1// SPDX-License-Identifier: GPL-2.0+
  2/*
  3 * Copyright (c) 2018 Jernej Skrabec <jernej.skrabec@siol.net>
  4 */
  5
  6#include <linux/component.h>
  7#include <linux/module.h>
  8#include <linux/platform_device.h>
  9
 10#include <drm/drm_of.h>
 11#include <drm/drmP.h>
 12#include <drm/drm_crtc_helper.h>
 13
 14#include "sun8i_dw_hdmi.h"
 15
 16static void sun8i_dw_hdmi_encoder_mode_set(struct drm_encoder *encoder,
 17					   struct drm_display_mode *mode,
 18					   struct drm_display_mode *adj_mode)
 19{
 20	struct sun8i_dw_hdmi *hdmi = encoder_to_sun8i_dw_hdmi(encoder);
 21
 22	clk_set_rate(hdmi->clk_tmds, mode->crtc_clock * 1000);
 23}
 24
 25static const struct drm_encoder_helper_funcs
 26sun8i_dw_hdmi_encoder_helper_funcs = {
 27	.mode_set = sun8i_dw_hdmi_encoder_mode_set,
 28};
 29
 30static const struct drm_encoder_funcs sun8i_dw_hdmi_encoder_funcs = {
 31	.destroy = drm_encoder_cleanup,
 32};
 33
 34static enum drm_mode_status
 35sun8i_dw_hdmi_mode_valid(struct drm_connector *connector,
 36			 const struct drm_display_mode *mode)
 37{
 38	if (mode->clock > 297000)
 39		return MODE_CLOCK_HIGH;
 40
 41	return MODE_OK;
 42}
 43
 44static int sun8i_dw_hdmi_bind(struct device *dev, struct device *master,
 45			      void *data)
 46{
 47	struct platform_device *pdev = to_platform_device(dev);
 48	struct dw_hdmi_plat_data *plat_data;
 49	struct drm_device *drm = data;
 50	struct device_node *phy_node;
 51	struct drm_encoder *encoder;
 52	struct sun8i_dw_hdmi *hdmi;
 53	int ret;
 54
 55	if (!pdev->dev.of_node)
 56		return -ENODEV;
 57
 58	hdmi = devm_kzalloc(&pdev->dev, sizeof(*hdmi), GFP_KERNEL);
 59	if (!hdmi)
 60		return -ENOMEM;
 61
 62	plat_data = &hdmi->plat_data;
 63	hdmi->dev = &pdev->dev;
 64	encoder = &hdmi->encoder;
 65
 66	encoder->possible_crtcs = drm_of_find_possible_crtcs(drm, dev->of_node);
 67	/*
 68	 * If we failed to find the CRTC(s) which this encoder is
 69	 * supposed to be connected to, it's because the CRTC has
 70	 * not been registered yet.  Defer probing, and hope that
 71	 * the required CRTC is added later.
