plane, true);
		dpu_plane_flush(plane);
	}

	/* Kickoff will be scheduled by outer layer */
}

/**
 * dpu_crtc_destroy_state - state destroy hook
 * @crtc: drm CRTC
 * @state: CRTC state object to release
 */
static void dpu_crtc_destroy_state(struct drm_crtc *crtc,
		struct drm_crtc_state *state)
{
	struct dpu_crtc_state *cstate = to_dpu_crtc_state(state);

	DRM_DEBUG_ATOMIC("crtc%d\n", crtc->base.id);

	__drm_atomic_helper_crtc_destroy_state(state);

	kfree(cstate);
}

static int _dpu_crtc_wait_for_frame_done(struct drm_crtc *crtc)
{
	struct dpu_crtc *dpu_crtc = to_dpu_crtc(crtc);
	int ret, rc = 0;

	if (!atomic_read(&dpu_crtc->frame_pending)) {
		DRM_DEBUG_ATOMIC("no frames pending\n");
		return 0;
	}

	DPU_ATRACE_BEGIN("frame done completion wait");
	ret = wait_for_completion_timeout(&dpu_crtc->frame_done_comp,
			msecs_to_jiffies(DPU_CRTC_FRAME_DONE_TIMEOUT_MS));
	if (!ret) {
		DRM_ERROR("frame done wait timed out, ret:%d\n", ret);
		rc = -ETIMEDOUT;
	}
	DPU_ATRACE_END("frame done completion wait");

	return rc;
}

static int dpu_crtc_kickoff_clone_mode(struct drm_crtc *crtc)
{
	struct drm_encoder *encoder;
	struct drm_encoder *rt_encoder = NULL, *wb_encoder = NULL;
	struct dpu_kms *dpu_kms = _dpu_crtc_get_kms(crtc);

	/* Find encoder for real time display */
	drm_for_each_encoder_mask(encoder, crtc->dev,
				  crtc->state->encoder_mask) {
		if (encoder->encoder_type == DRM_MODE_ENCODER_VIRTUAL)
			wb_encoder = encoder;
		else
			rt_encoder = encoder;
	}

	if (!rt_encoder || !wb_encoder) {
		DRM_DEBUG_ATOMIC("real time or wb encoder not found\n");
		return -EINVAL;
	}

	dpu_encoder_prepare_for_kickoff(wb_encoder);
	dpu_encoder_prepare_for_kickoff(rt_encoder);

	dpu_vbif_clear_errors(dpu_kms);

	/*
	 * Kickoff real time encoder last as it's the encoder that
	 * will do the flush
	 */
	dpu_encoder_kickoff(wb_encoder);
	dpu_encoder_kickoff(rt_encoder);

	/* Don't start frame done timers until the kickoffs have finished */
	dpu_encoder_start_frame_done_timer(wb_encoder);
	dpu_encoder_start_frame_done_timer(rt_encoder);

	return 0;
}

/**
 * dpu_crtc_commit_kickoff - trigger kickoff of the commit for this crtc
 * @crtc: Pointer to drm crtc object
 */
void dpu_crtc_commit_kickoff(struct drm_crtc *crtc)
{
	struct drm_encoder *encoder;
	struct dpu_crtc *dpu_crtc = to_dpu_crtc(crtc);
	struct dpu_kms *dpu_kms = _dpu_crtc_get_kms(crtc);
	struct dpu_crtc_state *cstate = to_dpu_crtc_state(crtc->state);

	/*
	 * If no mixers has been allocated in dpu_crtc_atomic_check(),
	 * it means we are trying to start a CRTC whose state is disabled:
	 * nothing else needs to be done.
	 */
	if (unlikely(!cstate->num_mixers))
		return;

	DPU_ATRACE_BEGIN("crtc_commit");

	drm_for_each_encoder_mask(encoder, crtc->dev,
			crtc->state->encoder_mask) {
		if (!dpu_encoder_is_valid_for_commit(encoder)) {
			DRM_DEBUG_ATOMIC("invalid FB not kicking off crtc\n");
			goto end;
		}
	}

	if (drm_crtc_in_clone_mode(crtc->state)) {
		if (dpu_crtc_kickoff_clone_mode(crtc))
			goto end;
	} else {
		/*
		 * Encoder will flush/start now, unless it has a tx pending.
		 * If so, it may delay and flush at an irq event (e.g. ppdone)
		 */
		drm_for_each_encoder_mask(encoder, crtc->dev,
				crtc->state->encoder_mask)
			dpu_encoder_prepare_for_kickoff(encoder);

