path: root/drivers/gpu/drm/arm/display/komeda/komeda_pipeline_state.c

// SPDX-License-Identifier: GPL-2.0
/*
 * (C) COPYRIGHT 2018 ARM Limited. All rights reserved.
 * Author: James.Qian.Wang <james.qian.wang@arm.com>
 *
 */

#include <drm/drm_print.h>
#include <linux/clk.h>
#include "komeda_dev.h"
#include "komeda_kms.h"
#include "komeda_pipeline.h"
#include "komeda_framebuffer.h"

static inline bool is_switching_user(void *old, void *new)
{
	if (!old || !new)
		return false;

	return old != new;
}

static struct komeda_pipeline_state *
komeda_pipeline_get_state(struct komeda_pipeline *pipe,
			  struct drm_atomic_state *state)
{
	struct drm_private_state *priv_st;

	priv_st = drm_atomic_get_private_obj_state(state, &pipe->obj);
	if (IS_ERR(priv_st))
		return ERR_CAST(priv_st);

	return priv_to_pipe_st(priv_st);
}

struct komeda_pipeline_state *
komeda_pipeline_get_old_state(struct komeda_pipeline *pipe,
			      struct drm_atomic_state *state)
{
	struct drm_private_state *priv_st;

	priv_st = drm_atomic_get_old_private_obj_state(state, &pipe->obj);
	if (priv_st)
		return priv_to_pipe_st(priv_st);
	return NULL;
}

static struct komeda_pipeline_state *
komeda_pipeline_get_new_state(struct komeda_pipeline *pipe,
			      struct drm_atomic_state *state)
{
	struct drm_private_state *priv_st;

	priv_st = drm_atomic_get_new_private_obj_state(state, &pipe->obj);
	if (priv_st)
		return priv_to_pipe_st(priv_st);
	return NULL;
}

/* Assign pipeline for crtc */
static struct komeda_pipeline_state *
komeda_pipeline_get_state_and_set_crtc(struct komeda_pipeline *pipe,
				       struct drm_atomic_state *state,
				       struct drm_crtc *crtc)
{
	struct komeda_pipeline_state *st;

	st = komeda_pipeline_get_state(pipe, state);
	if (IS_ERR(st))
		return st;

	if (is_switching_user(crtc, st->crtc)) {
		DRM_DEBUG_ATOMIC("CRTC%d required pipeline%d is busy.\n",
				 drm_crtc_index(crtc), pipe->id);
		return ERR_PTR(-EBUSY);
	}

	/* pipeline only can be disabled when the it is free or unused */
	if (!crtc && st->active_comps) {
		DRM_DEBUG_ATOMIC("Disabling a busy pipeline:%d.\n", pipe->id);
		return ERR_PTR(-EBUSY);
	}

	st->crtc = crtc;

	if (crtc) {
		struct komeda_crtc_state *kcrtc_st;

		kcrtc_st = to_kcrtc_st(drm_atomic_get_new_crtc_state(state,
								     crtc));

		kcrtc_st->active_pipes |= BIT(pipe->id);
		kcrtc_st->affected_pipes |= BIT(pipe->id);
	}
	return st;
}

static struct komeda_component_state *
komeda_component_get_state(struct komeda_component *c,
			   struct drm_atomic_state *state)
{
	struct drm_private_state *priv_st;

	WARN_ON(!drm_modeset_is_locked(&c->pipeline->obj.lock));

	priv_st = drm_atomic_get_priv