1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright (C) 2021 BayLibre, SAS 4 * Author: Neil Armstrong <narmstrong@baylibre.com> 5 * Copyright (C) 2015 Amlogic, Inc. All rights reserved. 6 */ 7 8 #include <linux/clk.h> 9 #include <linux/kernel.h> 10 #include <linux/mod_devicetable.h> 11 #include <linux/module.h> 12 #include <linux/of_graph.h> 13 #include <linux/platform_device.h> 14 #include <linux/reset.h> 15 #include <linux/phy/phy.h> 16 #include <linux/bitfield.h> 17 18 #include <video/mipi_display.h> 19 20 #include <drm/bridge/dw_mipi_dsi.h> 21 #include <drm/drm_mipi_dsi.h> 22 23 #include <drm/drm_atomic_helper.h> 24 #include <drm/drm_device.h> 25 #include <drm/drm_probe_helper.h> 26 #include <drm/drm_print.h> 27 28 #include "meson_drv.h" 29 #include "meson_dw_mipi_dsi.h" 30 #include "meson_registers.h" 31 #include "meson_venc.h" 32 33 #define DRIVER_NAME "meson-dw-mipi-dsi" 34 #define DRIVER_DESC "Amlogic Meson MIPI-DSI DRM driver" 35 36 struct meson_dw_mipi_dsi { 37 struct meson_drm *priv; 38 struct device *dev; 39 void __iomem *base; 40 struct phy *phy; 41 union phy_configure_opts phy_opts; 42 struct dw_mipi_dsi *dmd; 43 struct dw_mipi_dsi_plat_data pdata; 44 struct mipi_dsi_device *dsi_device; 45 const struct drm_display_mode *mode; 46 struct clk *bit_clk; 47 struct clk *px_clk; 48 struct reset_control *top_rst; 49 }; 50 51 #define encoder_to_meson_dw_mipi_dsi(x) \ 52 container_of(x, struct meson_dw_mipi_dsi, encoder) 53 54 static void meson_dw_mipi_dsi_hw_init(struct meson_dw_mipi_dsi *mipi_dsi) 55 { 56 /* Software reset */ 57 writel_bits_relaxed(MIPI_DSI_TOP_SW_RESET_DWC | MIPI_DSI_TOP_SW_RESET_INTR | 58 MIPI_DSI_TOP_SW_RESET_DPI | MIPI_DSI_TOP_SW_RESET_TIMING, 59 MIPI_DSI_TOP_SW_RESET_DWC | MIPI_DSI_TOP_SW_RESET_INTR | 60 MIPI_DSI_TOP_SW_RESET_DPI | MIPI_DSI_TOP_SW_RESET_TIMING, 61 mipi_dsi->base + MIPI_DSI_TOP_SW_RESET); 62 writel_bits_relaxed(MIPI_DSI_TOP_SW_RESET_DWC | MIPI_DSI_TOP_SW_RESET_INTR | 63 MIPI_DSI_TOP_SW_RESET_DPI | MIPI_DSI_TOP_SW_RESET_TIMING, 64 0, mipi_dsi->base + MIPI_DSI_TOP_SW_RESET); 65 66 /* Enable clocks */ 67 writel_bits_relaxed(MIPI_DSI_TOP_CLK_SYSCLK_EN | MIPI_DSI_TOP_CLK_PIXCLK_EN, 68 MIPI_DSI_TOP_CLK_SYSCLK_EN | MIPI_DSI_TOP_CLK_PIXCLK_EN, 69 mipi_dsi->base + MIPI_DSI_TOP_CLK_CNTL); 70 71 /* Take memory out of power down */ 72 writel_relaxed(0, mipi_dsi->base + MIPI_DSI_TOP_MEM_PD); 73 } 74 75 static int dw_mipi_dsi_phy_init(void *priv_data) 76 { 77 struct meson_dw_mipi_dsi *mipi_dsi = priv_data; 78 unsigned int dpi_data_format, venc_data_width; 79 int ret; 80 81 /* Set the bit clock rate to hs_clk_rate */ 82 ret = clk_set_rate(mipi_dsi->bit_clk, 