1 /* 2 * Copyright (C) 2012 Avionic Design GmbH 3 * Copyright (C) 2012 NVIDIA CORPORATION. All rights reserved. 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License version 2 as 7 * published by the Free Software Foundation. 8 */ 9 10 #include <linux/clk.h> 11 12 #include <drm/drm_atomic_helper.h> 13 #include <drm/drm_panel.h> 14 15 #include "drm.h" 16 #include "dc.h" 17 18 struct tegra_rgb { 19 struct tegra_output output; 20 struct tegra_dc *dc; 21 22 struct clk *clk_parent; 23 struct clk *clk; 24 }; 25 26 static inline struct tegra_rgb *to_rgb(struct tegra_output *output) 27 { 28 return container_of(output, struct tegra_rgb, output); 29 } 30 31 struct reg_entry { 32 unsigned long offset; 33 unsigned long value; 34 }; 35 36 static const struct reg_entry rgb_enable[] = { 37 { DC_COM_PIN_OUTPUT_ENABLE(0), 0x00000000 }, 38 { DC_COM_PIN_OUTPUT_ENABLE(1), 0x00000000 }, 39 { DC_COM_PIN_OUTPUT_ENABLE(2), 0x00000000 }, 40 { DC_COM_PIN_OUTPUT_ENABLE(3), 0x00000000 }, 41 { DC_COM_PIN_OUTPUT_POLARITY(0), 0x00000000 }, 42 { DC_COM_PIN_OUTPUT_POLARITY(1), 0x01000000 }, 43 { DC_COM_PIN_OUTPUT_POLARITY(2), 0x00000000 }, 44 { DC_COM_PIN_OUTPUT_POLARITY(3), 0x00000000 }, 45 { DC_COM_PIN_OUTPUT_DATA(0), 0x00000000 }, 46 { DC_COM_PIN_OUTPUT_DATA(1), 0x00000000 }, 47 { DC_COM_PIN_OUTPUT_DATA(2), 0x00000000 }, 48 { DC_COM_PIN_OUTPUT_DATA(3), 0x00000000 }, 49 { DC_COM_PIN_OUTPUT_SELECT(0), 0x00000000 }, 50 { DC_COM_PIN_OUTPUT_SELECT(1), 0x00000000 }, 51 { DC_COM_PIN_OUTPUT_SELECT(2), 0x00000000 }, 52 { DC_COM_PIN_OUTPUT_SELECT(3), 0x00000000 }, 53 { DC_COM_PIN_OUTPUT_SELECT(4), 0x00210222 }, 54 { DC_COM_PIN_OUTPUT_SELECT(5), 0x00002200 }, 55 { DC_COM_PIN_OUTPUT_SELECT(6), 0x00020000 }, 56 }; 57 58 static const struct reg_entry rgb_disable[] = { 59 { DC_COM_PIN_OUTPUT_SELECT(6), 0x00000000 }, 60 { DC_COM_PIN_OUTPUT_SELECT(5), 0x00000000 }, 61 { DC_COM_PIN_OUTPUT_SELECT(4), 0x00000000 }, 62 { DC_COM_PIN_OUTPUT_SELECT(3), 0x00000000 }, 63 { DC_COM_PIN_OUTPUT_SELECT(2), 0x00000000 }, 64 { DC_COM_PIN_OUTPUT_SELECT(1), 0x00000000 }, 65 { DC_COM_PIN_OUTPUT_SELECT(0), 0x00000000 }, 66 { DC_COM_PIN_OUTPUT_DATA(3), 0xaaaaaaaa }, 67 { DC_COM_PIN_OUTPUT_DATA(2), 0xaaaaaaaa }, 68 { DC_COM_PIN_OUTPUT_DATA(1), 0xaaaaaaaa }, 69 { DC_COM_PIN_OUTPUT_DATA(0), 0xaaaaaaaa }, 70 { DC_COM_PIN_OUTPUT_POLARITY(3), 0x00000000 }, 71 { DC_COM_PIN_OUTPUT_POLARITY(2), 0x00000000 }, 72 { DC_COM_PIN_OUTPUT_POLARITY(1), 0x00000000 }, 73 { DC_COM_PIN_OUTPUT_POLARITY(0), 0x00000000 }, 74 { DC_COM_PIN_OUTPUT_ENABLE(3), 0x55555555 }, 75 { DC_COM_PIN_OUTPUT_ENABLE(2), 0x55555555 }, 76 { DC_COM_PIN_OUTPUT_ENABLE(1), 0x55150005 }, 77 { DC_COM_PIN_OUTPUT_ENABLE(0), 0x55555555 }, 78 }; 79 80 static void tegra_dc_write_regs(struct tegra_dc *dc, 81 const struct reg_entry *table, 82 unsigned int num) 83 { 84 unsigned int i; 85 86 for (i = 0; i < num; i++) 87 tegra_dc_writel(dc, table[i].value, table[i].offset); 88 } 89 90 static const struct drm_connector_funcs tegra_rgb_connector_funcs = { 91 .reset = drm_atomic_helper_connector_reset, 92 .detect = tegra_output_connector_detect, 93 .fill_modes = drm_helper_probe_single_connector_modes, 94 .destroy = tegra_output_connector_destroy, 95 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, 96 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, 97 }; 98 99 static enum