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8
9#include <linux/clk.h>
10
11#include <drm/drmP.h>
12#include <drm/drm_atomic_helper.h>
13#include <drm/drm_of.h>
14#include <drm/drm_panel.h>
15#include <drm/drm_probe_helper.h>
16
17#include "sun4i_crtc.h"
18#include "sun4i_tcon.h"
19#include "sun4i_rgb.h"
20
21struct sun4i_rgb {
22 struct drm_connector connector;
23 struct drm_encoder encoder;
24
25 struct sun4i_tcon *tcon;
26 struct drm_panel *panel;
27 struct drm_bridge *bridge;
28};
29
30static inline struct sun4i_rgb *
31drm_connector_to_sun4i_rgb(struct drm_connector *connector)
32{
33 return container_of(connector, struct sun4i_rgb,
34 connector);
35}
36
37static inline struct sun4i_rgb *
38drm_encoder_to_sun4i_rgb(struct drm_encoder *encoder)
39{
40 return container_of(encoder, struct sun4i_rgb,
41 encoder);
42}
43
44static int sun4i_rgb_get_modes(struct drm_connector *connector)
45{
46 struct sun4i_rgb *rgb =
47 drm_connector_to_sun4i_rgb(connector);
48
49 return drm_panel_get_modes(rgb->panel);
50}
51
52
53
54
55
56
57
58#define SUN4I_RGB_DOTCLOCK_TOLERANCE_PER_MILLE 5
59
60static enum drm_mode_status sun4i_rgb_mode_valid(struct drm_encoder *crtc,
61 const struct drm_display_mode *mode)
62{
63 struct sun4i_rgb *rgb = drm_encoder_to_sun4i_rgb(crtc);
64 struct sun4i_tcon *tcon = rgb->tcon;
65 u32 hsync = mode->hsync_end - mode->hsync_start;
66 u32 vsync = mode->vsync_end - mode->vsync_start;
67 unsigned long long rate = mode->clock * 1000;
68 unsigned long long lowest, highest;
69 unsigned long long rounded_rate;
70
71 DRM_DEBUG_DRIVER("Validating modes...\n");
72
73 if (hsync < 1)
74 return MODE_HSYNC_NARROW;
75
76 if (hsync > 0x3ff)
77 return MODE_HSYNC_WIDE;
78
79 if ((mode->hdisplay < 1) || (mode->htotal < 1))
80 return MODE_H_ILLEGAL;
81
82 if ((mode->hdisplay > 0x7ff) || (mode->htotal > 0xfff))
83 return MODE_BAD_HVALUE;
84
85 DRM_DEBUG_DRIVER("Horizontal parameters OK\n");
86
87 if (vsync < 1)
88 return MODE_VSYNC_NARROW;
89
90 if (vsync > 0x3ff)
91 return MODE_VSYNC_WIDE;
92
93 if ((mode->vdisplay < 1) || (mode->vtotal < 1))
94 return MODE_V_ILLEGAL;
95
96 if ((mode->vdisplay > 0x7ff) || (mode->vtotal > 0xfff))
97 return MODE_BAD_VVALUE;
98
99 DRM_DEBUG_DRIVER("Vertical parameters OK\n");
100
101
102
103
104
105
106
107 if (rgb->panel) {
108 DRM_DEBUG_DRIVER("RGB panel used, skipping clock rate checks");
109 goto out;
110 }
111
112
113
114
115
116 if (!rgb->bridge)
117 goto out;
118
119 tcon->dclk_min_div = 6;
120 tcon->dclk_max_div = 127;
121 rounded_rate = clk_round_rate(tcon->dclk, rate);
122
123 lowest = rate * (1000 - SUN4I_RGB_DOTCLOCK_TOLERANCE_PER_MILLE);
124 do_div(lowest, 1000);
125 if (rounded_rate < lowest)
126 return MODE_CLOCK_LOW;
127
128 highest = rate * (1000 + SUN4I_RGB_DOTCLOCK_TOLERANCE_PER_MILLE);
129 do_div(highest, 1000);
130 if (rounded_rate > highest)
131 return MODE_CLOCK_HIGH;
132
133out:
134 DRM_DEBUG_DRIVER("Clock rate OK\n");
135
136 return MODE_OK;
137}
138
139static struct drm_connector_helper_funcs sun4i_rgb_con_helper_funcs = {
140 .get_modes = sun4i_rgb_get_modes,
141};
142
143static void
144sun4i_rgb_connector_destroy(struct drm_connector *connector)
145{
146 struct sun4i_rgb *rgb = drm_connector_to_sun4i_rgb(connector);
147
148 drm_panel_detach(rgb->panel);
