1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Copyright (C) 2015 Free Electrons
4 * Copyright (C) 2015 NextThing Co
6 * Maxime Ripard <maxime.ripard@free-electrons.com>
11 #include <drm/drm_atomic_helper.h>
12 #include <drm/drm_bridge.h>
13 #include <drm/drm_of.h>
14 #include <drm/drm_panel.h>
15 #include <drm/drm_print.h>
16 #include <drm/drm_probe_helper.h>
18 #include "sun4i_crtc.h"
19 #include "sun4i_tcon.h"
20 #include "sun4i_rgb.h"
23 struct drm_connector connector;
24 struct drm_encoder encoder;
26 struct sun4i_tcon *tcon;
27 struct drm_panel *panel;
28 struct drm_bridge *bridge;
31 static inline struct sun4i_rgb *
32 drm_connector_to_sun4i_rgb(struct drm_connector *connector)
34 return container_of(connector, struct sun4i_rgb,
38 static inline struct sun4i_rgb *
39 drm_encoder_to_sun4i_rgb(struct drm_encoder *encoder)
41 return container_of(encoder, struct sun4i_rgb,
45 static int sun4i_rgb_get_modes(struct drm_connector *connector)
47 struct sun4i_rgb *rgb =
48 drm_connector_to_sun4i_rgb(connector);
50 return drm_panel_get_modes(rgb->panel);
54 * VESA DMT defines a tolerance of 0.5% on the pixel clock, while the
55 * CVT spec reuses that tolerance in its examples, so it looks to be a
56 * good default tolerance for the EDID-based modes. Define it to 5 per
57 * mille to avoid floating point operations.
59 #define SUN4I_RGB_DOTCLOCK_TOLERANCE_PER_MILLE 5
61 static enum drm_mode_status sun4i_rgb_mode_valid(struct drm_encoder *crtc,
62 const struct drm_display_mode *mode)
64 struct sun4i_rgb *rgb = drm_encoder_to_sun4i_rgb(crtc);
65 struct sun4i_tcon *tcon = rgb->tcon;
66 u32 hsync = mode->hsync_end - mode->hsync_start;
67 u32 vsync = mode->vsync_end - mode->vsync_start;
68 unsigned long long rate = mode->clock * 1000;
69 unsigned long long lowest, highest;
70 unsigned long long rounded_rate;
72 DRM_DEBUG_DRIVER("Validating modes...\n");
75 return MODE_HSYNC_NARROW;
78 return MODE_HSYNC_WIDE;
80 if ((mode->hdisplay < 1) || (mode->htotal < 1))
81 return MODE_H_ILLEGAL;
83 if ((mode->hdisplay > 0x7ff) || (mode->htotal > 0xfff))
84 return MODE_BAD_HVALUE;
86 DRM_DEBUG_DRIVER("Horizontal parameters OK\n");
89 return MODE_VSYNC_NARROW;
92 return MODE_VSYNC_WIDE;
94 if ((mode->vdisplay < 1) || (mode->vtotal < 1))
95 return MODE_V_ILLEGAL;
97 if ((mode->vdisplay > 0x7ff) || (mode->vtotal > 0xfff))
98 return MODE_BAD_VVALUE;
100 DRM_DEBUG_DRIVER("Vertical parameters OK\n");
103 * TODO: We should use the struct display_timing if available
104 * and / or trying to stretch the timings within that
105 * tolerancy to take care of panels that we wouldn't be able
106 * to have a exact match for.
109 DRM_DEBUG_DRIVER("RGB panel used, skipping clock rate checks");
114 * That shouldn't ever happen unless something is really wrong, but it
115 * doesn't harm to check.
120 tcon->dclk_min_div = 6;
121 tcon->dclk_max_div = 127;
122 rounded_rate = clk_round_rate(tcon->dclk, rate);
124 lowest = rate * (1000 - SUN4I_RGB_DOTCLOCK_TOLERANCE_PER_MILLE);
125 do_div(lowest, 1000);
126 if (rounded_rate < lowest)
127 return MODE_CLOCK_LOW;
129 highest = rate * (1000 + SUN4I_RGB_DOTCLOCK_TOLERANCE_PER_MILLE);
130 do_div(highest, 1000);
131 if (rounded_rate > highest)
132 return MODE_CLOCK_HIGH;
135 DRM_DEBUG_DRIVER("Clock rate OK\n");
140 static struct drm_connector_helper_funcs sun4i_rgb_con_helper_funcs = {
141 .get_modes = sun4i_rgb_get_modes,
145 sun4i_rgb_connector_destroy(struct drm_connector *connector)
147 struct sun4i_rgb *rgb = drm_connector_to_sun4i_rgb(connector);
149 drm_panel_detach(rgb->panel);
150 drm_connector_cleanup(connector);
153 static const struct drm_connector_funcs sun4i_rgb_con_funcs = {
154 .fill_modes = drm_helper_probe_single_connector_modes,
155 .destroy = sun4i_rgb_connector_destroy,
156 .reset = drm_atomic_helper_connector_reset,
157 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
158 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
161 static void sun4i_rgb_encoder_enable(struct drm_encoder *encoder)
163 struct sun4i_rgb *rgb = drm_encoder_to_sun4i_rgb(encoder);
165 DRM_DEBUG_DRIVER("Enabling RGB output\n");
168 drm_panel_prepare(rgb->panel);
169 drm_panel_enable(rgb->panel);
173 static void sun4i_rgb_encoder_disable(struct drm_encoder *encoder)
175 struct sun4i_rgb *rgb = drm_encoder_to_sun4i_rgb(encoder);
177 DRM_DEBUG_DRIVER("Disabling RGB output\n");
180 drm_panel_disable(rgb->panel);
181 drm_panel_unprepare(rgb->panel);
185 static struct drm_encoder_helper_funcs sun4i_rgb_enc_helper_funcs = {
186 .disable = sun4i_rgb_encoder_disable,
187 .enable = sun4i_rgb_encoder_enable,
188 .mode_valid = sun4i_rgb_mode_valid,
191 static void sun4i_rgb_enc_destroy(struct drm_encoder *encoder)
193 drm_encoder_cleanup(encoder);
196 static struct drm_encoder_funcs sun4i_rgb_enc_funcs = {
197 .destroy = sun4i_rgb_enc_destroy,
200 int sun4i_rgb_init(struct drm_device *drm, struct sun4i_tcon *tcon)
202 struct drm_encoder *encoder;
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 &rgb->panel, &rgb->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 = drm_crtc_mask(&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_connector_attach_encoder(&rgb->connector,
248 ret = drm_panel_attach(rgb->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, rgb->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);