		dpu_vbif_clear_errors(dpu_kms);

		drm_for_each_encoder_mask(encoder, crtc->dev,
				crtc->state->encoder_mask) {
			dpu_encoder_kickoff(encoder);
			dpu_encoder_start_frame_done_timer(encoder);
		}
	}

	if (atomic_inc_return(&dpu_crtc->frame_pending) == 1) {
		/* acquire bandwidth and other resources */
		DRM_DEBUG_ATOMIC("crtc%d first commit\n", crtc->base.id);
	} else
		DRM_DEBUG_ATOMIC("crtc%d commit\n", crtc->base.id);

	dpu_crtc->play_count++;

	reinit_completion(&dpu_crtc->frame_done_comp);

end:
	DPU_ATRACE_END("crtc_commit");
}

static void dpu_crtc_reset(struct drm_crtc *crtc)
{
	struct dpu_crtc_state *cstate = kzalloc(sizeof(*cstate), GFP_KERNEL);

	if (crtc->state)
		dpu_crtc_destroy_state(crtc, crtc->state);

	if (cstate)
		__drm_atomic_helper_crtc_reset(crtc, &cstate->base);
	else
		__drm_atomic_helper_crtc_reset(crtc, NULL);
}

/**
 * dpu_crtc_duplicate_state - state duplicate hook
 * @crtc: Pointer to drm crtc structure
 */
static struct drm_crtc_state *dpu_crtc_duplicate_state(struct drm_crtc *crtc)
{
	struct dpu_crtc_state *cstate, *old_cstate = to_dpu_crtc_state(crtc->state);

	cstate = kmemdup(old_cstate, sizeof(*old_cstate), GFP_KERNEL);
	if (!cstate) {
		DPU_ERROR("failed to allocate state\n");
		return NULL;
	}

	/* duplicate base helper */
	__drm_atomic_helper_crtc_duplicate_state(crtc, &cstate->base);

	return &cstate->base;
}

static void dpu_crtc_atomic_print_state(struct drm_printer *p,
					const struct drm_crtc_state *state)
{
	const struct dpu_crtc_state *cstate = to_dpu_crtc_state(state);
	int i;

	for (i = 0; i < cstate->num_mixers; i++) {
		drm_printf(p, "\tlm[%d]=%d\n", i, cstate->mixers[i].hw_lm->idx - LM_0);
		drm_printf(p, "\tctl[%d]=%d\n", i, cstate->mixers[i].lm_ctl->idx - CTL_0);
		if (cstate->mixers[i].hw_dspp)
			drm_printf(p, "\tdspp[%d]=%d\n", i, cstate->mixers[i].hw_dspp->idx - DSPP_0);
	}
}

static void dpu_crtc_disable(struct drm_crtc *crtc,
			     struct drm_atomic_state *state)
{
	struct drm_crtc_state *old_crtc_state = drm_atomic_get_old_crtc_state(state,
									      crtc);
	struct dpu_crtc *dpu_crtc = to_dpu_crtc(crtc);
	struct dpu_crtc_state *cstate = to_dpu_crtc_state(crtc->state);
	struct drm_encoder *encoder;
	unsigned long flags;
	bool release_bandwidth = false;

	DRM_DEBUG_KMS("crtc%d\n", crtc->base.id);

	/* If disable is triggered while in self refresh mode,
	 * reset the encoder software state so that in enable
	 * it won't trigger a warn while assigning crtc.
	 */
	if (old_crtc_state->self_refresh_active) {
		drm_for_each_encoder_mask(encoder, crtc->dev,
					old_crtc_state->encoder_mask) {
			dpu_encoder_assign_crtc(encoder, NULL);
		}
		return;
	}

	/* Disable/save vblank irq handling */
	drm_crtc_vblank_off(crtc);

	drm_for_each_encoder_mask(encoder, crtc->dev,
				  old_crtc_state->encoder_mask) {
		/* in video mode, we hold an extra bandwidth reference
		 * as we cannot drop bandwidth at frame-done if any
		 * crtc is being used in video mode.
		 */
		if (dpu_encoder_get_intf_mode(encoder) == INTF_MODE_VIDEO)
			release_bandwidth = true;

