1 // SPDX-License-Identifier: MIT 2 3 #include <linux/export.h> 4 5 #include <drm/clients/drm_client_setup.h> 6 #include <drm/drm_device.h> 7 #include <drm/drm_fourcc.h> 8 #include <drm/drm_print.h> 9 10 #include "drm_client_internal.h" 11 12 static char drm_client_default[16] = CONFIG_DRM_CLIENT_DEFAULT; 13 module_param_string(active, drm_client_default, sizeof(drm_client_default), 0444); 14 MODULE_PARM_DESC(active, 15 "Choose which drm client to start, default is" 16 CONFIG_DRM_CLIENT_DEFAULT "]"); 17 18 /** 19 * drm_client_setup() - Setup in-kernel DRM clients 20 * @dev: DRM device 21 * @format: Preferred pixel format for the device. Use NULL, unless 22 * there is clearly a driver-preferred format. 23 * 24 * This function sets up the in-kernel DRM clients. Restore, hotplug 25 * events and teardown are all taken care of. 26 * 27 * Drivers should call drm_client_setup() after registering the new 28 * DRM device with drm_dev_register(). This function is safe to call 29 * even when there are no connectors present. Setup will be retried 30 * on the next hotplug event. 31 * 32 * The clients are destroyed by drm_dev_unregister(). 33 */ 34 void drm_client_setup(struct drm_device *dev, const struct drm_format_info *format) 35 { 36 37 #ifdef CONFIG_DRM_FBDEV_EMULATION 38 if (!strcmp(drm_client_default, "fbdev")) { 39 int ret; 40 41 ret = drm_fbdev_client_setup(dev, format); 42 if (ret) 43 drm_warn(dev, "Failed to set up DRM client; error %d\n", ret); 44 return; 45 } 46 #endif 47 48 #ifdef CONFIG_DRM_CLIENT_LOG 49 if (!strcmp(drm_client_default, "log")) { 50 drm_log_register(dev); 51 return; 52 } 53 #endif 54 if (strcmp(drm_client_default, "")) 55 drm_warn(dev, "Unknown DRM client %s\n", drm_client_default); 56 } 57 EXPORT_SYMBOL(drm_client_setup); 58 59 /** 60 * drm_client_setup_with_fourcc() - Setup in-kernel DRM clients for color mode 61 * @dev: DRM device 62 * @fourcc: Preferred pixel format as 4CC code for the device 63 * 64 * This function sets up the in-kernel DRM clients. It is equivalent 65 * to drm_client_setup(), but expects a 4CC code as second argument. 66 */ 67 void drm_client_setup_with_fourcc(struct drm_device *dev, u32 fourcc) 68 { 69 drm_client_setup(dev, drm_format_info(fourcc)); 70 } 71 EXPORT_SYMBOL(drm_client_setup_with_fourcc); 72 73 /** 74 * drm_client_setup_with_color_mode() - Setup in-kernel DRM clients for color mode 75 * @dev: DRM device 76 * @color_mode: Preferred color mode for the device 77 * 78 * This function sets up the in-kernel DRM clients. It is equivalent 79 * to drm_client_setup(), but expects a color mode as second argument. 80 * 81 * Do not use this function in new drivers. Prefer drm_client_setup() with a 82 * format of NULL. 83 */ 84 void drm_client_setup_with_color_mode(struct drm_device *dev, unsigned int color_mode) 85 { 86 u32 fourcc = drm_driver_color_mode_format(dev, color_mode); 87 88 drm_client_setup_with_fourcc(dev, fourcc); 89 } 90 EXPORT_SYMBOL(drm_client_setup_with_color_mode); 91 92 MODULE_DESCRIPTION("In-kernel DRM clients"); 93 MODULE_LICENSE("GPL and additional rights"); 94