dc-pe.c

  1// SPDX-License-Identifier: GPL-2.0+
  2/*
  3 * Copyright 2024 NXP
  4 */
  5
  6#include <linux/clk.h>
  7#include <linux/component.h>
  8#include <linux/mod_devicetable.h>
  9#include <linux/module.h>
 10#include <linux/of.h>
 11#include <linux/of_platform.h>
 12#include <linux/platform_device.h>
 13#include <linux/pm.h>
 14#include <linux/pm_runtime.h>
 15
 16#include "dc-drv.h"
 17#include "dc-fu.h"
 18#include "dc-pe.h"
 19
 20static int dc_pe_bind(struct device *dev, struct device *master, void *data)
 21{
 22	struct dc_drm_device *dc_drm = data;
 23	struct dc_pe *pe;
 24	int ret;
 25
 26	pe = devm_kzalloc(dev, sizeof(*pe), GFP_KERNEL);
 27	if (!pe)
 28		return -ENOMEM;
 29
 30	pe->clk_axi = devm_clk_get(dev, NULL);
 31	if (IS_ERR(pe->clk_axi))
 32		return dev_err_probe(dev, PTR_ERR(pe->clk_axi),
 33				     "failed to get AXI clock\n");
 34
 35	pe->dev = dev;
 36
 37	dev_set_drvdata(dev, pe);
 38
 39	ret = devm_pm_runtime_enable(dev);
 40	if (ret)
 41		return ret;
 42
 43	dc_drm->pe = pe;
 44
 45	return 0;
 46}
 47
 48/*
 49 * It's possible to get the child device pointers from the child component
 50 * bind callbacks, but it depends on the component helper behavior to bind
 51 * the pixel engine component first.  To avoid the dependency, post bind to
 52 * get the pointers from dc_drm in a safe manner.
 53 */
 54void dc_pe_post_bind(struct dc_drm_device *dc_drm)
 55{
 56	struct dc_pe *pe = dc_drm->pe;
 57	int i;
 58
 59	for (i = 0; i < DC_DISPLAYS; i++) {
 60		pe->cf_safe[i] = dc_drm->cf_safe[i];
 61		pe->cf_cont[i] = dc_drm->cf_cont[i];
 62		pe->ed_safe[i] = dc_drm->ed_safe[i];
 63		pe->ed_cont[i] = dc_drm->ed_cont[i];
 64	}
 65
 66	for (i = 0; i < DC_DISP_FU_CNT; i++)
 67		pe->fu_disp[i] = dc_drm->fu_disp[i];
 68
 69	for (i = 0; i < DC_LB_CNT; i++)
 70		pe->lb[i] = dc_drm->lb[i];
 71}
 72
 73static const struct component_ops dc_pe_ops = {
 74	.bind = dc_pe_bind,
 75};
 76
 77static int dc_pe_probe(struct platform_device *pdev)
 78{
 79	int ret;
 80
 81	ret = devm_of_platform_populate(&pdev->dev);
 82	if (ret < 0)
 83		return ret;
 84
 85	ret = component_add(&pdev->dev, &dc_pe_ops);
 86	if (ret)
 87		return dev_err_probe(&pdev->dev, ret,
 88				     "failed to add component\n");
 89
 90	return 0;
 91}
 92
 93static void dc_pe_remove(struct platform_device *pdev)
 94{
 95	component_del(&pdev->dev, &dc_pe_ops);
 96}
 97
 98static int dc_pe_runtime_suspend(struct device *dev)
 99{
100	struct dc_pe *pe = dev_get_drvdata(dev);
101
102	clk_disable_unprepare(pe->clk_axi);
103
104	return 0;
105}
106
107static int dc_pe_runtime_resume(struct device *dev)
108{
109	struct dc_pe *pe = dev_get_drvdata(dev);
110	int i, ret;
111
112	ret = clk_prepare_enable(pe->clk_axi);
113	if (ret) {
114		dev_err(dev, "failed to enable AXI clock: %d\n", ret);
115		return ret;
116	}
117
118	for (i = 0; i < ARRAY_SIZE(pe->cf_safe); i++)
119		dc_cf_init(pe->cf_safe[i]);
120
121	for (i = 0; i < ARRAY_SIZE(pe->cf_cont); i++)
122		dc_cf_init(pe->cf_cont[i]);
123
124	for (i = 0; i < ARRAY_SIZE(pe->ed_safe); i++)
125		dc_ed_init(pe->ed_safe[i]);
126
127	for (i = 0; i < ARRAY_SIZE(pe->ed_cont); i++)
128		dc_ed_init(pe->ed_cont[i]);
129
130	for (i = 0; i < ARRAY_SIZE(pe->fu_disp); i++)
131		pe->fu_disp[i]->ops.init(pe->fu_disp[i]);
132
133	for (i = 0; i < ARRAY_SIZE(pe->lb); i++)
134		dc_lb_init(pe->lb[i]);
135
136	return 0;
137}
138
139static const struct dev_pm_ops dc_pe_pm_ops = {
140	RUNTIME_PM_OPS(dc_pe_runtime_suspend, dc_pe_runtime_resume, NULL)
141};
142
143static const struct of_device_id dc_pe_dt_ids[] = {
144	{ .compatible = "fsl,imx8qxp-dc-pixel-engine", },
145	{ /* sentinel */ }
146};
147MODULE_DEVICE_TABLE(of, dc_pe_dt_ids);
148
149struct platform_driver dc_pe_driver = {
150	.probe = dc_pe_probe,
151	.remove = dc_pe_remove,
152	.driver = {
153		.name = "imx8-dc-pixel-engine",
154		.suppress_bind_attrs = true,
155		.of_match_table = dc_pe_dt_ids,
156		.pm = pm_sleep_ptr(&dc_pe_pm_ops),
157	},
158};