		/*
		 * If disable is triggered during psr active(e.g: screen dim in PSR),
		 * we will need encoder->crtc connection to process the device sleep &
		 * preserve it during psr sequence.
		 */
		if (!crtc->state->self_refresh_active)
			dpu_encoder_assign_crtc(encoder, NULL);
	}

	/* wait for frame_event_done completion */
	if (_dpu_crtc_wait_for_frame_done(crtc))
		DPU_ERROR("crtc%d wait for frame done failed;frame_pending%d\n",
				crtc->base.id,
				atomic_read(&dpu_crtc->frame_pending));

	trace_dpu_crtc_disable(DRMID(crtc), false, dpu_crtc);
	dpu_crtc->enabled = false;

	if (atomic_read(&dpu_crtc->frame_pending)) {
		trace_dpu_crtc_disable_frame_pending(DRMID(crtc),
				     atomic_read(&dpu_crtc->frame_pending));
		if (release_bandwidth)
			dpu_core_perf_crtc_release_bw(crtc);
		atomic_set(&dpu_crtc->frame_pending, 0);
	}

	dpu_core_perf_crtc_update(crtc, 0);

	/* disable clk & bw control until clk & bw properties are set */
	cstate->bw_control = false;
	cstate->bw_split_vote = false;

	if (crtc->state->event && !crtc->state->active) {
		spin_lock_irqsave(&crtc->dev->event_lock, flags);
		drm_crtc_send_vblank_event(crtc, crtc->state->event);
		crtc->state->event = NULL;
		spin_unlock_irqrestore(&crtc->dev->event_lock, flags);
	}

	pm_runtime_put_sync(crtc->dev->dev);
}

static void dpu_crtc_enable(struct drm_crtc *crtc,
		struct drm_atomic_state *state)
{
	struct dpu_crtc *dpu_crtc = to_dpu_crtc(crtc);
	struct drm_encoder *encoder;
	bool request_bandwidth = false;
	struct drm_crtc_state *old_crtc_state;

	old_crtc_state = drm_atomic_get_old_crtc_state(state, crtc);

	pm_runtime_get_sync(crtc->dev->dev);

	DRM_DEBUG_KMS("crtc%d\n", crtc->base.id);

	drm_for_each_encoder_mask(encoder, crtc->dev, crtc->state->encoder_mask) {
		/* in video mode, we hold an extra bandwidth reference
		 * as we cannot drop bandwidth at frame-done if any
		 * crtc is being used in video mode.
		 */
		if (dpu_encoder_get_intf_mode(encoder) == INTF_MODE_VIDEO)
			request_bandwidth = true;
	}

	if (request_bandwidth)
		atomic_inc(&_dpu_crtc_get_kms(crtc)->bandwidth_ref);

	trace_dpu_crtc_enable(DRMID(crtc), true, dpu_crtc);
	dpu_crtc->enabled = true;

	if (!old_crtc_state->self_refresh_active) {
		drm_for_each_encoder_mask(encoder, crtc->dev, crtc->state->encoder_mask)
			dpu_encoder_assign_crtc(encoder, crtc);
	}

	/* Enable/restore vblank irq handling */
	drm_crtc_vblank_on(crtc);
}

static bool dpu_crtc_needs_dirtyfb(struct drm_crtc_state *cstate)
{
	struct drm_crtc *crtc = cstate->crtc;
	struct drm_encoder *encoder;

	if (cstate->self_refresh_active)
		return true;

	drm_for_each_encoder_mask (encoder, crtc->dev, cstate->encoder_mask) {
		if (dpu_encoder_get_intf_mode(encoder) == INTF_MODE_CMD) {
			return true;
		}
	}

	return false;
}

static int dpu_crtc_reassign_planes(struct drm_crtc *crtc, struct drm_crtc_state *crtc_state)
{
	int total_planes = crtc->dev->mode_config.num_total_plane;
	struct drm_atomic_state *state = crtc_state->state;
	struct dpu_global_state *global_state;
	struct drm_plane_state **states;
	struct drm_plane *plane;
	int ret;

	global_state = dpu_kms_get_global_state(crtc_state->state);
	if (IS_ERR(global_state))
		return PTR_ERR(global_state);

	dpu_rm_release_all_sspp(global_state, crtc);

	if (!crtc_state->enable)
		return 0;

	states = kcalloc(total_planes, sizeof(*states), GFP_KERNEL);
	if (!states)
		return -ENOMEM;