 72	 */
 73	if (encoder->possible_crtcs == 0)
 74		return -EPROBE_DEFER;
 75
 76	hdmi->rst_ctrl = devm_reset_control_get(dev, "ctrl");
 77	if (IS_ERR(hdmi->rst_ctrl)) {
 78		dev_err(dev, "Could not get ctrl reset control\n");
 79		return PTR_ERR(hdmi->rst_ctrl);
 80	}
 81
 82	hdmi->clk_tmds = devm_clk_get(dev, "tmds");
 83	if (IS_ERR(hdmi->clk_tmds)) {
 84		dev_err(dev, "Couldn't get the tmds clock\n");
 85		return PTR_ERR(hdmi->clk_tmds);
 86	}
 87
 88	ret = reset_control_deassert(hdmi->rst_ctrl);
 89	if (ret) {
 90		dev_err(dev, "Could not deassert ctrl reset control\n");
 91		return ret;
 92	}
 93
 94	ret = clk_prepare_enable(hdmi->clk_tmds);
 95	if (ret) {
 96		dev_err(dev, "Could not enable tmds clock\n");
 97		goto err_assert_ctrl_reset;
 98	}
 99
100	phy_node = of_parse_phandle(dev->of_node, "phys", 0);
101	if (!phy_node) {
102		dev_err(dev, "Can't found PHY phandle\n");
103		goto err_disable_clk_tmds;
104	}
105
106	ret = sun8i_hdmi_phy_probe(hdmi, phy_node);
107	of_node_put(phy_node);
108	if (ret) {
109		dev_err(dev, "Couldn't get the HDMI PHY\n");
110		goto err_disable_clk_tmds;
111	}
112
113	drm_encoder_helper_add(encoder, &sun8i_dw_hdmi_encoder_helper_funcs);
114	drm_encoder_init(drm, encoder, &sun8i_dw_hdmi_encoder_funcs,
115			 DRM_MODE_ENCODER_TMDS, NULL);
116
117	sun8i_hdmi_phy_init(hdmi->phy);
118
119	plat_data->mode_valid = &sun8i_dw_hdmi_mode_valid;
120	plat_data->phy_ops = sun8i_hdmi_phy_get_ops();
121	plat_data->phy_name = "sun8i_dw_hdmi_phy";
122	plat_data->phy_data = hdmi->phy;
123
124	platform_set_drvdata(pdev, hdmi);
125
126	hdmi->hdmi = dw_hdmi_bind(pdev, encoder, plat_data);
127
128	/*
129	 * If dw_hdmi_bind() fails we'll never call dw_hdmi_unbind(),
130	 * which would have called the encoder cleanup.  Do it manually.
131	 */
132	if (IS_ERR(hdmi->hdmi)) {
133		ret = PTR_ERR(hdmi->hdmi);
134		goto cleanup_encoder;
135	}
136
137	return 0;
138
139cleanup_encoder:
140	drm_encoder_cleanup(encoder);
141	sun8i_hdmi_phy_remove(hdmi);
142err_disable_clk_tmds:
143	clk_disable_unprepare(hdmi->clk_tmds);
144err_assert_ctrl_reset:
145	reset_control_assert(hdmi->rst_ctrl);
146
147	return ret;
148}
149
150static void sun8i_dw_hdmi_unbind(struct device *dev, struct device *master,
151				 void *data)
152{
153	struct sun8i_dw_hdmi *hdmi = dev_get_drvdata(dev);
154
155	dw_hdmi_unbind(hdmi->hdmi);
156	sun8i_hdmi_phy_remove(hdmi);
157	clk_disable_unprepare(hdmi->clk_tmds);
158	reset_control_assert(hdmi->rst_ctrl);
159}
160
161static const struct component_ops sun8i_dw_hdmi_ops = {
162	.bind	= sun8i_dw_hdmi_bind,
163	.unbind	= sun8i_dw_hdmi_unbind,
164};
165
166static int sun8i_dw_hdmi_probe(struct platform_device *pdev)
167{
168	return component_add(&pdev->dev, &sun8i_dw_hdmi_ops);
169}
170
171static int sun8i_dw_hdmi_remove(struct platform_device *pdev)
172{
173	component_del(&pdev->dev, &sun8i_dw_hdmi_ops);
174
175	return 0;
176}
177
178static const struct of_device_id sun8i_dw_hdmi_dt_ids[] = {
179	{ .compatible = "allwinner,sun8i-a83t-dw-hdmi" },
180	{ /* sentinel */ },
181};
182MODULE_DEVICE_TABLE(of, sun8i_dw_hdmi_dt_ids);
183
184struct platform_driver sun8i_dw_hdmi_pltfm_driver = {
185	.probe  = sun8i_dw_hdmi_probe,
186	.remove = sun8i_dw_hdmi_remove,
187	.driver = {
188		.name = "sun8i-dw-hdmi",
189		.of_match_table = sun8i_dw_hdmi_dt_ids,
190	},
191};
192module_platform_driver(sun8i_dw_hdmi_pltfm_driver);
193
194MODULE_AUTHOR("Jernej Skrabec <jernej.skrabec@siol.net>");
195MODULE_DESCRIPTION("Allwinner DW HDMI bridge");
196MODULE_LICENSE("GPL");