2 * Copyright (C) 2015 Free Electrons
3 * Copyright (C) 2015 NextThing Co
5 * Maxime Ripard <maxime.ripard@free-electrons.com>
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.
13 #include <linux/clk.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>
21 #include "sun4i_crtc.h"
22 #include "sun4i_tcon.h"
23 #include "sun4i_rgb.h"
26 struct drm_connector connector;
27 struct drm_encoder encoder;
29 struct sun4i_tcon *tcon;
32 static inline struct sun4i_rgb *
33 drm_connector_to_sun4i_rgb(struct drm_connector *connector)
35 return container_of(connector, struct sun4i_rgb,
39 static inline struct sun4i_rgb *
40 drm_encoder_to_sun4i_rgb(struct drm_encoder *encoder)
42 return container_of(encoder, struct sun4i_rgb,
46 static int sun4i_rgb_get_modes(struct drm_connector *connector)
48 struct sun4i_rgb *rgb =
49 drm_connector_to_sun4i_rgb(connector);
50 struct sun4i_tcon *tcon = rgb->tcon;
52 return drm_panel_get_modes(tcon->panel);
55 static int sun4i_rgb_mode_valid(struct drm_connector *connector,
56 struct drm_display_mode *mode)
58 struct sun4i_rgb *rgb = drm_connector_to_sun4i_rgb(connector);
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;
65 DRM_DEBUG_DRIVER("Validating modes...\n");
68 return MODE_HSYNC_NARROW;
71 return MODE_HSYNC_WIDE;
73 if ((mode->hdisplay < 1) || (mode->htotal < 1))
74 return MODE_H_ILLEGAL;
76 if ((mode->hdisplay > 0x7ff) || (mode->htotal > 0xfff))
77 return MODE_BAD_HVALUE;
79 DRM_DEBUG_DRIVER("Horizontal parameters OK\n");
82 return MODE_VSYNC_NARROW;
85 return MODE_VSYNC_WIDE;
87 if ((mode->vdisplay < 1) || (mode->vtotal < 1))
88 return MODE_V_ILLEGAL;
90 if ((mode->vdisplay > 0x7ff) || (mode->vtotal > 0xfff))
91 return MODE_BAD_VVALUE;
93 DRM_DEBUG_DRIVER("Vertical parameters OK\n");
95 rounded_rate = clk_round_rate(tcon->dclk, rate);
96 if (rounded_rate < rate)
97 return MODE_CLOCK_LOW;
99 if (rounded_rate > rate)
100 return MODE_CLOCK_HIGH;
102 DRM_DEBUG_DRIVER("Clock rate OK\n");
107 static struct drm_connector_helper_funcs sun4i_rgb_con_helper_funcs = {
108 .get_modes = sun4i_rgb_get_modes,
109 .mode_valid = sun4i_rgb_mode_valid,
113 sun4i_rgb_connector_destroy(struct drm_connector *connector)
115 struct sun4i_rgb *rgb = drm_connector_to_sun4i_rgb(connector);
116 struct sun4i_tcon *tcon = rgb->tcon;
118 drm_panel_detach(tcon->panel);
119 drm_connector_cleanup(connector);
122 static const struct drm_connector_funcs sun4i_rgb_con_funcs = {
123 .fill_modes = drm_helper_probe_single_connector_modes,
124 .destroy = sun4i_rgb_connector_destroy,
125 .reset = drm_atomic_helper_connector_reset,
126 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
127 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
130 static int sun4i_rgb_atomic_check(struct drm_encoder *encoder,
131 struct drm_crtc_state *crtc_state,
132 struct drm_connector_state *conn_state)
137 static void sun4i_rgb_encoder_enable(struct drm_encoder *encoder)
139 struct sun4i_rgb *rgb = drm_encoder_to_sun4i_rgb(encoder);
140 struct sun4i_tcon *tcon = rgb->tcon;
