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1// SPDX-License-Identifier: GPL-2.0+2 3/*4 * Copyright 2020 NXP5 */6 7#include <linux/firmware/imx/svc/misc.h>8#include <linux/media-bus-format.h>9#include <linux/mfd/syscon.h>10#include <linux/module.h>11#include <linux/of.h>12#include <linux/of_device.h>13#include <linux/of_graph.h>14#include <linux/platform_device.h>15#include <linux/pm_runtime.h>16#include <linux/regmap.h>17 18#include <drm/drm_atomic_state_helper.h>19#include <drm/drm_bridge.h>20#include <drm/drm_of.h>21#include <drm/drm_print.h>22 23#include <dt-bindings/firmware/imx/rsrc.h>24 25#define PXL2DPI_CTRL 0x4026#define CFG1_16BIT 0x027#define CFG2_16BIT 0x128#define CFG3_16BIT 0x229#define CFG1_18BIT 0x330#define CFG2_18BIT 0x431#define CFG_24BIT 0x532 33#define DRIVER_NAME "imx8qxp-pxl2dpi"34 35struct imx8qxp_pxl2dpi {36 struct regmap *regmap;37 struct drm_bridge bridge;38 struct drm_bridge *next_bridge;39 struct drm_bridge *companion;40 struct device *dev;41 struct imx_sc_ipc *ipc_handle;42 u32 sc_resource;43 u32 in_bus_format;44 u32 out_bus_format;45 u32 pl_sel;46};47 48#define bridge_to_p2d(b) container_of(b, struct imx8qxp_pxl2dpi, bridge)49 50static int imx8qxp_pxl2dpi_bridge_attach(struct drm_bridge *bridge,51 enum drm_bridge_attach_flags flags)52{53 struct imx8qxp_pxl2dpi *p2d = bridge->driver_private;54 55 if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) {56 DRM_DEV_ERROR(p2d->dev,57 "do not support creating a drm_connector\n");58 return -EINVAL;59 }60 61 return drm_bridge_attach(bridge->encoder,62 p2d->next_bridge, bridge,63 DRM_BRIDGE_ATTACH_NO_CONNECTOR);64}65 66static int67imx8qxp_pxl2dpi_bridge_atomic_check(struct drm_bridge *bridge,68 struct drm_bridge_state *bridge_state,69 struct drm_crtc_state *crtc_state,70 struct drm_connector_state *conn_state)71{72 struct imx8qxp_pxl2dpi *p2d = bridge->driver_private;73 74 p2d->in_bus_format = bridge_state->input_bus_cfg.format;75 p2d->out_bus_format = bridge_state->output_bus_cfg.format;76 77 return 0;78}79 80static void81imx8qxp_pxl2dpi_bridge_mode_set(struct drm_bridge *bridge,82 const struct drm_display_mode *mode,83 const struct drm_display_mode *adjusted_mode)84{85 struct imx8qxp_pxl2dpi *p2d = bridge->driver_private;86 struct imx8qxp_pxl2dpi *companion_p2d;87 int ret;88 89 ret = pm_runtime_get_sync(p2d->dev);90 if (ret < 0)91 DRM_DEV_ERROR(p2d->dev,92 "failed to get runtime PM sync: %d\n", ret);93 94 ret = imx_sc_misc_set_control(p2d->ipc_handle, p2d->sc_resource,95 IMX_SC_C_PXL_LINK_SEL, p2d->pl_sel);96 if (ret)97 DRM_DEV_ERROR(p2d->dev,98 "failed to set pixel link selection(%u): %d\n",99 p2d->pl_sel, ret);100 101 switch (p2d->out_bus_format) {102 case MEDIA_BUS_FMT_RGB888_1X24:103 regmap_write(p2d->regmap, PXL2DPI_CTRL, CFG_24BIT);104 break;105 case MEDIA_BUS_FMT_RGB666_1X24_CPADHI:106 regmap_write(p2d->regmap, PXL2DPI_CTRL, CFG2_18BIT);107 break;108 default:109 DRM_DEV_ERROR(p2d->dev,110 "unsupported output bus format 0x%08x\n",111 p2d->out_bus_format);112 }113 114 if (p2d->companion) {115 companion_p2d = bridge_to_p2d(p2d->companion);116 117 companion_p2d->in_bus_format = p2d->in_bus_format;118 companion_p2d->out_bus_format = p2d->out_bus_format;119 120 p2d->companion->funcs->mode_set(p2d->companion, mode,121 