	drm_atomic_crtc_state_for_each_plane(plane, crtc_state) {
		struct drm_plane_state *plane_state =
			drm_atomic_get_plane_state(state, plane);

		if (IS_ERR(plane_state)) {
			ret = PTR_ERR(plane_state);
			goto done;
		}

		states[plane_state->normalized_zpos] = plane_state;
	}

	ret = dpu_assign_plane_resources(global_state, state, crtc, states, total_planes);

done:
	kfree(states);
	return ret;
}

#define MAX_CHANNELS_PER_CRTC 2
#define MAX_HDISPLAY_SPLIT 1080

static struct msm_display_topology dpu_crtc_get_topology(
		struct drm_crtc *crtc,
		struct dpu_kms *dpu_kms,
		struct drm_crtc_state *crtc_state)
{
	struct drm_display_mode *mode = &crtc_state->adjusted_mode;
	struct msm_display_topology topology = {0};
	struct drm_encoder *drm_enc;

	drm_for_each_encoder_mask(drm_enc, crtc->dev, crtc_state->encoder_mask)
		dpu_encoder_update_topology(drm_enc, &topology, crtc_state->state,
					    &crtc_state->adjusted_mode);

	topology.cwb_enabled = drm_crtc_in_clone_mode(crtc_state);

	/*
	 * Datapath topology selection
	 *
	 * Dual display
	 * 2 LM, 2 INTF ( Split display using 2 interfaces)
	 *
	 * Single display
	 * 1 LM, 1 INTF
	 * 2 LM, 1 INTF (stream merge to support high resolution interfaces)
	 *
	 * If DSC is enabled, use 2 LMs for 2:2:1 topology
	 *
	 * Add dspps to the reservation requirements if ctm is requested
	 *
	 * Only hardcode num_lm to 2 for cases where num_intf == 2 and CWB is not
	 * enabled. This is because in cases where CWB is enabled, num_intf will
	 * count both the WB and real-time phys encoders.
	 *
	 * For non-DSC CWB usecases, have the num_lm be decided by the
	 * (mode->hdisplay > MAX_HDISPLAY_SPLIT) check.
	 */

	if (topology.num_intf == 2 && !topology.cwb_enabled)
		topology.num_lm = 2;
	else if (topology.num_dsc == 2)
		topology.num_lm = 2;
	else if (dpu_kms->catalog->caps->has_3d_merge)
		topology.num_lm = (mode->hdisplay > MAX_HDISPLAY_SPLIT) ? 2 : 1;
	else
		topology.num_lm = 1;

	if (crtc_state->ctm)
		topology.num_dspp = topology.num_lm;

	return topology;
}

static int dpu_crtc_assign_resources(struct drm_crtc *crtc,
				     struct drm_crtc_state *crtc_state)
{
	struct dpu_hw_blk *hw_ctl[MAX_CHANNELS_PER_CRTC];
	struct dpu_hw_blk *hw_lm[MAX_CHANNELS_PER_CRTC];
	struct dpu_hw_blk *hw_dspp[MAX_CHANNELS_PER_CRTC];
	int i, num_lm, num_ctl, num_dspp;
	struct dpu_kms *dpu_kms = _dpu_crtc_get_kms(crtc);
	struct dpu_global_state *global_state;
	struct dpu_crtc_state *cstate;
	struct msm_display_topology topology;
	int ret;

	/*
	 * Release and Allocate resources on every modeset
	 */
	global_state = dpu_kms_get_global_state(crtc_state->state);
	if (IS_ERR(global_state))
		return PTR_ERR(global_state);

	dpu_rm_release(global_state, crtc);

	if (!crtc_state->enable)
		return 0;

	topology = dpu_crtc_get_topology(crtc, dpu_kms, crtc_state);
	ret = dpu_rm_reserve(&dpu_kms->rm, global_state,
			     crtc_state->crtc, &topology);
	if (ret)
		return ret;

	cstate = to_dpu_crtc_state(crtc_state);

	num_ctl = dpu_rm_get_assigned_resources(&dpu_kms->rm, global_state,
						crtc_state->crtc,
						DPU_HW_BLK_CTL, hw_ctl,
						ARRAY_SIZE(hw_ctl));
	num_lm = dpu_rm_get_assigned_resources(&dpu_kms->rm, global_state,
					       crtc_state->crtc,
					       DPU_HW_BLK_LM, hw_lm,
					       ARRAY_SIZE(hw_lm));
	num_dspp = dpu_rm_get_assigned_resources(&dpu_kms->rm, global_state,
						 crtc_state->crtc,
						 DPU_HW_BLK_DSPP, hw_dspp,
						 ARRAY_SIZE(hw_dspp));