drm_mode_status 100 tegra_rgb_connector_mode_valid(struct drm_connector *connector, 101 struct drm_display_mode *mode) 102 { 103 /* 104 * FIXME: For now, always assume that the mode is okay. There are 105 * unresolved issues with clk_round_rate(), which doesn't always 106 * reliably report whether a frequency can be set or not. 107 */ 108 return MODE_OK; 109 } 110 111 static const struct drm_connector_helper_funcs tegra_rgb_connector_helper_funcs = { 112 .get_modes = tegra_output_connector_get_modes, 113 .mode_valid = tegra_rgb_connector_mode_valid, 114 }; 115 116 static const struct drm_encoder_funcs tegra_rgb_encoder_funcs = { 117 .destroy = tegra_output_encoder_destroy, 118 }; 119 120 static void tegra_rgb_encoder_disable(struct drm_encoder *encoder) 121 { 122 struct tegra_output *output = encoder_to_output(encoder); 123 struct tegra_rgb *rgb = to_rgb(output); 124 125 if (output->panel) 126 drm_panel_disable(output->panel); 127 128 tegra_dc_write_regs(rgb->dc, rgb_disable, ARRAY_SIZE(rgb_disable)); 129 tegra_dc_commit(rgb->dc); 130 131 if (output->panel) 132 drm_panel_unprepare(output->panel); 133 } 134 135 static void tegra_rgb_encoder_enable(struct drm_encoder *encoder) 136 { 137 struct tegra_output *output = encoder_to_output(encoder); 138 struct tegra_rgb *rgb = to_rgb(output); 139 u32 value; 140 141 if (output->panel) 142 drm_panel_prepare(output->panel); 143 144 tegra_dc_write_regs(rgb->dc, rgb_enable, ARRAY_SIZE(rgb_enable)); 145 146 value = DE_SELECT_ACTIVE | DE_CONTROL_NORMAL; 147 tegra_dc_writel(rgb->dc, value, DC_DISP_DATA_ENABLE_OPTIONS); 148 149 /* XXX: parameterize? */ 150 value = tegra_dc_readl(rgb->dc, DC_COM_PIN_OUTPUT_POLARITY(1)); 151 value &= ~LVS_OUTPUT_POLARITY_LOW; 152 value &= ~LHS_OUTPUT_POLARITY_LOW; 153 tegra_dc_writel(rgb->dc, value, DC_COM_PIN_OUTPUT_POLARITY(1)); 154 155 /* XXX: parameterize? */ 156 value = DISP_DATA_FORMAT_DF1P1C | DISP_ALIGNMENT_MSB | 157 DISP_ORDER_RED_BLUE; 158 tegra_dc_writel(rgb->dc, value, DC_DISP_DISP_INTERFACE_CONTROL); 159 160 /* XXX: parameterize? */ 161 value = SC0_H_QUALIFIER_NONE | SC1_H_QUALIFIER_NONE; 162 tegra_dc_writel(rgb->dc, value, DC_DISP_SHIFT_CLOCK_OPTIONS); 163 164 tegra_dc_commit(rgb->dc); 165 166 if (output->panel) 167 drm_panel_enable(output->panel); 168 } 169 170 static int 171 tegra_rgb_encoder_atomic_check(struct drm_encoder *encoder, 172 struct drm_crtc_state *crtc_state, 173 struct drm_connector_state *conn_state) 174 { 175 struct tegra_output *output = encoder_to_output(encoder); 176 struct tegra_dc *dc = to_tegra_dc(conn_state->crtc); 177 unsigned long pclk = crtc_state->mode.clock * 1000; 178 struct tegra_rgb *rgb = to_rgb(output); 179 unsigned int div; 180 int err; 181 182 /* 183 * We may not want to change the frequency of the parent clock, since 184 * it may be a parent for other peripherals. This is due to the fact 185 * that on Tegra20 there's only a single clock dedicated to display 186 * (pll_d_out0), whereas later generations have a second one that can 187 * be used to independently drive a second output (pll_d2_out0). 188 * 189 * As a way to support multiple outputs on Tegra20 as well, pll_p is 190 * typically used as the parent clock for the display controllers. 