83 mipi_dsi->phy_opts.mipi_dphy.hs_clk_rate); 84 if (ret) { 85 dev_err(mipi_dsi->dev, "Failed to set DSI Bit clock rate %lu (ret %d)\n", 86 mipi_dsi->phy_opts.mipi_dphy.hs_clk_rate, ret); 87 return ret; 88 } 89 90 /* Make sure the rate of the bit clock is not modified by someone else */ 91 ret = clk_rate_exclusive_get(mipi_dsi->bit_clk); 92 if (ret) { 93 dev_err(mipi_dsi->dev, 94 "Failed to set the exclusivity on the bit clock rate (ret %d)\n", ret); 95 return ret; 96 } 97 98 ret = clk_set_rate(mipi_dsi->px_clk, mipi_dsi->mode->clock * 1000); 99 100 if (ret) { 101 dev_err(mipi_dsi->dev, "Failed to set DSI Pixel clock rate %u (%d)\n", 102 mipi_dsi->mode->clock * 1000, ret); 103 return ret; 104 } 105 106 switch (mipi_dsi->dsi_device->format) { 107 case MIPI_DSI_FMT_RGB888: 108 dpi_data_format = DPI_COLOR_24BIT; 109 venc_data_width = VENC_IN_COLOR_24B; 110 break; 111 case MIPI_DSI_FMT_RGB666: 112 dpi_data_format = DPI_COLOR_18BIT_CFG_2; 113 venc_data_width = VENC_IN_COLOR_18B; 114 break; 115 case MIPI_DSI_FMT_RGB666_PACKED: 116 case MIPI_DSI_FMT_RGB565: 117 return -EINVAL; 118 } 119 120 /* Configure color format for DPI register */ 121 writel_relaxed(FIELD_PREP(MIPI_DSI_TOP_DPI_COLOR_MODE, dpi_data_format) | 122 FIELD_PREP(MIPI_DSI_TOP_IN_COLOR_MODE, venc_data_width) | 123 FIELD_PREP(MIPI_DSI_TOP_COMP2_SEL, 2) | 124 FIELD_PREP(MIPI_DSI_TOP_COMP1_SEL, 1) | 125 FIELD_PREP(MIPI_DSI_TOP_COMP0_SEL, 0), 126 mipi_dsi->base + MIPI_DSI_TOP_CNTL); 127 128 return phy_configure(mipi_dsi->phy, &mipi_dsi->phy_opts); 129 } 130 131 static void dw_mipi_dsi_phy_power_on(void *priv_data) 132 { 133 struct meson_dw_mipi_dsi *mipi_dsi = priv_data; 134 135 if (phy_power_on(mipi_dsi->phy)) 136 dev_warn(mipi_dsi->dev, "Failed to power on PHY\n"); 137 } 138 139 static void dw_mipi_dsi_phy_power_off(void *priv_data) 140 { 141 struct meson_dw_mipi_dsi *mipi_dsi = priv_data; 142 143 if (phy_power_off(mipi_dsi->phy)) 144 dev_warn(mipi_dsi->dev, "Failed to power off PHY\n"); 145 146 /* Remove the exclusivity on the bit clock rate */ 147 clk_rate_exclusive_put(mipi_dsi->bit_clk); 148 } 149 150 static int 151 dw_mipi_dsi_get_lane_mbps(void *priv_data, const struct drm_display_mode *mode, 152 unsigned long mode_flags, u32 lanes, u32 format, 153 unsigned int *lane_mbps) 154 { 155 struct meson_dw_mipi_dsi *mipi_dsi = priv_data; 156 int bpp; 157 158 mipi_dsi->mode = mode; 159 160 bpp = mipi_dsi_pixel_format_to_bpp(mipi_dsi->dsi_device->format); 161 162 phy_mipi_dphy_get_default_config(mode->clock * 1000, 163 bpp, mipi_dsi->dsi_device->lanes, 164 &mipi_dsi->phy_opts.mipi_dphy); 165 166 *lane_mbps = DIV_ROUND_UP(mipi_dsi->phy_opts.mipi_dphy.hs_clk_rate, USEC_PER_SEC); 167 168 return 0; 169 } 170 171 static int 172 dw_mipi_dsi_phy_get_timing(void *priv_data, unsigned int lane_mbps, 173 struct dw_mipi_dsi_dphy_timing *timing) 174 { 175 struct meson_dw_mipi_dsi *mipi_dsi = priv_data; 176 177 switch (mipi_dsi->mode->hdisplay) { 178 case 240: 179 case 768: 180 case 1920: 181 case 2560: 182 timing->clk_lp2hs = 23; 183 timing->clk_hs2lp = 38; 184 timing->data_lp2hs = 15; 185 timing->data_hs2lp = 9; 186 break; 187 188 default: 189 timing->clk_lp2hs = 37; 190 timing->clk_hs2lp = 135; 191 timing->data_lp2hs = 50; 192 timing->data_hs2lp = 3; 193 } 194 195 return 0; 196 } 197 198 static int 199 dw_mipi_dsi_get_esc_clk_rate(void *priv_data, unsigned int *esc_clk_rate) 200 { 201 *esc_clk_rate = 4; /* Mhz */ 202 203 return 0; 204 } 205 206 static const struct dw_mipi_dsi_phy_ops meson_dw_mipi_dsi_phy_ops = { 207 .init = dw_mipi_dsi_phy_init, 208 .power_on = dw_mipi_dsi_phy_power_on, 209 .power_off = dw_mipi_dsi_phy_power_off, 210 .get_lane_mbps = dw_mipi_dsi_get_lane_mbps, 211 .get_timing = dw_mipi_dsi_phy_get_timing, 212 .get_esc_clk_rate = dw_mipi_dsi_get_esc_clk_rate, 213 }; 214 215 static int meson_dw_mipi_dsi_host_attach(void *priv_data, 216 struct mipi_dsi_device *device) 217 { 218 struct meson_dw_mipi_dsi *mipi_dsi = priv_data; 219 int ret; 220 221 mipi_dsi->dsi_device = device; 222 223 switch (device->format) { 224 case MIPI_DSI_FMT_RGB888: 225 break; 226 case MIPI_DSI_FMT_RGB666: 227 break; 228 case MIPI_DSI_FMT_RGB666_PACKED: 229 case MIPI_DSI_FMT_RGB565: 230 dev_err(mipi_dsi->dev, "invalid pixel format %d\n", device->format); 231 return -EINVAL; 232 } 233 234 ret = phy_init(mipi_dsi->phy); 235 if (ret) 236 return ret; 237 238 meson_dw_mipi_dsi_hw_init(mipi_dsi); 239 240 return 0; 241 } 242 243 static int meson_dw_mipi_dsi_host_detach(void *priv_data, 244 struct mipi_dsi_device *device) 245 { 246 struct meson_dw_mipi_dsi *mipi_dsi = priv_data; 247 248 if (device == mipi_dsi->dsi_device) 249 mipi_dsi->dsi_device = NULL; 250 else 251 return -EINVAL; 252 253 return phy_exit(mipi_dsi->phy); 254 } 255 256 static const struct dw_mipi_dsi_host_ops meson_dw_mipi_dsi_host_ops = { 257 .attach = meson_dw_mipi_dsi_host_attach, 258 .detach = meson_dw_mipi_dsi_host_detach, 259 }; 260 261 static int meson_dw_mipi_dsi_probe(struct platform_device *pdev) 262 { 263 struct meson_dw_mipi_dsi *mipi_dsi; 264 struct device *dev = &pdev->dev; 265 266 mipi_dsi = devm_kzalloc(dev, sizeof(*mipi_dsi), GFP_KERNEL); 267 if (!mipi_dsi) 268 return -ENOMEM; 269 270 mipi_dsi->base = devm_platform_ioremap_resource(pdev, 0); 271 if (IS_ERR(mipi_dsi->base)) 