	for (i = 0; i < num_lm; i++) {
		int ctl_idx = (i < num_ctl) ? i : (num_ctl-1);

		cstate->mixers[i].hw_lm = to_dpu_hw_mixer(hw_lm[i]);
		cstate->mixers[i].lm_ctl = to_dpu_hw_ctl(hw_ctl[ctl_idx]);
		if (i < num_dspp)
			cstate->mixers[i].hw_dspp = to_dpu_hw_dspp(hw_dspp[i]);
	}

	cstate->num_mixers = num_lm;

	return 0;
}

/**
 * dpu_crtc_check_mode_changed: check if full modeset is required
 * @old_crtc_state:	Previous CRTC state
 * @new_crtc_state:	Corresponding CRTC state to be checked
 *
 * Check if the changes in the object properties demand full mode set.
 */
int dpu_crtc_check_mode_changed(struct drm_crtc_state *old_crtc_state,
				struct drm_crtc_state *new_crtc_state)
{
	struct drm_encoder *drm_enc;
	struct drm_crtc *crtc = new_crtc_state->crtc;
	bool clone_mode_enabled = drm_crtc_in_clone_mode(old_crtc_state);
	bool clone_mode_requested = drm_crtc_in_clone_mode(new_crtc_state);

	DRM_DEBUG_ATOMIC("%d\n", crtc->base.id);

	/* there might be cases where encoder needs a modeset too */
	drm_for_each_encoder_mask(drm_enc, crtc->dev, new_crtc_state->encoder_mask) {
		if (dpu_encoder_needs_modeset(drm_enc, new_crtc_state->state))
			new_crtc_state->mode_changed = true;
	}

	if ((clone_mode_requested && !clone_mode_enabled) ||
	    (!clone_mode_requested && clone_mode_enabled))
		new_crtc_state->mode_changed = true;

	return 0;
}

static int dpu_crtc_atomic_check(struct drm_crtc *crtc,
		struct drm_atomic_state *state)
{
	struct drm_crtc_state *crtc_state = drm_atomic_get_new_crtc_state(state,
									  crtc);
	struct dpu_crtc *dpu_crtc = to_dpu_crtc(crtc);
	struct dpu_crtc_state *cstate = to_dpu_crtc_state(crtc_state);

	const struct drm_plane_state *pstate;
	struct drm_plane *plane;

	int rc = 0;

	bool needs_dirtyfb = dpu_crtc_needs_dirtyfb(crtc_state);

	/* don't reallocate resources if only ACTIVE has beeen changed */
	if (crtc_state->mode_changed || crtc_state->connectors_changed) {
		rc = dpu_crtc_assign_resources(crtc, crtc_state);
		if (rc < 0)
			return rc;
	}

	if (dpu_use_virtual_planes &&
	    (crtc_state->planes_changed || crtc_state->zpos_changed)) {
		rc = dpu_crtc_reassign_planes(crtc, crtc_state);
		if (rc < 0)
			return rc;
	}

	if (!crtc_state->enable || !drm_atomic_crtc_effectively_active(crtc_state)) {
		DRM_DEBUG_ATOMIC("crtc%d -> enable %d, active %d, skip atomic_check\n",
				crtc->base.id, crtc_state->enable,
				crtc_state->active);
		memset(&cstate->new_perf, 0, sizeof(cstate->new_perf));
		return 0;
	}

	DRM_DEBUG_ATOMIC("%s: check\n", dpu_crtc->name);

	if (cstate->num_mixers) {
		rc = _dpu_crtc_check_and_setup_lm_bounds(crtc, crtc_state);
		if (rc)
			return rc;
	}