191 * But this comes at a cost: pll_p is the parent of several other 192 * peripherals, so its frequency shouldn't change out of the blue. 193 * 194 * The best we can do at this point is to use the shift clock divider 195 * and hope that the desired frequency can be matched (or at least 196 * matched sufficiently close that the panel will still work). 197 */ 198 div = ((clk_get_rate(rgb->clk) * 2) / pclk) - 2; 199 pclk = 0; 200 201 err = tegra_dc_state_setup_clock(dc, crtc_state, rgb->clk_parent, 202 pclk, div); 203 if (err < 0) { 204 dev_err(output->dev, "failed to setup CRTC state: %d\n", err); 205 return err; 206 } 207 208 return err; 209 } 210 211 static const struct drm_encoder_helper_funcs tegra_rgb_encoder_helper_funcs = { 212 .disable = tegra_rgb_encoder_disable, 213 .enable = tegra_rgb_encoder_enable, 214 .atomic_check = tegra_rgb_encoder_atomic_check, 215 }; 216 217 int tegra_dc_rgb_probe(struct tegra_dc *dc) 218 { 219 struct device_node *np; 220 struct tegra_rgb *rgb; 221 int err; 222 223 np = of_get_child_by_name(dc->dev->of_node, "rgb"); 224 if (!np || !of_device_is_available(np)) 225 return -ENODEV; 226 227 rgb = devm_kzalloc(dc->dev, sizeof(*rgb), GFP_KERNEL); 228 if (!rgb) 229 return -ENOMEM; 230 231 rgb->output.dev = dc->dev; 232 rgb->output.of_node = np; 233 rgb->dc = dc; 234 235 err = tegra_output_probe(&rgb->output); 236 if (err < 0) 237 return err; 238 239 rgb->clk = devm_clk_get(dc->dev, NULL); 240 if (IS_ERR(rgb->clk)) { 241 dev_err(dc->dev, "failed to get clock\n"); 242 return PTR_ERR(rgb->clk); 243 } 244 245 rgb->clk_parent = devm_clk_get(dc->dev, "parent"); 246 if (IS_ERR(rgb->clk_parent)) { 247 dev_err(dc->dev, "failed to get parent clock\n"); 248 return PTR_ERR(rgb->clk_parent); 249 } 250 251 err = clk_set_parent(rgb->clk, rgb->clk_parent); 252 if (err < 0) { 253 dev_err(dc->dev, "failed to set parent clock: %d\n", err); 254 return err; 255 } 256 257 dc->rgb = &rgb->output; 258 259 return 0; 260 } 261 262 int tegra_dc_rgb_remove(struct tegra_dc *dc) 263 { 264 if (!dc->rgb) 265 return 0; 266 267 tegra_output_remove(dc->rgb); 268 dc->rgb = NULL; 269 270 return 0; 271 } 272 273 int tegra_dc_rgb_init(struct drm_device *drm, struct tegra_dc *dc) 274 { 275 struct tegra_output *output = dc->rgb; 276 int err; 277 278 if (!dc->rgb) 279 return -ENODEV; 280 281 drm_connector_init(drm, &output->connector, &tegra_rgb_connector_funcs, 282 DRM_MODE_CONNECTOR_LVDS); 283 drm_connector_helper_add(&output->connector, 284 &tegra_rgb_connector_helper_funcs); 285 output->connector.dpms = DRM_MODE_DPMS_OFF; 286 287 drm_encoder_init(drm, &output->encoder, &tegra_rgb_encoder_funcs, 288 DRM_MODE_ENCODER_LVDS, NULL); 289 drm_encoder_helper_add(&output->encoder, 290 &tegra_rgb_encoder_helper_funcs); 291 292 drm_connector_attach_encoder(&output->connector, 293 &output->encoder); 294 drm_connector_register(&output->connector); 295 296 err = tegra_output_init(drm, output); 297 if (err < 0) { 298 dev_err(output->dev, "failed to initialize output: %d\n", err); 299 return err; 300 } 301 302 /* 303 * Other outputs can be attached to either display controller. The RGB 304 * outputs are an exception and work only with their parent display 305 * controller. 306 */ 307 output->encoder.possible_crtcs = drm_crtc_mask(&dc->base); 308 309 return 0; 310 } 311 312 int tegra_dc_rgb_exit(struct tegra_dc *dc) 313 { 314 if (dc->rgb) 315 tegra_output_exit(dc->rgb); 316 317 return 0; 318 } 319