1/*
  2 * Copyright (C) 2015 Free Electrons
  3 * Copyright (C) 2015 NextThing Co
  4 *
  5 * Maxime Ripard <maxime.ripard@free-electrons.com>
  6 *
  7 * This program is free software; you can redistribute it and/or
  8 * modify it under the terms of the GNU General Public License as
  9 * published by the Free Software Foundation; either version 2 of
 10 * the License, or (at your option) any later version.
 11 */
 12
 13#include <linux/clk.h>
 14
 15#include <drm/drmP.h>
 16#include <drm/drm_atomic_helper.h>
 17#include <drm/drm_crtc_helper.h>
 18#include <drm/drm_of.h>
 19#include <drm/drm_panel.h>
 20
 21#include "sun4i_crtc.h"
 22#include "sun4i_tcon.h"
 23#include "sun4i_rgb.h"
 24
 25struct sun4i_rgb {
 26	struct drm_connector	connector;
 27	struct drm_encoder	encoder;
 28
 29	struct sun4i_tcon	*tcon;
 30};
 31
 32static inline struct sun4i_rgb *
 33drm_connector_to_sun4i_rgb(struct drm_connector *connector)
 34{
 35	return container_of(connector, struct sun4i_rgb,
 36			    connector);
 37}
 38
 39static inline struct sun4i_rgb *
 40drm_encoder_to_sun4i_rgb(struct drm_encoder *encoder)
 41{
 42	return container_of(encoder, struct sun4i_rgb,
 43			    encoder);
 44}
 45
 46static int sun4i_rgb_get_modes(struct drm_connector *connector)
 47{
 48	struct sun4i_rgb *rgb =
 49		drm_connector_to_sun4i_rgb(connector);
 50	struct sun4i_tcon *tcon = rgb->tcon;
 51
 52	return drm_panel_get_modes(tcon->panel);
 53}
 54
 55static enum drm_mode_status sun4i_rgb_mode_valid(struct drm_encoder *crtc,
 56						 const struct drm_display_mode *mode)
 57{
 58	struct sun4i_rgb *rgb = drm_encoder_to_sun4i_rgb(crtc);
 59	struct sun4i_tcon *tcon = rgb->tcon;
 60	u32 hsync = mode->hsync_end - mode->hsync_start;
 61	u32 vsync = mode->vsync_end - mode->vsync_start;
 62	unsigned long rate = mode->clock * 1000;
 63	long rounded_rate;
 64
 65	DRM_DEBUG_DRIVER("Validating modes...\n");
 66
 67	if (hsync < 1)
 68		return MODE_HSYNC_NARROW;
 69
 70	if (hsync > 0x3ff)
 71		return MODE_HSYNC_WIDE;
 72
 73	if ((mode->hdisplay < 1) || (mode->htotal < 1))
 74		return MODE_H_ILLEGAL;
 75
 76	if ((mode->hdisplay > 0x7ff) || (mode->htotal > 0xfff))
 77		return MODE_BAD_HVALUE;
 78
 79	DRM_DEBUG_DRIVER("Horizontal parameters OK\n");
 80
 81	if (vsync < 1)
 82		return MODE_VSYNC_NARROW;
 83
 84	if (vsync > 0x3ff)
 85		return MODE_VSYNC_WIDE;
 86
 87	if ((mode->vdisplay < 1) || (mode->vtotal < 1))
 88		return MODE_V_ILLEGAL;
 89
 90	if ((mode->vdisplay > 0x7ff) || (mode->vtotal > 0xfff))
 91		return MODE_BAD_VVALUE;
 92
 93	DRM_DEBUG_DRIVER("Vertical parameters OK\n");
 94
 95	tcon->dclk_min_div = 6;
 96	tcon->dclk_max_div = 127;
 97	rounded_rate = clk_round_rate(tcon->dclk, rate);
 98	if (rounded_rate < rate)
 99		return MODE_CLOCK_LOW;
100
101	if (rounded_rate > rate)
102		return MODE_CLOCK_HIGH;
103
104	DRM_DEBUG_DRIVER("Clock rate OK\n");
105
106	return MODE_OK;
107}
108
109static struct drm_connector_helper_funcs sun4i_rgb_con_helper_funcs = {
110	.get_modes	= sun4i_rgb_get_modes,
111};
112
113static void
114sun4i_rgb_connector_destroy(struct drm_connector *connector)
115{
116	struct sun4i_rgb *rgb = drm_connector_to_sun4i_rgb(connector);
117	struct sun4i_tcon *tcon = rgb->tcon;
118
119	drm_panel_detach(tcon->panel);
120	drm_connector_cleanup(connector);
121}
122
123static const struct drm_connector_funcs sun4i_rgb_con_funcs = {
124	.fill_modes		= drm_helper_probe_single_connector_modes,