	/* FIXME: move this to dpu_plane_atomic_check? */
	drm_atomic_crtc_state_for_each_plane_state(plane, pstate, crtc_state) {
		struct dpu_plane_state *dpu_pstate = to_dpu_plane_state(pstate);

		if (IS_ERR_OR_NULL(pstate)) {
			rc = PTR_ERR(pstate);
			DPU_ERROR("%s: failed to get plane%d state, %d\n",
					dpu_crtc->name, plane->base.id, rc);
			return rc;
		}

		if (!pstate->visible)
			continue;

		dpu_pstate->needs_dirtyfb = needs_dirtyfb;
	}

	atomic_inc(&_dpu_crtc_get_kms(crtc)->bandwidth_ref);

	rc = dpu_core_perf_crtc_check(crtc, crtc_state);
	if (rc) {
		DPU_ERROR("crtc%d failed performance check %d\n",
				crtc->base.id, rc);
		return rc;
	}

	return 0;
}

static enum drm_mode_status dpu_crtc_mode_valid(struct drm_crtc *crtc,
						const struct drm_display_mode *mode)
{
	struct dpu_kms *dpu_kms = _dpu_crtc_get_kms(crtc);

	/* if there is no 3d_mux block we cannot merge LMs so we cannot
	 * split the large layer into 2 LMs, filter out such modes
	 */
	if (!dpu_kms->catalog->caps->has_3d_merge &&
	    mode->hdisplay > dpu_kms->catalog->caps->max_mixer_width)
		return MODE_BAD_HVALUE;
	/*
	 * max crtc width is equal to the max mixer width * 2 and max height is 4K
	 */
	return drm_mode_validate_size(mode,
				      2 * dpu_kms->catalog->caps->max_mixer_width,
				      4096);
}

/**
 * dpu_crtc_vblank - enable or disable vblanks for this crtc
 * @crtc: Pointer to drm crtc object
 * @en: true to enable vblanks, false to disable
 */
int dpu_crtc_vblank(struct drm_crtc *crtc, bool en)
{
	struct dpu_crtc *dpu_crtc = to_dpu_crtc(crtc);
	struct drm_encoder *enc;

	trace_dpu_crtc_vblank(DRMID(&dpu_crtc->base), en, dpu_crtc);

	/*
	 * Normally we would iterate through encoder_mask in crtc state to find
	 * attached encoders. In this case, we might be disabling vblank _after_
	 * encoder_mask has been cleared.
	 *
	 * Instead, we "assign" a crtc to the encoder in enable and clear it in
	 * disable (which is also after encoder_mask is cleared). So instead of
	 * using encoder mask, we'll ask the encoder to toggle itself iff it's
	 * currently assigned to our crtc.
	 *
	 * Note also that this function cannot be called while crtc is disabled
	 * since we use drm_crtc_vblank_on/off. So we don't need to worry
	 * about the assigned crtcs being inconsistent with the current state
	 * (which means no need to worry about modeset locks).
	 */
	list_for_each_entry(enc, &crtc->dev->mode_config.encoder_list, head) {
		trace_dpu_crtc_vblank_enable(DRMID(crtc), DRMID(enc), en,
					     dpu_crtc);

		dpu_encoder_toggle_vblank_for_crtc(enc, crtc, en);
	}

	return 0;
}

#ifdef CONFIG_DEBUG_FS
static int _dpu_debugfs_status_show(struct seq_file *s, void *data)
{
	struct dpu_crtc *dpu_crtc;
	struct dpu_plane_state *pstate = NULL;
	struct dpu_crtc_mixer *m;

	struct drm_crtc *crtc;
	struct drm_plane *plane;
	struct drm_display_mode *mode;
	struct drm_framebuffer *fb;
	struct drm_plane_state *state;
	struct dpu_crtc_state *cstate;

	int i, out_width;

	dpu_crtc = s->private;
	crtc = &dpu_crtc->base;

	drm_modeset_lock_all(crtc->dev);
	cstate = to_dpu_crtc_state(crtc->state);

	mode = &crtc->state->adjusted_mode;
	out_width = mode->hdisplay / cstate->num_mixers;

	seq_printf(s, "crtc:%d width:%d height:%d\n", crtc->base.id,
				mode->hdisplay, mode->vdisplay);

	seq_puts(s, "\n");

	for (i = 0; i < cstate->num_mixers; ++i) {
		m = &cstate->mixers[i];
		seq_printf(s, "\tmixer:%d ctl:%d width:%d height:%d\n",
			m->hw_lm->idx - LM_0, m->lm_ctl->idx - CTL_0,
			out_width, mode->vdisplay);
	}

	seq_puts(s, "\n");

	drm_atomic_crtc_for_each_plane(plane, crtc) {
		pstate = to_dpu_plane_state(plane->state);
		state = plane->state;

		if (!pstate || !state)
			continue;

