1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright (C) 2015 Free Electrons 4 * Copyright (C) 2015 NextThing Co 5 * 6 * Maxime Ripard <maxime.ripard@free-electrons.com> 7 */ 8 9 #include <linux/clk.h> 10 11 #include <drm/drm_atomic_helper.h> 12 #include <drm/drm_of.h> 13 #include <drm/drm_panel.h> 14 #include <drm/drm_print.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 21 struct 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 30 static inline struct sun4i_rgb * 31 drm_connector_to_sun4i_rgb(struct drm_connector *connector) 32 { 33 return container_of(connector, struct sun4i_rgb, 34 connector); 35 } 36 37 static inline struct sun4i_rgb * 38 drm_encoder_to_sun4i_rgb(struct drm_encoder *encoder) 39 { 40 return container_of(encoder, struct sun4i_rgb, 41 encoder); 42 } 43 44 static 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 * VESA DMT defines a tolerance of 0.5% on the pixel clock, while the 54 * CVT spec reuses that tolerance in its examples, so it looks to be a 55 * good default tolerance for the EDID-based modes. Define it to 5 per 56 * mille to avoid floating point operations. 57 */ 58 #define SUN4I_RGB_DOTCLOCK_TOLERANCE_PER_MILLE 5 59 60 static 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 * TODO: We should use the struct display_timing if available 103 * and / or trying to stretch the timings within that 104 * tolerancy to take care of panels that we wouldn't be able 105 * to have a exact match for. 106 */ 107 if (rgb->panel) { 108 DRM_DEBUG_DRIVER("RGB panel used, skipping clock rate checks"); 109 goto out; 110 } 111 112 /* 113 * That shouldn't ever happen unless something is really wrong, but it 114 * doesn't harm to check. 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; 132 133 out: 134 DRM_DEBUG_DRIVER("Clock rate OK\n"); 135 136 return MODE_OK; 137 } 138 139 static struct drm_connector_helper_funcs sun4i_rgb_con_helper_funcs = { 140 .get_modes = sun4i_rgb_get_modes, 141 }; 142 143 static void 144 sun4i_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 } 151 152 static 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 }; 159 160 static 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 } 171 172 static 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 } 183 184 static 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 }; 189 190 static void sun4i_rgb_enc_destroy(struct drm_encoder *encoder) 191 { 192 drm_encoder_cleanup(encoder); 193 } 194 195 static struct drm_encoder_funcs sun4i_rgb_enc_funcs = { 196 .destroy = sun4i_rgb_enc_destroy, 197 }; 198 199 int 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 /* The RGB encoder can only work with the TCON channel 0 */ 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; 263 264 err_cleanup_connector: 265 drm_encoder_cleanup(&rgb->encoder); 266 err_out: 267 return ret; 268 } 269 EXPORT_SYMBOL(sun4i_rgb_init); 270