adjusted_mode);122 }123}124 125static void126imx8qxp_pxl2dpi_bridge_atomic_disable(struct drm_bridge *bridge,127 struct drm_bridge_state *old_bridge_state)128{129 struct imx8qxp_pxl2dpi *p2d = bridge->driver_private;130 int ret;131 132 ret = pm_runtime_put(p2d->dev);133 if (ret < 0)134 DRM_DEV_ERROR(p2d->dev, "failed to put runtime PM: %d\n", ret);135 136 if (p2d->companion)137 p2d->companion->funcs->atomic_disable(p2d->companion,138 old_bridge_state);139}140 141static const u32 imx8qxp_pxl2dpi_bus_output_fmts[] = {142 MEDIA_BUS_FMT_RGB888_1X24,143 MEDIA_BUS_FMT_RGB666_1X24_CPADHI,144};145 146static bool imx8qxp_pxl2dpi_bus_output_fmt_supported(u32 fmt)147{148 int i;149 150 for (i = 0; i < ARRAY_SIZE(imx8qxp_pxl2dpi_bus_output_fmts); i++) {151 if (imx8qxp_pxl2dpi_bus_output_fmts[i] == fmt)152 return true;153 }154 155 return false;156}157 158static u32 *159imx8qxp_pxl2dpi_bridge_atomic_get_input_bus_fmts(struct drm_bridge *bridge,160 struct drm_bridge_state *bridge_state,161 struct drm_crtc_state *crtc_state,162 struct drm_connector_state *conn_state,163 u32 output_fmt,164 unsigned int *num_input_fmts)165{166 u32 *input_fmts;167 168 if (!imx8qxp_pxl2dpi_bus_output_fmt_supported(output_fmt))169 return NULL;170 171 *num_input_fmts = 1;172 173 input_fmts = kmalloc(sizeof(*input_fmts), GFP_KERNEL);174 if (!input_fmts)175 return NULL;176 177 switch (output_fmt) {178 case MEDIA_BUS_FMT_RGB888_1X24:179 input_fmts[0] = MEDIA_BUS_FMT_RGB888_1X36_CPADLO;180 break;181 case MEDIA_BUS_FMT_RGB666_1X24_CPADHI:182 input_fmts[0] = MEDIA_BUS_FMT_RGB666_1X36_CPADLO;183 break;184 default:185 kfree(input_fmts);186 input_fmts = NULL;187 break;188 }189 190 return input_fmts;191}192 193static u32 *194imx8qxp_pxl2dpi_bridge_atomic_get_output_bus_fmts(struct drm_bridge *bridge,195 struct drm_bridge_state *bridge_state,196 struct drm_crtc_state *crtc_state,197 struct drm_connector_state *conn_state,198 unsigned int *num_output_fmts)199{200 *num_output_fmts = ARRAY_SIZE(imx8qxp_pxl2dpi_bus_output_fmts);201 return kmemdup(imx8qxp_pxl2dpi_bus_output_fmts,202 sizeof(imx8qxp_pxl2dpi_bus_output_fmts), GFP_KERNEL);203}204 205static const struct drm_bridge_funcs imx8qxp_pxl2dpi_bridge_funcs = {206 .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,207 .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,208 .atomic_reset = drm_atomic_helper_bridge_reset,209 .attach = imx8qxp_pxl2dpi_bridge_attach,210 .atomic_check = imx8qxp_pxl2dpi_bridge_atomic_check,211 .mode_set = imx8qxp_pxl2dpi_bridge_mode_set,212 .atomic_disable = imx8qxp_pxl2dpi_bridge_atomic_disable,213 .atomic_get_input_bus_fmts =214 imx8qxp_pxl2dpi_bridge_atomic_get_input_bus_fmts,215 .atomic_get_output_bus_fmts =216 imx8qxp_pxl2dpi_bridge_atomic_get_output_bus_fmts,217};218 219static struct device_node *220imx8qxp_pxl2dpi_get_available_ep_from_port(struct imx8qxp_pxl2dpi *p2d,221 u32 port_id)222{223 struct device_node *port, *ep;224 int ep_cnt;225 226 port = of_graph_get_port_by_id(p2d->dev->of_node, port_id);227 if (!port) {228 DRM_DEV_ERROR(p2d->dev, "failed to get port@%u\n", port_id);229 return ERR_PTR(-ENODEV);230 }231 232 ep_cnt = of_get_available_child_count(port);233 if (ep_cnt == 0) {234 DRM_DEV_ERROR(p2d->dev, "no