1 // SPDX-License-Identifier: MIT 2 3 #include <drm/clients/drm_client_setup.h> 4 #include <drm/drm_device.h> 5 #include <drm/drm_fourcc.h> 6 #include <drm/drm_print.h> 7 8 #include "drm_client_internal.h" 9 10 static char drm_client_default[16] = CONFIG_DRM_CLIENT_DEFAULT; 11 module_param_string(active, drm_client_default, sizeof(drm_client_default), 0444); 12 MODULE_PARM_DESC(active, 13 "Choose which drm client to start, default is" 14 CONFIG_DRM_CLIENT_DEFAULT "]"); 15 16 /** 17 * drm_client_setup() - Setup in-kernel DRM clients 18 * @dev: DRM device 19 * @format: Preferred pixel format for the device. Use NULL, unless 20 * there is clearly a driver-preferred format. 21 * 22 * This function sets up the in-kernel DRM clients. Restore, hotplug 23 * events and teardown are all taken care of. 24 * 25 * Drivers should call drm_client_setup() after registering the new 26 * DRM device with drm_dev_register(). This function is safe to call 27 * even when there are no connectors present. Setup will be retried 28 * on the next hotplug event. 29 * 30 * The clients are destroyed by drm_dev_unregister(). 31 */ 32 void drm_client_setup(struct drm_device *dev, const struct drm_format_info *format) 33 { 34 35 #ifdef CONFIG_DRM_FBDEV_EMULATION 36 if (!strcmp(drm_client_default, "fbdev")) { 37 int ret; 38 39 ret = drm_fbdev_client_setup(dev, format); 40 if (ret) 41 drm_warn(dev, "Failed to set up DRM client; error %d\n", ret); 42 return; 43 } 44 #endif 45 46 #ifdef CONFIG_DRM_CLIENT_LOG 47 if (!strcmp(drm_client_default, "log")) { 48 drm_log_register(dev); 49 return; 50 } 51 #endif 52 if (strcmp(drm_client_default, "")) 53 drm_warn(dev, "Unknown DRM client %s\n", drm_client_default); 54 } 55 EXPORT_SYMBOL(drm_client_setup); 56 57 /** 58 * drm_client_setup_with_fourcc() - Setup in-kernel DRM clients for color mode 59 * @dev: DRM device 60 * @fourcc: Preferred pixel format as 4CC code for the device 61 * 62 * This function sets up the in-kernel DRM clients. It is equivalent 63 * to drm_client_setup(), but expects a 4CC code as second argument. 64 */ 65 void drm_client_setup_with_fourcc(struct drm_device *dev, u32 fourcc) 66 { 67 drm_client_setup(dev, drm_format_info(fourcc)); 68 } 69 EXPORT_SYMBOL(drm_client_setup_with_fourcc); 70 71 /** 72 * drm_client_setup_with_color_mode() - Setup in-kernel DRM clients for color mode 73 * @dev: DRM device 74 * @color_mode: Preferred color mode for the device 75 * 76 * This function sets up the in-kernel DRM clients. It is equivalent 77 * to drm_client_setup(), but expects a color mode as second argument. 78 * 79 * Do not use this function in new drivers. Prefer drm_client_setup() with a 80 * format of NULL. 81 */ 82 void drm_client_setup_with_color_mode(struct drm_device *dev, unsigned int color_mode) 83 { 84 u32 fourcc = drm_driver_color_mode_format(dev, color_mode); 85 86 drm_client_setup_with_fourcc(dev, fourcc); 87 } 88 EXPORT_SYMBOL(drm_client_setup_with_color_mode); 89 90 MODULE_DESCRIPTION("In-kernel DRM clients"); 91 MODULE_LICENSE("GPL and additional rights"); 92