142 DRM_DEBUG_DRIVER("Enabling RGB output\n");
144 if (!IS_ERR(tcon->panel))
145 drm_panel_prepare(tcon->panel);
147 sun4i_tcon_channel_enable(tcon, 0);
149 if (!IS_ERR(tcon->panel))
150 drm_panel_enable(tcon->panel);
153 static void sun4i_rgb_encoder_disable(struct drm_encoder *encoder)
155 struct sun4i_rgb *rgb = drm_encoder_to_sun4i_rgb(encoder);
156 struct sun4i_tcon *tcon = rgb->tcon;
158 DRM_DEBUG_DRIVER("Disabling RGB output\n");
160 if (!IS_ERR(tcon->panel))
161 drm_panel_disable(tcon->panel);
163 sun4i_tcon_channel_disable(tcon, 0);
165 if (!IS_ERR(tcon->panel))
166 drm_panel_unprepare(tcon->panel);
169 static void sun4i_rgb_encoder_mode_set(struct drm_encoder *encoder,
170 struct drm_display_mode *mode,
171 struct drm_display_mode *adjusted_mode)
173 struct sun4i_rgb *rgb = drm_encoder_to_sun4i_rgb(encoder);
174 struct sun4i_tcon *tcon = rgb->tcon;
176 sun4i_tcon0_mode_set(tcon, mode);
177 sun4i_tcon_set_mux(tcon, 0, encoder);
179 /* FIXME: This seems to be board specific */
180 clk_set_phase(tcon->dclk, 120);
183 static struct drm_encoder_helper_funcs sun4i_rgb_enc_helper_funcs = {
184 .atomic_check = sun4i_rgb_atomic_check,
185 .mode_set = sun4i_rgb_encoder_mode_set,
186 .disable = sun4i_rgb_encoder_disable,
187 .enable = sun4i_rgb_encoder_enable,
190 static void sun4i_rgb_enc_destroy(struct drm_encoder *encoder)
192 drm_encoder_cleanup(encoder);
195 static struct drm_encoder_funcs sun4i_rgb_enc_funcs = {
196 .destroy = sun4i_rgb_enc_destroy,
199 int sun4i_rgb_init(struct drm_device *drm, struct sun4i_tcon *tcon)
201 struct drm_encoder *encoder;
202 struct drm_bridge *bridge;
203 struct sun4i_rgb *rgb;
206 rgb = devm_kzalloc(drm->dev, sizeof(*rgb), GFP_KERNEL);
210 encoder = &rgb->encoder;
212 ret = drm_of_find_panel_or_bridge(tcon->dev->of_node, 1, 0,
213 &tcon->panel, &bridge);
215 dev_info(drm->dev, "No panel or bridge found... RGB output disabled\n");
219 drm_encoder_helper_add(&rgb->encoder,
220 &sun4i_rgb_enc_helper_funcs);
221 ret = drm_encoder_init(drm,
223 &sun4i_rgb_enc_funcs,
224 DRM_MODE_ENCODER_NONE,
227 dev_err(drm->dev, "Couldn't initialise the rgb encoder\n");
231 /* The RGB encoder can only work with the TCON channel 0 */
232 rgb->encoder.possible_crtcs = BIT(drm_crtc_index(&tcon->crtc->crtc));
235 drm_connector_helper_add(&rgb->connector,
236 &sun4i_rgb_con_helper_funcs);
237 ret = drm_connector_init(drm, &rgb->connector,
238 &sun4i_rgb_con_funcs,
239 DRM_MODE_CONNECTOR_Unknown);
241 dev_err(drm->dev, "Couldn't initialise the rgb connector\n");
242 goto err_cleanup_connector;
245 drm_mode_connector_attach_encoder(&rgb->connector,
248 ret = drm_panel_attach(tcon->panel, &rgb->connector);
250 dev_err(drm->dev, "Couldn't attach our panel\n");
251 goto err_cleanup_connector;
256 ret = drm_bridge_attach(encoder, bridge, NULL);
258 dev_err(drm->dev, "Couldn't attach our bridge\n");
259 goto err_cleanup_connector;
265 err_cleanup_connector:
266 drm_encoder_cleanup(&rgb->encoder);
270 EXPORT_SYMBOL(sun4i_rgb_init);