available endpoints of port@%u\n",235 port_id);236 ep = ERR_PTR(-ENODEV);237 goto out;238 } else if (ep_cnt > 1) {239 DRM_DEV_ERROR(p2d->dev,240 "invalid available endpoints of port@%u\n",241 port_id);242 ep = ERR_PTR(-EINVAL);243 goto out;244 }245 246 ep = of_get_next_available_child(port, NULL);247 if (!ep) {248 DRM_DEV_ERROR(p2d->dev,249 "failed to get available endpoint of port@%u\n",250 port_id);251 ep = ERR_PTR(-ENODEV);252 goto out;253 }254out:255 of_node_put(port);256 return ep;257}258 259static struct drm_bridge *260imx8qxp_pxl2dpi_find_next_bridge(struct imx8qxp_pxl2dpi *p2d)261{262 struct device_node *ep, *remote;263 struct drm_bridge *next_bridge;264 int ret;265 266 ep = imx8qxp_pxl2dpi_get_available_ep_from_port(p2d, 1);267 if (IS_ERR(ep)) {268 ret = PTR_ERR(ep);269 return ERR_PTR(ret);270 }271 272 remote = of_graph_get_remote_port_parent(ep);273 if (!remote || !of_device_is_available(remote)) {274 DRM_DEV_ERROR(p2d->dev, "no available remote\n");275 next_bridge = ERR_PTR(-ENODEV);276 goto out;277 } else if (!of_device_is_available(remote->parent)) {278 DRM_DEV_ERROR(p2d->dev, "remote parent is not available\n");279 next_bridge = ERR_PTR(-ENODEV);280 goto out;281 }282 283 next_bridge = of_drm_find_bridge(remote);284 if (!next_bridge) {285 next_bridge = ERR_PTR(-EPROBE_DEFER);286 goto out;287 }288out:289 of_node_put(remote);290 of_node_put(ep);291 292 return next_bridge;293}294 295static int imx8qxp_pxl2dpi_set_pixel_link_sel(struct imx8qxp_pxl2dpi *p2d)296{297 struct device_node *ep;298 struct of_endpoint endpoint;299 int ret;300 301 ep = imx8qxp_pxl2dpi_get_available_ep_from_port(p2d, 0);302 if (IS_ERR(ep))303 return PTR_ERR(ep);304 305 ret = of_graph_parse_endpoint(ep, &endpoint);306 if (ret) {307 DRM_DEV_ERROR(p2d->dev,308 "failed to parse endpoint of port@0: %d\n", ret);309 goto out;310 }311 312 p2d->pl_sel = endpoint.id;313out:314 of_node_put(ep);315 316 return ret;317}318 319static int imx8qxp_pxl2dpi_parse_dt_companion(struct imx8qxp_pxl2dpi *p2d)320{321 struct imx8qxp_pxl2dpi *companion_p2d;322 struct device *dev = p2d->dev;323 struct device_node *companion;324 struct device_node *port1, *port2;325 const struct of_device_id *match;326 int dual_link;327 int ret = 0;328 329 /* Locate the companion PXL2DPI for dual-link operation, if any. */330 companion = of_parse_phandle(dev->of_node, "fsl,companion-pxl2dpi", 0);331 if (!companion)332 return 0;333 334 if (!of_device_is_available(companion)) {335 DRM_DEV_ERROR(dev, "companion PXL2DPI is not available\n");336 ret = -ENODEV;337 goto out;338 }339 340 /*341 * Sanity check: the companion bridge must have the same compatible342 * string.343 */344 match = of_match_device(dev->driver->of_match_table, dev);345 if (!of_device_is_compatible(companion, match->compatible)) {346 DRM_DEV_ERROR(dev, "companion PXL2DPI is incompatible\n");347 ret = -ENXIO;348 goto out;349 }350 351 p2d->companion = of_drm_find_bridge(companion);352 if (!p2d->companion) {353 ret = -EPROBE_DEFER;354 DRM_DEV_DEBUG_DRIVER(p2d->dev,355 "failed to find companion bridge: %d\n",356 ret);357 goto out;358 }359 360 companion_p2d = bridge_to_p2d(p2d->companion);361 362 /*363 * We need to work out if the sink is expecting us to function in364 * dual-link mode. We