		seq_printf(s, "\tplane:%u stage:%d\n", plane->base.id,
			pstate->stage);

		if (plane->state->fb) {
			fb = plane->state->fb;

			seq_printf(s, "\tfb:%d image format:%4.4s wxh:%ux%u ",
				fb->base.id, (char *) &fb->format->format,
				fb->width, fb->height);
			for (i = 0; i < ARRAY_SIZE(fb->format->cpp); ++i)
				seq_printf(s, "cpp[%d]:%u ",
						i, fb->format->cpp[i]);
			seq_puts(s, "\n\t");

			seq_printf(s, "modifier:%8llu ", fb->modifier);
			seq_puts(s, "\n");

			seq_puts(s, "\t");
			for (i = 0; i < ARRAY_SIZE(fb->pitches); i++)
				seq_printf(s, "pitches[%d]:%8u ", i,
							fb->pitches[i]);
			seq_puts(s, "\n");

			seq_puts(s, "\t");
			for (i = 0; i < ARRAY_SIZE(fb->offsets); i++)
				seq_printf(s, "offsets[%d]:%8u ", i,
							fb->offsets[i]);
			seq_puts(s, "\n");
		}

		seq_printf(s, "\tsrc_x:%4d src_y:%4d src_w:%4d src_h:%4d\n",
			state->src_x, state->src_y, state->src_w, state->src_h);

		seq_printf(s, "\tdst x:%4d dst_y:%4d dst_w:%4d dst_h:%4d\n",
			state->crtc_x, state->crtc_y, state->crtc_w,
			state->crtc_h);
		seq_printf(s, "\tsspp[0]:%s\n",
			   pstate->pipe.sspp->cap->name);
		seq_printf(s, "\tmultirect[0]: mode: %d index: %d\n",
			pstate->pipe.multirect_mode, pstate->pipe.multirect_index);
		if (pstate->r_pipe.sspp) {
			seq_printf(s, "\tsspp[1]:%s\n",
				   pstate->r_pipe.sspp->cap->name);
			seq_printf(s, "\tmultirect[1]: mode: %d index: %d\n",
				   pstate->r_pipe.multirect_mode, pstate->r_pipe.multirect_index);
		}

		seq_puts(s, "\n");
	}
	if (dpu_crtc->vblank_cb_count) {
		ktime_t diff = ktime_sub(ktime_get(), dpu_crtc->vblank_cb_time);
		s64 diff_ms = ktime_to_ms(diff);
		s64 fps = diff_ms ? div_s64(
				dpu_crtc->vblank_cb_count * 1000, diff_ms) : 0;

		seq_printf(s,
			"vblank fps:%lld count:%u total:%llums total_framecount:%llu\n",
				fps, dpu_crtc->vblank_cb_count,
				ktime_to_ms(diff), dpu_crtc->play_count);

		/* reset time & count for next measurement */
		dpu_crtc->vblank_cb_count = 0;
		dpu_crtc->vblank_cb_time = ktime_set(0, 0);
	}

	drm_modeset_unlock_all(crtc->dev);

	return 0;
}

DEFINE_SHOW_ATTRIBUTE(_dpu_debugfs_status);

static int dpu_crtc_debugfs_state_show(struct seq_file *s, void *v)
{
	struct drm_crtc *crtc = s->private;
	struct dpu_crtc *dpu_crtc = to_dpu_crtc(crtc);

	seq_printf(s, "client type: %d\n", dpu_crtc_get_client_type(crtc));
	seq_printf(s, "intf_mode: %d\n", dpu_crtc_get_intf_mode(crtc));
	seq_printf(s, "core_clk_rate: %llu\n",
			dpu_crtc->cur_perf.core_clk_rate);
	seq_printf(s, "bw_ctl: %uk\n",
		   (u32)DIV_ROUND_UP_ULL(dpu_crtc->cur_perf.bw_ctl, 1000));
	seq_printf(s, "max_per_pipe_ib: %u\n",
				dpu_crtc->cur_perf.max_per_pipe_ib);

	return 0;
}
DEFINE_SHOW_ATTRIBUTE(dpu_crtc_debugfs_state);

static int _dpu_crtc_init_debugfs(struct drm_crtc *crtc)
{
	struct dpu_crtc *dpu_crtc = to_dpu_crtc(crtc);