272 return PTR_ERR(mipi_dsi->base); 273 274 mipi_dsi->phy = devm_phy_get(dev, "dphy"); 275 if (IS_ERR(mipi_dsi->phy)) 276 return dev_err_probe(dev, PTR_ERR(mipi_dsi->phy), 277 "failed to get mipi dphy\n"); 278 279 mipi_dsi->bit_clk = devm_clk_get_enabled(dev, "bit"); 280 if (IS_ERR(mipi_dsi->bit_clk)) { 281 int ret = PTR_ERR(mipi_dsi->bit_clk); 282 283 /* TOFIX GP0 on some platforms fails to lock in early boot, defer probe */ 284 if (ret == -EIO) 285 ret = -EPROBE_DEFER; 286 287 return dev_err_probe(dev, ret, "Unable to get enabled bit_clk\n"); 288 } 289 290 mipi_dsi->px_clk = devm_clk_get_enabled(dev, "px"); 291 if (IS_ERR(mipi_dsi->px_clk)) 292 return dev_err_probe(dev, PTR_ERR(mipi_dsi->px_clk), 293 "Unable to get enabled px_clk\n"); 294 295 /* 296 * We use a TOP reset signal because the APB reset signal 297 * is handled by the TOP control registers. 298 */ 299 mipi_dsi->top_rst = devm_reset_control_get_exclusive(dev, "top"); 300 if (IS_ERR(mipi_dsi->top_rst)) 301 return dev_err_probe(dev, PTR_ERR(mipi_dsi->top_rst), 302 "Unable to get reset control\n"); 303 304 reset_control_assert(mipi_dsi->top_rst); 305 usleep_range(10, 20); 306 reset_control_deassert(mipi_dsi->top_rst); 307 308 /* MIPI DSI Controller */ 309 310 mipi_dsi->dev = dev; 311 mipi_dsi->pdata.base = mipi_dsi->base; 312 mipi_dsi->pdata.max_data_lanes = 4; 313 mipi_dsi->pdata.phy_ops = &meson_dw_mipi_dsi_phy_ops; 314 mipi_dsi->pdata.host_ops = &meson_dw_mipi_dsi_host_ops; 315 mipi_dsi->pdata.priv_data = mipi_dsi; 316 platform_set_drvdata(pdev, mipi_dsi); 317 318 mipi_dsi->dmd = dw_mipi_dsi_probe(pdev, &mipi_dsi->pdata); 319 if (IS_ERR(mipi_dsi->dmd)) 320 return dev_err_probe(dev, PTR_ERR(mipi_dsi->dmd), 321 "Failed to probe dw_mipi_dsi\n"); 322 323 return 0; 324 } 325 326 static int meson_dw_mipi_dsi_remove(struct platform_device *pdev) 327 { 328 struct meson_dw_mipi_dsi *mipi_dsi = platform_get_drvdata(pdev); 329 330 dw_mipi_dsi_remove(mipi_dsi->dmd); 331 332 return 0; 333 } 334 335 static const struct of_device_id meson_dw_mipi_dsi_of_table[] = { 336 { .compatible = "amlogic,meson-g12a-dw-mipi-dsi", }, 337 { } 338 }; 339 MODULE_DEVICE_TABLE(of, meson_dw_mipi_dsi_of_table); 340 341 static struct platform_driver meson_dw_mipi_dsi_platform_driver = { 342 .probe = meson_dw_mipi_dsi_probe, 343 .remove = meson_dw_mipi_dsi_remove, 344 .driver = { 345 .name = DRIVER_NAME, 346 .of_match_table = meson_dw_mipi_dsi_of_table, 347 }, 348 }; 349 module_platform_driver(meson_dw_mipi_dsi_platform_driver); 350 351 MODULE_AUTHOR("Neil Armstrong <narmstrong@baylibre.com>"); 352 MODULE_DESCRIPTION(DRIVER_DESC); 353 MODULE_LICENSE("GPL"); 354