125	.destroy		= sun4i_rgb_connector_destroy,
126	.reset			= drm_atomic_helper_connector_reset,
127	.atomic_duplicate_state	= drm_atomic_helper_connector_duplicate_state,
128	.atomic_destroy_state	= drm_atomic_helper_connector_destroy_state,
129};
130
131static void sun4i_rgb_encoder_enable(struct drm_encoder *encoder)
132{
133	struct sun4i_rgb *rgb = drm_encoder_to_sun4i_rgb(encoder);
134	struct sun4i_tcon *tcon = rgb->tcon;
135
136	DRM_DEBUG_DRIVER("Enabling RGB output\n");
137
138	if (!IS_ERR(tcon->panel)) {
139		drm_panel_prepare(tcon->panel);
140		drm_panel_enable(tcon->panel);
141	}
142}
143
144static void sun4i_rgb_encoder_disable(struct drm_encoder *encoder)
145{
146	struct sun4i_rgb *rgb = drm_encoder_to_sun4i_rgb(encoder);
147	struct sun4i_tcon *tcon = rgb->tcon;
148
149	DRM_DEBUG_DRIVER("Disabling RGB output\n");
150
151	if (!IS_ERR(tcon->panel)) {
152		drm_panel_disable(tcon->panel);
153		drm_panel_unprepare(tcon->panel);
154	}
155}
156
157static struct drm_encoder_helper_funcs sun4i_rgb_enc_helper_funcs = {
158	.disable	= sun4i_rgb_encoder_disable,
159	.enable		= sun4i_rgb_encoder_enable,
160	.mode_valid	= sun4i_rgb_mode_valid,
161};
162
163static void sun4i_rgb_enc_destroy(struct drm_encoder *encoder)
164{
165	drm_encoder_cleanup(encoder);
166}
167
168static struct drm_encoder_funcs sun4i_rgb_enc_funcs = {
169	.destroy	= sun4i_rgb_enc_destroy,
170};
171
172int sun4i_rgb_init(struct drm_device *drm, struct sun4i_tcon *tcon)
173{
174	struct drm_encoder *encoder;
175	struct drm_bridge *bridge;
176	struct sun4i_rgb *rgb;
177	int ret;
178
179	rgb = devm_kzalloc(drm->dev, sizeof(*rgb), GFP_KERNEL);
180	if (!rgb)
181		return -ENOMEM;
182	rgb->tcon = tcon;
183	encoder = &rgb->encoder;
184
185	ret = drm_of_find_panel_or_bridge(tcon->dev->of_node, 1, 0,
186					  &tcon->panel, &bridge);
187	if (ret) {
188		dev_info(drm->dev, "No panel or bridge found... RGB output disabled\n");
189		return 0;
190	}
191
192	drm_encoder_helper_add(&rgb->encoder,
193			       &sun4i_rgb_enc_helper_funcs);
194	ret = drm_encoder_init(drm,
195			       &rgb->encoder,
196			       &sun4i_rgb_enc_funcs,
197			       DRM_MODE_ENCODER_NONE,
198			       NULL);
199	if (ret) {
200		dev_err(drm->dev, "Couldn't initialise the rgb encoder\n");
201		goto err_out;
202	}
203
204	/* The RGB encoder can only work with the TCON channel 0 */
205	rgb->encoder.possible_crtcs = BIT(drm_crtc_index(&tcon->crtc->crtc));
206
207	if (tcon->panel) {
208		drm_connector_helper_add(&rgb->connector,
209					 &sun4i_rgb_con_helper_funcs);
210		ret = drm_connector_init(drm, &rgb->connector,
211					 &sun4i_rgb_con_funcs,
212					 DRM_MODE_CONNECTOR_Unknown);
213		if (ret) {
214			dev_err(drm->dev, "Couldn't initialise the rgb connector\n");
215			goto err_cleanup_connector;
216		}
217
218		drm_mode_connector_attach_encoder(&rgb->connector,
219						  &rgb->encoder);
220
221		ret = drm_panel_attach(tcon->panel, &rgb->connector);
222		if (ret) {
223			dev_err(drm->dev, "Couldn't attach our panel\n");
224			goto err_cleanup_connector;
225		}
226	}
227
228	if (bridge) {
229		ret = drm_bridge_attach(encoder, bridge, NULL);
230		if (ret) {
231			dev_err(drm->dev, "Couldn't attach our bridge\n");
232			goto err_cleanup_connector;
233		}
234	}
235
236	return 0;
237
238err_cleanup_connector:
239	drm_encoder_cleanup(&rgb->encoder);
240err_out:
241	return ret;
242}
243EXPORT_SYMBOL(sun4i_rgb_init);