do this by looking at the DT port nodes that365 * the next bridges are connected to. If they are marked as expecting366 * even pixels and odd pixels than we need to use the companion PXL2DPI.367 */368 port1 = of_graph_get_port_by_id(p2d->next_bridge->of_node, 1);369 port2 = of_graph_get_port_by_id(companion_p2d->next_bridge->of_node, 1);370 dual_link = drm_of_lvds_get_dual_link_pixel_order(port1, port2);371 of_node_put(port1);372 of_node_put(port2);373 374 if (dual_link < 0) {375 ret = dual_link;376 DRM_DEV_ERROR(dev, "failed to get dual link pixel order: %d\n",377 ret);378 goto out;379 }380 381 DRM_DEV_DEBUG_DRIVER(dev,382 "dual-link configuration detected (companion bridge %pOF)\n",383 companion);384out:385 of_node_put(companion);386 return ret;387}388 389static int imx8qxp_pxl2dpi_bridge_probe(struct platform_device *pdev)390{391 struct imx8qxp_pxl2dpi *p2d;392 struct device *dev = &pdev->dev;393 struct device_node *np = dev->of_node;394 int ret;395 396 p2d = devm_kzalloc(dev, sizeof(*p2d), GFP_KERNEL);397 if (!p2d)398 return -ENOMEM;399 400 p2d->regmap = syscon_node_to_regmap(np->parent);401 if (IS_ERR(p2d->regmap)) {402 ret = PTR_ERR(p2d->regmap);403 if (ret != -EPROBE_DEFER)404 DRM_DEV_ERROR(dev, "failed to get regmap: %d\n", ret);405 return ret;406 }407 408 ret = imx_scu_get_handle(&p2d->ipc_handle);409 if (ret) {410 if (ret != -EPROBE_DEFER)411 DRM_DEV_ERROR(dev, "failed to get SCU ipc handle: %d\n",412 ret);413 return ret;414 }415 416 p2d->dev = dev;417 418 ret = of_property_read_u32(np, "fsl,sc-resource", &p2d->sc_resource);419 if (ret) {420 DRM_DEV_ERROR(dev, "failed to get SC resource %d\n", ret);421 return ret;422 }423 424 p2d->next_bridge = imx8qxp_pxl2dpi_find_next_bridge(p2d);425 if (IS_ERR(p2d->next_bridge)) {426 ret = PTR_ERR(p2d->next_bridge);427 if (ret != -EPROBE_DEFER)428 DRM_DEV_ERROR(dev, "failed to find next bridge: %d\n",429 ret);430 return ret;431 }432 433 ret = imx8qxp_pxl2dpi_set_pixel_link_sel(p2d);434 if (ret)435 return ret;436 437 ret = imx8qxp_pxl2dpi_parse_dt_companion(p2d);438 if (ret)439 return ret;440 441 platform_set_drvdata(pdev, p2d);442 pm_runtime_enable(dev);443 444 p2d->bridge.driver_private = p2d;445 p2d->bridge.funcs = &imx8qxp_pxl2dpi_bridge_funcs;446 p2d->bridge.of_node = np;447 448 drm_bridge_add(&p2d->bridge);449 450 return ret;451}452 453static void imx8qxp_pxl2dpi_bridge_remove(struct platform_device *pdev)454{455 struct imx8qxp_pxl2dpi *p2d = platform_get_drvdata(pdev);456 457 drm_bridge_remove(&p2d->bridge);458 459 pm_runtime_disable(&pdev->dev);460}461 462static const struct of_device_id imx8qxp_pxl2dpi_dt_ids[] = {463 { .compatible = "fsl,imx8qxp-pxl2dpi", },464 { /* sentinel */ }465};466MODULE_DEVICE_TABLE(of, imx8qxp_pxl2dpi_dt_ids);467 468static struct platform_driver imx8qxp_pxl2dpi_bridge_driver = {469 .probe = imx8qxp_pxl2dpi_bridge_probe,470 .remove_new = imx8qxp_pxl2dpi_bridge_remove,471 .driver = {472 .of_match_table = imx8qxp_pxl2dpi_dt_ids,473 .name = DRIVER_NAME,474 },475};476module_platform_driver(imx8qxp_pxl2dpi_bridge_driver);477 478MODULE_DESCRIPTION("i.MX8QXP pixel link to DPI bridge driver");479MODULE_AUTHOR("Liu Ying <victor.liu@nxp.com>");480MODULE_LICENSE("GPL v2");481MODULE_ALIAS("platform:" DRIVER_NAME);482