	debugfs_create_file("status", 0400,
			crtc->debugfs_entry,
			dpu_crtc, &_dpu_debugfs_status_fops);
	debugfs_create_file("state", 0600,
			crtc->debugfs_entry,
			&dpu_crtc->base,
			&dpu_crtc_debugfs_state_fops);

	return 0;
}
#else
static int _dpu_crtc_init_debugfs(struct drm_crtc *crtc)
{
	return 0;
}
#endif /* CONFIG_DEBUG_FS */

static int dpu_crtc_late_register(struct drm_crtc *crtc)
{
	return _dpu_crtc_init_debugfs(crtc);
}

static const struct drm_crtc_funcs dpu_crtc_funcs = {
	.set_config = drm_atomic_helper_set_config,
	.page_flip = drm_atomic_helper_page_flip,
	.reset = dpu_crtc_reset,
	.atomic_duplicate_state = dpu_crtc_duplicate_state,
	.atomic_destroy_state = dpu_crtc_destroy_state,
	.atomic_print_state = dpu_crtc_atomic_print_state,
	.late_register = dpu_crtc_late_register,
	.verify_crc_source = dpu_crtc_verify_crc_source,
	.set_crc_source = dpu_crtc_set_crc_source,
	.enable_vblank  = msm_crtc_enable_vblank,
	.disable_vblank = msm_crtc_disable_vblank,
	.get_vblank_timestamp = drm_crtc_vblank_helper_get_vblank_timestamp,
	.get_vblank_counter = dpu_crtc_get_vblank_counter,
};

static const struct drm_crtc_helper_funcs dpu_crtc_helper_funcs = {
	.atomic_disable = dpu_crtc_disable,
	.atomic_enable = dpu_crtc_enable,
	.atomic_check = dpu_crtc_atomic_check,
	.atomic_begin = dpu_crtc_atomic_begin,
	.atomic_flush = dpu_crtc_atomic_flush,
	.mode_valid = dpu_crtc_mode_valid,
	.get_scanout_position = dpu_crtc_get_scanout_position,
};

/**
 * dpu_crtc_init - create a new crtc object
 * @dev: dpu device
 * @plane: base plane
 * @cursor: cursor plane
 * @return: new crtc object or error
 *
 * initialize CRTC
 */
struct drm_crtc *dpu_crtc_init(struct drm_device *dev, struct drm_plane *plane,
				struct drm_plane *cursor)
{
	struct msm_drm_private *priv = dev->dev_private;
	struct dpu_kms *dpu_kms = to_dpu_kms(priv->kms);
	struct drm_crtc *crtc = NULL;
	struct dpu_crtc *dpu_crtc;
	int i, ret;

	dpu_crtc = drmm_crtc_alloc_with_planes(dev, struct dpu_crtc, base,
					       plane, cursor,
					       &dpu_crtc_funcs,
					       NULL);

	if (IS_ERR(dpu_crtc))
		return ERR_CAST(dpu_crtc);

	crtc = &dpu_crtc->base;
	crtc->dev = dev;

	spin_lock_init(&dpu_crtc->spin_lock);
	atomic_set(&dpu_crtc->frame_pending, 0);

	init_completion(&dpu_crtc->frame_done_comp);

	INIT_LIST_HEAD(&dpu_crtc->frame_event_list);

	for (i = 0; i < ARRAY_SIZE(dpu_crtc->frame_events); i++) {
		INIT_LIST_HEAD(&dpu_crtc->frame_events[i].list);
		list_add(&dpu_crtc->frame_events[i].list,
				&dpu_crtc->frame_event_list);
		kthread_init_work(&dpu_crtc->frame_events[i].work,
				dpu_crtc_frame_event_work);
	}

	drm_crtc_helper_add(crtc, &dpu_crtc_helper_funcs);

	if (dpu_kms->catalog->dspp_count)
		drm_crtc_enable_color_mgmt(crtc, 0, true, 0);

	/* save user friendly CRTC name for later */
	snprintf(dpu_crtc->name, DPU_CRTC_NAME_SIZE, "crtc%u", crtc->base.id);

	/* initialize event handling */
	spin_lock_init(&dpu_crtc->event_lock);

	ret = drm_self_refresh_helper_init(crtc);
	if (ret) {
		DPU_ERROR("Failed to initialize %s with self-refresh helpers %d\n",
			crtc->name, ret);
		return ERR_PTR(ret);
	}

	DRM_DEBUG_KMS("%s: successfully initialized crtc\n", dpu_crtc->name);
	return crtc;
}