149 drm_connector_cleanup(connector);
150}
151
152static const struct drm_connector_funcs sun4i_rgb_con_funcs = {
153 .fill_modes = drm_helper_probe_single_connector_modes,
154 .destroy = sun4i_rgb_connector_destroy,
155 .reset = drm_atomic_helper_connector_reset,
156 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
157 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
158};
159
160static void sun4i_rgb_encoder_enable(struct drm_encoder *encoder)
161{
162 struct sun4i_rgb *rgb = drm_encoder_to_sun4i_rgb(encoder);
163
164 DRM_DEBUG_DRIVER("Enabling RGB output\n");
165
166 if (rgb->panel) {
167 drm_panel_prepare(rgb->panel);
168 drm_panel_enable(rgb->panel);
169 }
170}
171
172static void sun4i_rgb_encoder_disable(struct drm_encoder *encoder)
173{
174 struct sun4i_rgb *rgb = drm_encoder_to_sun4i_rgb(encoder);
175
176 DRM_DEBUG_DRIVER("Disabling RGB output\n");
177
178 if (rgb->panel) {
179 drm_panel_disable(rgb->panel);
180 drm_panel_unprepare(rgb->panel);
181 }
182}
183
184static struct drm_encoder_helper_funcs sun4i_rgb_enc_helper_funcs = {
185 .disable = sun4i_rgb_encoder_disable,
186 .enable = sun4i_rgb_encoder_enable,
187 .mode_valid = sun4i_rgb_mode_valid,
188};
189
190static void sun4i_rgb_enc_destroy(struct drm_encoder *encoder)
191{
192 drm_encoder_cleanup(encoder);
193}
194
195static struct drm_encoder_funcs sun4i_rgb_enc_funcs = {
196 .destroy = sun4i_rgb_enc_destroy,
197};
198
199int sun4i_rgb_init(struct drm_device *drm, struct sun4i_tcon *tcon)
200{
201 struct drm_encoder *encoder;
202 struct sun4i_rgb *rgb;
203 int ret;
204
205 rgb = devm_kzalloc(drm->dev, sizeof(*rgb), GFP_KERNEL);
206 if (!rgb)
207 return -ENOMEM;
208 rgb->tcon = tcon;
209 encoder = &rgb->encoder;
210
211 ret = drm_of_find_panel_or_bridge(tcon->dev->of_node, 1, 0,
212 &rgb->panel, &rgb->bridge);
213 if (ret) {
214 dev_info(drm->dev, "No panel or bridge found... RGB output disabled\n");
215 return 0;
216 }
217
218 drm_encoder_helper_add(&rgb->encoder,
219 &sun4i_rgb_enc_helper_funcs);
220 ret = drm_encoder_init(drm,
221 &rgb->encoder,
222 &sun4i_rgb_enc_funcs,
223 DRM_MODE_ENCODER_NONE,
224 NULL);
225 if (ret) {
226 dev_err(drm->dev, "Couldn't initialise the rgb encoder\n");
227 goto err_out;
228 }
229
230
231 rgb->encoder.possible_crtcs = drm_crtc_mask(&tcon->crtc->crtc);
232
233 if (rgb->panel) {
234 drm_connector_helper_add(&rgb->connector,
235 &sun4i_rgb_con_helper_funcs);
236 ret = drm_connector_init(drm, &rgb->connector,
237 &sun4i_rgb_con_funcs,
238 DRM_MODE_CONNECTOR_Unknown);
239 if (ret) {
240 dev_err(drm->dev, "Couldn't initialise the rgb connector\n");
241 goto err_cleanup_connector;
242 }
243
244 drm_connector_attach_encoder(&rgb->connector,
245 &rgb->encoder);
246
247 ret = drm_panel_attach(rgb->panel, &rgb->connector);
248 if (ret) {
249 dev_err(drm->dev, "Couldn't attach our panel\n");
250 goto err_cleanup_connector;
251 }
252 }
253
254 if (rgb->bridge) {
255 ret = drm_bridge_attach(encoder, rgb->bridge, NULL);
256 if (ret) {
257 dev_err(drm->dev, "Couldn't attach our bridge\n");
258 goto err_cleanup_connector;
259 }
260 }
261
262 return 0;
263
264err_cleanup_connector:
265 drm_encoder_cleanup(&rgb->encoder);
266err_out:
267 return ret;
268}
269EXPORT_SYMBOL(sun4i_rgb_init);
270
